Reversal of Simple Hydrogenic Isotope Scaling Laws in Tokamak Edge Turbulence

Belli, E. A.; Candy, J.; Waltz, R. E.

doi:10.1103/physrevlett.125.015001

Reversal of Simple Hydrogenic Isotope Scaling Laws in Tokamak Edge Turbulence

Journal Article · Tue Jun 30 00:00:00 UTC 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.015001· OSTI ID:1650359

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General Atomics, San Diego, CA (United States); General Atomics, Energy & Advanced Concepts, DIII-D
General Atomics, San Diego, CA (United States)

The role of nonadiabatic electrons in regulating the hydrogenic isotope-mass scaling of gyrokinetic turbulence in tokamak fusion plasmas is assessed in the transition from ion-dominated core transport regimes to electron-dominated edge transport regimes. We propose a new isotope-mass scaling law that describes the electron-to-ion mass-ratio dependence of turbulent ion and electron energy fluxes. Here, the massratio dependence arises from the nonadiabatic response associated with fast electron parallel motion and plays a key role in altering—and in the case of the DIII-D edge, favorably reversing—the naive gyro-Bohm scaling behavior. In the reversed regime hydrogen energy fluxes are larger than deuterium fluxes, which is the opposite of the naive prediction.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1650359

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 125; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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