Total radiation losses and emissivity profiles in RFX

L. Marrelli, P. Martin, A. Murari, G. Spizzo

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Abstract

In the framework of adding new information to the reversed field pinch (RFP) confinement database, the radiation emitted by RFX plasmas has been investigated using an eight chord bolometric camera, whose detectors have been calibrated absolutely. From the experimental data the emissivity profiles have been reconstructed by means of a generalized tomography reconstruction algorithm. This analysis confirms that the radiation emitted in RFX is systematically concentrated at the edge. The dependence of the emitted power on the plasma density shows that the radiation increases approaching the high density regime, but it rarely goes beyond 30% of the input power for stationary discharges. This behaviour is strongly dependent on the concentration of impurities but, in any case, in RFX there is no evidence of disruptions. A simple local energy balance allows a preliminary evaluation of the radial heat flux profile to be obtained. These measurements indicate that an active impurity screening mechanism is acting in the edge and that transport is the major energy loss mechanism in RFX.
Original languageEnglish
Pages (from-to)649 - 659
Number of pages11
JournalNuclear Fusion
Volume38
Issue number5
DOIs
Publication statusPublished - 1998
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Marrelli, L., Martin, P., Murari, A., & Spizzo, G. (1998). Total radiation losses and emissivity profiles in RFX. Nuclear Fusion, 38(5), 649 - 659. https://doi.org/10.1088/0029-5515/38/5/301