05 Beam Dynamics and Electromagnetic Fields
D01 Beam Optics - Lattices, Correction Schemes, Transport

Paper	Title	Page
MOPAB049	Development of a Focusing System for the AXSIS Project	203
	T. Vinatier, R.W. Aßmann, U. Dorda, B. Marchetti DESY, Hamburg, Germany
	In this paper, we investigate with ASTRA simulations the achievable performances for several focusing systems considered in the AXSIS project. We focus our attention on the requirements in terms of position of the focal point and bunch transverse size at this point. We show that they cannot be fulfilled with a solenoid resistive electro-magnet, but that it is possible when using a solenoid permanent magnet. The use of a quadrupole doublet proves to be adequate to fulfil the requirement on the position of the focal point and be very close to the one on the bunch transverse size, which could possibly be achieved by a further optimization of the parameters of the doublet. Finally, we also investigate the possibility to use an active plasma lens, showing that it could easily fulfil the requirements but that several points must be carefully studied before considering its implementation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB049
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MOPAB099	Design Study of Drift Tube Linac for BNCT Accelerator	359
SUSPSIK046	use link to see paper's listing under its alternate paper code
	Y. Lee, S.W. Jang, E.-S. Kim Korea University Sejong Campus, Sejong, Republic of Korea B.H. Choi IBS, Daejeon, Republic of Korea D.S. Kim Dawonsys, Siheung-City, Republic of Korea Z. Li SCU, Chengdu, People's Republic of China
	A-BNCT accelerator is being developed as a proton accelerator with a high beam current of 50 mA for effective cancer therapy. Drift tube linac (DTL) with the length of 4.5 m is composed of 1 tank and 48 drift tubes (DTs). Proton beam is accelerated from 3 MeV to 10 MeV. Electromagnetic quadrupoles (EMQs) are inserted into every DT for transverse focusing. Slug tuners and post couplers (PCs) are used for accelerating field stabilization and resonant frequency tuning, respectively. The beam dynamics and engineering design for the DTL are performed for effective beam acceleration, and the design results are in detail presented.
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MOPAB102	Fast Orbit Response Matrix Measurements at ALBA	365
	Z. Martí, G. Benedetti, M. Carlà, J. Fraxanet, U. Iriso, J. Moldes, A. Olmos, R. Petrocelli ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	At ALBA the standard orbit response matrix measurement with DC corrector magnet (CM) modulation is being upgraded with an AC excitation of the correctors combined with the synchronized beam position monitor (BPM) acquisition data rate at 10 kHz. Several types of excitation waveforms (sinusoidal vs square types) and frequencies have been tested and compared to optimize the measurement precision and repeatability. The data acquisition time of the ALBA response matrix (88 horizontal and 88 vertical correctors) with the new AC method takes 1 minute to complete instead of 7 minutes of the standard technique.
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MOPIK030	Design of a Beamline From a TR24 Cyclotron for Biological Tissues Irradiation	564
	E. Bouquerel, T. Adam, G. Heitz, C. Maazouzi, C. Matthieu, M. Pellicioli, M. Rousseau, C. Ruescas, J. Schuler, E.K. Traykov IPHC, Strasbourg Cedex 2, France
	Funding: The PRECy project is supported by the Contrat de Projet Etat-Région (CPER) Alsace Champagne-Ardenne Lorraine. The PRECy project foresees the use of a 16-25 MeV energy proton beam produced by the recently installed TR24 cyclotron, CYRCé, at the Institut Pluridisciplinaire Hubert Curien (IPHC) of Strasbourg for biological tissues irradiation. One of the exit ports of the cyclotron will be used for this application along with a combination magnet. The platform will consist of up to 3 or 5 experimental stations linked to beamlines in a dedicated area next to the cyclotron vault. One of the beamlines will receive proton beams of a few cm diameter at intensities up to 100 nA. The status of the design of this first beam line is presented.
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MOPIK050	Reduction of Resonant Slow Extraction Losses with Shadowing of Septum Wires by a Bent Crystal	631
	F.M. Velotti, M.A. Fraser, B. Goddard, V. Kain, W. Scandale, L.S. Stoel CERN, Geneva, Switzerland
	A new experiment, SHiP, is being studied at CERN to investigate the existence of three Heavy Neutral Leptons in order to give experimental proof to the proposed neutrino minimal Standard Model. High-intensity slow-extraction of protons from the SPS is a pre-requisite for SHiP. The experiment requires a resonant extraction with in a 7.2 s cycle, and about 4·1013 protons extracted at 400 GeV in a 1 s flat-top, to achieve the needed 2·1020 protons on target in five years. Although the SPS has delivered this in the past to the CNGS experiment with fast extraction, for SHiP beam losses and activation of the SPS electrostatic extraction septum (ZS) could be a serious performance limitation, since the target number of protons to resonantly extract per year is a factor of two higher than ever achieved before and a factor of four than ever reached with the third-integer slow extraction. In this paper, a novel extraction technique to significantly reduce the losses at the ZS is proposed, based on the use of a bent crystal to shadow the septum wires. Theoretical concepts are developed, the performance gain quantified and a possible layout proposed.
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MOPIK054	Towards the Low Emittance CANDLE Storage Ring	641
	A. Sargsyan, G.A. Amatuni, V. Sahakyan, V.M. Tsakanov, G.S. Zanyan CANDLE SRI, Yerevan, Armenia
	Stimulated by the recent approaches and developments in low emittance lattice design and magnet technology a continuous process of CANDLE storage ring lattice improvement has been launched aiming to keep the project competitive in the field. The main goal of the upgrade program is to bring the beam emittances down to sub-nm level, having the condition of cost and performance efficiency. This paper summarizes the results obtained in the above-mentioned direction. The main design characteristics and linear/nonlinear beam dynamics aspects of the obtained new lattices are presented.
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MOPIK055	Beam by Design: Current Pulse Shaping Through Longitudinal Dispersion Control	644
	T.K. Charles, D.M. Paganin Monash University, Faculty of Science, Clayton, Victoria, Australia M.J. Boland The University of Melbourne, Melbourne, Victoria, Australia M.J. Boland, R.T. Dowd SLSA, Clayton, Australia
	Electron beams traversing a dispersive region, such as a bunch compressor and some transport line can form caustic lines and surfaces corresponding to regions of maximum electron density, which influence the current pulse shape. In this paper, we present a technique to manipulate the longitudinal phase space distribution to achieve an arbitrary, desired current pulse shape. We show how sextupole magnets (and in certain circumstances, octupole magnets), placed within a dispersive region can be used to generate the conditions required for a flexible technique of current pulse shaping that avoids truncation through collimation.
