TY  - CONF
AU  - Bettoni, S.
AU  - Craievich, P.
AU  - Ferrari, E.
AU  - Ganter, R.
AU  - Lutman, A.A.
AU  - Marcellini, F.
AU  - Penco, G.
AU  - Prat, E.
AU  - Reiche, S.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Beam Manipulation Using Self-Induced Fields at the SwissFEL Injector
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - In the past years wakefield sources have been used to manipulate electron beams in accelerators. We recently installed corrugated structures for a total length of 2~m at the SwissFEL injector to test novel schemes for beam manipulations. We present simulations and early experimental results. We compare the model predictions with the measured data for the bunch energy losses and the kick factor, and show early results for the longitudinal phase space linearization and the production of current spikes.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 266
EP  - 269
KW  - FEL
KW  - simulation
KW  - electron
KW  - experiment
KW  - wakefield
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW073
UR  - http://jacow.org/ipac2019/papers/mopgw073.pdf
ER  - 

TY  - CONF
AU  - Nesteruk, K.P.
AU  - Calzolaio, C.
AU  - Schippers, J.M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Alignment of a Magnetic Lattice Based on Particle Tracking
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - In calculations based on particle tracking in 3D magnetic field maps alignment of the components of a magnetic lattice is essential to obtain desired properties of beam optics. In this contribution we propose a method to control and correct misalignments during the process of the beam optics design. These misalignments would result from overlapping fringe fields of different field maps. The 3D field maps are obtained from the software for electromagnetic calculations OPERA. The full 3D map is saved in the tracking coordinate system and a ROOT (An Object Oriented Data Analysis Framework) ntuple is then created for analysis. The trajectory of the reference particle is calculated by means of OPAL - open source code developed at the Paul Scherrer Institut (PSI). The transverse magnetic field profiles allow possible misalignments to be precisely determined and the corresponding corrections to be calculated. Moreover, the multipole content in discrete locations along the lattice can be controlled by performing a polynomial fit, which calculates the magnetic field harmonics with respect to the reference track. This method was used at PSI for a design of a model of the magnetic lattice for a superconducting gantry for proton therapy with a large momentum acceptance.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 324
EP  - 326
KW  - alignment
KW  - lattice
KW  - optics
KW  - controls
KW  - sextupole
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW090
UR  - http://jacow.org/ipac2019/papers/mopgw090.pdf
ER  - 

TY  - CONF
AU  - Shi, L.
AU  - Ischebeck, R.
AU  - Reiche, S.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - THz Radiator Based on Photonic Band Gap Crystal for SwissFEL
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The electromagnetic radiation in 1-20 THz has many unique properties when it interacts with matter due to its non-ionizing excitation in matter. Especially the dynamics of the excited matter can be probed with the help of X-ray pulses at a free electron laser facility, e.g. SwissFEL, to deepen our understanding of a wide range of phenomena. Due to its high research potential, various means of THz generation have been proposed and demonstrated. We investigate preliminarily here its generation based on a relativistic electron bunch and a photonic band gap crystal (PBG) made of dielectric rods. The PBG provides additional degrees of freedom for the THz pulse tuning. Additionally, the unwanted radiation parts can be damped by the structure in order to minimize the deleterious beam dynamics effects. The crystal also promises the integration of generation, filtering and coupling for transport into a single piece.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 693
EP  - 696
KW  - electron
KW  - photon
KW  - GUI
KW  - experiment
KW  - FEL
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPRB056
UR  - http://jacow.org/ipac2019/papers/moprb056.pdf
ER  - 

