6533b7ddfe1ef96bd127475e
RESEARCH PRODUCT
CEMS of insulators by use of gas-flow counters
W. Meiselsubject
Nuclear and High Energy PhysicsMaterials sciencebusiness.industrySample (material)DetectorAnalytical chemistryCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCathodelaw.inventionAnodeSurface conductivitylawElectric fieldOptoelectronicsPhysical and Theoretical ChemistrybusinessVoltage dropVoltagedescription
Gas-flow CEMS counters are usually designed in such a manner that the sample to be investigated is inserted into the counter and serves as the backing cathode. If the sample consists of an insulating material, serious problems are expected by charging-up effects similar to those appearing in Maze counters. These problems are discussed in detail. It could be shown by experiments with glass samples that their very low surface conductivity is sufficient to allow a defined operation of such gas-flow CEMS detectors. The electric field strength between the surface of the sample and the anode has to be equal or higher than that between the entrance window and the anode. This can be ensured by an appropriate design of the counter and an excess voltage applied to compensate for the potential drop across the insulating sample.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-12-01 | Hyperfine Interactions |