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MOPIK056	On the Ariel Pre-Separator	648
	S. Saminathan, R.A. Baartman TRIUMF, Vancouver, Canada
	Funding: Funded under a contribution agreement with NRC (National Research Council Canada) and Capital funding from CFI (Canada Foundation for Innovation). Two new independent target ion sources with dedicated pre-separators will be built in the ARIEL facility to triple the radioactive ion beam production at TRIUMF. A compact Nier-Johnson type of pre-separator has been designed to achieve a mass resolving power of 300 in order to minimize the undesired radioactive species contaminating the downstream beamlines. It consists of a 112 degree magnetic and a 90 degree toroidal electrostatic dipole with deflection in opposite direction. It also contains electrostatic quadrupole elements in between the dipoles. The electrostatic dipole compensates the energy dispersion of the magnetic dipole. This allows an achromatic mode of operation resulting in a high mass resolving power downstream to the electrostatic deflector even for beams with a high energy spread. We present the result of beam optics calculations for the ARIEL pre-separator.
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MOPIK057	Strategy of Beam Tuning Implementation for the SARAF MEBT and SC Linac	652
	P.A.P. Nghiem, D. Uriot CEA/DSM/IRFU, France B. Dalena, J. Dumas, N. Pichoff CEA/IRFU, Gif-sur-Yvette, France
	Beam dynamics of the MEBT and Superconducting Linac in the SARAF accelerator are being finalized. A strategy for beam tuning implementation is applied to this section, leading to specifying the complete set of error tolerances / beam measurements / correctors. A systematic and precise methodology in several steps is applied, leading to fairly distributing the error budget, from which correction schemes are studied, allowing to determine the necessary beam measurements and correctors.
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MOPIK058	Beam Dynamic Studies for the SARAF MEBT and SC Linac	655
	J. Dumas, N. Pichoff, D. Uriot CEA/IRFU, Gif-sur-Yvette, France P.A.P. Nghiem CEA/DSM/IRFU, France
	The SARAF MEBT and Super Conducting Linac (SCL) transport and accelerate deuterons or protons from the RFQ to the final energy. In this report, beam dynamics studies for this section are described. A rational distribution of the different roles of the MEBT leads to defining its necessary quadrupole/rebuncher composition. This allows easy beam re-tuning following changes from the RFQ or the SC Linac. After observing evidences of beam losses mainly due to phase unhooking, efforts have been dedicated to enlarge the SCL longitudinal acceptance. A combination of cavity field phases is found so that the required final beam energy is also fulfilled.
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MOPIK059	Linear and Nonlinear Optimizations of Combined 7BA-6BA Lattices for the Future Upgrade of SOLEIL	659
	A. Loulergue, P. Brunelle, H.C. Chao, A. Nadji, L.S. Nadolski, R. Nagaoka, M.-A. Tordeux SOLEIL, Gif-sur-Yvette, France
	Previous MBA studies converged to a combination of 7BA and 6BA structures, in terms of the target horizontal emittance of below 300 pm-rad, where the effect of anti-bends, dipole field values, and straight section lengths were investigated. Inspired by the successful lattice designs elsewhere adopting the interleaved sextupole scheme with dispersion bumps originally developed at the ESRF, the 7BA-6BA structures adopting this scheme are studied in details in parallel to those without it. The former aims at the horizontal emittance in the 200-300 pm-rad range with on and off-momentum dynamic acceptances sufficiently large for off-axis injection and good Touschek lifetime. The latter pursues the lower bound of the reachable horizontal emittance with quadrupole and sextupole strengths in the feasible range with maximum dynamic acceptance. The option of non-standard on-axis injection such as displacing the injected beam longitudinally is envisaged for the latter solutions. In both lattices, the numerical search using MOGA-based codes is employed extensively. The studies focus on the impact of linear optics and straight section lengths on the off-momentum and nonlinear properties.
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MOPIK060	Applying MOGA to Search Linear Lattice in Soleil Upgrade Project	662
	H.C. Chao, P. Brunelle, R. Nagaoka SOLEIL, Gif-sur-Yvette, France
	In the community of synchrotron radiation facilities, multi-bend structure becomes the trend of the storage ring design toward lower emittance. For SOLEIL upgrade project, the 7BA-6BA hybrid structure is one of the current options. This paper puts the focus on the 7BA section. There are many degrees of freedom to tweak and many constraints to follow. Here, the idea is to search and build the linear lattice utilizing Multi-Objective Genetic Algorithm (MOGA), which is efficient dealing with higher dimension optimization problems. Within MOGA, subsidiary matchings are performed to ensure certain criteria when the new generation is bred. Delicate designs and manipulations of the objective functions are needed, in order to have a better convergence without being trapped in a local minimum. The results will be shown and discussed.
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MOPIK062	Optics Adaptations for Bending Magnet Beam Lines at ESRF: Short Bend, 2-Pole Wiggler, 3-Pole Wiggler	666
	S.M. Liuzzo, N. Carmignani, J. Chavanne, L. Farvacque, B. Nash, P. Raimondi ESRF, Grenoble, France
	The ESRF-EBS project foresees the replacement of the existing bending magnets beamlines with different radiation sources: short bend, 2-pole wiggler or 3-pole wiggler. After describing the reasons for this choices the required modifications to the storage ring lattice are described in details for each case. The study of the impact of lattice errors is also addressed, leading to the definition of beamlines' alignment tolerances.
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MOPIK063	Non-Linear Kickers Using Eddy Current Screens and Application to the ESRF	670
	S.M. White, M. Dubrulle, L. Farvacque, P. Henrissat, G. Le Bec, E. Plouviez, P. Raimondi, C. Richard ESRF, Grenoble, France
	The ESRF storage ring injection and accumulation is performed using standard 4-kickers bump and septum magnet. Sextupoles are located within the injection bump leading to significant bump non-closure during the ramp-up and ramp-down and optics distorsion for both stored and injected beam. Introducing non-linearities in the kickers allows for compensation of the perturbation from these sextupoles. We report on the feasibility of adding eddy current screens to a standard kicker magnet design to generate a non-linear field and its recent application to mitigate the injection perturbations at the ESRF.
