The detection of single electrons by means of a Micromegas-covered MediPix2 pixel CMOS readout circuit

The detection of single electrons by means of a Micromegas-covered MediPix2 pixel CMOS readout circuit
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DOI：
10.1016/j.nima.2004.11.036
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发表时间：
2004-09
期刊：
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
影响因子：
1.4
通讯作者：
M. Campbell;M. Chefdeville;P. Colas;A. Colijn;A. Fornaini;Y. Giomataris;H. Graaf;E. Heijne;P. Kluit;X. Llopart;Jurriaan Schmitz;J. Timmermans;J. Visschers
M. Campbell;M. Chefdeville;P. Colas;A. Colijn;A. Fornaini;Y. Giomataris;H. Graaf;E. Heijne;P. Kluit;X. Llopart;Jurriaan Schmitz;J. Timmermans;J. Visschers
中科院分区：
物理与天体物理3区
文献类型：
--
作者：
M. Campbell;M. Chefdeville;P. Colas;A. Colijn;A. Fornaini;Y. Giomataris;H. Graaf;E. Heijne;P. Kluit;X. Llopart;Jurriaan Schmitz;J. Timmermans;J. Visschers

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通过MediPix 2读出芯片作为直接阳极读出小漂移室。将Micromegas箔放置在芯片上方50μm处，并且在差距中发生电子倍增。使用He/异丁烷80/20混合物，实现了高达数万的气体倍增因子，导致检测单个电子的效率优于90%。我们记录了许多帧包含2D图像的宇宙μ子轨道。沿着这些轨迹，观察到电子团簇，以及δ射线。
A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed 50μm 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.