ICFA Instrumentation Bulletin, Volume 16, Summer 1998 Issue (SLAC-J-ICFA-016)

Technical Report · Mon Oct 20 04:00:00 EDT 2003

DOI:https://doi.org/10.2172/826475· OSTI ID:826475

Va'Vra, J ^[1]

---

1. SLAC

The authors developed a very low resistivity RPC-type detector, the anode of which was a plate made from materials with resistivity up to 5 x 10{sup 7} {Omega}cm, the cathode being a metallic mesh preceded by a drift region. In such a detector it was actually possible to combine the versatility and high counting-rate capability of metallic PPACs with the extreme robustness and protectiveness of Resistive Plate Chambers. Occasional discharges triggered by large deposits of primary ionization or by extreme counting rates are quenched by the resistive anode and are constrained to the glow discharge phase of the sparking process. The study shows that this discharge affects the detector only locally and the charge released is limited to a few tons of nC. Proportional counting rates of up to 10{sup 5} Hz/mm{sup 2} were achieved at gains above 10{sup 4}. The energy resolution at 6 keV was 20% FWHM. The observed gain-rate trade-off is well-described by an analytic mode, and further improvements may be expected by lowered the resistivity of the anode material. The properties of several custom-made, controllable resistivity, anode materials are described and perspectives of improvement in the performance of the detector are discussed.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 826475
• Report Number(s): SLAC-R-647
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANODES
CATHODES
COUNTING RATES
ELECTRIC CONDUCTIVITY
ENERGY RESOLUTION
GLOW DISCHARGES
IONIZATION
PERFORMANCE
RADIATION DETECTORS