Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas

D. Rees; M. Groth; S. Aleiferis; S. Brezinsek; M. Brix; I. Jepu; K. D. Lawson; A. G. Meigs; S. Menmuir; K. Kirov; P. Lomas; C. Lowry; B. Thomas; A. Widdowson; P. Carvalho; E. Delabie; JET Contributors

doi:10.1016/j.nme.2024.101657

Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas

D. Rees^*, M. Groth, S. Aleiferis, S. Brezinsek, M. Brix, I. Jepu, K. D. Lawson, A. G. Meigs, S. Menmuir, K. Kirov, P. Lomas, C. Lowry, B. Thomas, A. Widdowson, P. Carvalho, E. Delabie, JET Contributors

^*Corresponding author for this work

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Abstract

Langmuir probe measurements in neutral beam injection (NBI) heated, low-confinement mode plasmas in JET ITER-like wall showed that the current to the divertor targets, I_div, in helium (He) plasmas was up to 70% lower on the low-field side (LFS) than in otherwise identical deuterium (D) plasmas. The edge plasma density at which the rollover of I_div occurred i.e. the onset of detachment, was 10% higher in He plasmas on both the LFS and high-field side (HFS). The density of I_div rollover increases by 25% for He when the NBI power increases 1MW to 5MW. The total radiated power was similar in He and D plasmas for densities below the I_div rollover. At densities above the I_div rollover density, the total radiated power and power from within the separatrix are higher in He, reducing the power across the separatrix and subsequently I_div,LFS. In He plasmas, the peak radiated power was observed within the confined region above the X-point in tomographic reconstructions from bolometry.

Original language	English
Article number	101657
Pages (from-to)	1-9
Number of pages	9
Journal	Nuclear Materials and Energy
Volume	39
DOIs	https://doi.org/10.1016/j.nme.2024.101657
Publication status	Published - Jun 2024
MoE publication type	A1 Journal article-refereed

Keywords

Detachment
Divertor
Helium plasma
JET
SOL
Tokamak

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Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmasFinal published version, 2.96 MBLicence: CC BY

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Rees, D., Groth, M., Aleiferis, S., Brezinsek, S., Brix, M., Jepu, I., Lawson, K. D., Meigs, A. G., Menmuir, S., Kirov, K., Lomas, P., Lowry, C., Thomas, B., Widdowson, A., Carvalho, P., Delabie, E., & JET Contributors (2024). Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas. Nuclear Materials and Energy, 39, 1-9. Article 101657. https://doi.org/10.1016/j.nme.2024.101657

@article{55ced342fa65478689216a2f06c98d73,

title = "Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas",

abstract = "Langmuir probe measurements in neutral beam injection (NBI) heated, low-confinement mode plasmas in JET ITER-like wall showed that the current to the divertor targets, Idiv, in helium (He) plasmas was up to 70% lower on the low-field side (LFS) than in otherwise identical deuterium (D) plasmas. The edge plasma density at which the rollover of Idiv occurred i.e. the onset of detachment, was 10% higher in He plasmas on both the LFS and high-field side (HFS). The density of Idiv rollover increases by 25% for He when the NBI power increases 1MW to 5MW. The total radiated power was similar in He and D plasmas for densities below the Idiv rollover. At densities above the Idiv rollover density, the total radiated power and power from within the separatrix are higher in He, reducing the power across the separatrix and subsequently Idiv,LFS. In He plasmas, the peak radiated power was observed within the confined region above the X-point in tomographic reconstructions from bolometry.",

keywords = "Detachment, Divertor, Helium plasma, JET, SOL, Tokamak",

author = "D. Rees and M. Groth and S. Aleiferis and S. Brezinsek and M. Brix and I. Jepu and Lawson, {K. D.} and Meigs, {A. G.} and S. Menmuir and K. Kirov and P. Lomas and C. Lowry and B. Thomas and A. Widdowson and P. Carvalho and E. Delabie and {JET Contributors}",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors",

year = "2024",

month = jun,

doi = "10.1016/j.nme.2024.101657",

language = "English",

volume = "39",

pages = "1--9",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier Science",

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Rees, D , Groth, M, Aleiferis, S, Brezinsek, S, Brix, M, Jepu, I, Lawson, KD, Meigs, AG, Menmuir, S, Kirov, K, Lomas, P, Lowry, C, Thomas, B, Widdowson, A, Carvalho, P, Delabie, E & JET Contributors 2024, 'Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas', Nuclear Materials and Energy, vol. 39, 101657, pp. 1-9. https://doi.org/10.1016/j.nme.2024.101657

TY - JOUR

T1 - Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas

AU - Rees, D.

AU - Groth, M.

AU - Aleiferis, S.

AU - Brezinsek, S.

AU - Brix, M.

AU - Jepu, I.

AU - Lawson, K. D.

AU - Meigs, A. G.

AU - Menmuir, S.

AU - Kirov, K.

AU - Lomas, P.

AU - Lowry, C.

AU - Thomas, B.

AU - Widdowson, A.

AU - Carvalho, P.

AU - Delabie, E.

AU - JET Contributors

PY - 2024/6

Y1 - 2024/6

N2 - Langmuir probe measurements in neutral beam injection (NBI) heated, low-confinement mode plasmas in JET ITER-like wall showed that the current to the divertor targets, Idiv, in helium (He) plasmas was up to 70% lower on the low-field side (LFS) than in otherwise identical deuterium (D) plasmas. The edge plasma density at which the rollover of Idiv occurred i.e. the onset of detachment, was 10% higher in He plasmas on both the LFS and high-field side (HFS). The density of Idiv rollover increases by 25% for He when the NBI power increases 1MW to 5MW. The total radiated power was similar in He and D plasmas for densities below the Idiv rollover. At densities above the Idiv rollover density, the total radiated power and power from within the separatrix are higher in He, reducing the power across the separatrix and subsequently Idiv,LFS. In He plasmas, the peak radiated power was observed within the confined region above the X-point in tomographic reconstructions from bolometry.

AB - Langmuir probe measurements in neutral beam injection (NBI) heated, low-confinement mode plasmas in JET ITER-like wall showed that the current to the divertor targets, Idiv, in helium (He) plasmas was up to 70% lower on the low-field side (LFS) than in otherwise identical deuterium (D) plasmas. The edge plasma density at which the rollover of Idiv occurred i.e. the onset of detachment, was 10% higher in He plasmas on both the LFS and high-field side (HFS). The density of Idiv rollover increases by 25% for He when the NBI power increases 1MW to 5MW. The total radiated power was similar in He and D plasmas for densities below the Idiv rollover. At densities above the Idiv rollover density, the total radiated power and power from within the separatrix are higher in He, reducing the power across the separatrix and subsequently Idiv,LFS. In He plasmas, the peak radiated power was observed within the confined region above the X-point in tomographic reconstructions from bolometry.

KW - Detachment

KW - Divertor

KW - Helium plasma

KW - JET

KW - SOL

KW - Tokamak

UR - http://www.scopus.com/inward/record.url?scp=85192393628&partnerID=8YFLogxK

U2 - 10.1016/j.nme.2024.101657

DO - 10.1016/j.nme.2024.101657

M3 - Article

AN - SCOPUS:85192393628

SN - 2352-1791

VL - 39

SP - 1

EP - 9

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101657

ER -

Characterisation of the scrape-off layer in JET-ILW deuterium and helium low-confinement mode plasmas

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