Recent progress in understanding electron thermal transport in NSTX
Yang Ren,Elena Belova,Nikolai Gorelenkov,W. Guttenfelder,Stanley Kaye,E. Mazzucato,J. L. Peterson,David R. Smith,Dan Stutman,Kevin Tritz,W. X. Wang,Howard Yuh,R.E. Bell,Calvin Domier,B.P. LeBlanc +14 more
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The anomalous level of electron thermal transport inferred in magnetically confined configurations is one of the most challenging problems for the ultimate realization of fusion power using toroidal devices: tokamaks, spherical tori and stellarators as mentioned in this paper.Abstract:
The anomalous level of electron thermal transport inferred in magnetically confined configurations is one of the most challenging problems for the ultimate realization of fusion power using toroidal devices: tokamaks, spherical tori and stellarators. It is generally believed that plasma instabilities driven by the abundant free energy in fusion plasmas are responsible for the electron thermal transport. The National Spherical Torus eXperiment (NSTX) [M. Ono et al., Nucl. Fusion 40 557, 2000] provides a unique laboratory for studying plasma instabilities and their relation to electron thermal transport due to its low toroidal field, high plasma beta, low aspect ratio and large ExB flow shear. Recent findings on NSTX have shown that multiple instabilities are required to explain observed electron thermal transport, given the wide range of equilibrium parameters due to different operational scenarios and radial regions in fusion plasmas. Here we review the recent progresses in understanding anomalous electron thermal transport in NSTX and focus on mechanisms that could drive electron thermal transport in the core region. The synergy between experiment and theoretical/numerical modeling is essential to achieving these progress. The plans for newly commissioned NSTX-Upgrade will also be discussed. PACS numbers: Valid PACS appear hereread more
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Journal Article
The Dependence of H-mode Energy Confinement and Transport on Collisionality in NSTX
Stanley Kaye,S.P. Gerhardt,W. Guttenfelder,R. Maingi,R. E. Bell,Ahmed Diallo,Ben Leblanc,Mario Podesta +7 more
TL;DR: In this article, a wide range of collisionality has been obtained in the National Spherical Torus Experiment (NSTX) by employing two different wall conditioning techniques, one with boronization and between-shot helium glow discharge conditioning (HeGDC+B), and one using lithium evaporation (Li EVAP).
Journal Article
Multi-energy Soft X-ray diagnostic for NSTX
TL;DR: A diode-based, multi-energy soft x-ray (ME-SXR) diagnostic has been developed for the National Spherical Tokamak Experiment (NSTX) as mentioned in this paper.
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Numerical simulations of global Alfvén eigenmodes excitation and stabilization in NSTX-U
TL;DR: In this paper, three-dimensional nonlinear simulations of GF eigenmodes in the subcyclotron frequency range show a robust physical stabilizing mechanism via modest off-axis beam injection, in agreement with experimental observations from NSTX-U.
Journal ArticleDOI
Fusion triple product increase in ten times in the compact spherical tokamak Globus-M2 due the doubling of the toroidal magnetic field
G. S. Kurskiev,V. K. Gusev,N. V. Sakharov,I. M. Balachenkov,N. N. Bakharev,V. V. Bulanin,F. V. Chernyshev,A. A. Kavin,E. O. Kiselev,N. A. Khromov,V. B. Minaev,I V Miroshnikov,M. I. Patrov,A. A. Petrov,Yu. V. Petrov,P. B. Shchegolev,Ann Yu Telnova,V. A. Tokarev,Sergey Tolstyakov,E. A. Tukhmeneva,V. I. Varfolomeev,Alexander Yashin,N.S. Zhiltsov +22 more
References
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Electron heat transport in a tokamak with destroyed magnetic surfaces
TL;DR: In this paper, the authors derived formulas for the electron thermal conductivity in the collisional and collisionless limits for the case of destroyed magnetic surfaces and showed that these formulas can be used to derive a collision-free model of the electron conductivity.
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Drift waves and transport
TL;DR: In this paper, a wealth of information obtained from quasistationary laboratory experiments for plasma confinement is reviewed for drift waves driven unstable by density gradients, temperature gradients and trapped particle effects.
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Comparisons and physics basis of tokamak transport models and turbulence simulations
Andris Dimits,Glenn Bateman,Michael A. Beer,Bruce I. Cohen,William Dorland,Gregory W. Hammett,Charlson C. Kim,J. E. Kinsey,Mike Kotschenreuther,Arnold H. Kritz,L. L. Lao,John Mandrekas,W. M. Nevins,Scott Parker,Aaron J. Redd,D. E. Shumaker,Richard Sydora,Jan Weiland +17 more
TL;DR: In this paper, the authors compared the performance of gyrokinetic and gyrofluid simulations of ion-temperature gradient (ITG)instability and turbulence in tokamak plasmas as well as some tokak plasma thermal transportmodels.
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Edge localized modes (ELMs)
TL;DR: In this article, the phenomenology of edge localized modes (ELMs), an MHD instability occurring in the edge of H-mode plasmas in toroidal magnetic fusion experiments, is described.