Impact of W events and dust on JET-ILW operation

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

doi:10.1016/j.jnucmat.2014.12.033

Impact of W events and dust on JET-ILW operation

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

^*Corresponding author for this work

Department of Applied Physics

Research output: Contribution to journal › Article › Scientific › peer-review

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.

Original language	English
Article number	48764
Pages (from-to)	837-841
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.12.033
Publication status	Published - 22 Jul 2015
MoE publication type	A1 Journal article-refereed

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10.1016/j.jnucmat.2014.12.033

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title = "Impact of W events and dust on JET-ILW operation",

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.",

author = "M. Sertoli and Flanagan, {J. C.} and M. Bacharis and O. Kardaun and A. Jarvinen and Matthews, {G. F.} and S. Brezinsek and D. Harting and A. Cackett and E. Hodille and Coffey, {I. H.} and E. Lazzaro and T. P{\"u}tterich",

year = "2015",

month = jul,

day = "22",

doi = "10.1016/j.jnucmat.2014.12.033",

language = "English",

volume = "463",

pages = "837--841",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier Science B.V.",

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TY - JOUR

T1 - Impact of W events and dust on JET-ILW operation

AU - Sertoli, M.

AU - Flanagan, J. C.

AU - Bacharis, M.

AU - Kardaun, O.

AU - Jarvinen, A.

AU - Matthews, G. F.

AU - Brezinsek, S.

AU - Harting, D.

AU - Cackett, A.

AU - Hodille, E.

AU - Coffey, I. H.

AU - Lazzaro, E.

AU - Pütterich, T.

PY - 2015/7/22

Y1 - 2015/7/22

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84937724899&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2014.12.033

DO - 10.1016/j.jnucmat.2014.12.033

M3 - Article

SN - 0022-3115

VL - 463

SP - 837

EP - 841

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 48764

ER -

Impact of W events and dust on JET-ILW operation

Abstract

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