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Radiation resistant quadrupole mass analysers with the solid state electrometer amplifier and RF generator at the measuring head are not yet commercially available. Therefore an analyser able to accommodate a dose of 1.0 E8 rad without significant degradation had to be developed for use at JET. The design combines vacuum tubes, at the quadrupole head, with radiation sensitive components such as semiconductors located at the end of 100 m cables. The prototype analyser has been operated extensively on JET in order to assess its suitability for use during the main tritium phase. The testing has validated the precepts of the design, and with small design revisions, the performance is acceptable. Significantly, with the remote analyser, it is possible to obtain mass spectra of similar quality to those derived from a conventional Faraday cup quadrupole and to detect partial pressures in the 1.0 E-11 mbar range.

Additional information

Authors: PEARCE R, JET Joint Undertaking, Abingdon, Oxon. (GB);WINKEL T, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)69 EN (1992) 14 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199211252 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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