dorsal/arxiv
View SchemaSporadic electron jets from cathodes - The main breakdown-triggering mechanism in gaseous detectors
| Authors | C. Iacobaeus, M. Danielsson, P. Fonte, T. Francke, J. Ostling, V. Peskov |
|---|---|
| Categories | |
| ArXiv ID | physics/0112013 |
| URL | https://arxiv.org/abs/physics/0112013 |
| DOI | 10.1109/NSSMIC.2001.1008512 |
Abstract
We have demonstrated experimentally that the main breakdown-triggering mechanism in most gaseous detectors, including micropattern gaseous detectors, is sporadic electron jets from the cathode surfaces. Depending on conditions, each jet contains randomly from a few primary electrons up to 10^5, emitted in a time interval ranging between 0.1 microsecond to milliseconds. After the emission, these primary electrons experience a full gas multiplication in the detector and create spurious pulses. The rate of these jets increases with applied voltage and very sharply at voltages close to the breakdown limit. We found that these jets are in our measurements responsible for the breakdown-triggering at any counting rate between 10^(-2) Hz/mm^2 and 10^8 Hz/mm^2. We demonstrated on a few detectors that an optimized cathode-geometry, a high electrode surface quality and a proper choice of the gas mixture, considerably improve the performance characteristics and provide the highest possible gains.
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"abstract": "We have demonstrated experimentally that the main breakdown-triggering\nmechanism in most gaseous detectors, including micropattern gaseous detectors,\nis sporadic electron jets from the cathode surfaces.\n Depending on conditions, each jet contains randomly from a few primary\nelectrons up to 10^5, emitted in a time interval ranging between 0.1\nmicrosecond to milliseconds. After the emission, these primary electrons\nexperience a full gas multiplication in the detector and create spurious\npulses.\n The rate of these jets increases with applied voltage and very sharply at\nvoltages close to the breakdown limit. We found that these jets are in our\nmeasurements responsible for the breakdown-triggering at any counting rate\nbetween 10^(-2) Hz/mm^2 and 10^8 Hz/mm^2. We demonstrated on a few detectors\nthat an optimized cathode-geometry, a high electrode surface quality and a\nproper choice of the gas mixture, considerably improve the performance\ncharacteristics and provide the highest possible gains.",
"arxiv_id": "physics/0112013",
"authors": [
"C. Iacobaeus",
"M. Danielsson",
"P. Fonte",
"T. Francke",
"J. Ostling",
"V. Peskov"
],
"categories": [
"physics.ins-det",
"physics.med-ph"
],
"doi": "10.1109/NSSMIC.2001.1008512",
"title": "Sporadic electron jets from cathodes - The main breakdown-triggering mechanism in gaseous detectors",
"url": "https://arxiv.org/abs/physics/0112013"
},
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