Radiation in impurity-seeded discharges in the JET MkI, MkIIA and MkIIGB divertors

L. C. Ingesson; J. Rapp; G. F. Matthews

doi:10.1016/S0022-3115(02)01518-0

Radiation in impurity-seeded discharges in the JET MkI, MkIIA and MkIIGB divertors

L. C. Ingesson, J. Rapp, G. F. Matthews

Research output: Contribution to journal › Conference article › peer-review

13 Scopus citations

Abstract

Radiative cooling by seeded impurities is a way to reduce the power load on divertor targets. Impurity-seeding experiments carried out in the JET MkI, MkIIA and MkIIGB divertors are discussed, in particular in terms of their radiative properties. A reassessment of the radiation levels in about 235 discharges, seeded predominantly with nitrogen or neon, leads to the conclusion that radiation levels have been underestimated in some impurity-seeded plasmas in MkI and MkIIA. Apart from increased radiation levels, the consequences of the reassessment for the interpretation of impurity-seeded plasmas are limited. With the new estimates the understanding of the power balance and the fit to Matthews' scaling law for Z_eff are improved. The techniques for improved estimates of the total radiated power and radiated power in the divertor region are discussed and it is shown that weighted summation of bolometer line integrals is unreliable for impurity-seeded discharges in JET.

Original language	English
Pages (from-to)	1173-1177
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	313-316
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/S0022-3115(02)01518-0
State	Published - Mar 2003
Externally published	Yes
Event	Plasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan Duration: May 26 2002 → May 31 2002

Funding

This work has been performed under the European Fusion Development Agreement and was partly funded by Euratom, the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) and the UK Department of Trade and Industry.

Funders	Funder number
H2020 Euratom
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Department of Trade and Industry

Keywords

Bolometer tomography
Divertor plasma
Tokamak
Total radiation

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10.1016/S0022-3115(02)01518-0

Cite this

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title = "Radiation in impurity-seeded discharges in the JET MkI, MkIIA and MkIIGB divertors",

abstract = "Radiative cooling by seeded impurities is a way to reduce the power load on divertor targets. Impurity-seeding experiments carried out in the JET MkI, MkIIA and MkIIGB divertors are discussed, in particular in terms of their radiative properties. A reassessment of the radiation levels in about 235 discharges, seeded predominantly with nitrogen or neon, leads to the conclusion that radiation levels have been underestimated in some impurity-seeded plasmas in MkI and MkIIA. Apart from increased radiation levels, the consequences of the reassessment for the interpretation of impurity-seeded plasmas are limited. With the new estimates the understanding of the power balance and the fit to Matthews' scaling law for Zeff are improved. The techniques for improved estimates of the total radiated power and radiated power in the divertor region are discussed and it is shown that weighted summation of bolometer line integrals is unreliable for impurity-seeded discharges in JET.",

keywords = "Bolometer tomography, Divertor plasma, Tokamak, Total radiation",

author = "Ingesson, {L. C.} and J. Rapp and Matthews, {G. F.}",

year = "2003",

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doi = "10.1016/S0022-3115(02)01518-0",

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volume = "313-316",

pages = "1173--1177",

journal = "Journal of Nuclear Materials",

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note = "Plasma - Surface Interactions in Controlled Fusion Devices ; Conference date: 26-05-2002 Through 31-05-2002",

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TY - JOUR

T1 - Radiation in impurity-seeded discharges in the JET MkI, MkIIA and MkIIGB divertors

AU - Ingesson, L. C.

AU - Rapp, J.

AU - Matthews, G. F.

PY - 2003/3

Y1 - 2003/3

N2 - Radiative cooling by seeded impurities is a way to reduce the power load on divertor targets. Impurity-seeding experiments carried out in the JET MkI, MkIIA and MkIIGB divertors are discussed, in particular in terms of their radiative properties. A reassessment of the radiation levels in about 235 discharges, seeded predominantly with nitrogen or neon, leads to the conclusion that radiation levels have been underestimated in some impurity-seeded plasmas in MkI and MkIIA. Apart from increased radiation levels, the consequences of the reassessment for the interpretation of impurity-seeded plasmas are limited. With the new estimates the understanding of the power balance and the fit to Matthews' scaling law for Zeff are improved. The techniques for improved estimates of the total radiated power and radiated power in the divertor region are discussed and it is shown that weighted summation of bolometer line integrals is unreliable for impurity-seeded discharges in JET.

AB - Radiative cooling by seeded impurities is a way to reduce the power load on divertor targets. Impurity-seeding experiments carried out in the JET MkI, MkIIA and MkIIGB divertors are discussed, in particular in terms of their radiative properties. A reassessment of the radiation levels in about 235 discharges, seeded predominantly with nitrogen or neon, leads to the conclusion that radiation levels have been underestimated in some impurity-seeded plasmas in MkI and MkIIA. Apart from increased radiation levels, the consequences of the reassessment for the interpretation of impurity-seeded plasmas are limited. With the new estimates the understanding of the power balance and the fit to Matthews' scaling law for Zeff are improved. The techniques for improved estimates of the total radiated power and radiated power in the divertor region are discussed and it is shown that weighted summation of bolometer line integrals is unreliable for impurity-seeded discharges in JET.

KW - Bolometer tomography

KW - Divertor plasma

KW - Tokamak

KW - Total radiation

UR - http://www.scopus.com/inward/record.url?scp=17144458667&partnerID=8YFLogxK

U2 - 10.1016/S0022-3115(02)01518-0

DO - 10.1016/S0022-3115(02)01518-0

M3 - Conference article

AN - SCOPUS:17144458667

SN - 0022-3115

VL - 313-316

SP - 1173

EP - 1177

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL.

T2 - Plasma - Surface Interactions in Controlled Fusion Devices

Y2 - 26 May 2002 through 31 May 2002

ER -

Radiation in impurity-seeded discharges in the JET MkI, MkIIA and MkIIGB divertors

Abstract

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Keywords

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