Title :
Electron collection and ion feedback in GEM-based detectors
Author :
Sauli, Fabio ; Kappler, Steffen ; Ropelewski, Leszek
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
We report the results of systematic experimental investigations on electron transparency and ions feedback in a single GEM detector for the operating region close to unitary gain. Critical factors for obtaining good collection are the transverse diffusion coefficient and the holes´ diameter. A unit gain GEM can be used for instance as first element in a cascade to improve collection efficiency and ion feedback suppression in Time Projection Chambers.
Keywords :
X-ray detection; time projection chambers; GEM-based detectors; electron collection; electron transparency; ion feedback; time projection chambers; transverse diffusion coefficient; unitary gain; Assembly; Current measurement; Detectors; Electrodes; Electrons; Feedback; Gain measurement; Ionization; Magnetic field measurement; Voltage;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2002 IEEE
Print_ISBN :
0-7803-7636-6
DOI :
10.1109/NSSMIC.2002.1239316
