Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JO05: Edge and Pedestal Physics
2:00 PM–5:00 PM,
Tuesday, October 18, 2022
Room: Ballroom 111 B
Chair: Roberto Maurizio, Oak Ridge Associated Universities / General Atomics
Abstract: JO05.00003 : A New Approach to SOL Broadening by Turbulence Spreading.*
2:24 PM–2:36 PM
Presenter:
Patrick H Diamond
(University of California, San Diego)
Author:
Patrick H Diamond
(University of California, San Diego)
Collaboration:
UC San Diego
boosted interest in turbulent pedestal states which drive SOL broadening by turbulence
spreading. Here we discuss a spectral intensity theory of SOL broadening by turbulence spreading.
The theory links the SOL scale to dynamics of the pedestal — in particular, to the
turbulence energy influx across the separatrix. The broadening of the layer-specifically the layer
width as a function of turbulence intensity- is calculated,
and the result is non-trivial, with a cross-over between two asymptototic trends. The HD result is recovered
for weak turbulence levels.We show
that modest levels of drift wave turbulence (i.e. Grassy ELMs) can adequately broaden the
SOL. We also present a novel approach to SOL turbulence spreading, based upon
dissipative, stochastic turbulence pulses. In contrast to familiar avalanche models ,a
key feature here is the absence of a conserved parameter, due to finite SOL dwell time.
The theory links SOL broadening to the intensity gradient at the separatrix. Results for the
statistical distribution of pulse penetration depths will be discussed.We derive a criterion for
the formation of SOL structure in turbulence . Implications for experiments will be discussed.
*Supported by US DOE
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