Beam Dynamics Simulation of W-band Photoinjector

  • We present a beam dynamics simulation study on 1.6 cell,high gradient W-Band photocathode RF gun which is capable of generating and accelerating 300pC electron bunch. The design system is made up of 91.392GHz photocathode RF gun and 91.392GHz travelling wave linac cells. Based on the numerical simulation using SUPERFISH and PARMELA and the conventional RF linac scaling law,the design will produce 300pC at 1.74MeV with bunch length 0.72ps and normalized tranverse emittance 0.55mm mrad. We study the beam dynamics in high frequency and high gradient;due to the high gradient,the ponderomotive effect plays an important role in beam dynamics;we found the ponderomotive effect still exist with only the fundamental space harmonics (synchrotron mode) due to the coupling of the transverse and longitudinal motion.
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  • [1] Siemann R H. Advanced Electron bnacs, 19972 Palmer D. The Next Generation Photoinjector. Ph. D Dissertation, Stanford University, 19983 Gai W. Nuclear Instruments and Methods, 1998, A410: 4314 Zimmermann F, Whittum D H, Ng C K. Wake Fields in a mm-wave Linac, SI. AC-PUB-7899, 19985 Rosenzweig J, Serafini L. Transverse Particle Motion in Radio Frequency Linear Accelerators, Physical Review, 1994,E49(2): 15996 Harunan S C, Rosenzweig J. Pondermotive Focusing in Asisymmetric RF Liacs, Physical Review, 1993, E47(3): 20317 Palmer D et al. A 90GHz Photoinjector, PAC99, New York, 19998 Inoue T. Study of High-Bright Needle Photocathode for FEL, Proceedings of the 25th Linear Accelerator Meetings in Japan, 2000
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ZHU Xiong-Wei. Beam Dynamics Simulation of W-band Photoinjector[J]. Chinese Physics C, 2002, 26(3): 286-289.
ZHU Xiong-Wei. Beam Dynamics Simulation of W-band Photoinjector[J]. Chinese Physics C, 2002, 26(3): 286-289. shu
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Received: 2001-04-17
Revised: 1900-01-01
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Beam Dynamics Simulation of W-band Photoinjector

    Corresponding author: ZHU Xiong-Wei,
  • Institute of High Energy Physics,CAS,Beijing 100039,China

Abstract: We present a beam dynamics simulation study on 1.6 cell,high gradient W-Band photocathode RF gun which is capable of generating and accelerating 300pC electron bunch. The design system is made up of 91.392GHz photocathode RF gun and 91.392GHz travelling wave linac cells. Based on the numerical simulation using SUPERFISH and PARMELA and the conventional RF linac scaling law,the design will produce 300pC at 1.74MeV with bunch length 0.72ps and normalized tranverse emittance 0.55mm mrad. We study the beam dynamics in high frequency and high gradient;due to the high gradient,the ponderomotive effect plays an important role in beam dynamics;we found the ponderomotive effect still exist with only the fundamental space harmonics (synchrotron mode) due to the coupling of the transverse and longitudinal motion.

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