Title :
A GEM based TPC for the LEGS experiment
Author :
Yu, B. ; Geronimo, G. De ; Fried, J. ; Kandasamy, A. ; Makowiecki, D.S. ; Smith, G.C. ; Radeka, V. ; Hoblit, S. ; Sandorfi, A.M. ; Thorn, C.E. ; Norum, B.E. ; Wang, K. ; Mahon, J.C.
Author_Institution :
Brookhaven Nat. Lab., Upton, NY, USA
Abstract :
A compact time projection chamber (TPC) has been constructed for the LEGS (Laser Electron Gamma Source) experiment at BNL. The TPC uses double GEMs as the amplification stage. Position encoding is achieved through charge division using zigzag shaped anode pads. The TPC has a 35 cm diameter active area and a 50 cm long drift depth. It has more than 7000 channels of readout electronics in the form of custom designed ASICs. A novel peak sensing circuit is used to measure simultaneously the amplitude and timing of the signal peak from an anode pad. Test results from a shorter prototype version of the TPC as well as the construction of the final detector are discussed.
Keywords :
drift chambers; electron multiplier detectors; nuclear electronics; time projection chambers; ASIC; GEM based TPC; LEGS experiment; charge division; drift depth; gas electron multiplier based time projection chamber; laser electron gamma source; peak sensing circuit; position encoding; readout electronics; zigzag shaped anode pads; Anodes; Detectors; Electrons; Laser beams; Leg; Magnetic field measurement; Mesons; Neutrons; Optical polarization; Structural beams;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2005 IEEE
Print_ISBN :
0-7803-9221-3
DOI :
10.1109/NSSMIC.2005.1596405
