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Single electron Response and Energy Resolution of a Micromegas Detector
Lepeltier V., Genolini B., Pouthas J., Zerguerras T.
2007 Nuclear Science Symposium and Medical Imaging Conference (2007 NSS/MIC), Honolulu : États-Unis (2007) - http://hal.in2p3.fr/in2p3-00280010
Physique/Physique/Instrumentations et Détecteurs
Single electron Response and Energy Resolution of a Micromegas Detector
V. Lepeltier ()1, B. Genolini2, J. Pouthas2, T. Zerguerras2
1 :  LAL - Laboratoire de l'Accélérateur Linéaire
http://www.lal.in2p3.fr/
CNRS : UMR8607 – IN2P3 – Université Paris XI - Paris Sud
Centre Scientifique d'Orsay B.P. 34 91898 ORSAY Cedex
France
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
In gaseous detectors, spatial and energy resolutions are limited by the gain fluctuations. We have measured the single electron response of a Micromegas detector and also its energy resolution as a function of the number of electrons by means of a point-like electron source. A pulsed nitrogen UV laser is focused on the drift electrode made of a thin metal layer deposited on a quartz lamina, creating with an accuracy of 1 micron a spot of an adjustable and well known number of photoelectrons, with a transverse size smaller than 100 microns. With a drift distance of 3 mm, and a Ne-isobutane (90-10%) gas mixture the transverse diffusion is 200 microns rms. The avalanche in the multiplication gap induces charge on the anode made of 128 strips with a 338 microns pitch. For the single electron measurements, the total number of electrons is about 150, in such a way that the corresponding number of electrons contributing to a signal on a strip located at a transverse distance of 4-5 standard deviations from the spot is never greater than one.

Communications sans actes
28/10/2007

2007 Nuclear Science Symposium and Medical Imaging Conference (2007 NSS/MIC)
Honolulu
États-Unis
27/10/2007
03/11/2007
V. Lepeltier

LAL 07-254