27 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "Kinsey, J."

open access

Inductive currents in an rf driven plasma

Inductive effects are included in a self-consistent current drive model for axisymmetric tokamak plasmas used in the two-dimensional current drive/MHD equilibrium code, RIP. Previous simulations of current driven equilibria allowed for the steady-state calculation of bootstrap and RF currents. The addition of an inductive current is applied to enhance accurate design and interpretation of tokamak experiments. A convenient expression for the ohmic resistance in a tokamak plasma is derived to aid… more

Date: August 1, 1991

Creator: Kinsey, J. & Ehst, D.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Anomalous transport modelling of tokamak plasmas

Theory based transport simulations of DIII-D, JET, ITER are compared to experimental data using a combination of anamolous transport models. The Multiple-mode Transport Model is calibrated to a give set of L-mode and H-mode discharges with an emphasis on testing the adequacy of anomalous flux contributions from drift/[eta][sub i] and resistive ballooning mode theories. A survey of possible additions and/or alternatives to the model from recent theories on neoclassical MHD effects, hot ion modes… more

Date: January 1, 1992

Creator: Kinsey, J.; Singer, C.; Malone, G. & Tiouririne, N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Anomalous transport modelling of tokamak plasmas

Theory based transport simulations of DIII-D, JET, ITER are compared to experimental data using a combination of anamolous transport models. The Multiple-mode Transport Model is calibrated to a give set of L-mode and H-mode discharges with an emphasis on testing the adequacy of anomalous flux contributions from drift/{eta}{sub i} and resistive ballooning mode theories. A survey of possible additions and/or alternatives to the model from recent theories on neoclassical MHD effects, hot ion modes… more

Date: December 31, 1992

Creator: Kinsey, J.; Singer, C.; Malone, G. & Tiouririne, N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transport From Overlapping Electron and Ion Driftwave Instabilities

The electron temperature gradient (ETG) mode is a likely contributor to electron thermal transport in tokamaks. The ETG modes are dominantly unstable for poloidal wavelengths shorter than the ion gyroradius (high-k) where the ion response is adiabatic. Thus, they do not directly produce ion thermal or momentum transport or particle transport. Two potential mechanisms whereby ETG modes could produce transport in these channels are explored in this paper: a nonlinear coupling between high-k ETG m… more

Date: July 2, 2004

Creator: Staebler, G. M.; Kinsey, J. E. & Waltz, R. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

INCREASED UNDERSTANDING OF THE DYNAMICS AND TRANSPORT IN ITB PLASMAS FROM MULTI-MACHINE COMPARISONS

OAK A271 INCREASED UNDERSTANDING OF THE DYNAMICS AND TRANSPORT IN ITB PLASMAS FROM MULTI-MACHINE COMPARISONS.

Date: September 1, 2002

Creator: Gohil, P.; Kinsey, J.; Parail, V.; Litaudon, X.; Fukada, T. & Hoang, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental tests of transport models using modulated ECH

Both the dynamic and equilibrium thermal responses of an L-mode plasma to repetitive ECH heat pulses were measured and compared to predictions from several thermal transport models. While no model consistently agreed with all observations, the GLF23 model was most consistent with the perturbated electron and ion temperature responses for one of the cases studied which may indicate a key role played by electron modes in the core of these discharges. Generally, the IIF and MM models performed wel… more

Date: December 1998

Creator: DeBoo, J. C.; Kinsey, J. E. & Bravenec, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advances in Comprehensive Gyrokinetic Simulations of Transport in Tokamaks

A continuum global gyrokinetic code GYRO has been developed to comprehensively simulate core turbulent transport in actual experimental profiles and enable direct quantitative comparisons to the experimental transport flows. GYRO not only treats the now standard ion temperature gradient (ITG) mode turbulence, but also treats trapped and passing electrons with collisions and finite {beta}, equilibrium ExB shear stabilization, and all in real tokamak geometry. Most importantly the code operates a… more

Date: October 1, 2004

Creator: Waltz, R. E.; Candy, J.; Hinton, F. L.; Estrada-Mila, C. & Kinsey, J. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advances in Comprehensive Gyrokinetic Simulations of Transport in Tokamaks

