Study on the pre-chopper in CSNS LEBT

OUYANG Hua-Fu; ZHANG Hua-Sun; GONG Ke-Yun; LIU Hua-Chang; WU Xiao-Bing

doi:10.1088/1674-1137/34/8/016

Chinese Physics C> 2010, Vol. 34> Issue(8) : 1122-1126 DOI: 10.1088/1674-1137/34/8/016

Study on the pre-chopper in CSNS LEBT

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Abstract：
Physical designing of the pre-chopper in CSNS LEBT is carried out, which includes the deflecting voltage, the length and the width of the deflecting plates, and the gap between the deflecting plates. The most outstanding feature of the design is that both the gap and the width vary with the beam envelope size. So both the requried deflecting voltage and the loaded capacitance are lowered. In order to avoid destruction of the space charge neutralization by the pre-chopper in the whole LEBT, an electron-trapping electrode is arranged to confine the electrostatic field of the pre-chopper to the local area. To examine the reliability of the pre-chopping design in CSNS LEBT, a similar pre-chopping design in ADS RFQ LEBT is set up and an experiment on the pre-chopper is prepared. 3-dimensional simulations are carried out to determine the loaded capacitance and the applied voltage of
the electron-trapping electrode.

References

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. FANG S X, FU S N et al. J. of the Korean Phys. Soc., 2006,48(4): 697-7022. WEI J, FANG S X et al. J. Korean Phys., 2007, 50(5):1373-13773. Planner C W. Particle Accelerators, 1995, 48: 243-2504. LI J H, TANG J Y. Nucl. Instrum. Methods A, 2007, 574:221-2255. Stamples J W, Ayers J J et al. Proc. of PAC1999, 1961-19636. Acclerator Technical Design Report for J-PARC, Chapter3.1.2.17. WEI K Y. Transport Theory of Charged Particle Beams.Science Press, 1986

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OUYANG Hua-Fu, ZHANG Hua-Sun, GONG Ke-Yun, LIU Hua-Chang and WU Xiao-Bing. Study on the pre-chopper in CSNS LEBT[J]. Chinese Physics C, 2010, 34(8): 1122-1126. doi: 10.1088/1674-1137/34/8/016

OUYANG Hua-Fu, ZHANG Hua-Sun, GONG Ke-Yun, LIU Hua-Chang and WU Xiao-Bing. Study on the pre-chopper in CSNS LEBT[J]. Chinese Physics C, 2010, 34(8): 1122-1126. doi: 10.1088/1674-1137/34/8/016 shu

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Received: 2009-09-25
Revised: 2009-11-20

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on the pre-chopper in CSNS LEBT

Corresponding author: OUYANG Hua-Fu,

Received Date: 2009-09-25
Accepted Date: 2009-11-20
Available Online: 2010-08-05

Abstract:

Physical designing of the pre-chopper in CSNS LEBT is carried out, which includes the deflecting voltage, the length and the width of the deflecting plates, and the gap between the deflecting plates. The most outstanding feature of the design is that both the gap and the width vary with the beam envelope size. So both the requried deflecting voltage and the loaded capacitance are lowered. In order to avoid destruction of the space charge neutralization by the pre-chopper in the whole LEBT, an electron-trapping electrode is arranged to confine the electrostatic field of the pre-chopper to the local area. To examine the reliability of the pre-chopping design in CSNS LEBT, a similar pre-chopping design in ADS RFQ LEBT is set up and an experiment on the pre-chopper is prepared. 3-dimensional simulations are carried out to determine the loaded capacitance and the applied voltage of
the electron-trapping electrode.