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Abstract

A Time of Flight (TOF) Neutral Particle Analyser (NPA) has recently been installed at JET. The operation of the previous system (KR1) was heavily affected by the neutron induced background noise. The new system (KR2) consists of a single NPA, based on the measurement of the time of flight of the particles, so that a random background can be discriminated by a standard coincidence technique. The analyser energy range is 0.5-200 keV and it has been absolutely calibrated for hydrogen, deuterium and helium neutrals. Results obtained with the new TOF NPA in various JET plasma scenarios are presented. Some of the results have been obtained in plasmas producing a high neutron induced background, thus demonstrating the random noise rejection capability of the analyser. A neutron shielding of a factor of 100 is still needed for operation in the D-T phase.

Additional information

Authors: BRACCO G, ENEA, Centro Ricerche Energia Frascati, Roma (IT);MOLETI A, ENEA, Centro Ricerche Energia Frascati, Roma (IT);TILIA B, ENEA, Centro Ricerche Energia Frascati, Roma (IT);ZANZA V, ENEA, Centro Ricerche Energia Frascati, Roma (IT);BONNERUE J L, JET Joint Undertaking, Abingdon, Oxon. (GB);CORTI S, JET Joint Undertaking, Abingdon, Oxon. (GB);CLARKE H, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(91)02 EN (1991) 26 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199111185 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en