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Characterization of a double Time-Of-Flight detector system for accurate velocity measurement in a storage ring using laser beams | | Xin-Liang Yan
; Rui-Jiu Chen
; Meng Wang
; You-Jin Yuan
; Jian-Dong Yuan
; Shao-Ming Wang
; Guo-Zhu Cai
; Min Zhang
; Zi-Wei Lu
; Chao-Yi Fu
; Xu Zhou
; Dong-Mei Zhao
; Yuri A. Litvinov
; Yu-Hu Zhang
; | | Date: |
Fri, 17 May 2019 23:11:04 GMT (1821kb) | | Abstract: | The Isochronous Mass Spectrometry (IMS) is a powerful tool for mass
measurements of exotic nuclei with half-lives as short as several tens of
micro-seconds in storage rings. In order to improve the mass resolving power
while preserving the acceptance of the storage ring, the IMS with two
Time-Of-Flight (TOF) detectors has been implemented at the storage ring CSRe in
Lanzhou, China. Additional velocity information beside the revolution time in
the ring can be obtained for each of the stored ions by using the double TOF
detector system. In this paper, we introduced a new method of using a 658 nm
laser range finder and a short-pulsed ultra-violet laser to directly measure
the distance and time delay difference between the two TOF detectors which were
installed inside the $10^{-11}$ mbar vacuum chambers. The results showed that
the distance between the two ultra-thin carbon foils of the two TOF detectors
was ranging from 18032.5 mm to 18035.0 mm over a measurable area of
20$ imes$20 mm$^2$.
Given the measured distance, the time delay difference which comes with
signal cable length difference between the two TOF detectors was measured to be
$Delta t_{delay1-2}=99$(26) ps. The new method has enabled us to use the speed
of light in vacuum to calibrate the velocity of stored ions in the ring. The
velocity resolution of the current double TOF detector system at CSRe was
deduced to be $sigma(v)/v=4.4 imes 10^{-4}$ for laser light, mainly limited
by the time resolution of the TOF detectors. | | Source: | arXiv, 1905.9649 | | Services: | Forum | Review | PDF | Favorites | |
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