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| TUPSA013 |
The CDS Parameters for Proton Linac with Moderate Heat Loading
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coupling, septum, proton, electron |
65 |
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- V. V. Paramonov
RAS/INR, Moscow
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The Cut Disk Structure (CDS) was originally proposed for high energy linac in L-band or S-band frequency range. CDS combines simultaneously high coupling coefficient, high shunt impedance and small transverse dimensions. For lower particle velocity the structure loses in shunt impedance due to relatively thick partition with internal cooling channels. For moderate heat loading internal cooling is not necessary and partition thickness is limited only by mechanical rigidity. The structure equalizes in shunt impedance with another bi-periodical structures and another CDS advantages come in front. Calculated CDS parameters for proton linac are presented.
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| TUPSA015 |
Injector Complex of the NICA Facility
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ion, rfq, electron, proton |
71 |
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- A. O. Sidorin, A. V. Butenko, E. D. Donets, E. E. Donets, V. V. Fimushkin, A. Govorov, V. Kobets, I. N. Meshkov, V. Monchinsky, G. V. Trubnikov
JINR, Dubna, Moscow Region
- A. Belov
RAS/INR, Moscow
- O. K. Belyaev, Yu. A. Budanov, A. P. Maltsev, I. A. Zvonarev
IHEP Protvino, Protvino, Moscow Region
- V. V. Kapin
MEPhI, Moscow
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The injection complex of the NICA facility consists of existing Alvarez-type linac LU-20, new heavy ion linac HILac, polarized and heavy ion sources. The LU-20 is under modernization now, the HILac will be constructed during coming years. Parameters of the accelerators are presented.
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| TUPSA034 |
Distortions of Proton Beam 2-D Images and Profiles due to Beam Space Charge
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ion, proton, simulation, space-charge |
116 |
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- P. I. Reinhardt-Nickoulin, A. Feschenko, S. A. Gavrilov, I. V. Vasilyev
RAS/INR, Moscow
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The special residual gas ion transverse section monitor is used at Proton LINAC INR RAS output to provide measurements of beam parameters. There are distortions and errors of measurements which are caused by various external and internal factors during the formation of beam transverse section images. Below estimations of these distortions and results of numerical simulation of registration process of images are resulted, resolution of the detector and accuracy of measurements which are spent with it are discussed.
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| WECHB02 |
Review of the Diamond Light Source Timing System
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gun, booster, photon, controls |
144 |
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- Y. S. Chernousko, P. Hamadyk, M. T. Heron
Diamond, Oxfordshire
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Funding: Diamond Light Source Ltd
The Diamond Light Source timing system utilises a central event generator with distributed event receivers at the equipment being controlled for all accelerator and beamline subsystems. This provides distributed fiducials with resolution of 8 nsec and stability of 8 psec. It is based on commercial hardware from Micro-Research, Finland. This paper describes the installed timing system and summarizes 5-year operational experience of the system. This includes the hardware and software, the distributing network, and the achieved precision and stability of the system. Developments in the timing system to support additional operational functionality of Diamond, including top-up operation, are also discussed.
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Slides
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| WEPSB012 |
Method to Estimate the Beam and Structure Parameters for the Dispersion Accelerator Parts
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emittance, quadrupole, coupling, lattice |
193 |
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| WEPSB013 |
Reconstruction of the Beam Parameters and Structure Characteristics for INR Isotope Channel
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target, emittance, proton, quadrupole |
196 |
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| WEPSB022 |
Nonlinear Electron Beam Dynamics with Large Energy Spread in the Magnetic Mirror
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electron, quadrupole, dipole, sextupole |
212 |
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| WEPSB023 |
Electron Beam Dynamics with Space Charge in Linear Accelerator
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electron, acceleration, space-charge, electromagnetic-fields |
215 |
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- Y. A. Fomin, V. Korchuganov
RRC, Moscow
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This paper describes electron beam dynamics with space charge in existing linear accelerator of Kurchatov source of synchrotron radiation. The linac structure operates with standing wave mode pulse power and without particle prebuncher. The results of comparison of electron beam parameters at the linac output with and without space charge consideration are presented. Electron beam shaping process starting from continuous beam to bunched beam on initial stage of acceleration under the action both of linac RF field and particle space charge field is considered. The main attention gives to calculate particle space charge field of the electron beam, which bring in essential contribution into beam dynamics on initial stage of shaping and accelerating electron bunches. The results of computer simulation of the electromagnetic field into linac structure taking with the help of ANSYS code are presented.
