Performance of a gas avalanche pixel detector of 50 μm pitch

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

Performance of a gas avalanche pixel detector of 50 μm pitch

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

Department of Materials Science and Engineering

Lawrence Berkeley National Laboratory

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We describe the performance of a square micro-dot (MDOT) detector of 50 μm pitch, in terms of defocussing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocussing effect disappeared in the 50 μm pitch MDOT. Initial charge build-up on the detector surface was also minimised when the small lateral dimension was combined with surface coating. The maximum gas gain was limited to approx. 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 approx. 400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size.

Original language	English
Title of host publication	IEEE Nuclear Science Symposium and Medical Imaging Conference
Publisher	IEEE
Pages	101-105
Number of pages	5
ISBN (Print)	0780350227
State	Published - 1999
Event	Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record - Toronto, Que, Can Duration: 8 Nov 1998 → 14 Nov 1998

Publication series

Name	IEEE Nuclear Science Symposium and Medical Imaging Conference
Volume	1

Conference

Conference	Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record
City	Toronto, Que, Can
Period	8/11/98 → 14/11/98

Cite this

@inproceedings{2dbe2b8964994d6ab66219dceb6e538c,

title = "Performance of a gas avalanche pixel detector of 50 μm pitch",

abstract = "We describe the performance of a square micro-dot (MDOT) detector of 50 μm pitch, in terms of defocussing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocussing effect disappeared in the 50 μm pitch MDOT. Initial charge build-up on the detector surface was also minimised when the small lateral dimension was combined with surface coating. The maximum gas gain was limited to approx. 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 approx. 400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size.",

author = "Hong, {W. S.} and Cho, {H. S.} and F. Retiere and S. Han and J. Kadyk and V. Perez-Mendez",

year = "1999",

language = "English",

isbn = "0780350227",

series = "IEEE Nuclear Science Symposium and Medical Imaging Conference",

publisher = "IEEE",

pages = "101--105",

booktitle = "IEEE Nuclear Science Symposium and Medical Imaging Conference",

note = "Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record ; Conference date: 08-11-1998 Through 14-11-1998",

}

Hong, WS, Cho, HS, Retiere, F, Han, S, Kadyk, J & Perez-Mendez, V 1999, Performance of a gas avalanche pixel detector of 50 μm pitch. in IEEE Nuclear Science Symposium and Medical Imaging Conference. IEEE Nuclear Science Symposium and Medical Imaging Conference, vol. 1, IEEE, pp. 101-105, Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record, Toronto, Que, Can, 8/11/98.

Performance of a gas avalanche pixel detector of 50 μm pitch. / Hong, W. S.; Cho, H. S.; Retiere, F. et al.
IEEE Nuclear Science Symposium and Medical Imaging Conference. IEEE, 1999. p. 101-105 (IEEE Nuclear Science Symposium and Medical Imaging Conference; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Performance of a gas avalanche pixel detector of 50 μm pitch

AU - Hong, W. S.

AU - Cho, H. S.

AU - Retiere, F.

AU - Han, S.

AU - Kadyk, J.

AU - Perez-Mendez, V.

PY - 1999

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N2 - We describe the performance of a square micro-dot (MDOT) detector of 50 μm pitch, in terms of defocussing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocussing effect disappeared in the 50 μm pitch MDOT. Initial charge build-up on the detector surface was also minimised when the small lateral dimension was combined with surface coating. The maximum gas gain was limited to approx. 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 approx. 400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size.

AB - We describe the performance of a square micro-dot (MDOT) detector of 50 μm pitch, in terms of defocussing effect and gas gain. Both the count rate variation measurement and the computer simulation showed that the defocussing effect disappeared in the 50 μm pitch MDOT. Initial charge build-up on the detector surface was also minimised when the small lateral dimension was combined with surface coating. The maximum gas gain was limited to approx. 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 approx. 400. This gain is expected to increase by increasing the spacer layer thickness and adjusting the hole size.

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M3 - Conference contribution

AN - SCOPUS:0032597395

SN - 0780350227

T3 - IEEE Nuclear Science Symposium and Medical Imaging Conference

SP - 101

EP - 105

BT - IEEE Nuclear Science Symposium and Medical Imaging Conference

PB - IEEE

T2 - Proceedings of the 1998 IEEE Nuclear Science Symposium Conference Record

Y2 - 8 November 1998 through 14 November 1998

ER -

Performance of a gas avalanche pixel detector of 50 μm pitch

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