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The JET neutron emission profile monitor is used to measure the 2.5 MeV and 14 MeV neutron emission line integrals before and after sawtooth crashes in high d-d neutron yield, hot ion H-mode plasmas in JET. A study of the response of beam-injected deuterium ions to a sawtooth crash shows that the change in their axial density depends on the pre-crash spatial width of the neutron emissivity profile. Fusion product tritons respond weakly to a crash. This is consistent with the behaviour of the analogous d-d beam-thermal neutrons when extrapolated to the corresponding emissivity spatial width. The implication of these observations is that beam ions and 3.5 MeV alpha-particles in JET may be relatively resilient to sawtooth crashes, when the spatial width of their density is sufficiently large.

Additional information

Authors: MARCUS F B ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);ADAMS J M ET AL., AEA Technology, Harwell Laboratory, Didcot, Oxon. (GB);HOWARTH P J A, University of Birmingham (GB)
Bibliographic Reference: Report: JET-P(93)97 EN (1993)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199311638 / Last updated on: 1994-11-28
Original language: en
Available languages: en