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Localized bulk electron heating with ICRF mode conversion in the JET tokamak
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2004 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 44, no 1, 33-46 p.Article in journal (Refereed) Published
Abstract [en]

Ion cyclotron resonance frequencies (ICRF) mode conversion has been developed for localized on-axis and off-axis bulk electron heating on the JET tokamak. The fast magnetosonic waves launched from the low-field side ICRF antennas are mode-converted to short-wavelength waves on the high-field side of the He-3 ion cyclotron resonance layer in D and He-4 plasmas and subsequently damped on the bulk electrons. The resulting electron power deposition, measured using ICRF power modulation, is narrow with a typical full-width at half-maximum of approximate to30 cm (i.e. about 30% of the minor radius) and the total deposited power to electrons comprises at least up to 80% of the applied ICRF power. The ICRF mode conversion power deposition has been kept constant using He-3 bleed throughout the ICRF phase with a typical duration of 4-6 s, i.e. 15-40 energy confinement times. Using waves propagating in the counter-current direction minimizes competing ion damping in the presence of co-injected deuterium beam ions.

Place, publisher, year, edition, pages
2004. Vol. 44, no 1, 33-46 p.
Keyword [en]
ion-bernstein waves, fusion test reactor, alcator c-mod, cyclotron range, current drive, hybrid resonances, toroidal plasmas, tftr, frequency, transport
URN: urn:nbn:se:kth:diva-23128DOI: 10.1088/0029-5515/44/1/004ISI: 000188596800005OAI: diva2:341826
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Hellsten, Torbjörn A. K.Rachlew, Elisabeth
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Alfvén LaboratoryPhysics
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