TY  - CONF
AU  - White, G.R.
AU  - Cobb, T.M.
AU  - Dalesio, L.R.
AU  - Davidsaver, M.A.
AU  - Hartman, S.M.
AU  - Hickin, D.G.
AU  - Johnson, A.N.
AU  - Junkes, H.
AU  - Kasemir, K.-U.
AU  - Konrad, M.G.
AU  - Korhonen, T.
AU  - Kraimer, M.R.
AU  - Lange, R.
AU  - Pearson, M.R.
AU  - Rivers, M.L.
AU  - Sekoranja, M.
AU  - Shankar, M.V.
AU  - Shen, G.
AU  - Shroff, K.
AU  - Veseli, S.
AU  - Vodopivec, K.
AU  - Zimoch, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - The EPICS Software Framework Moves from Controls to Physics
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The Experimental Physics and Industrial Control System (EPICS), is an open-source software framework for high-performance distributed control, and is at the heart of many of the world’s large accelerators and telescopes. Recently, EPICS has undergone a major revision, with the aim of better computing supporting for the next generation of machines and analytical tools. Many new data types, such as matrices, tables, images, and statistical descriptions, plus users’ own data types, now supplement the simple scalar and waveform types of the former EPICS. New computational architectures for scientific computing have been added for high-performance data processing services and pipelining. Python and Java bindings have enabled powerful new user interfaces. The result has been that controls are now being integrated with modelling and simulation, machine learning, enterprise databases, and experiment DAQs. We introduce this new EPICS (version 7) from the perspective of accelerator physics and review early adoption cases in accelerators around the world.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1216
EP  - 1218
KW  - EPICS
KW  - controls
KW  - detector
KW  - database
KW  - experiment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUZZPLM3
UR  - http://jacow.org/ipac2019/papers/tuzzplm3.pdf
ER  - 

TY  - CONF
AU  - Aiba, M.
AU  - Böge, M.
AU  - Citterio, A.
AU  - Dehler, M.M.
AU  - Lüdeke, A.
AU  - Ozkan Loch, C.
AU  - Stingelin, L.
AU  - Streun, A.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Exploring the Potential of the Swiss Light Source
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Swiss Light Source (SLS) has been on-line since 2001. Although its performance meets the specifications, it still has a potential to achieve better storage ring beam parameters. We explore two possible improvements. The first one is for the beam lifetime. There are 480 rf buckets while normally 390 bunches are stored. The gap in filing pattern (90 empty buckets) is held to suppress ion instability. After many years of operation, however, the vacuum condition is much better than that of the time when the SLS was turned on. Hence it is possible to shorten the gap. The beam lifetime can then be prolonged due to less bunch current while keeping the net beam current. The study may be also useful to predict possible filling patter in SLS2, which is the SLS upgrade planned. The second one is for the beam emittance. The nominal energy closed orbit coincides with the axes of quadrupole magnets. An off-momentum closed orbit is therefore off-centered through quadrupoles, resulting in a damping partition shift. The beam emittance can be decreased at the expense of a larger energy spread. This was successfully achieved in the ESRF booster. We study whether it is applicable to the SLS storage ring.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1554
EP  - 1556
KW  - emittance
KW  - storage-ring
KW  - operation
KW  - damping
KW  - cavity
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW066
UR  - http://jacow.org/ipac2019/papers/tupgw066.pdf
ER  - 

TY  - CONF
AU  - Leemann, S.C.
AU  - Aiba, M.
AU  - Bengtsson, J.
AU  - Dallin, L.O.
AU  - Sannibale, F.
AU  - Streun, A.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Progress on a Novel 7BA Lattice for a 196-m Circumference Diffraction-Limited Soft X-Ray Storage Ring
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The ALS Upgrade to a diffraction-limited soft x-ray storage ring calls for ultralow emittance in a very limited circumference. In this paper we report on progress with a lattice based on a 7BA with distributed chromatic correction. This lattice relies heavily on longitudinal gradient bends and reverse bending in order to suppress the emittance, so that, despite having only seven bends, ultralow emittance can be achieved in addition to large dynamic aperture and momentum acceptance. An initial alternate 7BA lattice has been revised to relax magnet requirements as well as further increase off-energy performance and resilience to machine imperfections. We now demonstrate ±2.5 mm dynamic aperture including errors and calculate the effect of IBS to show that this lattice achieves 6 hours Touschek lifetime (at 500 mA, including errors) and a brightness of roughly 3x10²¹ ph/s/mm²/mrad²/0.1%BW at 1 keV.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1635
EP  - 1638
KW  - lattice
KW  - emittance
KW  - sextupole
KW  - optics
KW  - storage-ring
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW095
UR  - http://jacow.org/ipac2019/papers/tupgw095.pdf
ER  - 