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MOPIK065	Status of the Development of a BE-Model-Based Program for Orbit Correction at the Electron Storage Ring DELTA	673
	S. Koetter, B. Riemann, T. Weis DELTA, Dortmund, Germany
	A new program for orbit correction is currently being developed at the electron storage ring DELTA. Based upon the standard approach of utilizing the linear response of a closed orbit to dipole-field-strength variations, proposed features include a live-updated orbit-response-matrix model and the integration of the Closed-Orbit-Bilinear-Exponential-Analysis algorithm (COBEA) to clean measured orbit-response matrices from noise. This work focuses on the current status of development of the aforementioned program. After an assessment of the situation at DELTA, first measurements are shown along with numerical convergence studies.
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MOPIK066	COBEA - Optical Parameters From Response Matrices without Knowledge of Magnet Strengths	676
	B. Riemann, S. Khan, S. Koetter, T. Weis DELTA, Dortmund, Germany
	This paper presents some results of Closed-Orbit Bilinear-Exponential Analysis (COBEA), an algorithm designed to decompose (coupled) response matrices into betatron tunes and other optical parameters at beam position monitor and corrector positions. The only additional information strictly required by the algorithm is the ordering of monitors and correctors along the storage ring beam path. The presented method is largely lattice-independent, as no magnet strengths or dimensions are needed, and converges in a reasonable time interval due to usage of gradient-based optimization. After describing key features of the algorithm, a set of COBEA results is compared to LOCO results for the storage rings of MLS and BESSY II. The paper is concluded by a brief discussion of further applications, limits and further development of the COBEA algorithm.
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MOPIK067	Figure-8 Storage Ring - Ion Beam Injection into a Closed, Magnetic System	680
	H. Niebuhr, A. Ates, M. Droba, O. Meusel, U. Ratzinger IAP, Frankfurt am Main, Germany
	To store high current low-energetic ion beams of up to 10 A, a superconducting storage ring (F8SR) based on solenoidal and toroidal magnetic guiding fields is investigated at Frankfurt University. Besides simulations, a scaled down experimental setup with normalconducting magnets was built. Investigations of beam injection into closed, magnetic guiding fields are in progress. Therefore, a new kind of injection system consisting of a solenoidal injection coil and a special vacuum vessel was constructed. It is used to inject a hydrogen beam from the side between two toroidal magnets. In parallel operation, a second hydrogen beam is transported through both magnets to represent the circulating beam. The current status of the experimental setup and first experimental results will be shown.
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MOPIK068	Beam Dynamics Design Parameters for KONUS Lattices	683
	R. Tiede, H. Hähnel, U. Ratzinger IAP, Frankfurt am Main, Germany
	The 'Combined Zero-Degree Structure' ('Kombinierte Null Grad Struktur - KONUS') beam dynamics concept has been successfully applied on several linacs, some of them in routine operation since decades. However, the KONUS lattice parameters optimization is often done in a results-oriented approach, depending on the designers' experience. This paper focuses on the description of the longitudinal beam motion along one KONUS lattice period. A test lattice is used for demonstrating the potential of KONUS lattices with respect to stable, periodic beam motion with emittance growth rates similar to those of conventional designs. The main objective of this ongoing work is to derive more general rules for the parametrization of KONUS lattices.
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MOPIK069	Approximate Matrices for Modeling the Focusing of the Undulator Periods and Undulator End Fields	686
	V. Balandin, N. Golubeva DESY, Hamburg, Germany
	We describe procedure for constructing approximate matrices for modeling the focusing of the undulator periods and undulator end fields and discuss applicability of these matrices to the European XFEL undulators.
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MOPIK070	Notes on Relations between Slice and Projected Beam Parameters	689
	V. Balandin, N. Golubeva DESY, Hamburg, Germany
	We consider some aspects of the relations between slice and projected beam parameters.
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MOPIK071	Dispersion and Beam Optic Parameter Measurements in the Transport Line (E-Weg) from DESY II to PETRA III	692
	G.K. Sahoo, K. Balewski, H. Ehrlichmann, J. Keil, R. Wanzenberg DESY, Hamburg, Germany
	The transport line E-Weg extends from the extraction septum in DESY II to the injection septum in PETRA III, and transports electrons at a beam energy of 6.0 GeV. It consists of 3 parts. The first part is in DESY tunnel, the second part is a long drift space in a slanted tube and the third part is in PETRA III tunnel. The vertical plane difference between the tunnels is 1.28 m. The optics was derived from initial values at Transfer Point (UGP) from a previous optics. The total length of the transfer line is about 203 m. Ten screen monitors are used to estimate the profiles of the beam spot for the optics measurements, while 8 BPMs, mostly adjacent to the screens, are used to compare and control the orbits. Two scrapers are installed on either side of the long drift space to trim the beam dimensions in transverse plane. Two FCTs are used to measure the beam current and transfer efficiency. The transverse dispersion and beta functions are measured by extracting the beam from DESY at different energies and analysing the beam profiles at the screen as well as positions at BPMs. The details of such measurements are reported in this paper.
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MOPIK073	Calibration of Linear Optics of COSY Based on ORM Data	699
	C. Weidemann, M. Bai, Y. Dutheil, F. Hinder, B. Lorentz FZJ, Jülich, Germany
	The COoler SYnchrotron in Jülich is a well suited accelerator for a precursor experiment on the direct measurement of the Electric Dipole Moment (EDM) of the deuteron (see* and references within). It provides polarized and unpolarized proton and deuteron beams in the momentum range between 0.3 GeV/c and 3.65 GeV/c**, allows for phase space cooling and is highly flexible with respect to ion-optical settings***. Unfortunately, a model independent linear optics measurement is not possible and so far the existing MAD-X model of COSY does not provide an agreement with the actual machine parameters that is required by future experiments, such as the EDM experiment. Significant deviations with respect to the working point and linear optics have been reported****. As shown in*****, a MAD-X based LOCO (Linear Optics from Closed Orbits) algorithm in a C++ program was successfully developed and carefully benchmarked. This contribution presents the application of the new program on measured ORM data and its capabilities in calibrating linear optics as well as reconstructing machine imperfections such as gradient errors of quadrupole magnets and calibration factors of BPMs and steerers. * D. Eversmann et al., PRL 115, no. 9, 094801 (2015). ** R. Maier, NIM A 390, 1 (1997). *** C. Weidemann et al., PRSTAB 18, 020101 (2015). **** D. Ji et al., IPAC16, doi:10.18429/JACoW-IPAC2016-TUPMR026. ***** C. Weidemann et al., IPAC16, doi:10.18429/JACoW-IPAC2016-THPMB009.
