Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas

the JET contributors

doi:10.1016/j.nme.2022.101345

Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas

the JET contributors

Power Exhaust and Particle Control

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

9 Scopus citations

Abstract

Measurements of the ion currents to and plasma conditions at the low-field side (LFS) divertor target plate in low-confinement mode plasmas in the JET ITER-like wall materials configuration show that the core plasma density required to detach the LFS divertor plasma is independent of the hydrogenic species protium, deuterium and tritium, and a 40 %/60 % deuterium–tritium mixture. This observation applies to a divertor plasma configuration with the LFS strike line connected to the horizontal part of the LFS divertor chosen because of its superior diagnostic coverage. The finding is independent of the operational status of the JET cryogenic pump. The electron temperature (T_e) at the LFS strike line was markedly reduced from 25 eV to 5 eV over a narrow range of increasing core plasma density, and observed to be between 2 eV and 3 eV at the onset of detachment. The electron density (n_e) peaks across the LFS plasma when T_e at the target plate is 1 eV, and spatially moves to the X-point for higher core densities. The density limit was found approximately 20 % higher in protium than in tritium and deuterium–tritium plasmas.

Original language	English
Article number	101345
Journal	Nuclear Materials and Energy
Volume	34
DOIs	https://doi.org/10.1016/j.nme.2022.101345
State	Published - Mar 2023

Funding

This scientific paper has been published as part of the international project co-financed by the Polish Ministry of Science and Higher Education within the programme called 'PMW' for 2020-22. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 \u2014 EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.

Keywords

Detachment
Hydrogen isotopes
JET

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nme.2022.101345

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@article{c77676cddfda4bf29e7e011b46dc635d,

title = "Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas",

abstract = "Measurements of the ion currents to and plasma conditions at the low-field side (LFS) divertor target plate in low-confinement mode plasmas in the JET ITER-like wall materials configuration show that the core plasma density required to detach the LFS divertor plasma is independent of the hydrogenic species protium, deuterium and tritium, and a 40 %/60 % deuterium–tritium mixture. This observation applies to a divertor plasma configuration with the LFS strike line connected to the horizontal part of the LFS divertor chosen because of its superior diagnostic coverage. The finding is independent of the operational status of the JET cryogenic pump. The electron temperature (Te) at the LFS strike line was markedly reduced from 25 eV to 5 eV over a narrow range of increasing core plasma density, and observed to be between 2 eV and 3 eV at the onset of detachment. The electron density (ne) peaks across the LFS plasma when Te at the target plate is 1 eV, and spatially moves to the X-point for higher core densities. The density limit was found approximately 20 % higher in protium than in tritium and deuterium–tritium plasmas.",

keywords = "Detachment, Hydrogen isotopes, JET",

author = "{the JET contributors} and M. Groth and V. Solokha and S. Aleiferis and S. Brezinsek and M. Brix and Carvalho, {I. S.} and P. Carvalho and G. Corrigan and D. Harting and N. Horsten and I. Jepu and J. Karhunen and K. Kirov and B. Lomanowski and Lawson, {K. D.} and C. Lowry and Meigs, {A. G.} and S. Menmuir and E. Pawelec and T. Pereira and A. Shaw and S. Silburn and B. Thomas and S. Wiesen and P. B{\"o}rner and D. Borodin and S. Jachmich and D. Reiter and G. Sergienko and Z. Stancar and B. Viola and P. Beaumont and J. Bernardo and I. Coffey and Conway, {N. J.} and {de la Luna}, E. and D. Douai and C. Giroud and J. Hillesheim and L. Horvath and A. Huber and P. Lomas and Maggi, {C. F.} and M. Maslov and {Perez von Thun}, C. and S. Scully and N. Vianello and M. Wischmeier",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors",

year = "2023",

month = mar,

doi = "10.1016/j.nme.2022.101345",

language = "English",

volume = "34",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

}

TY - JOUR

T1 - Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas

AU - the JET contributors

AU - Groth, M.