TY  - CONF
AU  - Dehler, M.M.
AU  - Aiba, M.
AU  - Citterio, A.
AU  - Stingelin, L.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Overview of Collective Effects in SLS 2.0
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - At the end of 2017, the conceptual design for an upgrade of the Swiss Light Source was finished, promising a 40 fold smaller emittance and a corresponding increase of the spectral brightness from the current value. From the point of view of collective effects, the main changes in the new design are a reduced chamber size, fully coated with NEG, and operation at small and negative momentum compaction with low synchrotron frequency. We give an overview of the latest results for the ring. Most critical is the threshold for the longitudinal single bunch instability. Taking into account the combined effect of wake impedances and CSR, we have to rely on bunch stretching by a higher harmonic system to achieve stable operation at nominal current.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1658
EP  - 1661
KW  - cavity
KW  - impedance
KW  - operation
KW  - simulation
KW  - damping
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW107
UR  - http://jacow.org/ipac2019/papers/tupgw107.pdf
ER  - 

TY  - CONF
AU  - Dehler, M.M.
AU  - Alberti, S.
AU  - Citterio, A.
AU  - Hahn, M.
AU  - Hogge, J.P.
AU  - Liu, X.Y.
AU  - Marques, H.P.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Characterization of NEG Coatings for SLS 2.0
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - To limit desorption and ameliorate pumping of the narrow 20 mm aperture vacuum chamber of SLS2.0, it is planned to fully coat it with nonevaporable getter (NEG) material. NEG coating can be produced with different structural characteristics, from dense films to columnar growth, with corresponding distinct electrical properties affecting the machine impedance and the instability threshold of the accelerator. In order to evaluate and characterize the coating process for geometries similar to the SLS chamber, we measured the resonance properties of coated and uncoated shorted waveguide pieces. First tests were done with standard X band waveguides at 12 and 7 GHz. Test setups using elliptical cross sections are in preparation, also for higher frequencies allowing the characterization of thin NEG layers. The final goal is to have a standardized process to test of samples coated by external producers. We describe the setups and first results.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1662
EP  - 1665
KW  - GUI
KW  - impedance
KW  - resonance
KW  - coupling
KW  - vacuum
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPGW108
UR  - http://jacow.org/ipac2019/papers/tupgw108.pdf
ER  - 

TY  - CONF
AU  - Grattoni, V.
AU  - Ackermann, S.
AU  - Aßmann, R.W.
AU  - Faatz, B.
AU  - Hillert, W.
AU  - Lang, T.
AU  - Lechner, C.
AU  - Mohammad Kazemi, M.M.
AU  - Paraskaki, G.
AU  - Reiche, S.
AU  - Zemella, J.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Simulation Studies for a EEHG seeded FEL in the XUV
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Echo-enabled harmonic generation (EEHG) is a promising technique for seeded free electron lasers (FELs) not only to go down to wavelengths of 4 nm, but also to simplify the schemes that are currently used to achieve a similar wavelength range (double cascade HGHG). Thus a study optimizing the EEHG performance in the wavelength range from 60 to §I{4}{nm} has been performed. The more critical working point, at 4 nm, is here analyzed in terms of seed laser energy stability for two different seed laser frequencies: visible and UV.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1705
EP  - 1708
KW  - laser
KW  - bunching
KW  - electron
KW  - FEL
KW  - simulation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPRB013
UR  - http://jacow.org/ipac2019/papers/tuprb013.pdf
ER  - 

