Abstract
A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed 50micrometer 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 ?-rays.
Original language | English |
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Pages (from-to) | 295-304 |
Number of pages | 10 |
Journal | Nuclear instruments & methods in physics research. Section A : Accelerators, spectrometers, detectors and associated equipment |
Volume | 540 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 21 Mar 2005 |
Keywords
- MediPix2
- MICROMEGAS
- TPC
- Pixel
- IR-67702
- EWI-15496
- Single electron