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MOPIK075	Design, Simulation and Compare of Flat Cathode Electron Guns with Spherical Cathode Electron Guns for Industrial Accelerators	702
	M. Nazari, F. Abbasi Shahid Beheshti University, Tehran, Iran S. Ahmadiannamin ILSF, Tehran, Iran F. Ghasemi NSTRI, Tehran, Iran S. Haghtalab IPM, Tehran, Iran
	In this article, electron guns with flat and spherical cathodes have been designed and simulated for industrial accelerators. After checking the different features of each cathode geometry, there has been discussed about optimum values of this features. The most important features in selecting the best cathode geometry for industrial accelerators are beam waist radius, beam waist position, current density and price. Finally after comparing the different features of both geometries with each other, suitable geometry was selected.
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MOPIK076	Optimization of Dynamic Aperture with Constraints on Linear Chromaticity	705
	H. Sugimoto, H. Koiso, A. Morita, Y. Ohnishi, K. Oide, D. Zhou KEK, Ibaraki, Japan
	This paper presents numerical technique to optimize dynamic aperture with constraints on linear chromaticity of optical functions. By solving a set of linear equations at each iteration step of dynamic aperture optimization, the linear chromaticity is kept unchanged. The variable range of tuning knobs is taken into account in order to make the technique applicable to practical use. Numerical simulations assuming the SuperKEKB design lattice are performed, and it is demonstrated that the dynamic aperture obtained with the presented scheme is almost comparable to that without constraints. Luminosity simulations assuming weak-strong model show that the constraints lead to improvements of luminosity performance.
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MOPIK077	Impact of Dynamical Stray Fields on CLIC	708
	E. Marín, D. Schulte CERN, Geneva, Switzerland B. Heilig MFGI, Budapest, Hungary J. Pfingstner University of Oslo, Oslo, Norway
	In this paper we estimate the tolerances of stray-fields variations on the Compact Linear Collider (CLIC), discuss possible sources and propose several solutions. The Beam Delivery System (BDS) is the most sensitive system of CLIC to unwanted magnetic field variations, already variations of 1 nT would reduce the luminosity by 10% at wavelengths comparable to the BDS without considering any correction mechanism. Two sources of magnetic field variations are considered, natural and man-made. Precise magnetic field measurements at Earth's surface under a typical geomagnetic storm are presented. Additionally, stray field measurements have been conducted at CERN, to inspect B-field variations due to technical equipment in an accelerator environment. Different solutions are proposed to minimise the impact of stray fields on the CLIC performance.
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MOPIK079	The Off-Axis Injection Lattice Design of HEPS Storage Ring	716
	Y.M. Peng, D. Ji, Y. Jiao, S.K. Tian, J.Q. Wang, G. Xu IHEP, Beijing, People's Republic of China
	The dynamic aperture size determines the injection scheme to a large extent. The aim of storage ring design of HEPS is to achieve ultralow emittances on both transverse planes. This will bring very strong lattice nonlinearities. The present nominal design is a hybrid 7BA design with effective dynamic aperture of about 3 mm both in horizontal and vertical plane. Due to the restriction of dynamic aperture of this lattice, on-axis injection is the only choice . But, on-axis injection will bring a very big challenge for injector or injection kicker, if it is feasible to obtain a large dynamic aperture, off-axis injection is a favoured choice. In this paper, we will show the preliminary study of the lattice design with a sufficient dynamic aperture for pulsed multipole injection..
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MOPIK080	Research of the Electro-Gravitational Induction by Using COD Signals in Charged Particle Storage Rings	719
	D. Dong IHEP, Beijing, People's Republic of China J.Y. Dong Binghamton University, State University of New York, Binghamton, New York, USA
	Funding: The project was supported by the National Natural Science Foundation of China under Grant No. 11575215, partly. Form the beam instability in the charged particle storage ring; researchers have known that one kinds of long term beam instability, the period of 12 hours, comes from the gravity changes, the change of acceleration of gravity g, delta g caused by the moon and sun moving relative to the earth, so called the terrestrial tidal forces. Phenomenology, we would say that the gravity changes caused by the moon and sun moving at the storage ring have caused the beam energy changes in the storage ring. If it is true, then it may be the electro-gravitational induction (EGI). In this paper, we will discuss the possibility of EGI, and estimate the maximum value of the gravity coefficient of the induced electromotive force by using the existing beam data from the storage rings.
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MOPIK081	Study of HEPS Performance with Error Model and Simulated Correction	721
	D. Ji, Z. Duan, S.K. Tian, Y. Wei IHEP, Beijing, People's Republic of China
	As an important component of physics study on High Energy Photon Source (HEPS), error modelling and simu-lated correction will provide the guideline to restrict the manufacture redundancy of the hardware and estimate the real machine performance. In this paper, we present some work on error effect evaluation and simulated commis-sioning based on a recent lattice design.
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MOPIK082	First Turn Around Strategy for HEPS	724
	Y.L. Zhao, Z. Duan, D. Ji, Y. Jiao, C. Li IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS) is a 6-GeV, kilometer-scale, quasi-diffraction limited storage ring light source to be built in China[1]. Getting the first turn and approaching the closed orbit is very important in accelerator commissioning. In order to make first turn beam commissioning efficiently, we develop a MATLAB tool based on AT for automatic beam correction and closed orbit searching. The algorithm and simulation results are presented in this paper.
