Author/Authors :
Derré، نويسنده , , J and Giomataris، نويسنده , , Y and Rebourgeard، نويسنده , , Ph and Zaccone، نويسنده , , H and Perroud، نويسنده , , J.P. and Charpak، نويسنده , , G، نويسنده ,
Abstract :
The performance of a new gaseous photodetector was investigated. It consists of a solid photocathode and a gas amplification structure of the MICROMEGAS type. Using a mixture of helium and isobutane at atmospheric pressure, a stable and high amplification gain close to 107 was achieved. Such a high gain and small fluctuations allowed the detection of single photoelectrons with a time resolution better than 700 ps. These performances are comparable with those obtained with the best photomultipliers.
