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Detector Seminar
New micropattern spark-protected gaseous detectors and applications to High Energy Physics and Medicine
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Europe/Zurich
13/2-005 (CERN)
Description
Recently developed micropattern gaseous detectors open new avenues in the detector technology. However, due to the fine structure of their electrodes, these detectors are quite fragile and can be damaged by sparks.
We will present the results of our efforts to develop a more robust version of micropattern detectors. Our first successful prototype was a microgap resistive plate chamber; this detector, achieving a position resolution of 50 μm, could operate at high counting rates and at the same time was spark protected. It was successfully used for medical imaging purposes.
During the last year the ICARUS and ALICE HMPID groups succeeded to extend the resistive layer approach to other types of micropattern gaseous detectors including GEM-like one. In all cases the resistive coatings made detectors robust and reliable in operation. We demonstrated that the resistive cathodes of these detectors can be coated with CsI or SbCs photosensitive layers and the quantum efficiency of these photocathodes was high enough and stable in time. This may open new possibilities for the detection of UV and visible photons, for example for RICH or noble liquid TPCs applications. We have built and tested a detector prototype based on this technology demonstrating that the resistive electrode detectors can stably operate at cryogenic temperatures and we already used it for the detection of scintillation light from condensed noble gases. Finally, we will show some x-rays and UV digital images obtained with these detectors.
Organiser(s): Ariella Cattai / EP
We will present the results of our efforts to develop a more robust version of micropattern detectors. Our first successful prototype was a microgap resistive plate chamber; this detector, achieving a position resolution of 50 μm, could operate at high counting rates and at the same time was spark protected. It was successfully used for medical imaging purposes.
During the last year the ICARUS and ALICE HMPID groups succeeded to extend the resistive layer approach to other types of micropattern gaseous detectors including GEM-like one. In all cases the resistive coatings made detectors robust and reliable in operation. We demonstrated that the resistive cathodes of these detectors can be coated with CsI or SbCs photosensitive layers and the quantum efficiency of these photocathodes was high enough and stable in time. This may open new possibilities for the detection of UV and visible photons, for example for RICH or noble liquid TPCs applications. We have built and tested a detector prototype based on this technology demonstrating that the resistive electrode detectors can stably operate at cryogenic temperatures and we already used it for the detection of scintillation light from condensed noble gases. Finally, we will show some x-rays and UV digital images obtained with these detectors.
Organiser(s): Ariella Cattai / EP