TY  - CONF
AU  - D'Auria, G.
AU  - Aicheler, M.
AU  - Aksoy, A.A.
AU  - Alesini, D.
AU  - Apsimon, R.
AU  - Arnesano, J.M.
AU  - Bellaveglia, M.
AU  - Bernhard, A.
AU  - Bosco, F.
AU  - Buonomo, B.
AU  - Burt, G.
AU  - Calvi, M.
AU  - Cardelli, F.
AU  - Castaneda Cortes, H.M.
AU  - Castilla, A.
AU  - Clarke, J.A.
AU  - Croia, M.
AU  - Cross, A.W.
AU  - Dattoli, G.
AU  - Di Mitri, S.
AU  - Diomede, M.
AU  - Dowd, R.T.
AU  - Dunning, D.J.
AU  - Fang, W.D.
AU  - Faus-Golfe, A.
AU  - Ferrario, M.
AU  - Ficcadenti, L.
AU  - Gallo, A.
AU  - Gazis, E.N.
AU  - Gazis, N.
AU  - Geometrante, R.
AU  - Gethmann, J.
AU  - Giribono, A.
AU  - Goryashko, V.A.
AU  - Han, Y.
AU  - Jacewicz, M.
AU  - Janssen, X.J.A.
AU  - Kokole, M.
AU  - Latina, A.
AU  - Liu, X.
AU  - Luiten, O.J.
AU  - Marcos, J.
AU  - Marín, E.
AU  - Mostacci, A.
AU  - Mutsaers, P.H.A.
AU  - Muñoz Horta, R.
AU  - Nguyen, F.
AU  - Palumbo, L.
AU  - Petralia, A.
AU  - Piersanti, L.
AU  - Priem, J.M.A.
AU  - Pérez, F.
AU  - Rochow, R.A.
AU  - Rossi, C.
AU  - Ruber, R.J.M.Y.
AU  - Schmidt, T.
AU  - Schulte, D.
AU  - Spataro, B.
AU  - Stapnes, S.
AU  - Stragier, X.F.D.
AU  - Taylor, G.
AU  - Thompson, N.
AU  - Vaccarezza, C.
AU  - Wu, X.W.
AU  - Wuensch, W.
AU  - Zhang, K.
AU  - Zhang, L.
AU  - Zhu, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - The CompactLight Design Study Project
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The H₂020 CompactLight Project (www. CompactLight.eu) aims at designing the next generation of compact X-rays Free-Electron Lasers, relying on very high gradient accelerating structures (X-band, 12 GHz), the most advanced concepts for bright electron photo injectors, and innovative compact short-period undulators. Compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, and will be significantly more compact, with a smaller footprint,  as a consequence of the lower energy and the high-gradient X-band structures. In addition, the whole infrastructure will also have a lower electrical power demand as well as lower construction and running costs.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1756
EP  - 1759
KW  - FEL
KW  - linac
KW  - electron
KW  - undulator
KW  - brightness
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPRB032
UR  - http://jacow.org/ipac2019/papers/tuprb032.pdf
ER  - 

TY  - CONF
AU  - Shi, L.
AU  - Baboi, N.
AU  - Jones, R.M.
AU  - Joshi, N.Y.
AU  - Pierini, P.
AU  - Reiche, S.
AU  - Sulimov, A.
AU  - Vogel, E.
AU  - Wamsat, T.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Higher Order Mode Spectra Study of 3.9 GHz Superconducting Radio Frequency Cavities for the European XFEL
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - It is important to verify both by simulation and experiments the wakefields in superconducting radio frequency (SRF) cavities, which can degrade the electron beam quality considerably or impose excessive heat load if left undamped. In this paper, we investigate the Higher Order Mode (HOM) spectra of the 3.9 GHz SRF cavities, which are assembled in a cryogenic module and are used to linearize the longitudinal phase space of the electron beam in the injector of the European XFEL. The HOM spectra are significantly different from the ones from a single cavity due to the coupling of the modes amongst cavities. The measurements not only provide direct input for the beam dynamics studies but also for the beam instrumentation utilizing these modes. The mode spectra are also investigated with a number of numerical simulations and the comparison with measurements shows favorable agreement.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1840
EP  - 1843
KW  - cavity
KW  - HOM
KW  - simulation
KW  - electron
KW  - FEL
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPRB075
UR  - http://jacow.org/ipac2019/papers/tuprb075.pdf
ER  - 

