Speaker
Shikma Bressler
(Weizmann Institute of Science (IL))
Description
This work presents the experimental measurements obtained for UV-induced photo-electron extraction efficiency from a CsI photocathode into He with CF4 and CH4 gas mixtures. A 1000Å CsI photocathode was deposited on a gold plated THGEM for photo-electron conversion. Charge-gain measurements were obtained with a Single-THGEM detector operating in these gas mixtures using a UV lamp for the extraction of photo-electrons. Charge-gains in excess of 10^5 were obtained for gas mixtures containing percentages of quencher higher than 20% while photo-electron extraction efficiency was ~50% for He/CF4 and ~30% for He/ CH4. A discussion for future cryogenic applications is presented.
