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Chinese Physics C> 2014, Vol. 38> Issue(1) : 018101 DOI: 10.1088/1674-1137/38/1/018101

Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

  • To meet the requirements of high performance THz-FEL (Free Electron Laser), a compact scheme of FEL injector was proposed. A thermionic cathode was chosen to emit electrons instead of a photo-cathode with its complex structure and high cost. The effective bunch charge was improved to ～200 pC by adopting an enhanced EC-ITC (External Cathode Independently Tunable Cells) RF gun to extract micro-bunches; back bombardment effects were almost eliminated as well. Constant gradient accelerator structures were designed to improve energy to ～14 MeV, while the focusing system was applied for emittance suppressing and bunch state maintenance. The physical design and beam dynamics of the key components for the FEL injector were analyzed. Furthermore, start-to-end simulations with multi-pulses were performed using homemade MATLAB and Parmela. The results show that continual high brightness electron bunches with a low energy spread and emittance could be obtained stably.
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    [1] Rimjaem S et al. Nucl. Instrum. Methods A, 2004, 533: 258[2] Hama H et al. Nucl. Instrum. Methods A, 2004, 528: 271[3] TANG Chuan-Xiang et al. High Energy Physics and Nuclear Physics, 1997, 21(4): 378 (in Chinese)[4] TANG Chuan-Xiang et al. High Energy Physics and Nuclear Physics, 1997, 21(5): 470 (in Chinese)[5] Lewellen J W. Energy-Spread Compensation of a Thermionic-Cathode RF Gun. Proc. of the 2003 Particle Accelerator Conference. 2003[6] Tanaka T et al. An Independently Tunable Cells Thermionic RF Gun (ITC-RF gun) for Sub-Picosecond Short Pulse. Proc. of the 27th International Free Electron Laser Conference. 2005[7] Tanaka T et al. Simulation Study of a Thermionic RF Gun for High Brightness and Short Pulse Beam. Proc. of the 2005 Particle Accelerator Conference. 2005[8] PANG Jian et al. Design of Compact Self Bunch RF Gun. High Power Laser and Particle Beams, 2009, 21(7): 1063 (in Chinese)[9] PEI Yuan-Ji et al. R D on a Compact EC-ITC RF Gun for FEL. Proc. of the 2010 International Particle Accelerator Conference. 2010[10] LIANG Jun-Jun et al. High Power Laser and Particle Beams, 2012, 24(1): 197 (in Chinese)[11] TAN Ping et al. Simulation and Optimization Research of a THz Free-Electron Laser Oscillator. Proc. of the 2009 Particle Accelerator Conference. 2009[12] QIN Bin et al. Design Considerations for a Hybrid Undulator Applied in a Terahertz FEL Oscillator. Proc. of the 2012 International Particle Accelerator Conference. 2012[13] Young L. PARMELA Manual, LANL, 1998[14] ZHANG Shan-Cai et al. High Energy Physics and Nuclear Physics, 2006, 30(Supp. I): 21 (in Chinese)[15] Limborg C et al. Code Comparison for Simulations of Photo-Injectors, Proc. of the 2003 Particle Accelerator Conference. 2003

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HU Tong-Ning, CHEN Qu-Shan, PEI Yuan-Ji, LI Ji and QIN Bin. Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun[J]. Chinese Physics C, 2014, 38(1): 018101. doi: 10.1088/1674-1137/38/1/018101
HU Tong-Ning, CHEN Qu-Shan, PEI Yuan-Ji, LI Ji and QIN Bin. Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun[J]. Chinese Physics C, 2014, 38(1): 018101.  doi: 10.1088/1674-1137/38/1/018101 shu
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Received: 2013-03-22
Revised: 1900-01-01
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Physical design of FEL injector based on the performance-enhanced EC-ITC RF gun

    Corresponding author: PEI Yuan-Ji,
  • Received Date: 2013-03-22
  • Accepted Date: 1900-01-01
  • Available Online: 2014-01-05

Abstract: To meet the requirements of high performance THz-FEL (Free Electron Laser), a compact scheme of FEL injector was proposed. A thermionic cathode was chosen to emit electrons instead of a photo-cathode with its complex structure and high cost. The effective bunch charge was improved to ～200 pC by adopting an enhanced EC-ITC (External Cathode Independently Tunable Cells) RF gun to extract micro-bunches; back bombardment effects were almost eliminated as well. Constant gradient accelerator structures were designed to improve energy to ～14 MeV, while the focusing system was applied for emittance suppressing and bunch state maintenance. The physical design and beam dynamics of the key components for the FEL injector were analyzed. Furthermore, start-to-end simulations with multi-pulses were performed using homemade MATLAB and Parmela. The results show that continual high brightness electron bunches with a low energy spread and emittance could be obtained stably.

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