Y. R. Lin‐Liu

National Central University

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C. C. Petty

General Atomics (United States)

V. S. Chan

University of Science and Technology of China

R. Prater

General Atomics (United States)

S. C. Chiu

National Cheng Kung University

R. W. Harvey

CompX (United States)

J. Lohr

General Atomics (United States)

L. L. Lao

General Atomics (United States)

R. Miller

The University of Texas at Arlington

A. D. Turnbull

General Atomics (United States)

R. Prater

FHNW University of Applied Sciences and Arts

Cooperative Institutions

General Atomics (United States)

156

Princeton Plasma Physics Laboratory

Fusion (United States)

Lawrence Livermore National Laboratory

University of California, Los Angeles

Fusion Academy

Oak Ridge National Laboratory

Princeton University

University of California, San Diego

Max Planck Institute for Plasma Physics

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Status of advanced tokamak scenario modelling with off-axis electron cyclotron current drive in DIII-D

Nuclear Fusion (2000)

M. Murakami H.E. St. John T. A. Casper M. S. Chu J. C. DeBoo

The status of modelling work focused on developing the advanced tokamak (AT) scenarios in DIII-D is discussed. The objective of the work is twofold: (a) to develop AT scenarios with ECCD using time dependent transport simulations, coupled with heating and current drive models, consistent with MHD equilibrium and stability; and (b) to use time dependent simulations to help plan experiments and to understand the key physics involved. Time dependent simulations based on transport coefficients derived from experimentally achieved target discharges are used to perform AT scenario modelling. The modelling indicates that off-axis ECCD with approximately 3 MW absorbed power can maintain high performance discharges with qmin > 1 for 5-10 s. The resultant equilibria are calculated to be stable to n = 1 pressure driven modes. The plasma is well into the second stability regime for high-n ballooning modes over a large part of the plasma volume. The role of continuous localized ECCD is studied for stabilizing m/n = 2/1 tearing modes. Progress towards validating current drive and transport models, consistent with experimental results, and developing self-consistent, integrated high performance AT scenarios is discussed.

DIII-D

Bootstrap current

Ballooning

Tearing

10.1088/0029-5515/40/6/320

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Citations (17)

Polarization, propagation, and deposition measurements during ECCD experiments on the DIII-D tokamak

AIP conference proceedings (1999)

C. C. Petty T. C. Luce M. E. Austin H. Ikezi Y. R. Lin‐Liu

The power deposition profiles for different poloidal and toroidal launch angles have been determined by modulating the ECH power and measuring the electron temperature response. The peak of the measured power density follows the poloidal steering of the ECH launcher, and perpendicular launch gives a narrower deposition profile than does oblique (current drive) launch. The difference in wave refraction between X-mode and O-mode allows positive identification of an unwanted O-mode component of the launched beam.

DIII-D

Deposition

10.1063/1.59673

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Citations (2)

Stability of helical textures in 3HeA in the presence of superflow

Physics Letters A (1979)

H. Kleinert Y. R. Lin‐Liu Kazumi Maki

Isotopes of helium

Texture (cosmology)

Constant (computer programming)

10.1016/0375-9601(79)90317-7

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Citations (15)

Numerical thermalization in particle-in-cell simulations with Monte-Carlo collisions

Physics of Plasmas (2014)

Po-Yen Lai T.Y. Lin Y. R. Lin‐Liu Shih-Hung Chen

Numerical thermalization in collisional one-dimensional (1D) electrostatic (ES) particle-in-cell (PIC) simulations was investigated. Two collision models, the pitch-angle scattering of electrons by the stationary ion background and large-angle collisions between the electrons and the neutral background, were included in the PIC simulation using Monte-Carlo methods. The numerical results show that the thermalization times in both models were considerably reduced by the additional Monte-Carlo collisions as demonstrated by comparisons with Turner's previous simulation results based on a head-on collision model [M. M. Turner, Phys. Plasmas 13, 033506 (2006)]. However, the breakdown of Dawson's scaling law in the collisional 1D ES PIC simulation is more complicated than that was observed by Turner, and the revised scaling law of the numerical thermalization time with numerical parameters are derived on the basis of the simulation results obtained in this study.

Thermalisation

Particle-in-cell

10.1063/1.4904307

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Citations (8)

Improved magnetohydrodynamic stability through optimization of higher order moments in cross-section shape of tokamaks

Physics of Plasmas (1999)

A. D. Turnbull Y. R. Lin‐Liu R. Miller T. S. Taylor T. N. Todd

Optimization of the higher order moments—specifically the squareness—of a tokamak cross-section can significantly enhance the stability to ideal magnetohydrodynamic ballooning and kink modes. At conventional aspect ratios, it is shown that access to the second regime of ballooning stability is facilitated by moderate squareness. In a low aspect ratio, fully bootstrap current driven spherical torus, optimization of the squareness results in an increase in β of the order of 10%, leading to a configuration stable to ballooning, axisymmetric, and ideal n⩽5 kink modes at β≃67%.

Ballooning

Bootstrap current

Kink instability

Aspect ratio (aeronautics)

10.1063/1.873380

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Citations (42)

3-D Fokker-Planck code valid for arbitrary collisionality and adjoint function for current-drive and bootstrap current calculation

O. Sauter Y. R. Lin‐Liu F. L. Hinton J. Václavík

Note: Proc. Joint Varenna-Lausanne Int. Workshop on Theory of Fusion Plasmas, Varenna, Italy, August 1994, ISPP-15, 337 - 344 (1994) Reference CRPP-CONF-1994-040 Record created on 2008-05-13, modified on 2017-05-12

Collisionality

Code (set theory)

Source

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Citations (0)

Steady State Tokamak Equilibria without Current Drive

Physical Review Letters (1997)

K. C. Shaing A. Y. Aydemir Y. R. Lin‐Liu R.L. Miller

Steady state tokamak equilibria without current drive are found. This is made possible by including the potato bootstrap current close to the magnetic axis. Tokamaks with this class of equilibria do not need seed current or current drive, and are intrinsically steady state.

Bootstrap current

10.1103/physrevlett.79.3652

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Citations (30)

Modeling of 110 GHz electron cyclotron wave propagation and absorption on DIII-D

AIP conference proceedings (1997)

Y. R. Lin‐Liu T. C. Luce S. C. Chiu R. Miller R. Prater

Warm plasma refraction effects on wave propagation and absorption are examined in the context of a slab model in the parameter regime of interest to the upcoming 110 GHz electron cyclotron heating and current drive experiments on DIII-D.

DIII-D

Slab

Electron cyclotron resonance

10.1063/1.53363

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Citations (9)

Modification of the current profile in DIII-D by off-axis electron cyclotron current drive

Plasma Physics and Controlled Fusion (1999)

T. C. Luce Y. R. Lin‐Liu Richard Harvey G. Giruzzi J. Lohr

Localized non-inductive currents due to electron cyclotron wave absorption have been measured on the DIII-D tokamak. Clear evidence of non-inductive currents is seen on the internal magnetic field measurements by motional Stark effect spectroscopy. The magnitude and location of the non-inductive current is evaluated by comparing the total and ohmic current profiles of discharges with and without electron cyclotron wave power. The measured current agrees with Fokker-Planck calculations near the magnetic axis, but exceeds the predicted value as the location of the current drive is moved to the half-radius.

DIII-D

10.1088/0741-3335/41/12b/308

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Citations (18)

Textures near the A→A1 transition in superfluid He: NMR and current effects

Physica B+C (1978)

P. Kumar Y. R. Lin‐Liu

10.1016/0378-4363(78)90143-2

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Citations (1)