TY  - CONF
AU  - Allaria, E.
AU  - Badano, L.
AU  - De Ninno, G.
AU  - Di Mitri, S.
AU  - Diviacco, B.
AU  - Fawley, W.M.
AU  - Ferrari, E.
AU  - Garzella, D.
AU  - Grattoni, V.
AU  - Hemsing, E.
AU  - Mirian, N.S.
AU  - Penco, G.
AU  - Pop, M.A.
AU  - Prat, E.
AU  - Rebernik Ribič, P.
AU  - Roussel, E.
AU  - Spampinati, S.
AU  - Spezzani, C.
AU  - Trovò, M.
AU  - Xiang, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Amplified Emission of a Soft-X Ray Free-Electron Laser Based on Echo-Enabled Harmonic Generation
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - We report the first evidence of substantial gain in a soft-X ray Free Electron Laser (FEL) based on Echo-Enabled Harmonic Generation (EEHG). The experiment was focused on harmonics 36 (~7.3nm) and 45 (5.8 nm) and clearly demonstrated the expected EEHG capability of generating powerful and coherent FEL pulses, with strongly reduced sensitivity to electron-beam fluctuations. The experiment was carried out at FERMI, the seeded FEL user facility at Elettra-Sincrotrone Trieste.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2230
EP  - 2232
KW  - FEL
KW  - laser
KW  - electron
KW  - experiment
KW  - free-electron-laser
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEXXPLM1
UR  - http://jacow.org/ipac2019/papers/wexxplm1.pdf
ER  - 

TY  - CONF
AU  - Bracco, C.
AU  - Aiba, M.
AU  - Goddard, B.
AU  - Gorgisyan, I.
AU  - Turner, M.
AU  - Velotti, F.M.
AU  - Verra, L.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Systematic Optics Studies for the Commissioning of the AWAKE Beamline
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The commissioning of the AWAKE electron beam line was successfully completed in 2018. Despite a modest length of about 15 m, this low-energy line is quite complex and several iterations were needed before finding satisfactory agreement between the model and the measurements. The work allowed to precisely predict the size and positioning of the electron beam at the merging point with the protons inside the plasma cell, where no direct measurement is possible. All the key aspects and corrections which had to be included in the model, precautions and systematic checks to apply for the correct setup of the line are presented. The sensitivity of the ~18 MeV electron beam to various perturbations, like different initial optics parameters and beam conditions, energy jitter and drifts, earth’s magnetic field etc., is described.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2383
EP  - 2386
KW  - electron
KW  - optics
KW  - plasma
KW  - experiment
KW  - quadrupole
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPMP029
UR  - http://jacow.org/ipac2019/papers/wepmp029.pdf
ER  - 

