A Method of Purifying the Secondary Beam Based on the Ions Velocities in Isochronous Atomic Mass Measurements

LIU Dawei; WANG Meng; XU Xing; YAN Xinliang; SHUAI Peng; TU Xiaolin; ZHANG Yuhu; CHENG Ruijiu; XING Yuanming; YUAN Youjing; YANG Jiancheng; XU Hushan; XIA Jiawen

doi:10.11804/NuclPhysRev.33.03.302

The isochronous Mass Spectrometry (IMS) is a powerful experimental instrument for measuring masses of short-lived nuclides.In the IMS,the nuclides of interest are produced via the projectile fragmentation reaction,then injected into the storage ring after the in-flight separation with beam line.The yields of the nuclides of interest are usually very small accompanying a huge amount of contaminant nuclides,aggravating the load of time-of-flight (TOF) detector.In the IMS nuclear mass measurement experiment conducted at the HIRFL-CSR,we developed a method of purifying the secondary beam fragments to ease the burden of the TOF detector,which is based on the differences of the ions' velocities in the beam line and realized by adjusting the injection time of secondary fragments using the Kicker system of the HIRFL-CSR.We tested and verified the method in an online experiment,and its performance is discussed in this paper.

A Method of Purifying the Secondary Beam Based on the Ions Velocities in Isochronous Atomic Mass Measurements

1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China;

3. University of Science and Technology of China, Hefei 230026, China

Funds: National Natural Science Foundation of China(U1232208, U1432125, 11205205); National Basic Research Program of China(973Program)(2013CB834401); Helmholtz-CAS Join Research Group(HCJRG-108)

Received Date: 2015-09-27

Rev Recd Date: 2015-11-11

Publish Date: 2016-09-20

Key words:

Abstract: The isochronous Mass Spectrometry (IMS) is a powerful experimental instrument for measuring masses of short-lived nuclides.In the IMS,the nuclides of interest are produced via the projectile fragmentation reaction,then injected into the storage ring after the in-flight separation with beam line.The yields of the nuclides of interest are usually very small accompanying a huge amount of contaminant nuclides,aggravating the load of time-of-flight (TOF) detector.In the IMS nuclear mass measurement experiment conducted at the HIRFL-CSR,we developed a method of purifying the secondary beam fragments to ease the burden of the TOF detector,which is based on the differences of the ions' velocities in the beam line and realized by adjusting the injection time of secondary fragments using the Kicker system of the HIRFL-CSR.We tested and verified the method in an online experiment,and its performance is discussed in this paper.

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A Method of Purifying the Secondary Beam Based on the Ions Velocities in Isochronous Atomic Mass Measurements

doi: 10.11804/NuclPhysRev.33.03.302

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