Keyword: vacuum
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SUPAG10 Design Study of a Fast Kicker Magnet Applied to the Beamline of a Proton Therapy Facility kicker, proton, simulation, cyclotron 110
  • W.J. Han
    Huazhong University of Science and Technology, State Key Laboratory of Advanced Electromagnetic Engineering and Technology,, Hubei, People’s Republic of China
  • X. Liu, B. Qin
    HUST, Wuhan, People’s Republic of China
  Funding: Huazhong University Of Science And Technology
A proton therapy facility based on an isochronous superconducting cyclotron is under development in HUST (Huazhong University of Science and Technol-ogy). A fast kicker magnet will be installed in the up-stream of the degrader to perform the beam switch function by kicking the proton beam to the down-stream beam stop. The rising and falling time of the kicker is about 100us, and the maximum repetition rate is 500Hz. This paper introduces simulation and opti-mization of the eddy current and dynamic magnetic field of the fast kicker, by using FEM code OPERA-3D. For kicker materials, laminated steel and soft ferrite are compared and the MnZn ferrite is chosen. Design-ing considerations includes the eddy current effect, field hysteresis, and mechanical structure of the kicker will also be introduced.
slides icon Slides SUPAG10 [1.184 MB]  
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About • paper received ※ 19 October 2018       paper accepted ※ 04 December 2018       issue date ※ 26 January 2019  
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TUPAG02 First Steps Towards a New Finite Element Solver for MOEVE PIC Tracking electron, FEM, simulation, emittance 260
  • U. van Rienen, C.R. Bahls, J. Heller, D. Zheng
    Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock, Germany
  • U. van Rienen
    University of Rostock, Rostock, Germany
  Funding: This work has been supported by the German Federal Ministry for Research and Education BMBF under contract 015K16HRA.
A relevant task in designing high-brilliance light sources based on high-current linear accelerators (e.g. Energy Recovery Linacs (ERLs)) consists in systematic investigations of ion dynamics in the vacuum chamber of such machines. This is of high importance since the parasitic ions generated by the electron beam turned out to be a current-limiting factor for many synchrotron radiation sources. In particular, the planned high current operation at ERL facilities requires a precise analysis and an accurate development of appropriate measures for the suppression of ion-induced beam instabilities. The longitudinal transport of ions through the whole accelerator plays a key role for the establishment of the ion concentration in the machine. Using the Particle-in-Cell (PIC) method, we started redesigning our code MOEVE PIC Tracking in order to allow for the fast estimation of the effects of ions on the beam dynamics. For that, we exchanged the previously used Finite Difference (FD) method for the solution of Poisson’s equation within the PIC solver by a solver based on the Finite Element Method (FEM). Employing higher order FEM, we expect to gain improved convergence rates and thus lower computational times. We chose the Open Source Framework FEniCS for our new implementation.
slides icon Slides TUPAG02 [0.924 MB]  
DOI • reference for this paper ※  
About • paper received ※ 21 October 2018       paper accepted ※ 24 October 2018       issue date ※ 26 January 2019  
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