Title :
R&D of thick COBRA GEM for the application of the GEM-based TPC
Author :
Terasaki, Keisuke ; Hamagaki, H. ; Gunji, T. ; Yamaguchi, Y.L.
Author_Institution :
Center for Nucl. Study, Univ. of Tokyo, Tokyo, Japan
fDate :
Oct. 27 2013-Nov. 2 2013
Abstract :
Ion Back Flow (IBF) suppression is essential to avoid a space-charge distortion of the electric field under a high rate condition for the Time Projection Chamber (TPC). We developed Thick COBRA GEMs to investigate a capability of IBF suppression. It was found that the COBRA GEM can suppress IBF more effectively compared to a standard GEM. IBF reaches about 0.1-0.5% and energy resolution (σ) is ~ 20% with a stack configuration consisting of one standard GEM facing to the drift field and two COBRA GEMs.
Keywords :
ionisation chambers; time projection chambers; COBRA GEM; GEM-based TPC application; IBF suppression; Time Projection Chamber; drift field; electric field; high rate condition; ion back flow; space-charge distortion; Absorption; Electrodes; Electron tubes; Energy resolution; Ions; Pulse measurements; Standards;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2013 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4799-0533-1
DOI :
10.1109/NSSMIC.2013.6829412
