A Device Used in Pulsed Slow Positron Beam's Stretching

WEI Cun-Feng; WANG Bao-Yi; WANG Ping; CAO Xing-Zhong; ZHANG Zhi-Ming; MA Yan-Yun; XUE De-Sheng; WEI Long

Chinese Physics C> 2006, Vol. 30> Issue(10) : 1010-1013

A Device Used in Pulsed Slow Positron Beam's Stretching

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education of Lanzhou University,\\Lanzhou 730000, China2 Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China

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Abstract：
A slow positron beam's stretching device has been designed and constructed on Beijing Slow Positron Beam, which based on a 1.3GeV linac. Positron was storage and stretching use Penning-Trap technique. Measurements show that the positron storage time strongly depends on the vacuum level in Penning Trap tube. Two modes was used to release the positrons from storage part, lowering V_C while V_B kept constant and rising V_B while V_C kept constant. This technique makes the pulsed positron beam to a quasi-continuous beam. The energy spread of positrons depend on in release mode. In the latter mode, we observe that the energy spread was reduced to a value less than 1.0eV. The time profile in user-defined waveform is more uniform. It is beneficial to reduce the probability of amplifier pileup especially in the case of measurement with high counting rate.

References

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. Shultz J, Lynn K G. Rev. Mod. Phys., 1988, 60: 7012. Haarsma L H, Abdullah K, Gabrielse G. Phys. Rev. Lett.,1995, 75: 8063. Werth G. Contemp. Phys., 1985, 26: 2414. WANG Bao-Yi et al. Positron Annihilation-ICPA-13,Japan: TTP(Trans Tech. Publicutions), 2003. 5135. CAO Xing-Zhong et al. HEP NP, 2004, 28(5): 560-563(in Chinese)(曹兴忠等. 高能物理与核物理, 2004, 28(5): 560-563)6. YU R S et al. Nucl. Instrum. Methods, 2001, A457: 419

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WEI Cun-Feng, WANG Bao-Yi, WANG Ping, CAO Xing-Zhong, ZHANG Zhi-Ming, MA Yan-Yun, XUE De-Sheng and WEI Long. A Device Used in Pulsed Slow Positron Beam's Stretching[J]. Chinese Physics C, 2006, 30(10): 1010-1013.

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Received: 2006-01-07
Revised: 2006-02-20

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沈阳化工大学材料科学与工程学院沈阳 110142

A Device Used in Pulsed Slow Positron Beam's Stretching

Corresponding author: WEI Cun-Feng,

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education of Lanzhou University,\\Lanzhou 730000, China2 Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2006-01-07
Accepted Date: 2006-02-20
Available Online: 2006-10-05

Abstract: A slow positron beam's stretching device has been designed and constructed on Beijing Slow Positron Beam, which based on a 1.3GeV linac. Positron was storage and stretching use Penning-Trap technique. Measurements show that the positron storage time strongly depends on the vacuum level in Penning Trap tube. Two modes was used to release the positrons from storage part, lowering V_C while V_B kept constant and rising V_B while V_C kept constant. This technique makes the pulsed positron beam to a quasi-continuous beam. The energy spread of positrons depend on in release mode. In the latter mode, we observe that the energy spread was reduced to a value less than 1.0eV. The time profile in user-defined waveform is more uniform. It is beneficial to reduce the probability of amplifier pileup especially in the case of measurement with high counting rate.