Study for the Energy Calibration of the Multi-Layer CsI(Tl) Telescope at ETF in HIRFL-CSR

YAN Duo; YUE Ke; SUN Zhiyu; WANG Shitao; YU Yuhong; ZHANG Xueheng; TANG Shuwen; FANG Fang; CHEN Junling; ZHOU Yong; SUN Yu; WANG Zhaomin; SUN Yazhou

doi:10.11804/NuclPhysRev.33.04.455

A multi-layer CsI(Tl) telescope has been designed and constructed at External Target in Facility (ETF) terminal of the Cooling Storage Ring of Heavy Ion Research Facility in Lanzhou(HIRFL-CSR), and is used for identifying light charged particles. The detector consists of seven layers of CsI(Tl) crystals, and the signals of each crystal are read out by four photomultipliers at the corners. Since the response of the CsI(Tl) crystal to the heavy ions is non-linear and also depends on the species of the incident ions, the energy calibration method of the telescope must be carefully studied. With the help of the secondary beams selected by RIBLL2 in the energy ranges from 200 to 300 MeV/u, the telescope has been tested and the energy calibration method for the first-layer crystal together with the whole telescope has been investigated. In this energy region, the quench effect in the first-layer crystal can be neglected and a linear expression can be used to represent the relation between the light output and the energy deposition in the crystal. To the total light output of the telescope, an empirical formula is used for the energy calibration. The difference between the calculated results and the experiment data is globally less than 5%.

Study for the Energy Calibration of the Multi-Layer CsI(Tl) Telescope at ETF in HIRFL-CSR

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

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

3. Lanzhou University, Lanzhou 730000, China

Funds: National Natural Science Foundation of China(11205206, 11305222, 11405242, 11222550, U1332207)

Received Date: 2015-12-29

Rev Recd Date: 2016-03-11

Publish Date: 2016-12-20

Key words:

Abstract: A multi-layer CsI(Tl) telescope has been designed and constructed at External Target in Facility (ETF) terminal of the Cooling Storage Ring of Heavy Ion Research Facility in Lanzhou(HIRFL-CSR), and is used for identifying light charged particles. The detector consists of seven layers of CsI(Tl) crystals, and the signals of each crystal are read out by four photomultipliers at the corners. Since the response of the CsI(Tl) crystal to the heavy ions is non-linear and also depends on the species of the incident ions, the energy calibration method of the telescope must be carefully studied. With the help of the secondary beams selected by RIBLL2 in the energy ranges from 200 to 300 MeV/u, the telescope has been tested and the energy calibration method for the first-layer crystal together with the whole telescope has been investigated. In this energy region, the quench effect in the first-layer crystal can be neglected and a linear expression can be used to represent the relation between the light output and the energy deposition in the crystal. To the total light output of the telescope, an empirical formula is used for the energy calibration. The difference between the calculated results and the experiment data is globally less than 5%.

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Reference (23)

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Study for the Energy Calibration of the Multi-Layer CsI(Tl) Telescope at ETF in HIRFL-CSR

doi: 10.11804/NuclPhysRev.33.04.455

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