18-22 February 2019
Vienna University of Technology
Europe/Vienna timezone

NONINVASIVE METHOD OF RECOVERY OF GAS PARTICLE DETECTORS UNDER OPERATION IN HIGH-INTENSITY FIELDS OF RADIATION

Not scheduled
15m
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Board: 15
Poster Gaseous Detectors Poster Session B

Speaker

Prof. Anatoly Krivshich

Description

Aging effects result in a surface degradation of both the anode and cathode electrodes, which occur in different forms. Anode type of aging is associated with silicon deposits formed on the surface of the anode wires. This effect is manifested even with small accumulated charges in the range of (0.1–1.0) Coulomb per cm of the anode wire length. If there would be no silicon contamination in the detector, it could operate at higher doses with the accumulated charge exceeding 1 Coulomb/cm. In this case, the main mechanism of aging would be swelling of the wire caused by chemical interaction of the oxygen, which is coming from the gas avalanche, with the tungsten that is the main material of the anode wire. Cathode aging is associated with formation of dielectric films at the cathode, which usually cause the Malter effect. We describe a method of noninvasive recovery of gas-discharge detectors, which have been degraded due to operation in intense radiation fields, by cleaning the cathode and anode wire surface from organic compounds, silicon, and tungsten compositions (swelling effects). It has been shown that the method of plasma-chemical etching in a gas discharge increases the detector lifetime in several times. Recovery of the main technical characteristics of the detector after its aging without disassembling and repairing is actual for many physical experiments, since the development of a detector operating with an accumulated charge of about 10–20 C/cm is still a problem.

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