Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

J. Lovell; S. S. Henderson; J. M. Stobbs; A. Kirk; F. Federici; B. S. Patel; P. J. Ryan; J. R. Harrison; B. A. Lomanowski; J. D. Lore

doi:10.1016/j.nme.2024.101779

Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

J. Lovell, S. S. Henderson, J. M. Stobbs, A. Kirk, F. Federici, B. S. Patel, P. J. Ryan, J. R. Harrison, B. A. Lomanowski, J. D. Lore

Power Exhaust and Particle Control

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

Abstract

Global power balance calculations in steady state H mode plasmas varying the distance between separatrices (dr_sep) and the divertor configuration have been performed in MAST Upgrade. As dr_sep becomes more negative, more of the power crossing the separatrix goes to the lower divertor. The inner divertor receives a higher fraction of the power exhaust in a Super-X divertor plasma compared to a conventional divertor plasma at similar negative dr_sep, which is a concern for high power devices employing alternative divertor configurations for power exhaust handling. Global power accounting suggests >30% of the input power is unaccounted for with the power loss channels quantified in this work. Charge exchange and orbit losses from the NBI could account for a large fraction of unaccounted power but it is not possible to precisely determine this without further diagnostic calibration.

Original language	English
Article number	101779
Journal	Nuclear Materials and Energy
Volume	41
DOIs	https://doi.org/10.1016/j.nme.2024.101779
State	Published - Dec 2024

Funding

This work was supported by the US DOE under award DE-AC05-00OR22725 and by the EPSRC, UK Energy Programme grant EP/W006839/1. The authors would like to thank Clive Michael of UCLA for providing the passive FIDA data presented in Section 4.

Funders	Funder number
Clive Michael of UCLA
U.S. Department of Energy	DE-AC05-00OR22725
U.S. Department of Energy
Engineering and Physical Sciences Research Council	EP/W006839/1
Engineering and Physical Sciences Research Council

Keywords

Alternative divertors
Power balance
Power exhaust
Tokamak

UN SDGs

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

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10.1016/j.nme.2024.101779

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title = "Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade",

abstract = "Global power balance calculations in steady state H mode plasmas varying the distance between separatrices (drsep) and the divertor configuration have been performed in MAST Upgrade. As drsep becomes more negative, more of the power crossing the separatrix goes to the lower divertor. The inner divertor receives a higher fraction of the power exhaust in a Super-X divertor plasma compared to a conventional divertor plasma at similar negative drsep, which is a concern for high power devices employing alternative divertor configurations for power exhaust handling. Global power accounting suggests >30% of the input power is unaccounted for with the power loss channels quantified in this work. Charge exchange and orbit losses from the NBI could account for a large fraction of unaccounted power but it is not possible to precisely determine this without further diagnostic calibration.",

keywords = "Alternative divertors, Power balance, Power exhaust, Tokamak",

author = "J. Lovell and Henderson, {S. S.} and Stobbs, {J. M.} and A. Kirk and F. Federici and Patel, {B. S.} and Ryan, {P. J.} and Harrison, {J. R.} and Lomanowski, {B. A.} and Lore, {J. D.}",

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year = "2024",

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doi = "10.1016/j.nme.2024.101779",

language = "English",

volume = "41",

journal = "Nuclear Materials and Energy",

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TY - JOUR

T1 - Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

AU - Lovell, J.

AU - Henderson, S. S.

AU - Stobbs, J. M.

AU - Kirk, A.

AU - Federici, F.

AU - Patel, B. S.

AU - Ryan, P. J.

AU - Harrison, J. R.

AU - Lomanowski, B. A.

AU - Lore, J. D.

PY - 2024/12

Y1 - 2024/12

N2 - Global power balance calculations in steady state H mode plasmas varying the distance between separatrices (drsep) and the divertor configuration have been performed in MAST Upgrade. As drsep becomes more negative, more of the power crossing the separatrix goes to the lower divertor. The inner divertor receives a higher fraction of the power exhaust in a Super-X divertor plasma compared to a conventional divertor plasma at similar negative drsep, which is a concern for high power devices employing alternative divertor configurations for power exhaust handling. Global power accounting suggests >30% of the input power is unaccounted for with the power loss channels quantified in this work. Charge exchange and orbit losses from the NBI could account for a large fraction of unaccounted power but it is not possible to precisely determine this without further diagnostic calibration.

AB - Global power balance calculations in steady state H mode plasmas varying the distance between separatrices (drsep) and the divertor configuration have been performed in MAST Upgrade. As drsep becomes more negative, more of the power crossing the separatrix goes to the lower divertor. The inner divertor receives a higher fraction of the power exhaust in a Super-X divertor plasma compared to a conventional divertor plasma at similar negative drsep, which is a concern for high power devices employing alternative divertor configurations for power exhaust handling. Global power accounting suggests >30% of the input power is unaccounted for with the power loss channels quantified in this work. Charge exchange and orbit losses from the NBI could account for a large fraction of unaccounted power but it is not possible to precisely determine this without further diagnostic calibration.

KW - Alternative divertors

KW - Power balance

KW - Power exhaust

KW - Tokamak

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U2 - 10.1016/j.nme.2024.101779

DO - 10.1016/j.nme.2024.101779

M3 - Article

AN - SCOPUS:85207337974

SN - 2352-1791

VL - 41

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

M1 - 101779

ER -

Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

Abstract

Funding

Keywords

UN SDGs

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