Speaker
Vladimir Peskov
(KTH Stockholm)
Description
Recently developed micropattern gaseous detectors open new avenues in the
detectors technology. However, due to the fine structure of their electrodes,
these detectors are quite fragile and can be damaged by sparks. We have
developed and successfully tested several prototypes of micropattern gaseous
detectors based on a new design in which the cathode or the anode (in some
case both of the electrodes) are coated by thin or thick resistive layers. These
resistive coatings protect the detector and the front-end electronics in the case
of sparks and thus make the detectors more robust and reliable. For example,
an array of anode micropins each positioned in the centre of the microholes
drilled in a thin resistive cathodes plate could operate either in proportional
mode (at gains of up to 105 ) or in a streamer mode with an efficiency close to
100% for detection of x-ray photons.
We also investigated the possible application of such detectors combined with
CsI photocathodes to the detection of UV photons. The results of systematic
studies of the characteristics of these detectors including rate capability and
a long-term stability under the harsh conditions will be presented.
Finally, we will present the first results of their applications to high energy
physic and X-ray imaging.
Author
Vladimir Peskov
(KTH Stockholm)
