Performance of a gas avalanche pixel detector of 50 μm pitch

Author

Hong, W.S. ; Cho, H.S. ; Retiere, F. ; Han, S. ; Kadyk, J. ; Perez-Mendez, V.

Author_Institution

Div. of Eng., Lawrence Berkeley Nat. Lab., CA, USA

Volume

47

Issue

6

fYear

2000

fDate

12/1/2000 12:00:00 AM

Firstpage

2065

Lastpage

2069

Abstract

We describe the performance of a square microdot (MDOT) detector of 50 μm pitch, in terms of defocusing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocusing effect disappeared in the 50 μm pitch MDOT. Initial charge buildup on the detector surface was also minimized when the small lateral dimension was combined with surface coating. The maximum gas gain was limited to ~1200 due to the small distance available for avalanche multiplication. We also developed a two-level microdot, namely closed-end gas electron multiplication (CEGEM) chamber. A CEGEM detector having a pitch of 200 μm, holes of 40 μm width and a spacer layer of 18.5 μm thickness showed a maximum gain of ~400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size

Keywords

position sensitive particle detectors; proportional counters; 50 mum; avalanche multiplication; closed-end gas electron multiplication chamber; computer simulation; count rate variation measurement; defocusing effect; gas avalanche pixel detector; gas gain; initial charge buildup; square microdot detector; surface coating; two-level microdot; Anodes; Cathodes; Circuit testing; Conductivity; Detectors; Fabrication; Plasma applications; Plasma temperature; Radio frequency; Wafer bonding;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.903848

Filename

903848