First-wall fluxes from large and small ELMs

Perillo, R.; Boedo, J. A.; Lasnier, C. J.; McLean, A.; Marini, C.; Bykov, I.; Glass, F.; Kapat, A.; Nelson, A. O.; Rudakov, D. L.

doi:10.1063/5.0243880

First-wall fluxes from large and small ELMs

Journal Article · Wed Feb 05 00:00:00 EST 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0243880· OSTI ID:2511356

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University of California, San Diego, La Jolla, CA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)
Columbia University, New York, NY (United States)

Experimental analysis at DIII-D shows that small edge localized modes (ELMs) deposit a larger fraction of their energy to the first wall, compared to type-I ELMs in similar magnetic configuration and input power. The energy (λQ) and particle (λΓ) flux decay lengths in the scrape-off layer (SOL) are up to 3 and 5 times larger, respectively, for small ELMs than for larger type-I ELMs. Transport dynamics of ELM filaments in the SOL are found to be related to divertor conditions, where high divertor collisionality, typical for partially detached plasmas, is associated with increased cross field ELM radial fluxes. Results show that a sufficiently large outer wall gap and/or limiters might be needed in future scenarios to protect the first wall, if operating with small ELMs and a cold divertor. This might also have implications for RF heating in future devices, where the coupling efficiency is dependent to some degree to the outer-wall gap.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC52-07NA27344; FC02-04ER54698; FG02-07ER54917

OSTI ID:: 2511356

Alternate ID(s):: OSTI ID: 2515587

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 32; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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