Study of passively stable, fully detached divertor plasma regimes attained in innovative long-legged divertor configurations

Umansky, M. V.; LaBombard, B.; Brunner, Daniel; Golfinopoulos, T.; Kuang, A. Q.; Rensink, M. E.; Terry, James L.; Wigram, Michael; Whyte, D. G.

doi:10.1088/1741-4326/ab46f4

Study of passively stable, fully detached divertor plasma regimes attained in innovative long-legged divertor configurations

Journal Article · Wed Oct 30 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab46f4· OSTI ID:1884626

Umansky, M. V. ^[1]; ^[2]; ^[2]; Golfinopoulos, T. ^[2]; Kuang, A. Q. ^[2]; Rensink, M. E. ^[1]; ^[2]; ^[3]; Whyte, D. G. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of York (United Kingdom)

Numerical modeling of divertor configurations with radially or vertically extended, tightly baffled, outer divertor legs has demonstrated the existence of a passively-stable fully detached divertor regime. Here in the simulations, long-legged divertors provide up to an order-of-magnitude increase in peak power handling capability compared to conventional divertors. The key physics for attaining the passively stable, fully detached regime in these simulations involves the interplay of strong convective plasma transport to the divertor leg outer sidewall, confinement of neutral gas in the divertor volume, geometric effects including a secondary X-point, and atomic radiation. New analysis shows that in this regime the detachment front location is set by the balance between the power entering the divertor leg and the losses to the walls of the divertor channel. Correspondingly, the maximum power that can be accommodated by the divertor, while still staying detached, increases with the poloidal length of the leg. The detached regime access window in terms of input power, density and impurity seeding concentration varies quantitatively depending on divertor geometry and modeling assumptions most specifically, cross-field transport to the side walls.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1884626

Alternate ID(s):: OSTI ID: 22811041
OSTI ID: 23013470

Report Number(s):: LLNL-JRNL-767297; 957724

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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