Optimization of the HIRFL-CSR Cluster Target

CAI Xiao-Hong; SHAO Cao-Jie; LU Rong-Chun; LI Ming-Sheng; RUAN Fang-Fang; ZHAN Wen-Long

Chinese Physics C> 2007, Vol. 31> Issue(8) : 750-754

Optimization of the HIRFL-CSR Cluster Target

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russian Federation

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Abstract：
A new gas delivery system is designed and installed for HIRFL-CSR cluster target. The original blocked nozzle is replaced by a new one with the throat diameter of 0.12mm. New test of hydrogen and argon gases are performed. The stable jets can be obtained for these two operation gases. The attenuation of the jet caused by the collision with residual gas is studied. The maximum achievable H₂ target density is 1.75×10¹³ atoms/cm³ with a target thickness of 6.3×10¹² atoms/cm² for HIRFL-CSR cluster target. The running stability of the cluster source is tested both for hydrogen and argon. The operation parameters for obtaining hydrogen jet are optimized. The results of long time running for H₂ and Ar cluster jets look promising. The jet intensity has no essential change during the test for H₂ and Ar.

References

[1]

. XIA Jia-Wen, ZHANWen-Long, WEI Bao-Wen et al. Nucl.Instrum. Methods, 2002, A488: 112. CAI Xiao-Hong, YU De-Yang, CAO Zhu-Rong et al. Chi-nese Physics, 2004, 13: 16793. CAI Xiao-Hong, LU Rong-Chun, SHAO Cao-Jie et al. Nucl.Instrum. Methods, 2005, A555: 154. Ekstrom C. Nuclear Physics, 1997, A626: 405c5. Gruber A, Bourgeois W, Franzke B et al. Nucl. Instrum.Methods, 1989, A282: 876. LU Rong-Chun. Master Degree Thesis, Lanzhou: Instituteof Modern Physics, Chinese Academy of Sciences, 2005,49-527. Kr#228;mer A, Kritzer A, Reich H et al. Nucl. Instrum. Me-thods, 2001, B174: 205

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CAI Xiao-Hong, SHAO Cao-Jie, LU Rong-Chun, LI Ming-Sheng, RUAN Fang-Fang and ZHAN Wen-Long. Optimization of the HIRFL-CSR Cluster Target[J]. Chinese Physics C, 2007, 31(8): 750-754.

CAI Xiao-Hong, SHAO Cao-Jie, LU Rong-Chun, LI Ming-Sheng, RUAN Fang-Fang and ZHAN Wen-Long. Optimization of the HIRFL-CSR Cluster Target[J]. Chinese Physics C, 2007, 31(8): 750-754. shu

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Received: 2006-11-05
Revised: 2006-12-20

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沈阳化工大学材料科学与工程学院沈阳 110142

Optimization of the HIRFL-CSR Cluster Target

Corresponding author: CAI Xiao-Hong,

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russian Federation

Received Date: 2006-11-05
Accepted Date: 2006-12-20
Available Online: 2007-08-05

Abstract: A new gas delivery system is designed and installed for HIRFL-CSR cluster target. The original blocked nozzle is replaced by a new one with the throat diameter of 0.12mm. New test of hydrogen and argon gases are performed. The stable jets can be obtained for these two operation gases. The attenuation of the jet caused by the collision with residual gas is studied. The maximum achievable H₂ target density is 1.75×10¹³ atoms/cm³ with a target thickness of 6.3×10¹² atoms/cm² for HIRFL-CSR cluster target. The running stability of the cluster source is tested both for hydrogen and argon. The operation parameters for obtaining hydrogen jet are optimized. The results of long time running for H₂ and Ar cluster jets look promising. The jet intensity has no essential change during the test for H₂ and Ar.