TY  - CONF
AU  - Reggiani, D.
AU  - Kiselev, D.C.
AU  - Seidel, M.
AU  - Talanov, V.
AU  - Wohlmuther, M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Combined MCNP/Turtle Simulation of the SINQ Beam Line at PSI-HIPA
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - With a nominal beam power of nearly 1.4 MW, the PSI High Intensity Proton Accelerator (HIPA) complex is currently at the forefront of the high intensity frontier of particle accelerators. A key issue of such facilities is the minimization of beam losses that could lead to excessive activation of beam line components. At HIPA, the SINQ beam line is particularly subject to relatively large losses since it receives the highly divergent beam scattered off a 40 or 60 mm thick muon production graphite target (TE). So far, for HIPA, beam line simulations have been carried out only by means of the matrix multiplication codes TRANSPORT and TURTLE. Although very efficient, such tools do not allow a precise determination of beam losses whenever targets and collimators are substantially affecting the beam optics. A true understanding of how beam halo and the low momentum tail contribute to the measured losses can only be achieved by complementing the traditional simulations techniques by a tool that can transport beam particles in different materials and, at the same time, handle complex geometries like the ones of collimators situated in the beam line. Moreover, such an improved beam line simulation would give a significant contribution in evaluating the feasibility of the SINQ beam rotation system currently under study. In this paper we present a simulation of the SINQ beam line combining MCNP models of TE and collimator sections with the TURTLE computation of the magnetic channel.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2410
EP  - 2413
KW  - simulation
KW  - target
KW  - proton
KW  - scattering
KW  - optics
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPMP038
UR  - http://jacow.org/ipac2019/papers/wepmp038.pdf
ER  - 

TY  - CONF
AU  - Chrin, J.T.M.
AU  - Aiba, M.
AU  - Snuverink, J.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - A Channel Access Software Platform for Beam Dynamics Applications in Scripting Languages
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - To facilitate the seamless integration of EPICS (Experimental Physics and Industrial Control System) into high-level applications in particle accelerators, a dedicated modern C++ Channel Access Interface (CAFE) library* provides a comprehensive and user-friendly interface to the underlying control system. Functionality is provided for synchronous and asynchronous interaction of single and composite groups of channels, coupled with an abstract layer tailored towards beam dynamics applications and complex modelling of virtual accelerators. Equivalent consumable solutions in scripting and domain-specific languages can then be accelerated by providing bindings to the relevant methods of the interface platform. This is exemplified by CAFE’s extensive MATLAB interface, incarnated through a single MATLAB executable (mex) file, and a high performance Python interface written in the Cython programming language. A number of gratifying particularities specific to these language extension modules are revealed.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2661
EP  - 2664
KW  - interface
KW  - controls
KW  - EPICS
KW  - software
KW  - MMI
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW079
UR  - http://jacow.org/ipac2019/papers/wepgw079.pdf
ER  - 

TY  - CONF
AU  - Liu, X.Y.
AU  - Bopp, M.
AU  - Dehler, M.M.
AU  - Scherer, A.
AU  - Sun, B.G.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Design of Resonant Stripline BPM for an IR-FEL Project at NSRL
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - This paper presents the design of a 476MHz resonant stripline beam position monitor (BPM) for an IR-FEL machine at NSRL. This type of BPM was developed based on stripline BPM by moving the coupling feedthrough closer to the short end downstream. This modification introduces a resonance that gives this BPM a better capability to detect lower beam currents compared to broadband devices like button and stripline BPM. Meanwhile, the change is small enough to use the same type of electronics [1-3]. In the following sections, the basic principle, nonlinear effect, sensitivity, the filtered sum and difference signals, and the mechanical design of this BPM will be mainly discussed.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2665
EP  - 2667
KW  - FEL
KW  - dipole
KW  - electron
KW  - vacuum
KW  - emittance
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW080
UR  - http://jacow.org/ipac2019/papers/wepgw080.pdf
ER  - 

TY  - CONF
AU  - Srinivasan, S.
AU  - Duperrex, P.-A.
AU  - Schippers, J.M.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Quadrated Dielectric-Filled Reentrant Cavity Resonator as a Proton Beam Position Diagnostic
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Low proton beam intensities (0.1-40 nA) are used for medical treatment of tumours at the PROSCAN facility in Paul Scherrer Institut (PSI). A cavity resonator using four quadrants operating in a dipole mode resonance has been developed to measure beam positions at these low intensities. The TM110 resonance frequency of 145.7 MHz is matched to the second harmonic of the beam pulse repetition rate (i.e.72.85 MHz). HFSS (High Frequency Structural Simulator) provides the BPM geometry and important parameters such as pickup position; dielectric dimensions etc. Comparison of test bench measurement and simulation provides good agreement. The measured position and signal sensitivity are limited by the noise, so that a position signal can be derived at beam intensities of at least 10 nA . We will discuss potential methods to increase the sensitivity. The dipole cavity resonator can be a promising candidate as a non-invasive position di-agnostic at the low proton beam intensities used in pro-ton therapy
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2676
EP  - 2679
KW  - cavity
KW  - dipole
KW  - pick-up
KW  - proton
KW  - simulation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPGW083
UR  - http://jacow.org/ipac2019/papers/wepgw083.pdf
ER  - 

