Chinese Physics C > 2005, Vol. 29 > Issue(8): 802-805

Extraction System for RFQ Cooler and Buncher

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 The graduate school of Chinese Academy of Sciences,Beijing 100049,China

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Abstract：
Two different systems, static electric guide and miniature RFQ (Radiofrequency Quadrupole), for ion extraction from a RFQ cooler and buncher have been discussed. By fluid dynamics calculation, the mass flow rate and possibly available vacuum of the being designed static electric extraction system have also been evaluated. We have made conclusions that the miniature RFQ should be used for a low helium buffer gas pressure to obtain a good beam quality, but for a higher gas pressure the static electric guide must be used. In addition, because the being designed RFQ cooler and buncher will always work in a relatively high gas pressure, the recycling and reusing of the high purity helium gas must be considered.

References

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. Nieminen A , Huikari J , Jokinen A et al . Nucl . Instrum. Methods ,2001 , A469 : 2442. Herfurth F , Dilling J , Kellerbauer A et al . Nucl . Instrum. Methods ,2001 , A469 : 2543. LIU Y, LIANGJ F , Alton GD et al . Nucl . Instrum. Methods , 2002 ,B187 : 1174. HUANGW X, WANG Y, XU H S et al . HEP NP ,2004 , 28 (Suppl.) : 90 (in Chinese)(黄文学,王 ,徐瑚珊等. 高能物理与核物理,2004 ,28 (增刊) :90)5. Kim T. Buffer Gas Cooling of Ions in a Radio Frequency Quadrupole IonGuide. PhD Thesis. Canada :McGill University , Montreal , 19976. Dahl D A , Delmore J E , Appelhans A D. Review of Scientific Instruments , 1990 , 61 : 6077. Dautet H , Gujrathi S , Wiesehahn W J et al . Nucl . Instrum. Methods ,1973 , 107 : 498. Massey B S. Mechanics of Fluids ( Fifth Edition) . UK: Van Nostrand Reinhold ,1983

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HUANG Wen-Xue, WANG Yue, XU Hu-Shan, SUN Zhi-Yu, LI Zhan-Kui, XIAO Guo-Qing and ZHAN Wen-Long. Extraction System for RFQ Cooler and Buncher[J]. Chinese Physics C, 2005, 29(8): 802-805.

HUANG Wen-Xue, WANG Yue, XU Hu-Shan, SUN Zhi-Yu, LI Zhan-Kui, XIAO Guo-Qing and ZHAN Wen-Long. Extraction System for RFQ Cooler and Buncher[J]. Chinese Physics C, 2005, 29(8): 802-805. shu

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Received: 2004-11-12
Revised: 1900-01-01

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Extraction System for RFQ Cooler and Buncher

Corresponding author:HUANG Wen-Xue,

Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China2 The graduate school of Chinese Academy of Sciences,Beijing 100049,China

Received Date:2004-11-12
Accepted Date:1900-01-01
Available Online:2005-08-05

Abstract:Two different systems, static electric guide and miniature RFQ (Radiofrequency Quadrupole), for ion extraction from a RFQ cooler and buncher have been discussed. By fluid dynamics calculation, the mass flow rate and possibly available vacuum of the being designed static electric extraction system have also been evaluated. We have made conclusions that the miniature RFQ should be used for a low helium buffer gas pressure to obtain a good beam quality, but for a higher gas pressure the static electric guide must be used. In addition, because the being designed RFQ cooler and buncher will always work in a relatively high gas pressure, the recycling and reusing of the high purity helium gas must be considered.