Slotted-electron-sieve integrated photosensor for gas-proportional scintillation counters

Details Slotted-electron-sieve integrated photosensor for gas-proportional scintillation counters Slotted-electron-sieve integrated photosensor for gas-proportional scintillation counters

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3445..623l&link_type=abstract

Proc. SPIE Vol. 3445, p. 623-629, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IX, Oswald H. Siegmund; Mark A. Gummin

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The performance of a new slotted electron sieve design in an integrated photo-sensor for use in xenon gas proportional scintillation detectors is described. The new design exhibits an enhanced photoelectron collection when compared to the earlier circular holes design, used for the first time in such application. The present design uses an electron sieve composed of a 50-micrometers pitch. The front surface is made photosensitive with a 150-thick CsI film. When an appropriate voltage is applied between the copper electrodes, the resulting electric field directs photoelectrons produced on the front surface through the holes in the sieve and onto a wire chamber where charge amplification occurs. Positive feedback is essentially eliminated since the charge amplification stage is optically decoupled from the photo-cathode. The electron sieve also provides a small amount of charge gain up to 2.8. The measured effective quantum efficiency, namely the number of photoelectrons traversing the electron sieve holes per incident 170-nm scintillation photon, as measured under present conditions, is about 8.3 percent. A discussion of the results is presented.

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