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MOPIK085	Linear Optics Calibration at the HLS-II Storage Ring Using Model Independent Analysis	727
	G. Liu, L. Wang, F.F. Wu, K. Xuan USTC/NSRL, Hefei, Anhui, People's Republic of China
	Linear optics are the main lattice parameters characterizing the linear properties of storage rings. Especially for beta function and phase advance, they are the basic lattice functions which must be accurately calibrated to ensure high quality operation of the machine. Model Independent Analysis (MIA), which adopts mathematical statistical methods to extract the effective lattice information of storage rings by directly analyzing the turn-by-turn beam-position-monitor (BPM) measurements, has been applied at HLS-II to calibrate the linear optics model of the storage ring. The measurements of the turn-by-turn BPM data with all of the 32 BPMs are reported in this paper. The calibration results of the beta function using MIA are presented.
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MOPIK087	Development of a Tune Knob for the HLS-II Storage Ring	730
	S.W. Wang, J.Y. Li, W.B. Wu, W. Xu, K. Xuan, X. Zhou USTC/NSRL, Hefei, Anhui, People's Republic of China
	A tune knob is a useful tool for lattice setup and machine studies in a storage ring. It is used to adjust the transverse tunes with a small impact on the beam dynamics. A global tune knob is designed for the Hefei Light Source (HLS). In the tune knob, the quadrupoles are grouped into four families and are symmetrically adjusted. Methodical Accelerator Design-X (MAD-X) is used to calculate the coefficients of the tune knob and the Accelerator Toolbox (AT) is used to double check the accuracy of the tune knob. The chromaticity is corrected by the sextupoles in the storage ring. This paper reports preliminary simulation results of the tune knob for HLS. The beta function deviations are also studied.
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MOPIK088	Vertical Emittance Reduction in the SSRF Phase II Project	733
	C.L. Li, B.C. Jiang, Z.B. Li, M.Z. Zhang, Q.L. Zhang, W.Z. Zhang SINAP, Shanghai, People's Republic of China
	The Shanghai Synchrotron Radiation Facility (SSRF) Phase II beamline project (SSRF Phase II) will implement the new lattice with dual-canted insertion devices, superbends and superconducting wiggler. The emittance coupling is one of the most important parameters for the high brightness storage ring light sources. It is often less than 1% in the third-generation storage ring light sources. In this paper, the sensitivity of emittance coupling to magnetic alignment errors in the SSRF Phase II is presented. Sixty skew quadrupole magnets are utilized to correct the emittance coupling with gradient descent algorithm. The emittance coupling obtained in the SSRF Phase II lattice is below 0.3%.
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MOPIK090	Beta Function Measurement in the SOLARIS Storage Ring	736
	A. Kisiel, M.B. Jaglarz, M.P. Kopeć, S. Piela, M.J. Stankiewicz, A.I. Wawrzyniak Solaris, Kraków, Poland
	One of the most essential lattice function used for transverse beam dynamics studies of the storage rings is a beta function. It characterizes the linear properties of magnets layout and allows to optimize the compatibility of the model and the machine by reducing the beta-beating. Moreover, the calculation of other parameters like transverse beam emittance, dynamic aperture, energy spread and others, requires knowledge of the quantity of beta function along the ring. Various methods of measurement of this function used in Solaris will be presented.
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MOPIK092	Computer Modelling of the SC202 Superconducting Cyclotron for Hadron Therapy	742
	O. Karamyshev, V. Malinin, D.V. Popov JINR/DLNP, Dubna, Moscow region, Russia Y.F. Bi, G. Chen, K.Z. Ding, Y. Song ASIPP, Hefei, People's Republic of China G.A. Karamysheva, N.A. Morozov, E.V. Samsonov, G. Shirkov, S.G. Shirkov JINR, Dubna, Moscow Region, Russia
	The SC202 superconducting cyclotron for hadron therapy is under development by collaboration of ASIPP (Hefei, China) and JINR (Dubna, Russia). The accelerator will provide about 200 MeV proton beam with maximum current of 1μA in 2017-2018. We have performed simulations of all systems of the SC202 cyclotron and specified the main parameters of magnet, acceleration system and extraction elements.
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MOPIK096	Predictability of the Beam Quality During RFQ Voltage Tuning	748
	A. Ponton ESS, Lund, Sweden A.C. France CEA/IRFU, Gif-sur-Yvette, France
	It has previously been demonstrated that certain spatial harmonics of the dipolar and quadrupolar components of the RFQ voltage have stronger effects on the beam quality than others*. The study suggested that, during the tuning process to compensate for manufacturing errors, some harmonic contents (other than the first ones) should be minimized. The analysis presented in this paper looks at how we can predict the beam quality knowing the content of each voltage harmonics. We propose also a strategy to minimize the impacts of the voltage errors on the output beam phase space during the tuning phase. * A. Ponton, A.C. France, Y.I. Levinsen, O. Piquet, B. Pottin, and E. Sargsyan, Voltage Error Studies in the ESS RFQ, in Proc. 7th International Particle Accelerator Conference (IPAC'16), Busan, Korea, May 2016, paper THPMB039, pp. 3320-3323, ISBN: 978-3-95450-147-2
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MOPIK097	Vertical Dispersion and Betatron Coupling Correction for FCC-ee	752
	S. Aumon, B.J. Holzer CERN, Geneva, Switzerland K. Oide KEK, Ibaraki, Japan
	The FCC-ee project foresees to build a 100 km e+/e− circular collider for precision studies and rare decay observations in the range of 90 to 350 GeV center of mass energy with luminosities in the order of 1035 cm-2s-1. To reach such performances, an extreme focusing of the beam is required in the interaction regions with a low vertical beta function of 2~mm at the IPs. Moreover, the FCC-ee physics program requires very low emittances never achieved in a collider with 1~nm for εx and 2~pm for εy, bringing down the coupling ratio to 2/1000. Thus, coupling and vertical dispersion sources have to be controlled carefully. This paper describes the tolerance of the machine to magnet alignment errors as well as the optics correction methods that were implemented, such as the Orbit Dispersion Free Steering, in order to bring the vertical dispersion to reasonable values. The correction of the betatron coupling, being also a very important source of emittance growth, has been integrated to a challenging correction scheme to keep the vertical emittance as low as possible.
