Physics – Instrumentation and Detectors
Scientific paper
2009-01-19
Nucl.Instrum.Meth.A608:397-402,2009
Physics
Instrumentation and Detectors
Preprint submitted to Nuclear Instrumentation and Methods in Physics Research Section A: Accelerators, Spectrometers, Detector
Scientific paper
10.1016/j.nima.2009.07.015
Micro-Pattern Gaseous Detectors (MPGDs) such as Micromegas or GEM are used in particle physics experiments for their capabilities in particle tracking at high rates. Their excellent position resolutions are well known but their energy characteristics have been less studied. The energy resolution is mainly affected by the ionisation processes and detector gain fluctuations. This paper presents a method to separetely measure those two contributions to the energy resolution of a Micromegas detector. The method relies on the injection of a controlled number of electrons. The Micromegas has a 1.6-mm drift zone and a 160-$\mu$m amplification gap. It is operated in Ne 95%-iC$\mathrm{_4}$H$\mathrm{_{10}}$ 5% at atmospheric pressure. The electrons are generated by non-linear photoelectric emission issued from the photons of a pulsed 337-nm wavelength laser coupled to a focusing system. The single electron response has been measured at different gains (3.7 10$\mathrm{^4}$, 5.0 10$\mathrm{^4}$ and 7.0 10$\mathrm{^4}$) and is fitted with a good agreement by a Polya distribution. From those fits, a relative gain variance of 0.31$\pm$0.02 is deduced. The setup has also been characterised at several voltages by fitting the energy resolution measured as a function of the number of primary electrons, ranging from 5 up to 210. A maximum value of the Fano factor (0.37) has been estimated for a 5.9 keV X-rays interacting in the Ne 95%-iC$\mathrm{_4}$H$\mathrm{_{10}}$ 5% gas mixture.
Genolini B.
Lepeltier V.
Peyre J.
Pouthas J.
Rosier P.
No associations
LandOfFree
Single electron response and energy resolution of a Micromegas detector does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Single electron response and energy resolution of a Micromegas detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single electron response and energy resolution of a Micromegas detector will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-566831