Study on impurity hole plasmas by global neoclassical simulation
An impurity hole observed in the large helical device (LHD) is a hollow density profile of an
impurity ion species formed in the core plasma where the negative (inward-pointing) …
impurity ion species formed in the core plasma where the negative (inward-pointing) …
3D toroidal physics: Testing the boundaries of symmetry breaking
DA Spong - Physics of Plasmas, 2015 - pubs.aip.org
Toroidal symmetry is an important concept for plasma confinement; it allows the existence of
nested flux surface MHD equilibria and conserved invariants for particle motion. However …
nested flux surface MHD equilibria and conserved invariants for particle motion. However …
Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy
K Ida, M Yoshinuma, K Yamasaki… - Review of Scientific …, 2019 - pubs.aip.org
A bulk charge exchange spectroscopy system has been applied to measure the radial
profiles of the hydrogen (H) and deuterium (D) density ratio in the isotope mixture plasma in …
profiles of the hydrogen (H) and deuterium (D) density ratio in the isotope mixture plasma in …
Collisionality dependence and ion species effects on heat transport in He and H plasma, and the role of ion scale turbulence in LHD
K Tanaka, K Nagaoka, S Murakami, H Takahashi… - Nuclear …, 2017 - iopscience.iop.org
Surveys of the ion and electron heat transports of neutral beam (NB) heating plasma were
carried out by power balance analysis in He and H rich plasma at LHD. Collisionality was …
carried out by power balance analysis in He and H rich plasma at LHD. Collisionality was …
Strong suppression of impurity accumulation in steady-state hydrogen discharges with high power NBI heating on LHD
Y Nakamura, N Tamura, M Yoshinuma, C Suzuki… - Nuclear …, 2017 - iopscience.iop.org
Strong suppression of impurity accumulation is observed in long pulse hydrogen discharges
with high power NBI (neutral beam injection) heating (P nbi> 10 MW) on the large helical …
with high power NBI (neutral beam injection) heating (P nbi> 10 MW) on the large helical …
The internal disruption as hard Magnetohydrodynamic limit of 1/2 sawtooth like activity in large helical device
J Varela, KY Watanabe, S Ohdachi - Physics of Plasmas, 2012 - pubs.aip.org
Large helical device (LHD) inward-shifted configurations are unstable to resistive MHD
pressure-gradient-driven modes. Sawtooth like activity was observed during LHD operation …
pressure-gradient-driven modes. Sawtooth like activity was observed during LHD operation …
Impacts of external momentum torque on impurity particle transport in LHD
Particle transport processes of impurity ions in a multi-ion-species plasma in the Large
Helical Device are investigated by neoclassical transport simulations. While the quasi-linear …
Helical Device are investigated by neoclassical transport simulations. While the quasi-linear …
Hard magnetohydrodynamic limit in 1/3 sawtooth like activity in LHD
J Varela, KY Watanabe, S Ohdachi, Y Narushima - Physics of Plasmas, 2014 - pubs.aip.org
The optimization of LHD discharges in inward-shifted configurations with 1/3 sawtooth like
activity is an open issue. These relaxation events limit the LHD performance driving a …
activity is an open issue. These relaxation events limit the LHD performance driving a …
Role of neoclassical transport and radial electric field in LHD plasmas
M Yokoyama, A Wakasa, S Murakami… - Fusion Science and …, 2010 - Taylor & Francis
This paper reviews how neoclassical (NC) transport analyses have been exploited to
predict/understand the improved confinement achieved in the Large Helical Device (LHD) …
predict/understand the improved confinement achieved in the Large Helical Device (LHD) …
Causal impact of magnetic fluctuations in slow and fast L–H transitions at TJ-II
B. Ph. van Milligen, T. Estrada, BA Carreras, E. Ascasíbar, C. Hidalgo, I. Pastor, JM
Fontdecaba, R. Balbín, TJ-II Team; Causal impact of magnetic fluctuations in slow and fast L …
Fontdecaba, R. Balbín, TJ-II Team; Causal impact of magnetic fluctuations in slow and fast L …