Precision storage lifetime measurements of highly charged heavy ions in the CSRe storage ring using a Schottky resonator  

作　　者：Qian Wang Xin-Liang Yan Guang-Yu Zhu Shahab Sanjari Li-Jun Mao He Zhao Yuri ALitvinov Rui-Jiu Chen Meng Wang Yu-Hu Zhang You-Jin Yuan Jun-Xia Wu Hong-Yang Jiao Yue Yu Zu-Yi Chen Yin-Fang Luo 

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]GSI Helmholtzzentrum für Schwerionenforschung,Planckstrasse 1,64291 Darmstadt,Germany [4]FH Aachen University of Applied Sciences,Heinrich-Mussmann-Str.1,52428 Jülich,Germany

出　　处：《Nuclear Science and Techniques》2025年第1期150-160,共11页核技术(英文)

基　　金：supported by the National Key R&D Program of China (No. 2023YFA1606401 and 2018YFA0404401);the Young Scholar of Regional Development,CAS ([2023] 15);Chinese Academy of Sciences Stable Support for Young Teams in Basic Research (No. YSBR-002);Special Fund for Strategic Pilot Technology of Chinese Academy of Sciences (No. XDB34000000)

摘　　要：Schottky mass spectrometry utilizing heavy-ion storage rings is a powerful technique for the precise mass and decay half-life measurements of highly charged ions.Owing to the nondestructive ion detection features of Schottky noise detectors,the number of stored ions in the ring is determined by the peak area in the measured revolution frequency spectrum.Because of their intrinsic amplitude-frequency characteristic(AFC),Schottky detector systems exhibit varying sensitivities at different frequencies.Using low-energy electron-cooled stored ions,a new method is developed to calibrate the AFC curve of the Schottky detector system of the Experimental Cooler Storage Ring(CSRe)storage ring located in Lanzhou,China.Using the amplitude-calibrated frequency spectrum,a notable refinement was observed in the precision of both the peak position and peak area.As a result,the storage lifetimes of the electron-cooled fully ionized^(56)Fe^(26+)ions were determined with high precision at beam energies of 13.7 and 116.4 MeV/u,despite of frequency drifts during the experiment.When electron cooling was turned off,the effective vacuum condition experienced by the 116.4 MeV/u^(56)Fe^(26+)ions was determined using amplitude-calibrated spectra,revealing a value of 2×10^(−10)mbar,which is consistent with vacuum gauge readings along the CSRe ring.The method reported herein will be adapted for the next-generation storage ring of the HIAF facility under construction in Huizhou,China.It can also be adapted to other storage ring facilities worldwide to improve precision and enhance lifetime measurements using many ions in the ring.

关 键 词：Lifetime measurement Schottky mass spectrometry Sensitivity response Highly charged heavy ion RESONATOR UH vacuum Nondestructive diagnostics 

分 类 号：TL594[核科学技术—核技术及应用]