Abstract
The integrated modelling code TOPICS has been extended to include core impurity transport, and applied to predictive modelling of JT-60SA high-beta steady-state plasma with the accumulation of impurity seeded to reduce the divertor heat load. In the modelling, models and conditions are selected for a conservative prediction, which considers a lower bound of plasma performance with the maximum accumulation of impurity. The conservative prediction shows the compatibility of impurity seeding with core plasma with high-beta (β N > 3.5) and full current drive conditions, i.e. when Ar seeding reduces the divertor heat load below 10 MW m-2, its accumulation in the core is so moderate that the core plasma performance can be recovered by additional heating within the machine capability to compensate for Ar radiation. Due to the strong dependence of accumulation on the pedestal density gradient, high separatrix density is important for the low accumulation as well as the low divertor heat load. The conservative prediction also shows that JT-60SA has enough capability to explore the divertor heat load control by impurity seeding in high-beta steady-state plasmas.
| Original language | English |
|---|---|
| Article number | 066001 |
| Journal | Nuclear Fusion |
| Volume | 58 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2018 Apr 6 |
| Externally published | Yes |
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Keywords
- diverter heat load
- high beta
- impurity accumulation
- impurity seeding
- integrated modeling
- JT-60SA
- steady state scenario
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Condensed Matter Physics
Cite this
Predictive modelling of JT-60SA high-beta steady-state plasma with impurity accumulation. / Hayashi, N.; Hoshino, Kazuo; Honda, M.; Ide, S.
In: Nuclear Fusion, Vol. 58, No. 6, 066001, 06.04.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Predictive modelling of JT-60SA high-beta steady-state plasma with impurity accumulation
AU - Hayashi, N.
AU - Hoshino, Kazuo
AU - Honda, M.
AU - Ide, S.
PY - 2018/4/6
Y1 - 2018/4/6
N2 - The integrated modelling code TOPICS has been extended to include core impurity transport, and applied to predictive modelling of JT-60SA high-beta steady-state plasma with the accumulation of impurity seeded to reduce the divertor heat load. In the modelling, models and conditions are selected for a conservative prediction, which considers a lower bound of plasma performance with the maximum accumulation of impurity. The conservative prediction shows the compatibility of impurity seeding with core plasma with high-beta (β N > 3.5) and full current drive conditions, i.e. when Ar seeding reduces the divertor heat load below 10 MW m-2, its accumulation in the core is so moderate that the core plasma performance can be recovered by additional heating within the machine capability to compensate for Ar radiation. Due to the strong dependence of accumulation on the pedestal density gradient, high separatrix density is important for the low accumulation as well as the low divertor heat load. The conservative prediction also shows that JT-60SA has enough capability to explore the divertor heat load control by impurity seeding in high-beta steady-state plasmas.
AB - The integrated modelling code TOPICS has been extended to include core impurity transport, and applied to predictive modelling of JT-60SA high-beta steady-state plasma with the accumulation of impurity seeded to reduce the divertor heat load. In the modelling, models and conditions are selected for a conservative prediction, which considers a lower bound of plasma performance with the maximum accumulation of impurity. The conservative prediction shows the compatibility of impurity seeding with core plasma with high-beta (β N > 3.5) and full current drive conditions, i.e. when Ar seeding reduces the divertor heat load below 10 MW m-2, its accumulation in the core is so moderate that the core plasma performance can be recovered by additional heating within the machine capability to compensate for Ar radiation. Due to the strong dependence of accumulation on the pedestal density gradient, high separatrix density is important for the low accumulation as well as the low divertor heat load. The conservative prediction also shows that JT-60SA has enough capability to explore the divertor heat load control by impurity seeding in high-beta steady-state plasmas.
KW - diverter heat load
KW - high beta
KW - impurity accumulation
KW - impurity seeding
KW - integrated modeling
KW - JT-60SA
KW - steady state scenario
UR - http://www.scopus.com/inward/record.url?scp=85047224673&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047224673&partnerID=8YFLogxK
U2 - 10.1088/1741-4326/aab7bd
DO - 10.1088/1741-4326/aab7bd
M3 - Article
AN - SCOPUS:85047224673
VL - 58
JO - Nuclear Fusion
JF - Nuclear Fusion
SN - 0029-5515
IS - 6
M1 - 066001
ER -