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Chinese Physics C> 2013, Vol. 37> Issue(12) : 128101 DOI: 10.1088/1674-1137/37/12/128101

Beam tail effect of a performance-enhanced EC-ITC RF gun

  • The beam tail effect of multi-bunches will influence the electron beam performance in a high intensity thermionic RF gun. Beam dynamic calculations that illustrate the working states of single beam tail and multi-pulse feed-in of a performance-enhanced EC-ITC (external cathode independent tunable cavity) RF gun for an FEL (free electron laser) injector are performed to estimate the extracted bunch properties. By using both Parmela and homemade MATLAB codes, the effects of a single beam tail as well as interactions of multi-pulses are analyzed, where a ring-based electron algorithm is adopted to calculated RF fields and the space-charge field. Furthermore, the procedure of unexpected deviated-energy particles mixed with an effective bunch head is described by the MATLAB code as well. As a result, the performance-enhanced EC-ITC RF gun is proved to have the capability to extract continual stable bunches suitable for a high requirement THz-FEL.

  • References

    [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] Lewellen J W. Energy-Spread Compensation of a Thermionic-Cathode RF Gun. Proc. of the 2003 Particle Accelerator Conference. 2003[4] TANG Chuan-Xiang et al. High Energy Physics and Nuclear Physics, 1997, 21(efeq4): 378 (in Chinese)[5] TANG Chuan-Xiang et al. High Energy Physics and Nuclear Physics, 1997, 21(efeq5): 470 (in Chinese)[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] ZHU Ling et al. High Power Laser and Particle Beams, 2004, 16(8): 1033 (in Chinese)[8] BAI Wei et al. High Power Laser and Particle Beams, 2011, 23(10): 2729 (in Chinese)[9] PANG Jian et al. High Power Laser and Particle Beams, 2009, 21(7): 1063 (in Chinese)[10] 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[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 B et al. Nucl. Instrum. Methods A, 2013, 727: 90[13] Kim K J. Nucl. Instrum. Methods. A, 1989, 275: 201[14] Billen J H, YOUNG L M. Poission Superfish Manual, LANL, 2002[15] YOUNG L. PARMELA Manual, LANL. 1998[16] Limborg C et al. Code Comparison for Simulations of Photo-Injectors, Proc. of the 2003 Particle Accelerator Conference. 2003

  • References

    [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] Lewellen J W. Energy-Spread Compensation of a Thermionic-Cathode RF Gun. Proc. of the 2003 Particle Accelerator Conference. 2003[4] TANG Chuan-Xiang et al. High Energy Physics and Nuclear Physics, 1997, 21(efeq4): 378 (in Chinese)[5] TANG Chuan-Xiang et al. High Energy Physics and Nuclear Physics, 1997, 21(efeq5): 470 (in Chinese)[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] ZHU Ling et al. High Power Laser and Particle Beams, 2004, 16(8): 1033 (in Chinese)[8] BAI Wei et al. High Power Laser and Particle Beams, 2011, 23(10): 2729 (in Chinese)[9] PANG Jian et al. High Power Laser and Particle Beams, 2009, 21(7): 1063 (in Chinese)[10] 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[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 B et al. Nucl. Instrum. Methods A, 2013, 727: 90[13] Kim K J. Nucl. Instrum. Methods. A, 1989, 275: 201[14] Billen J H, YOUNG L M. Poission Superfish Manual, LANL, 2002[15] YOUNG L. PARMELA Manual, LANL. 1998[16] 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, PEI Yuan-Ji, QIN Bin and CHEN Qu-Shan. Beam tail effect of a performance-enhanced EC-ITC RF gun[J]. Chinese Physics C, 2013, 37(12): 128101. doi: 10.1088/1674-1137/37/12/128101
HU Tong-Ning, PEI Yuan-Ji, QIN Bin and CHEN Qu-Shan. Beam tail effect of a performance-enhanced EC-ITC RF gun[J]. Chinese Physics C, 2013, 37(12): 128101.  doi: 10.1088/1674-1137/37/12/128101 shu
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Received: 2013-02-25
Revised: 1900-01-01
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Beam tail effect of a performance-enhanced EC-ITC RF gun

    Corresponding author: QIN Bin,
  • Received Date: 2013-02-25
  • Accepted Date: 1900-01-01
  • Available Online: 2013-12-05

Abstract: The beam tail effect of multi-bunches will influence the electron beam performance in a high intensity thermionic RF gun. Beam dynamic calculations that illustrate the working states of single beam tail and multi-pulse feed-in of a performance-enhanced EC-ITC (external cathode independent tunable cavity) RF gun for an FEL (free electron laser) injector are performed to estimate the extracted bunch properties. By using both Parmela and homemade MATLAB codes, the effects of a single beam tail as well as interactions of multi-pulses are analyzed, where a ring-based electron algorithm is adopted to calculated RF fields and the space-charge field. Furthermore, the procedure of unexpected deviated-energy particles mixed with an effective bunch head is described by the MATLAB code as well. As a result, the performance-enhanced EC-ITC RF gun is proved to have the capability to extract continual stable bunches suitable for a high requirement THz-FEL.

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