Optimization of anode dimensions for microgap detectors at high pressure

Author

Fraga, F.A.F. ; Marques, Ferreira R. ; Ivaniouchenkov, I. ; Margato, L.M.S. ; Goncalo, J.R. ; Policarpo, A.J.P.L. ; van Eijk, C.W.E. ; Hollander, R.W. ; Van Der Marel, J.

Author_Institution

Dept. de Fisica, Coimbra Univ., Portugal

Volume

45

Issue

3

fYear

1998

fDate

6/1/1998 12:00:00 AM

Firstpage

269

Lastpage

274

Abstract

The possibility of using microgap structures in pressurized gaseous devices for high rate synchrotron radiation detectors has been presented before; one of their main drawbacks is the limited maximum safe gain at which they can be operated. In this study we present data on the performance of microgap plates with several widths of the anodes (4 to 12 micron) and of the insulating layer (6 to 30 micron). Krypton and xenon based gaseous mixtures were used at pressures of 1, 3 and 6 bar under irradiation by ⁵⁵Fe and ¹⁰⁹Cd X-ray sources and an X-ray tube. The dependence of gain on anode voltage is analyzed, as well as the effects of drift field on gain and charge collection. We also present data on the measured safe maximum gain before breakdown versus count rate

Keywords

amplification; anodes; ionisation chambers; Kr; X-ray; Xe; anode dimensions; anode voltage; breakdown; charge collection; count rate; drift field; gain; high pressure; microgap detectors; microgap plates; synchrotron radiation detectors; Anodes; Cathodes; Current measurement; Detectors; Gain measurement; Insulation; Pulse amplifiers; Pulse measurements; Synchrotron radiation; Voltage;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.682392

Filename

682392