Impact of W events and dust on JET-ILW operation

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • M. Sertoli
  • J. C. Flanagan
  • M. Bacharis
  • O. Kardaun
  • A. Jarvinen
  • G. F. Matthews
  • S. Brezinsek
  • D. Harting
  • A. Cackett
  • E. Hodille
  • I. H. Coffey
  • E. Lazzaro
  • T. Pütterich

Research units

  • Max-Planck-Institut für Plasmaphysik
  • Imperial College London
  • Queen's University Belfast
  • Culham Science Centre
  • Jülich Research Centre
  • Istituto di Fisica del Plasma (CNR)

Abstract

The occurrence of transient impurity events (TIE) leading to intense radiation spikes in JET plasma discharges has been studied since the installation of the ITER-like wall (ILW). To generate the observed average increase in radiated power of 1.5 MW, a spherical particle of solid W of radius >90 μm would be required. The drop in plasma energy caused by W-TIEs is fully recovered in 90% of all cases, only 1% inducing a longer term loss in plasma energy which sometimes leads to the shut-down of plasma operation. TIEs are correlated with disruptions and with measurements of the dust mobilized by disruptions using the high resolution Thomson scattering (HRTS) diagnostic. The dust characteristics giving rise to TIEs have been studied using the dust transport code DTOKS and the 1D impurity transport code STRAHL.

Details

Original languageEnglish
Article number48764
Pages (from-to)837-841
Number of pages5
JournalJournal of Nuclear Materials
Volume463
Publication statusPublished - 22 Jul 2015
MoE publication typeA1 Journal article-refereed

ID: 9775263