A compact start time counter using plastic scintillators readout with MPPC arrays for the WASA-FRS HypHI experiment

E Liu,V Drozd,H Ekawa,S Escrig,Y Gao,Y He,A Kasagi,M Nakagawa,H Ong,C Rappold,R Sekiya,T.R Saito,X Tang,Y.K Tanaka,H Wang,A Yanai,P Achenbach,H Alibrahim Alfaki,F Amjad,M Armstrong,K.-H Behr,J Benlliure,Z Brencic,T Dickel,S Dubey,M Feijoo-Fontán,H Fujioka,H Geissel,F Goldenbaum,A Graña González,E Haettner,M.N Harakeh,H Heggen,C Hornung,N Hubbard,K Itahashi,M Iwasaki,N Kalantar-Nayestanaki,M Kavatsyuk,E Kazantseva,A Khreptak,B Kindler,R Knoebel,H Kollmus,D Kostyleva,S Kraft-Bermuth,N Kurz,B Lommel,S Minami,D.J Morrissey,P Moskal,I Mukha,A Muneem,K Nakazawa,C Nociforo,S Pietri,J Pochodzalla,S Purushothaman,E Rocco,J.L Rodríguez-Sánchez,P Roy,R Ruber,S Schadmand,C Scheidenberger,P Schwarz,V Serdyuk,M Skurzok,B Streicher,K Suzuki,B Szczepanczyk,N Tortorelli,M Vencelj,T Weber,H Weick,M Will,K Wimmer,A Yamamoto,J Yoshida,J Zhao

doi:10.1016/j.nima.2024.169384

Abstract

We have developed a compact detector for measuring beam particles using plastic scintillators readout through Multi-Pixel Photon Counters, which is employed for hypernuclear measurements in the WASA-FRS experiment at GSI. The Time-of-Flight resolution of the newly-developed detector has been investigated in relation to the overvoltage with respect to the breakdown voltage, a maximum counting rate of approximately 3×106/s per segment, and a maximum beam charge of Z = 6. The evaluated Time-of-Flight resolutions between the neighboring segments of the detector range from 44.6±1.3 ps to 100.3±3.6 ps (σ) depending on the segment, overvoltage values, and beam intensity. It is also observed that the Time-of-Flight resolution is inversely correlated to the beam atomic charge (Z).

Full Text