Detection of single electrons by means of a Micromegas-covered Medipix2 pixel CMOS readout circuit

A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed above the chip, and electron multiplication occurred in the gap. With a He/isobutane 80/20 mixture, gas multiplication factors up to tens of thousands were achieved, resulting in an efficiency for detecting single electrons of better than 90%. We recorded many frames containing 2D images with tracks from cosmic muons. Along these tracks, electron clusters were observed, as well as δ-rays.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Micromegas; MediPix2; TPC; Single electron; Pixel; Pixel segmented anode
Electrical engineering, electronics and photonics
Elektroteknik, elektronik och fotonik

Chefdeville, M (author)
Colas, P (author)
Colijn, A P (author)
Fornaini, A (author)
Giomataris, Y (author)
van der Graaf, H (author)
Heijne, E H M (author)
Kluit, P (author)
Llopart Cudié, XavierCERN/MediPix Consortium, Geneva, Switzerland(Swepub:miun)exxavll (author)
Schmitz, J (author)
Timmermans, J (author)
Visschers, J L (author)
CERN/MediPix Consortium, Geneva, Switzerland (creator_code:org_t)

In:Nuclear Instruments and Methods in Physics Research Section A: Elsevier BV540:2-3, s. 295-3040168-90021872-9576

By the author/editor: Campbell, M; Chefdeville, M; Colas, P; Colijn, A P; Fornaini, A; Giomataris, Y; show more...; van der Graaf, H; Heijne, E H M; Kluit, P; Llopart Cudié, X ...; Schmitz, J; Timmermans, J; Visschers, J L; show less...

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