Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor

J.P. Coad, Jari Likonen, M. Rubel, Elizaveta Vainonen-Ahlgren, D.E. Hole, T. Sajavaara, Tommi Renvall, G.F. Matthews, JET-EFDA Contributors

Research output: Contribution to journalArticleScientificpeer-review

78 Citations (Scopus)

Abstract

In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.
Original languageEnglish
Pages (from-to)350-366
Number of pages17
JournalNuclear Fusion
Volume46
Issue number2
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

boxes
erosion
tiles
gases
markers
tracers
methane
deposits
asymmetry
injection
impurities
carbon

Keywords

  • JET
  • plasma
  • fusion energy
  • fusion reactors
  • ITER
  • Tokamak
  • divertor
  • divertor plasma

Cite this

Coad, J. P., Likonen, J., Rubel, M., Vainonen-Ahlgren, E., Hole, D. E., Sajavaara, T., ... JET-EFDA Contributors (2006). Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. Nuclear Fusion, 46(2), 350-366. https://doi.org/10.1088/0029-5515/46/2/018
Coad, J.P. ; Likonen, Jari ; Rubel, M. ; Vainonen-Ahlgren, Elizaveta ; Hole, D.E. ; Sajavaara, T. ; Renvall, Tommi ; Matthews, G.F. ; JET-EFDA Contributors. / Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. In: Nuclear Fusion. 2006 ; Vol. 46, No. 2. pp. 350-366.
@article{bfe3375310784a3384e65a26977adff2,
title = "Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor",
abstract = "In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.",
keywords = "JET, plasma, fusion energy, fusion reactors, ITER, Tokamak, divertor, divertor plasma",
author = "J.P. Coad and Jari Likonen and M. Rubel and Elizaveta Vainonen-Ahlgren and D.E. Hole and T. Sajavaara and Tommi Renvall and G.F. Matthews and {JET-EFDA Contributors}",
year = "2006",
doi = "10.1088/0029-5515/46/2/018",
language = "English",
volume = "46",
pages = "350--366",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "Institute of Physics IOP",
number = "2",

}

Coad, JP, Likonen, J, Rubel, M, Vainonen-Ahlgren, E, Hole, DE, Sajavaara, T, Renvall, T, Matthews, GF & JET-EFDA Contributors 2006, 'Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor', Nuclear Fusion, vol. 46, no. 2, pp. 350-366. https://doi.org/10.1088/0029-5515/46/2/018

Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. / Coad, J.P.; Likonen, Jari; Rubel, M.; Vainonen-Ahlgren, Elizaveta; Hole, D.E.; Sajavaara, T.; Renvall, Tommi; Matthews, G.F.; JET-EFDA Contributors.

In: Nuclear Fusion, Vol. 46, No. 2, 2006, p. 350-366.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor

AU - Coad, J.P.

AU - Likonen, Jari

AU - Rubel, M.

AU - Vainonen-Ahlgren, Elizaveta

AU - Hole, D.E.

AU - Sajavaara, T.

AU - Renvall, Tommi

AU - Matthews, G.F.

AU - JET-EFDA Contributors,

PY - 2006

Y1 - 2006

N2 - In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.

AB - In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.

KW - JET

KW - plasma

KW - fusion energy

KW - fusion reactors

KW - ITER

KW - Tokamak

KW - divertor

KW - divertor plasma

U2 - 10.1088/0029-5515/46/2/018

DO - 10.1088/0029-5515/46/2/018

M3 - Article

VL - 46

SP - 350

EP - 366

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 2

ER -