Study on Beam Spot Size Requirement in PES, BSRF and the Beamline Upgrade

QIAN Hai-Jie; YAN Yong-Lian; SU Run; WANG Jia-Ou

Chinese Physics C> 2005, Vol. 29> Issue(S1) : 144-147

Study on Beam Spot Size Requirement in PES, BSRF and the Beamline Upgrade

Institute of High Energy Physics,CAS,Beijing 100049,China

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Abstract：
Different photoelectron analyzer has different detectable area and acceptance angle, the experimental count rate is up to the photon flux density in the detected area, so the size of the X-ray source used for the analyzer is very important to get the best experimental result. Due to the experimental resolution and count rate of the analyzers is not so ideal, their relation to the beam spot of the beamline is studied. Result shows the size of beam spot at the sample position is too large,which helped to decide the upgrade project for beamline 4B9B and make the beam size much more smaller. A new design for high photon energy branch of the beamline upgrade with new post-focusing mirror is finished, meanwhile the focusing of low photon energy branch is also better designed.

References

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. VSW Scientific Instruments Corporation. VSW InstructionManual on HA150, HA54 Hemispherical Analyzer, 19892. CHEN C T, Plummer E W. Nucl. Instrum. Methods, 1984,222: 1033. Edited by Institute of High Energy Physics. Research Re-port of Beijing Synchrotron Radiation Facility, NationalLaboratory of Beijing Electron Positron Collider, 1992.1(in Chinese)(中科院高能物理研究所编辑.北京同步辐射装置研制报告，北京正负电子对撞机国家实验室，1992.1)4. SHU D, WANG W, LIU W et al. Rev. Sci. Instrum., 1989,60(7): 20855. YAN Yong-Lian, LIU Feng-Qin, YANG Yi et al. Improve-ment of Toroidal Mirror in Beamline 4B9B, In: AnnualReport of BSRF, 1993, 26,(in Chinese)(阎永廉，刘风琴，杨易等.4B9b束线超环面镜的改进.见:北京同步辐射装置年报1993, 26)6. QIAN Hai-Jie, YAN Yong-Lian et al. HEP NP, 2004,28(3): 321(in Chinese)(钱海杰，阎永廉等.高能物理与核物理，2004, 28(3): 321)

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QIAN Hai-Jie, YAN Yong-Lian, SU Run and WANG Jia-Ou. Study on Beam Spot Size Requirement in PES, BSRF and the Beamline Upgrade[J]. Chinese Physics C, 2005, 29(S1): 144-147.

QIAN Hai-Jie, YAN Yong-Lian, SU Run and WANG Jia-Ou. Study on Beam Spot Size Requirement in PES, BSRF and the Beamline Upgrade[J]. Chinese Physics C, 2005, 29(S1): 144-147. shu

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Received: 2005-10-31
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study on Beam Spot Size Requirement in PES, BSRF and the Beamline Upgrade

Corresponding author: QIAN Hai-Jie,

Institute of High Energy Physics,CAS,Beijing 100049,China

Received Date: 2005-10-31
Accepted Date: 1900-01-01
Available Online: 2005-01-02

Abstract: Different photoelectron analyzer has different detectable area and acceptance angle, the experimental count rate is up to the photon flux density in the detected area, so the size of the X-ray source used for the analyzer is very important to get the best experimental result. Due to the experimental resolution and count rate of the analyzers is not so ideal, their relation to the beam spot of the beamline is studied. Result shows the size of beam spot at the sample position is too large,which helped to decide the upgrade project for beamline 4B9B and make the beam size much more smaller. A new design for high photon energy branch of the beamline upgrade with new post-focusing mirror is finished, meanwhile the focusing of low photon energy branch is also better designed.