Double-hit separation and dE/dx resolution of a time projection chamber with GEM readout
physics.ins-det
/ Authors
Yumi Aoki, David Attié, Ties Behnke, Alain Bellerive, Oleg Bezshyyko, Deb Bhattacharya Sankar, Purba Bhattacharya, Sudeb Bhattacharya, Yue Chang, Paul Colas
and 61 more authors
Gilles De Lentdecker, Klaus Dehmelt, Klaus Desch, Ralf Diener, Madhu Dixit, Ulrich Einhaus, Oleksiy Fedorchuk, Ivor Fleck, Keisuke Fujii, Takahiro Fusayasu, Serguei Ganjour, Philippe Gros, Peter Hayman, Katsumasa Ikematsu, Leif Jönsson, Jochen Kaminski, Yukihiro Kato, Claus Kleinwort, Peter Kluit Martin, Makoto Kobayashi, Uwe Krämer, Björn Lundberg, Michael Lupberger
/ Abstract
A time projection chamber (TPC) with micropattern gaseous detector (MPGD) readout is investigated as main tracking device of the International Large Detector (ILD) concept at the planned International Linear Collider (ILC). A prototype TPC equipped with a triple gas electron multiplier (GEM) readout has been built and operated in an electron test beam. The TPC was placed in a 1 T solenoidal field at the DESY II Test Beam Facility, which provides an electron beam up to 6 GeV/c. The performance of the readout modules, in particular the spatial point resolution, is determined and compared to earlier tests. New studies are presented with first results on the separation of close-by tracks and the capability of the system to measure the specific energy loss dE/dx. This is complemented by a simulation study on the optimization of the readout granularity to improve particle identification by dE/dx.