Experimental investigation of the transition energy γt in the isochronous mode of the HIRFL-CSRe

被引：19

作者：

Ge, W. W. ^{[1
,2
]}

Yuan, Y. J. ^{[1
]}

Yang, J. C. ^{[1
]}

Chen, R. J. ^{[1
]}

Yan, X. L.

Du, H. ^{[1
]}

Li, Z. S. ^{[1
,2
]}

Yang, J. ^{[1
]}

Yin, D. Y. ^{[1
]}

Mao, L. J. ^{[1
]}

Li, X. N. ^{[1
]}

Zheng, W. H. ^{[1
]}

Shen, G. D. ^{[1
]}

Wu, B. ^{[1
,2
]}

Ruan, S. ^{[1
,2
]}

Wang, G. ^{[1
,2
]}

Zhao, H. ^{[1
,2
]}

Wang, M. ^{[1
]}

Sun, M. Z. ^{[1
]}

Xing, Y. M. ^{[1
]}

Zhang, P. ^{[1
,2
]}

Fu, C. Y. ^{[1
,2
]}

Shuai, P. ^{[1
]}

Xu, X. ^{[1
]}

Zhang, Y. H. ^{[1
]}

Bao, T. ^{[1
]}

Chen, X. C. ^{[1
,3
]}

Huang, W. J. ^{[1
,4
]}

Li, H. F. ^{[1
,2
]}

Liu, J. H. ^{[1
,2
]}

Litvinov, Yu. A. ^{[1
,3
]}

Litvinov, S. ^{[1
,3
]}

Zeng, Q. ^{[5
]}

Zhou, X. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany

[4] Univ Paris Saclay, Univ Paris Sud, CNRS, CSNSM,IN2P3, F-91405 Orsay, France

[5] East China Univ Technol, Sch Nucl Sci & Engn, Nanchang 330013, Jiangxi, Peoples R China

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2018年 / 908卷

基金：

欧洲研究理事会;

关键词：

Isochronous Mass Spectrometry; Transition energy; Two-TOF detector system; Nonlinear momentum compaction factor; First and second-order isochronous correction; DIRECT MASS MEASUREMENTS; EXOTIC NUCLEI; SPECTROMETRY; RING; FACILITY; IONS;

D O I：

10.1016/j.nima.2018.08.059

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The Isochronous Mass Spectrometry (IMS) based on storage rings is a powerful technique for mass measurement of short-lived exotic nuclei. The transition energy gamma(t) of the storage ring is a vital parameter of the IMS technique. It is difficult to measure the gamma(t) and its relation to momentum spread or circulating length, especially to monitor the variation of gamma(t) during experiments. An experimental investigation on the gamma(t) has been performed for the IMS experiment at the Cooler Storage Ring of the Heavy Ion Research Facility in Lanzhou (HIRFL-CSRe). With the velocity measured by two time-of-flight (TOF) detectors, the gamma(t) as a function of orbital length can be determined. The influences of higher order magnetic field components on the gamma(t) function were inferred for isochronous correction. This paper introduces and investigates the influence of dipole magnetic fields, quadrupole magnetic fields and sextupole magnetic fields on the gamma(t) function. With the quadrupole magnets and sextupole magnets corrections, a mass resolution of 171332 (FWHM) and sigma(T)/T = 1.34 x 10(-6) were reached, which shall be compared with 31319 (FWHM) and sigma(T)/T = 7.35 x 10(-6) obtained without correction.

引用

页码：388 / 393

页数：6

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