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Dedicated experiments on the Joint European Torus (JET) clarified the effect of the toroidal field reversal on divertor asymmetries. In high recycling L-mode discharges the field reversal had a significant impact on density, temperature, radiated power, particle flux and H(alpha) emission distribution between the strike zones. The in/out ratio of j (Sat), n(e), P(rad) and H(alpha) emission was reduced following the change from normal to reversed field configuration, while the T(e) in/out asymmetry was increased. Significantly weaker effect of the field reversal on the asymmetries was observed in high density Ohmic discharges. In the L-mode series of discharges with reversed field, the previously reported q-dependence of power sharing between the strike zones, with more symmetric power deposition at low q(95) was validated. The shifts in the power asymmetry between the targets due to the field reversal agrees with previous observations on JET and elsewhere that power distribution between the sides is more symmetric in the reversed toroidal field.

Additional information

Authors: CHANKIN A V ET AL, JET Joint Undertaking, Abingdon, Oxon. (GB);MONK R D, University of London, Royal Holloway College (GB);STANGEBY P C, University of Toronto, Institute for Aerospace Studies (CA)
Bibliographic Reference: Report: JET-P(96)05 EN (1996) 17pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199610688 / Last updated on: 1996-06-21
Original language: en
Available languages: en
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