Design and construction of a time-of-flight wall detector at External Target Facility of HIRFL-CSR

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2018-06, Vol.893, p.68-74
• Main Authors: Sun, Y., Sun, Z.Y., Yu, Y.H., Yan, D., Tang, S.W., Sun, Y.Z., Wang, S.T., Zhang, X.H., Yue, K., Fang, F., Chen, J.L., Zhang, Y.J., Hu, B.T.
• Format: Article
• Language: English
• Subjects: Photo-multiplier tubes; Plastic scintillator; Time resolution; Time-of-flight wall detector
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2018.03.030

A Time-Of-Flight Wall (TOFW) detector has been designed and constructed at the External Target Facility (ETF) of HIRFL-CSR. The detector covers a sensitive area of 1.2 × 1.2 m2 and consists of 30 modules. Each module is composed of a long plastic scintillator bar with two photo-multiplier tubes coupled at both ends for readout. The design and manufacture details are described and the test results are reported. The performance of the TOFW detector has been tested and measured with cosmic rays and a 310 MeV/u 40Ar beam. The results show that the time resolutions of all the TOFW modules are better than 128 ps, satisfying the requirements of the experiments which will be carried out at the ETF.