Thermal and nonthermal electron cyclotron emission by high-temperature tokamak plasmas (Articolo in rivista)

Type
Label
  • Thermal and nonthermal electron cyclotron emission by high-temperature tokamak plasmas (Articolo in rivista) (literal)
Anno
  • 1997-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.1147618 (literal)
Alternative label
  • A. Airoldi; G. Ramponi (1997)
    Thermal and nonthermal electron cyclotron emission by high-temperature tokamak plasmas
    in Review of scientific instruments
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. Airoldi; G. Ramponi (literal)
Pagina inizio
  • 509 (literal)
Pagina fine
  • 512 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://rsi.aip.org/resource/1/rsinak/v68/i1/p509_s1 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 68 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • IFP-CNR, Assoc. EURATOM-ENEA-CNR, Via Bassini 15, 20133 Milano, Italy (literal)
Titolo
  • Thermal and nonthermal electron cyclotron emission by high-temperature tokamak plasmas (literal)
Abstract
  • An analysis of the electron cyclotron emission (ECE) spectra emitted by a high-temperature tokamak plasma in the frequency range of the second and third harmonic of the electron cyclotron frequency is made, both in purely Maxwellian and in non-Maxwellian cases (i.e., in the presence of a current-carrying superthermal tail). The work is motivated mainly by the experimental observations made in the supershot plasmas of the Tokamak Fusion Test Reactor (TFTR), where a systematic disagreement is found between the T-e measurements by second-harmonic ECE and Thomson scattering. We show that, by properly taking into account the overlap of superthermals-emitted third harmonic with second-harmonic bulk emission, the radiation temperature observed about the central frequency of the second harmonic may be enhanced up to 30%-40% compared to the corresponding thermal value. Moreover we show that, for parameters relevant to the International Thermonuclear Experimental Reactor (ITER) with T-e(0) > 7 keV, the overlap between the second and the downshifted third harmonic seriously affects the central plasma region, so that the X-mode emission at the second harmonic becomes unsuitable for local T-e measurements. (C) 1997 American Institute of Physics. (literal)
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