IPAC2017 - List of Authors (Stingelin, L.)

Paper	Title	Page
TUPAB102	Compact Electron RF Travelling Wave Gun Photo Injector	1550
	R. Zennaro, P. Craievich, C.P. Hauri, L. Stingelin, A. Trisorio, C. Vicario PSI, Villigen PSI, Switzerland
	This paper reports on studies of a travelling wave photo gun as multipurpose device. The gun would be a cheap and compact alternative to thermionic guns with a bunching system or a standing wave photo injector gun. It allows one to reach much larger beam energies at the gun output. It can provide a beam with energy of up to 50 MeV and several hundred pC charge with low emittance and short bunch length. The laser system is a compact, industrial grade system with high MTBF and low maintenance cost. The gun design is based on the two-meter accelerating structures installed in SwissFEL, only the input coupler has been modified to accommodate the cathode. The gun is powered by a C-band (5.712 GHz) modulator-klystron system, identical to those of SwissFEL. The input coupler is a simple double feed coupler and it has been designed to increase the electric field enhancement at the cathode surface to improve the emittance. The first three accelerating cells have been readjusted in length in order to get the proper phase advance and synchronism with the beam. The remaining 110 accelerating cells and the output coupler follows the original design of the accelerating cavities for SwissFEL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB102
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THPAB051	A GPU Variant of Mbtrack and Its Application in SLS-2	3827
	U. Locans, A. Adelmann, L. Stingelin, H.S. Xu PSI, Villigen PSI, Switzerland U. Locans University of Latvia, Riga, Latvia
	Mbtrack is a widely used multi-bunch tracking code, developed at SOLEIL, for modeling the collective instabilities in electron storage rings. It has been applied to the Swiss Light Source upgrade proposal (SLS-2) for the study of single bunch instabilities. However, an n-bunch simulation using mbtrack requires to run n+1 MPI processes. Therefore, a large scale computing cluster may be necessary to perform the simulation. In order to reduce the demands of computing resources for multi-bunch simulations, a CUDA version of mbtrack has been developed, in which the computations of mbtrack are offloaded to a graphics processing unit (GPU). With the mbtrack-cuda variant, multi-bunch simulations can now run in a standalone workstation equipped with an Nvidia graphics card for scientific computing. The implementation and benchmark of the mbtrack-cuda code together with the applications in the study of longitudinal instabilities for SLS-2 will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB051
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THPAB077	Opal Simulations of the PSI Ring Cyclotron and a Design for a Higher Order Mode Flat Top Cavity	3891
	N. Pogue LLNL, Livermore, California, USA A. Adelmann, L. Stingelin PSI, Villigen PSI, Switzerland
	Funding: The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/ 2007-2013) under grant agreement n.°290605 (PSI-FELLOW/COFUND). The PSI cyclotron has been producing high power proton beam for 41 years. Over its lifetime it has been upgraded from producing 100 μA to 2.2 mA at 590 MeV. As the power reaches higher levels, it become more important to understand how the machine's beam dynamics will reach to new features of devices introduced. We present an OPAL (Object Oriented Parallel Accelerator Library) model of the cyclotron and compared it to the probe measurements from the machine. This model has good agreement with the measurements over the ~180 revolutions in the machine. Using this same model, a higher order mode flat top cavity was inserted into the machine to illustrate that its design and field structure allowed beam to be extracted. The HOM cavity design will also be presented. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB077
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Paper

Title

Page

Compact Electron RF Travelling Wave Gun Photo Injector

1550

R. Zennaro, P. Craievich, C.P. Hauri, L. Stingelin, A. Trisorio, C. Vicario
PSI, Villigen PSI, Switzerland

This paper reports on studies of a travelling wave photo gun as multipurpose device. The gun would be a cheap and compact alternative to thermionic guns with a bunching system or a standing wave photo injector gun. It allows one to reach much larger beam energies at the gun output. It can provide a beam with energy of up to 50 MeV and several hundred pC charge with low emittance and short bunch length. The laser system is a compact, industrial grade system with high MTBF and low maintenance cost. The gun design is based on the two-meter accelerating structures installed in SwissFEL, only the input coupler has been modified to accommodate the cathode. The gun is powered by a C-band (5.712 GHz) modulator-klystron system, identical to those of SwissFEL. The input coupler is a simple double feed coupler and it has been designed to increase the electric field enhancement at the cathode surface to improve the emittance. The first three accelerating cells have been readjusted in length in order to get the proper phase advance and synchronism with the beam. The remaining 110 accelerating cells and the output coupler follows the original design of the accelerating cavities for SwissFEL.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB102

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB051

A GPU Variant of Mbtrack and Its Application in SLS-2

3827

U. Locans, A. Adelmann, L. Stingelin, H.S. Xu
PSI, Villigen PSI, Switzerland
U. Locans
University of Latvia, Riga, Latvia

Mbtrack is a widely used multi-bunch tracking code, developed at SOLEIL, for modeling the collective instabilities in electron storage rings. It has been applied to the Swiss Light Source upgrade proposal (SLS-2) for the study of single bunch instabilities. However, an n-bunch simulation using mbtrack requires to run n+1 MPI processes. Therefore, a large scale computing cluster may be necessary to perform the simulation. In order to reduce the demands of computing resources for multi-bunch simulations, a CUDA version of mbtrack has been developed, in which the computations of mbtrack are offloaded to a graphics processing unit (GPU). With the mbtrack-cuda variant, multi-bunch simulations can now run in a standalone workstation equipped with an Nvidia graphics card for scientific computing. The implementation and benchmark of the mbtrack-cuda code together with the applications in the study of longitudinal instabilities for SLS-2 will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB051

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPAB077

Opal Simulations of the PSI Ring Cyclotron and a Design for a Higher Order Mode Flat Top Cavity

3891

N. Pogue
LLNL, Livermore, California, USA
A. Adelmann, L. Stingelin
PSI, Villigen PSI, Switzerland

Funding: The research leading to these results has received funding from the European Community's Seventh Framework Programme (FP7/ 2007-2013) under grant agreement n.°290605 (PSI-FELLOW/COFUND).
The PSI cyclotron has been producing high power proton beam for 41 years. Over its lifetime it has been upgraded from producing 100 μA to 2.2 mA at 590 MeV. As the power reaches higher levels, it become more important to understand how the machine's beam dynamics will reach to new features of devices introduced. We present an OPAL (Object Oriented Parallel Accelerator Library) model of the cyclotron and compared it to the probe measurements from the machine. This model has good agreement with the measurements over the ~180 revolutions in the machine. Using this same model, a higher order mode flat top cavity was inserted into the machine to illustrate that its design and field structure allowed beam to be extracted. The HOM cavity design will also be presented. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB077

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)