Year: 2011
Type: conference-paper
Abstract: A Time-Projection-Chamber (TPC) allows high-precision 3-dimensional tracking of charged particles in large volumes together with excellent particle identification capabilities.Up to now it was not possible to operate a TPC in a continuous mode due to back drifting secondary ions from the amplification stage.We want to overcome this limitation by using GEM foils for the amplification taking advantage of the intrinsic ion backflow suppression of the GEM foils.Such a continuously readout TPC is one option for the inner tracker of the future PANDA experiment which will be built at the new Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany.To verify the feasibility of this solution, a prototype detector with a diameter of 300 mm and a drift length of 730 mm was built and tested inside the FOPI at GSI for the first time in November 2010.The charge signal is amplified by a triple GEM stack and detected by 10254 pads of hexagonal shape with an outer diameter of 1.5 mm.The hexagonal shape of the readout pads is expected to provide a more uniform charge distribution across the pads.The readout of the TPC is realized by an analog sampling of the signal with the AFTER chip [5], and subsequent digitization by a pipelined ADC.
DOI: 10.22323/1.135.0020
Author: Martin Berger
Institution: Technical University of Munich
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W1663047727