TY  - CONF
AU  - Shafqat, N.
AU  - Bopp, M.
AU  - Giannessi, L.
AU  - Lucas, T.G.
AU  - Masciovecchio, C.
AU  - Milloch, M.
AU  - Serpico, C.
AU  - Svandrlik, M.
AU  - Trovò, M.
AU  - Zennaro, R.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Commissioning of S-band Cavity Test Facility at Elettra for Conditioning of High Gradient Structures for the Fermi Linac Upgrade
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - FERMI is the seeded Free Electron Laser (FEL) user facility at Elettra laboratory in Trieste, operating in the VUV to soft X-rays spectral range. In order to extend the FEL spectral range to shorter wavelengths, a feasibility study for increasing the Linac energy from 1.5 GeV to 1.8 GeV is actually going on. A short prototype of a new High Gradient (HG) S-band accelerating structure has been built in collaboration with Paul Scherrer Institute (PSI). The new structures are intended to replace the present Backward Travelling Wave (BTW) sections and tailored to be operated at a gradient of 30 MV/m. For RF conditioning and high power testing of prototype, a Cavity Test Facility (CTF) is commissioned at FERMI. The test facility is equipped with RF pulse compressor system and a dedicated diagnostic for breakdown rate (BDR) measurements and events localization. In this paper we present in detail cavity test facility of FERMI and high power testing of the first prototype.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 2846
EP  - 2848
KW  - cavity
KW  - LLRF
KW  - FEL
KW  - hardware
KW  - linac
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPRB021
UR  - http://jacow.org/ipac2019/papers/weprb021.pdf
ER  - 

TY  - CONF
AU  - Skripka, G.
AU  - Dijkstal, P.
AU  - Iadarola, G.
AU  - Mether, L.
AU  - Rumolo, G.
AU  - Wulff, E.G.T.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Comparison of Electron Cloud Build-Up Simulations Against Heat Load Measurements for the LHC Arcs With Different Beam Configurations
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - Electron cloud effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. A large number of electrons impacting on the beam screens of the cold magnets induces significant heat load, reaching values close to the full cooling capacity available from the cryogenic system. Interestingly, it is observed that parts of the machine that are by design identical show very different heat loads. We used numerical simulations to investigate the possibility that these differences are induced by different surface properties, in particular maximum Secondary Electron Yield (SEY) for the different cryomagnets. Using the PyECLOUD code, the electron cloud build-up was simulated assuming different values of SEY in the LHC cold magnets. Comparing the measured heat loads to the simulation results for the 25 ns beams at 450 GeV we have identified the SEY values that match the observations in these conditions. These SEY values were found to be in good agreement with the heat loads measured with different beam configurations (changing the bunch pattern, the bunch intensity and the beam energy).
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3232
EP  - 3235
KW  - electron
KW  - simulation
KW  - operation
KW  - synchrotron-radiation
KW  - radiation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPTS051
UR  - http://jacow.org/ipac2019/papers/wepts051.pdf
ER  - 