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MOPIK099	Tuning-Based Design Optimization of CLIC Final Focus System at 3 TeV	760
SUSPSIK047	use link to see paper's listing under its alternate paper code
	F. Plassard, A. Latina, E. Marín, D. Schulte, R. Tomás CERN, Geneva, Switzerland P. Bambade LAL, Orsay, France
	The tuning aims to mitigate static imperfections of the Final Focus System (FFS) for emittance preservation at the Interaction Point (IP). A simulation campaign on the nominal CLIC FFS at 3 TeV have shown the need of rethink the design in order to ease the tuning of the machine. The goal is to optimize the lattice in order to make the FFS more tolerant to misalignments by reducing the strength of the sextupoles. The tuning efficiency is promoted as figure of merit to find the optimal layout of the FFS. A comparative study of the tuning performances have been performed for two L* options.
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MOPIK100	Beam Delivery System Optimization for CLIC 380 GeV	764
	F. Plassard, A. Latina, E. Marín, D. Schulte, R. Tomás CERN, Geneva, Switzerland P. Bambade LAL, Orsay, France
	In the framework of the CLIC rebaselining, the Beam Delivery System (BDS) have been re-optimized for its initial stage at 380 GeV. Two BDS designs with L*=4.3 meters and L*=6 meters have been investigated. The optimization of the lattices and the beam parameters at the interaction point (IP) have been performed by taking into account their energy upgrade to 3 TeV and the tuning feasibility of the BDS in presence of static imperfections.
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MOPIK102	Beam Dynamics Studies of the HIE-ISOLDE Transfer Lines in the Presence of Magnetic Stray Fields	768
	J. Mertens, J. Bauche, M.A. Fraser, B. Goddard, R. Ostojić, J.S. Schmidt CERN, Geneva, Switzerland
	The ISOLDE facility at CERN produces radioactive isotopes far from stability for fundamental nuclear physics research. The radioactive beams are accelerated to high-energy using a post-accelerator before being transferred for study in different experiments at the end of a network of High Energy Beam Transfer (HEBT) lines. In the framework of the HIE-ISOLDE project, the energy of post-accelerated beams is to be increased to over 10 MeV/u and new experimental detectors are being proposed for installation to exploit the new energy regime. The stray magnetic fields associated with many of the new detectors will distort the beam trajectories in the HEBT, potentially affecting the transmission of the low intensity beams delivered to the experiments. In this contribution, the influence on the HEBT of the stray field of the proposed ISOL Solenoidal Spectrometer is discussed, correction schemes described and shielding options assessed.
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MOPIK104	Top-Up Injection With Anti-Septum	774
	C.H. Gough, M. Aiba PSI, Villigen PSI, Switzerland
	We present a novel improvement for injection into the very restricted machine aperture of future light source synchrotrons. A conventional injection scheme is based on a septum to deflect the injected bunch plus a fast pulsed three or four kicker bump to bring the stored beam close to the septum wall. With the novel improvement, the bump kickers are fitted with a thin wall longitudinal metal plate which screens the injected bunch from deflection without changing the stored beam bump behaviour. This metal screen then forms the final septum, but inverted in function of the conventional approach, hence the name anti-septum. The approach does not remove the need for the main septum magnet, but for modest cost it permits the injected bunch to be brought closer to the stored beam. Application of the anti-septum to the SLS-2 project and simulation results on a prototype are presented.
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MOPIK105	Preliminary Study of Injection Transients in TPS Storage Ring	777
	C.H. Chen, B.Y. Chen, J.Y. Chen, M.-S. Chiu, S. Fann, C.S. Huang, C.-C. Kuo, T.Y. Lee, C.C. Liang, Y.-C. Liu, G.-H. Luo, H.-J. Tsai, F.H. Tseng NSRRC, Hsinchu, Taiwan
	An optimized injection efficiency is related to a perfect match between the pulsed magnetic fields in the storage ring and transfer line extraction in the TPS. However, misalignment errors, hardware output errors and leakage fields are unavoidable. We study the influence of injection transients on the stored TPS beam and discuss solutions to compensate these. Related simulations and measurements will be presented.
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MOPIK106	Effect of Magnetic Element Alignment Errors on Electron Beam Dynamics in the Transportation Channel of the NSC KIPT Neutron Source Driven With Linear Accelerator	781
	A.Y. Zelinsky, P. Gladkikh, A.A. Kalamayko NSC/KIPT, Kharkov, Ukraine
	In the paper, the results of beam dynamics simulation in the transportation channel of the NSC KIPT neutron source taking into account the errors of the electromagnetic elements alignment are presented. It is show that the values of RMS alignment errors such as 100 mkm in transverse planes and 200 mkrad in angle installations lead to the essential shifts of the beam at a neutron target and, therefore, to the essential beam losses at the vacuum chamber walls. To avoid the losses one should provide additional electron beam correction and to increase the accuracy of the equipment alignment.
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MOPIK107	Injection Efficiency Simulation in the Electron Storage Ring of X-Ray Generator NESTOR	784
	A.Y. Zelinsky, P. Gladkikh, A.A. Kalamayko NSC/KIPT, Kharkov, Ukraine
	In the paper the results of the beam dynamics and injection efficiency simulation in the storage ring of the X-ray generator NESTOR are presented.
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MOPIK108	Tuning Simulations for the CLIC Traditional Beam Delivery System	788
	R.M. Bodenstein, P. Burrows JAI, Oxford, United Kingdom E. Marín, F. Plassard, R. Tomás CERN, Geneva, Switzerland
	As the design of the CLIC Beam Delivery System (BDS) evolves, tuning simulations must be performed on each of the proposed lattice designs to see which system achieves the highest luminosity in the most realistic manner. This work will focus on the tuning simulations performed on the so-called Traditional lattice design for the center-of-mass energy of 3 TeV. The lattice modifications required to target the most important aberrations and the latest tuning results will be presented.
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MOPIK110	Update on Bmad Simulations From Target to Storage Ring for the New Muon G-2 Experiment at Fermilab	791
	M. Korostelev, I.R. Bailey, A.T. Herrod, A. Wolski Cockcroft Institute, Warrington, Cheshire, United Kingdom I.R. Bailey Lancaster University, Lancaster, United Kingdom A.T. Herrod, A. Wolski The University of Liverpool, Liverpool, United Kingdom D. Stratakis Fermilab, Batavia, Illinois, USA V. Tishchenko BNL, Upton, Long Island, New York, USA
	The new muon g-2 experiment at Fermilab (E989) aims to measure the anomalous magnetic moment of the muon to an uncertainty of 140 ppb. The existing accelerator facility at Fermilab is being adapted to the requirements of the g-2 experiment and the baseline lattice design is now established. This paper presents the results of beam simulations and spin tracking carried out using the Bmad software package for the g-2 beam transport system, including a variant which bypasses the delivery ring as proposed for the beam commissioning.