AU - Solokha, V.

AU - Aleiferis, S.

AU - Brezinsek, S.

AU - Brix, M.

AU - Carvalho, I. S.

AU - Carvalho, P.

AU - Corrigan, G.

AU - Harting, D.

AU - Horsten, N.

AU - Jepu, I.

AU - Karhunen, J.

AU - Kirov, K.

AU - Lomanowski, B.

AU - Lawson, K. D.

AU - Lowry, C.

AU - Meigs, A. G.

AU - Menmuir, S.

AU - Pawelec, E.

AU - Pereira, T.

AU - Shaw, A.

AU - Silburn, S.

AU - Thomas, B.

AU - Wiesen, S.

AU - Börner, P.

AU - Borodin, D.

AU - Jachmich, S.

AU - Reiter, D.

AU - Sergienko, G.

AU - Stancar, Z.

AU - Viola, B.

AU - Beaumont, P.

AU - Bernardo, J.

AU - Coffey, I.

AU - Conway, N. J.

AU - de la Luna, E.

AU - Douai, D.

AU - Giroud, C.

AU - Hillesheim, J.

AU - Horvath, L.

AU - Huber, A.

AU - Lomas, P.

AU - Maggi, C. F.

AU - Maslov, M.

AU - Perez von Thun, C.

AU - Scully, S.

AU - Vianello, N.

AU - Wischmeier, M.

PY - 2023/3

Y1 - 2023/3

N2 - Measurements of the ion currents to and plasma conditions at the low-field side (LFS) divertor target plate in low-confinement mode plasmas in the JET ITER-like wall materials configuration show that the core plasma density required to detach the LFS divertor plasma is independent of the hydrogenic species protium, deuterium and tritium, and a 40 %/60 % deuterium–tritium mixture. This observation applies to a divertor plasma configuration with the LFS strike line connected to the horizontal part of the LFS divertor chosen because of its superior diagnostic coverage. The finding is independent of the operational status of the JET cryogenic pump. The electron temperature (Te) at the LFS strike line was markedly reduced from 25 eV to 5 eV over a narrow range of increasing core plasma density, and observed to be between 2 eV and 3 eV at the onset of detachment. The electron density (ne) peaks across the LFS plasma when Te at the target plate is 1 eV, and spatially moves to the X-point for higher core densities. The density limit was found approximately 20 % higher in protium than in tritium and deuterium–tritium plasmas.

AB - Measurements of the ion currents to and plasma conditions at the low-field side (LFS) divertor target plate in low-confinement mode plasmas in the JET ITER-like wall materials configuration show that the core plasma density required to detach the LFS divertor plasma is independent of the hydrogenic species protium, deuterium and tritium, and a 40 %/60 % deuterium–tritium mixture. This observation applies to a divertor plasma configuration with the LFS strike line connected to the horizontal part of the LFS divertor chosen because of its superior diagnostic coverage. The finding is independent of the operational status of the JET cryogenic pump. The electron temperature (Te) at the LFS strike line was markedly reduced from 25 eV to 5 eV over a narrow range of increasing core plasma density, and observed to be between 2 eV and 3 eV at the onset of detachment. The electron density (ne) peaks across the LFS plasma when Te at the target plate is 1 eV, and spatially moves to the X-point for higher core densities. The density limit was found approximately 20 % higher in protium than in tritium and deuterium–tritium plasmas.

KW - Detachment

KW - Hydrogen isotopes

KW - JET

UR - http://www.scopus.com/inward/record.url?scp=85144607852&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2022.101345

DO - 10.1016/j.nme.2022.101345

M3 - Article

AN - SCOPUS:85144607852

SN - 2352-1791

VL - 34

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101345

ER -

Characterisation of divertor detachment onset in JET-ILW hydrogen, deuterium, tritium and deuterium–tritium low-confinement mode plasmas

Abstract

Funding

Keywords

UN SDGs

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