TY  - CONF
AU  - Nevay, L.J.
AU  - Abramov, A.
AU  - Albrecht, J.
AU  - Alden, S.E.
AU  - Boogert, S.T.
AU  - Garcia Morales, H.
AU  - Gibson, S.M.
AU  - Shields, W.
AU  - Snuverink, J.
AU  - Walker, S.D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - BDSIM: Recent Developments and New Features Beyond V1.0
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - BDSIM is a program that creates a 3D model of an accelerator from an optical beam line description using a suite of high energy physics software including Geant4, CLHEP and ROOT. In one single simulation the passage of particles can be tracked accurately through an accelerator including the interaction with the accelerator material and subsequent secondary radiation production and transport. BDSIM is regularly used to simulate beam loss and energy deposition as well as machine detector interface studies. In this paper we present the latest developments beyond BDSIM V1.0 added for ongoing studies. For simulation of collimation systems several new additions are described including new element geometry, enhanced sensitivity and output information. The output has been further enhanced with aperture impact information and dose information from scoring meshes. As well as supporting the full suite of Geant4 physics lists, a new user interface is described allowing custom physics lists and user components to be easily included in BDSIM. New undulator, crystal collimator and wire-scanner elements are also described.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3259
EP  - 3262
KW  - simulation
KW  - detector
KW  - radiation
KW  - site
KW  - experiment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPTS058
UR  - http://jacow.org/ipac2019/papers/wepts058.pdf
ER  - 

TY  - CONF
AU  - Przygoda, K.P.
AU  - Butkowski, Ł.
AU  - Fenner, M.
AU  - Hierholzer, M.
AU  - Rybaniec, R.
AU  - Schlarb, H.
AU  - Schmidt, Ch.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - New MicroTCA Piezo Driver (PZT4)
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - In the paper we would like to present a new Micro Telecommunication Computing Architecture (MicroTCA) piezo driver (PZT4). The piezo driver module is capable of driving of 4 piezo actuators with high voltages up to 160 Vpp. It is also possible to measure cavity mechanical vibrations using 4 analog to digital converters (ADC) ported to the driver electronics. The new piezo driver can be supplied using internal 12 V payload power provided by the MicroTCA standard. For the applications that need more than 30 W of the input power, the external power supply module can be provided. In order to protect the piezo driver electronics against output short condition a dedicated supervision circuit is designed. The piezo driver module has been setup at Cryo Module Test Bench (CMTB) facility in Deutsches-Elektronen Synchrotron (DESY) as a part of the single cavity low-level radio frequency (LLRF) controls. The LLRF control system has been used to demonstrate the radio frequency (RF) field stabilization and cavity tuning capabilities for continuous (CW) and pulse modes of operation of 1.3 GHz superconducting resonant RF (SCRF) cavity. The preliminary results are demonstrated and briefly discussed.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3860
EP  - 3863
KW  - cavity
KW  - high-voltage
KW  - controls
KW  - operation
KW  - power-supply
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPRB025
UR  - http://jacow.org/ipac2019/papers/thprb025.pdf
ER  - 

TY  - CONF
AU  - Šuštar, T.
AU  - Bucher, P.
AU  - Modic, R.
AU  - Theidel, G.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - A Novel Approach to Triggering and Beam Synchronous Data Acquisition
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - SwissFEL, the new Free-Electron Laser facility is a 740 m long accelerator with the goal of providing pulses of light between 6 and 30 fs long at a wavelength of 1 to 7 Å at 100 Hz*. To support shot-to-shot photon diagnostic* and link the measurements to other measurements along the machine that belong to the same machine pulse, a new triggering and data acquisition system was developed. A new protocol was introduced which allows deterministic triggering, configuration and data transfer via one full-duplex optical connection. The measurement data is stamped with an unique pulse identifier, delivered from the SwisFEL Timing System**. A readout and control interface was developed to support data delivery to the Data Acquisition Dispatching Layer* and for controlling the system.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 4224
EP  - 4227
KW  - FPGA
KW  - controls
KW  - interface
KW  - EPICS
KW  - data-acquisition
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPTS054
UR  - http://jacow.org/ipac2019/papers/thpts054.pdf
ER  -