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MOPIK112	High Average Power Deuteron Beam Dynamics	798
	R.A. Marsh, G.G. Anderson, S.G. Anderson, D.L. Bleuel, M.L. Crank, P. Fitsos, D.J. Gibson, M. Hall, M.S. Johnson, B. Rusnak, J.D. Sain, R. Souza, A. Wiedrick LLNL, Livermore, California, USA
	Funding: This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 Lawrence Livermore National Lab (LLNL) is developing an intense, high-brightness fast neutron source to create sub-mm-scale resolution neutron radiographs and images. A pulsed 7MeV, 300μA average-current commercial deuteron accelerator will produce an intense source (1011 n/s/sr at 0 deg) of fast neutrons (10MeV) using a novel neutron target with a small (1.5mm diameter) beam spot size to achieve high resolution. A highly flexible multi-accelerator beamline has been developed allowing for the use of both 4MeV and 7MeV RFQ/DTL deuteron accelerators. TRACE3D has been used to model the beam transport and design the quadrupole lattice and results will be presented including iterated design within beamline mechanical constraints, sensitivities, and multiple use of the magnets. Because of the high power density of such a tightly focused, modest-energy ion beam, intercepting beam diagnostics are extremely challenging, motivating novel concepts and extensions of current techniques to higher average power densities. Full duty factor beamline diagnostics will be discussed including charge, position, emittance via beam-induced fluorescence, and a full power beam dump and Faraday cup.
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MOPIK113	Beam Phase Space Tomography for FXR LIA	801
	Y.H. Wu, Y.-J. Chen LLNL, Livermore, California, USA
	Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Knowing the initial beam parameters entering an accelerator or a downstream beamline allows us to select transport tunes optimized for a desired accelerator performance. In this study, we report unfolding LLNL's FXR [1] beam parameters by using the tomography technique [2, 3] to construct the beam phase space along the accelerator's downstream beamline. The unfolded phase spaces from tomography and simulations are consistent.
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MOPIK114	End-to-End Energy Variation Study for Induction Radiography Accelerator	804
	Y.H. Wu, Y.-J. Chen LLNL, Livermore, California, USA
	Funding: This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Energy variation study for beam transport from the entrance of a conceptual induction radiography accelerator to the x-ray target has been reported previously [1]. In this report, we have extended the study upstream to the injector. To achieve minimum emittance growth and to obtain a desired final beam size, we have developed three optimal tunes. Among them, one optimal tune, capable of supressing beam break-up instability and producing acceptable corkscrew motions, is used to study the energy variation effects on radiography performance. The study shows that ±3% energy variation is acceptable.
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MOPIK115	A Design for 10 GeV, High Peak-Current, Tightly Focused Electron Beams at FACET-II	807
	G.R. White SLAC, Menlo Park, California, USA
	Funding: This work was sponsored by the Department of Energy under Contract Number: DE-AC02-76SF00515 FACET-II will be a new test facility, starting construction in 2018 within the main SLAC Linac. Its purpose is to build on the decades-long experience developed conducting accelerator R&D at SLAC in the areas of advanced acceleration and coherent radiation techniques with high-energy electron and positron beams. The design consists of a 135-MeV high-brightness photo-injector constructed in an off-axis injection line in Sector 10 of the SLAC Linac, two new 4-bend chicane bunch compressors installed in Sectors 11 and 14, with a third compression stage provided by the existing FACET W Chicane in Sector 20. We develop a design to deliver peak currents more than 160 kA to the Sector 20 interaction region at 10 GeV, with 10 'm-rad emittances at 2 nC bunch charge and 1.4 % rms energy spread. The Sector 20 bunch compressor is re-designed for maximum peak current throughput and minimal emittance degradation via CSR, and the FACET-II compression scheme is optimized. We present 6D start-end beam tracking simulations using Lucretia including ISR, CSR, wakefields and space charge effects.
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MOPIK117	On the Computation of Phase and Energy Gain for a Thin-Lens RF Gap Using a General Field Profile	810
	C.K. Allen ORNL, Oak Ridge, Tennessee, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under contract number DE-AC05-00OR22725. The thin-lens representation for an RF accelerating gap has been well developed and is documented by Lapostolle [5], Weiss [6], Wangler [14], and others [9], [10]. These models assume that the axial electric field is both centered and symmetric so it has a cosine expansion. Presented here is a model that considers general axial fields. Both the cosine and sine transit time factors are required plus their Hilbert transforms. The combination yields a complex Hamiltonian rotating in the complex plane with the synchronous phase. The phase and energy gains are computed in the pre-gap and post-gap regions then aligned with asymptotic values of wave number. Derivations are outlined, examples are shown, and simulations presented.
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MOPIK118	Model Based Optics Studies in the MEBT Section of SNS	814
	A.P. Shishlo, A.V. Aleksandrov, A.P. Zhukov ORNL, Oak Ridge, Tennessee, USA Y. Liu KEK/JAEA, Ibaraki-Ken, Japan
	Funding: This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the U.S. Department of Energy. The paper presents the beam dynamics studies for the Medium Energy Beam Transport (MEBT) section of the Spallation Neutron Source (SNS) accelerator. The analysis of measurements is based on the PyORBIT linac model. The diagnostics data includes wire scanners' profiles, slit-harp and slit-slit transverse emittances, MEBT re-bunchers calibration data, and bunch length measurements. The MEBT is a matching section between RFQ and a Drift Tube Linac (DTL). It is also a place for beam halo scraping which helps to reduce beam loss in downstream linac sections. The linac simulation code was benchmarked against the diagnostics data.
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MOPIK119	Beam Dynamics in g-2 Storage Ring	817
SUSPSIK048	use link to see paper's listing under its alternate paper code
	W. Wu, B. Quinn UMiss, University, Mississippi, USA
	The muon anomalous magnetic moment has played an important role in constraining physics beyond the Standard Model. The Fermilab Muon g-2 Experiment has a goal to measure it to unprecedented precision: 0.14 ppm. To achieve this goal, we must understand the beam dynamics systematic effects in the muon storage ring. We will present the muon beam dynamics and discuss two specific topics here: the beam resonance which is related to the muon loss and the fast rotation analysis to determine the muon momentum distribution.
