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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

Micromegas; MediPix2; TPC; Single electron; Pixel; Pixel segmented anode

Electrical engineering, electronics and photonics

Elektroteknik, elektronik och fotonik

Publikations- och innehållstyp

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