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| WEPSB041 |
CANopen Connected Power Supply Control Systems for the Electron Linacs
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power-supply, controls, storage-ring, electron |
266 |
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- A. S. Chepurnov
MSU SINP, Moscow
- V. N. Boriskin, A. A. Sarvilov, A. N. Savchenko, D. L. Stepin, G. N. Tsebenko, V. N. Vereshchaka
NSC/KIPT, Kharkov
- I. V. Gribov
MSU, Moscow
- A. F. Shamarin
Marathon Ltd., Moscow
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Power supplies which feed magnetic systems of electron linac together with the control system are very critical parts of any linac. The quality of power supplies and control software defines safety of the accelerator operation, stability and cost of operation. One of the today’s tendencies in power supply system architecture is to use distributed CAN-connected power supplies with high level of local intellectual properties. These properties allow to achieve high stability, high safety of operation together with the specific features such as coil temperature check without any temperature sensors. Such programmable power supplies with the intellectual CANopen controller have been designed for the specific accelerator applications. The control system software was adapted to operate with CANopen protocol. Marathon's IPP-1/100 & IPP-4/35 power supplies with CANopen* are used now within the control systems of LU-60m and LU-10 linacs. 3200 hours of continues operation were achieved since the year 2008.
* V. N.Boriskin et. al. POWER SUPPLY CONTROL SYSTEM FOR THE LINAC OF THE "NESTOR" STORAGE RING/ Proceedings of RuPAC 2008, Zvenigorod, Russia, 2008, pp.252-254.
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| WEPSB042 |
Universal Timer Module for the Timing System of the Accelerating-Storage Complex ITEP-TWAC
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controls, ion, synchrotron, extraction |
269 |
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- A. Y. Orlov, P. N. Alekseev, S. V. Barabin, D. A. Liakin
ITEP, Moscow
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A multipurpose synchronization module for renovating timing system of ITEP-TWAC accelerator facility is developed. A group of such modules is aimed to implement a sophisticated set of synchronization functions among four accelerators – proton linac I2, ion injector I3, buster synchrotron UK and accelerating and storage ring U10. This FPGA based module generates up to 16 output pulses related to timing scale (T), magnetic field scale (B), radio frequency, external events or their combination. The read back function allows controlling the pulses propagation on cycle-to-cycle basis. The structure of the module, a description of basic functions and IO interface are presented in details. Also an example of system configuration based on the developed module is discussed.
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| THCHA02 |
Recovery Process Stability Study in Energy Recovery Accelerator
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electron, microtron, coupling, free-electron-laser |
283 |
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- V. G. Kurakin
LPI, Moscow
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Energy recovery technique in rf accelerator based applications allows to save rf power and reduce radioactive background as well. In this operation mode used beam is directed back to the accelerator in decelerating rf phase and returns back its kinetic energy to rf field. Thus, rf generator that feeds linac covers cavities walls rf losses only and those part of beam kinetic energy that is used for useful effects production as well. Vector sum of three fields – induced in the linac by an external rf source, accelerated and decelerated beams – determines energy and phase of the beam at linac exit, and together with beam return path optics amplitude and phase of decelerated bunches and hence third component of mentioned sum. In the case of positive sign of this feedback and sufficient amplification in the closed loop just described instability takes place. The main equations that determine beam-rf cavity interaction in energy recovery rf accelerator are derived, single mode approximation being used. Expressions for small deviation from steady state are obtained followed by stability analysis. Results of calculation for increments of instability presented and discussed.
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Slides
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| THCHB02 |
SCRF Development at TRIUMF
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acceleration, ion, electron, heavy-ion |
292 |
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- V. Zvyagintsev, B. Amini, C. D. Beard, R. J. Dawson, T. Emmens, K. Fong, A. Grassellino, P. R. Harmer, D. Kishi, P. Kolb, A. Koveshnikov, C. Laforge, D. Lang, M. P. Laverty, R. E. Laxdal, R. Leewe, D. Longuevergne, M. Marchetto, A. K. Mitra, T. C. Ries, I. Sekachev, R. W. Shanks, B. S. Waraich, F. Yan, Q. Zheng
TRIUMF, Vancouver
- R. Edinger
PAVAC, Richmond, B. C.
- R. S. Orr, W. Trischuk
University of Toronto, Toronto, Ontario
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TRIUMF started SCRF development with the superconducting heavy ion linear accelerator project, ISAC-II, in 2000. Since that time much work has been completed for development, prototyping and testing. The ISAC-II project was successfully completed and we now have in operation 40 superconducting bulk Nb QWR cavities assembled in eight cryomodules. The last twenty cavities, just completed, were produced by PAVAC Industries Inc. of Richmond BC; the first superconducting accelerator cavities produced in Canada. In 2007 TRIUMF started development towards a 50MeV electron superconducting linear accelerator to be used as a driver to produce radioactive ion beams through photofission. The accelerator is based on TTF/ILC elliptical bulk Nb cavities technology. Results, experience and plans of the SCRF program at TRIUMF will be discussed.
