Title :
A study of a combination of MICROMEGAS + GEM chamber in Ar-CO2 gas
Author :
Kane, S. ; May, J. ; Miyamoto, J. ; Shipsey, I. ; Giomataris, I.
Author_Institution :
Dept. of Phys., Purdue Univ., West Lafayette, IN, USA
Abstract :
A MICROMEGAS is a micropatterned gaseous detector that has great potential in many applications including high energy physics and astronomy. The detector consists of a micromesh supported by thin pillars (50 μm) and the space between the micromesh and the anode plane defines an amplification gap. The detector has a high rate capability and good spatial resolution. The performance of the MICROMEGAS can be improved by adding a preamplification device like a GEM to factor the gas multiplication into two stages. With the added preamplification, it is possible to minimize spark rates in detecting heavily ionizing particles without sacrificing gas gain significantly. The additional gas gain provided by the GEM also allows the detector to operate in a clean gas mixture like Ar-CO2. The use of a clean gas mixture allows the device to be radiation hard.
Keywords :
amplification; electron multiplier detectors; ionisation chambers; position sensitive particle detectors; Ar-CO2; MICROMEGAS; gas electron multiplier; gas gain; micromesh; spark rates; spatial resolution; Anodes; Astronomy; Detectors; Electrons; Etching; Lithography; Physics; Preamplifiers; Sparks; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2001 IEEE
Print_ISBN :
0-7803-7324-3
DOI :
10.1109/NSSMIC.2001.1008455