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MOPIK122	The Beam Optics of the FFAG Cell of the CBETA ERL Accelerator	820
	N. Tsoupas, J.S. Berg, S.J. Brooks, G.J. Mahler, F. Méot, V. Ptitsyn, D. Trbojevic BNL, Upton, Long Island, New York, USA J.A. Crittenden Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA S.C. Tygier UMAN, Manchester, United Kingdom
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The CBETA project[*] is a prototype electron accelerator for the proposed eRHIC project[**]. The electron accelerator is based on the Energy Recovery Linac (ERL) and the Fixed Field Alternating Gradient (FFAG) principles. The FFAG arcs and the straight section of the accelerator are comprised of one focusing and one defocusing quadrupoles which are designed as Halbach-type permanent dipole magnets with quadrupoles component[***]. We will present the beam optics of the FFAG cell which is based on 3D field maps derived with the use of the OPERA computer code[****]. We will also present the electromagnetic design of the corrector magnets of the cell. * http://arxiv.org/abs/1504.00588 ** http://arxiv.org/ftp/arxiv/papers/1409/1409.1633.pdf *** K. Halbach, Nucl. Instrum. Meth. 169 (1980) pp. 1-10 **** http://www.scientificcomputing.com
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK122
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MOPIK123	Beam Dynamics Numerical Studies Regarding CBETA Cornell-BNL ERL	824
	F. Méot, S.J. Brooks, D. Trbojevic, N. Tsoupas BNL, Upton, Long Island, New York, USA S.C. Tygier UMAN, Manchester, United Kingdom
	Funding: Work supported by New York State Energy Research and Development Authority (NYSERDA) The Cornell-BNL Electron Test Accelerator CBETA is based on a 36 MeV superconducting linac and on a single 4-pass up/4-pass down linear FFAG return loop, for beam acceleration from 6 to 150 MeV and energy recovery. Numerical beam dynamics simulations have accompanied and eventually validated the quadrupole-doublet FFAG cell technology and parameters, and following that the complete return loop, all along the ERL lattice design process. They are key to assessing and validating the ERL optics and beam behavior over the whole acceleration/ER cycle, and in preparing future machine operation. This paper presents various of these beam dynamics studies, including start-to-end simulations.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK123
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MOPIK124	A New Method to Tune the Nonlinear Lattice Online	828
	W. Guo, Y. Hidaka, X. Yang BNL, Upton, Long Island, New York, USA
	Most nonlinear lattice tuning methods use only part of the optimization constraints, for example, part of the driving terms, nonlinear detuning, lifetime or injection efficiency. Even though some of the nonlinear properties can be improved, it is not guaranteed the nonlinear lattice is fully optimized. In this paper we propose to optimize the nonlinear lattice by correcting the betatron phase advance and detuning of the off-orbit lattices. It is shown that all the leading order optimization constraints are restored in this approach. One advantage of this new method is that the measurement is independent of BPM calibration errors. We succeed in both simulation and experiment in identifying the intentionally added sextupole errors.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK124
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MOPVA025	Step-Like Field Magnets to Uniform Beam Distribution and Experiment at CADS Injector-I	908
	C. Meng, Y. Chen, H. Geng, J.Y. Tang, F. Yan, L. Yu, Y.L. Zhao IHEP, Beijing, People's Republic of China
	High power is the development tendency of proton accelerator, so obtaining uniform beam distribution on target becomes more and more important and critical. The method of using step-like field magnets to obtain a uniform beam distribution on target was presented. In the beamdump line of CADS injector-I test facility four step-like field magnets have been installed to uniform beam distribution to reduce the maximum current density on the beamdump. The magnetic field of step-like field magnets have been measured and discussed in this paper. The simulation results and measurement results of beam uniformization are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA025
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WEOAB2	Correction of Beta-Beating Due to Beam-Beam for the LHC and Its Impact on Dynamic Aperture	2512
	L.E. Medina Medrano, J. Barranco García, X. Buffat, Y. Papaphilippou, T. Pieloni, R. Tomás CERN, Geneva, Switzerland J. Barranco García, T. Pieloni EPFL, Lausanne, Switzerland L.E. Medina Medrano UGTO, Leon, Mexico
	Funding: This work is supported by the European Circular Energy-Frontier Collider Study, H2020 programme under grant agreement no. 654305, by the Swiss State Secretariat for Education, Research and Innovation SERI, and by the Beam project (CONACYT, Mexico). Minimization of the beta-beating at the two main interaction points of the LHC arising from the head-on and long-range beam-beam interactions can be performed by adjusting the strength of quadrupole or sextupole correctors. This compensation scheme is applied to the current LHC optics where the results show a significant reduction of the peak and RMS beta-beating; and the impact on the dynamic aperture is computed. A proposal for a similar strategy to be adopted in the High Luminosity LHC is also discussed.
	Slides WEOAB2 [6.292 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEOAB2
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THOBA3	A Compact 335 MeV Positron Damping Ring Design for FACET-II	3652
	G.R. White, Y. Cai, R.O. Hettel, M.A.G. Johansson, V. Yakimenko, G. Yocky SLAC, Menlo Park, California, USA
	Funding: This work was supported by the Department of Energy under Contract Number: DE-AC02-76SF00515. FACET-II will be a new test facility, starting construction in 2018 within the main SLAC Linac. Its purpose is to build on the decades-long experience developed conducting accelerator R&D at SLAC in the areas of advanced acceleration and coherent radiation techniques with high-energy electron and positron beams. The positron system design utilizes an existing W-Re target in Linac Sector 19, driven by 4 nC electrons bunches at 10 GeV. We present the design of a 335 MeV, 21.4 m circumference damping ring required to damp emittance from a modified positron return beamline by a factor of 500. The transverse emittance is calculated to be 6 um-rad, fully coupled, with a bunch length of 4 mm and energy spread 0.06 %, at a bunch charge of 1 nC. The arc magnets need to be especially compact due to tight space constraints (installation will be in the existing SLAC Linac tunnel, Sector 10, with 3 m width available) and were a key design challenge. We present a solution with combined function bend/quadrupole/sextupole magnets which have been modelled in 3D using Opera.
	Slides THOBA3 [8.372 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THOBA3
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