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Slides
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| THCHD01 |
55 MeV Special Purpose Race-Track Microtron Commissioning
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gun, electron, radiation, klystron |
316 |
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- A. I. Karev, A. N. Lebedev, V. G. Raevsky
LPI, Moscow
- L. Brothers, L. Wilhide
VFCT, Covington, Kentucky
- A. N. Ermakov, A. N. Kamanin, V. V. Khankin, N. I. Pakhomov, V. I. Shvedunov
MSU, Moscow
- N. P. Sobenin
MEPhI, Moscow
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Funding: This work was supported by CRDF Grant #RP0-10732-MO-03 (LLNL)
Results of Lebedev Institute 55 MeV special-purpose race-track microtron (RTM) commissioning are presented. RTM is intended for photonuclear detection of hidden explosives based on initiation of photonuclear activation and consequent registration of secondary gamma-rays penetrating possible screening substances. RF system is based on KIU-168 klystron with 6MW/6 kW pulsed/average power operating at 2856 MHz in self-oscillating mode with on-axis coupled standing wave bi-periodic accelerating structure in a feed-back loop. Maximum RF power is now at the level of 2.5 MW. With this RF power energy gain per pass of 5 MeV is provided and up to 10 mA pulsed beam current is obtained at RTM exit. The RTM control system is based on NI modules and LabView software. Beam diagnostic is provided by beam current monitors, by synchrotron radiation and by transition radiation. RTM tuning is achieved by adjustment of: (1) a current in steering coils, (2) an accelerating structure field level, (3) a focal power of solenoidal lens and quadrupole doublet, and (4) injection magnet current.
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Slides
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| THPSC002 |
Feasibility of Alternating-Phase Focusing for a Chain of Short Independently-Phased Resonators
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focusing, ion, proton, acceleration |
322 |
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- V. V. Kapin, A. Nesterovich
MEPhI, Moscow
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Alternating-phase focusing (APF) is usually realized in a long drift-tube structure with multiple acceleration gaps. The synchronous phase alternates periodically gap-by-gap according to either sinusoidal or square-wave laws. The period of synchronous phase oscillations depends on charge-to-mass ratio of accelerated ions and increases with beam energy. One period may include up to 10-20 accelerating gaps. In the case of square-wave law, the sets of 5-10 neighboring gaps have the same synchronous phase, while whole structure consists of continuous chain such gap-sets with a constant value of synchronous phases. Therefore, every such gap-set can be formed into a separate resonator. As result a long multiple gap structure is converted into a chain of short independently-phased resonators. Such realization of APF linac allows more flexibility in a phase variation, while additional focusing-matching lenses can be set up in betweens of resonators. In this report possible parameters of such linac are evaluated and discussed.
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| THPSC003 |
Development of Wire-Meshed Electrostatic Lenses for Proton Linac
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focusing, proton, rfq, ion |
325 |
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- V. V. Kapin, B. Y. Bogdanovich, A. Nesterovich, V. V. Yanenko
MEPhI, Moscow
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The 2-MeV 150-MHz proton RFQ linac is set up at the Radiation-Acceleration Center (RAC) of Moscow-Engineering Physics Institute (MEPhI). Its output beam-line contains doublet of the electrostatic focusing lenses with a novel design featured by the two-dimensional electric field and wire-meshed beam apertures. Every lens provides a transverse focusing effect only in one plane, while does not affect on the beam in a perpendicular plane. In this report, the analytical and numerical analysis of this lens is presented. The optics of output beam-line including these lenses is evaluated with TRACE-3D code. The experimental construction of the lens doublet is presented.
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| THPSC014 |
One Aspect of Thermal Stability for 4-vane RFQ Operation with High Heat Loading
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rfq, coupling, controls, simulation |
352 |
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- V. V. Paramonov
RAS/INR, Moscow
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Due to dispersion properties, 4-vane RFQ cavity without resonant coupling is a thermally unstable structure. With deterioration of balance for local detuning, especially near cavity ends, there is a possibility for runaway in the field distribution and related thermal-stress effects. It can, in principle, finish with irreversible plastic deformations and cavity frequency shift. Both the increment and the threshold of instability are proportional to the average dissipated RF power. This possibility increases for long RFQ cavities. Also particularities for the cavity ends design are important. Some general features of this effect are discussed and illustrated with simulations.
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| THPSC022 |
Development and Application of Electron Linac Electromagnetic Devices for Radiotechnologies
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electron, controls, pick-up, target |
369 |
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- V. A. Shendrik, A. N. Dovbnya, A. E. Tolstoy
NSC/KIPT, Kharkov
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The creation and subsequent service of modern electron linear accelerators at the NSC KIPT have brought evidence for possible successful introduction of radiotechnology processes using electron irradiation. A further extension and complication of physical problems solvable on the basis of radiotechnologies have put forward new and increased requirements for the systems of beam scanning, extraction and formation on the targets and extended irradiated objects. The results of applying our methods developed for prompt measurement of the kinetic energy of the scanned electron beam are presented. For measurement and continuous control of the electron energy the hodoscope magnetic spectrometer technique has been used. The spectrometer includes only one deflecting magnet and has no magnetic focusing. If the real field topography in the magnet is known in detail, then using the input and output coordinates of deflected particles it is possible to determine their energy, and also the chromaticity of electron beam. The step-pulse scanning of the beam is realized through the use of an air-core short-pulse electromagnet. Development and tests of separate units of the device are under way
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