Date: October 1, 2004

Creator: Waltz, R. E.; Candy, J.; Hinton, F. L.; Estrada-Mila, C. & Kinsey, J. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced Fusion Power Plant Studies. Annual Report for 1999

Significant progress in physics understanding of the reversed shear advanced tokamak regime has been made since the last ARIES-RS study was completed in 1996. The 1999 study aimed at updating the physics design of ARIES-RS, which has been renamed ARIES-AT, using the improved understanding achieved in the last few years. The new study focused on: Improvement of beta-limit stability calculations to include important non-ideal effects such as resistive wall modes and neo-classical tearing modes; U… more

Date: January 1, 2000

Creator: Chan, V. S.; Chu, M. S.; Greenfield, C. M.; Kinsey, J. E. & al., et

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

PTRANSP Tests of TGLF and Predictions for ITER

A new numerical solver for stiff transport predictions has been developed and implemented in the PTRANSP predictive transport code. The TGLF and GLF23 predictive codes have been incorporated in the solver, verified by comparisons with predictions from the XPTOR code, and validated by comparing predicted and measured profiles. Predictions for ITER baseline plasmas are presented.

Date: September 23, 2012

Creator: Budny, Robert V.; Yuan, Xingqiu; Jardin, S.; Hammett, G.; Staebler, G. & Kinsey, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Burning Plasma Projections Using Drift Wave Transport Models and Scalings for the H-Mode Pedestal

OAK-B135 The GLF23 and Multi-Mode (MM95) transport models are used along with a model for the H-mode pedestal to predict the fusion performance for the ITER, FIRE, and IGNITOR tokamak designs. The drift-wave predictive transport models reproduce the core profiles in a wide variety of tokamak discharges, yet they differ significantly in their response to temperature gradient (stiffness). Recent gyro-kinetic simulations of ITG/TEM and ETG modes motivate the renormalization of the GLF23 model. The… more

Date: October 1, 2002

Creator: Kinsey, J. E.; Onjun, T.; Bateman, G.; Kritz, A.; Pankin, A.; Staebler, G. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Physics of Elctron Cyclotron Current Drive on Diii-D

OAK A271 PHYSICS OF ELCTRON CYCLOTRON CURRENT DRIVE ON DIII-D. Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. The measured ECCD efficiency increases as the deposition location is moved towards the inboard midplane or towards smaller minor radius for both co and counter injection. The measured ECCD efficiency also increases with increasing electron density and/or temperature. The expe… more

Date: September 1, 2002

Creator: Petty, C. C.; Prater, R.; Luce, T. C.; Ellis, R. A.; Harvey, R. W.; Kinsey, J. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Physics of Electron Cyclotron Current Drive on Diii-D

OAK A271 PHYSICS OF ELECTRON CYCLOTRON CURRENT DRIVE ON DIII-D. Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. The measured ECCD efficiency increases as the deposition location is moved towards the inboard midplane or towards smaller minor radius for both co and counter injection. The measured ECCD efficiency also increases with increasing electron density and/or temperature. The exp… more

Date: November 1, 2002

Creator: Petty, C. C.; Prater, R.; Luce, T. C.; Ellis, R. A.; Harvey, R. W.; Kinsey, J. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

DETAILED MEASUREMENTS OF THE ELECTRON CYCLOTRON CURRENT DRIVE EFFICIENCY ON DIIID

Electron cyclotron current drive (ECCD) experiments on the DIII-D tokamak are solidifying the physics basis for localized, off-axis current drive, the goal being to validate a predictive model for ECCD. The ECCD profiles are determined from the magnetic field pitch angles measured by motional Stark effect (MSE) polarimetry. The measured ECCD switches from the co to the counter direction as the toroidal injection angle is varied with a profile width that is in accordance with ray tracing calcula… more

Date: May 1, 2002

Creator: Petty, C. C.; Prater, R.; Lohr, J.; Luce, T. C.; Fox, W. R.; Harvey, R. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Detailed Measurements of ECCD Efficiency on DIII-D for Comparison with Theory

No Description Available.

Date: May 1, 2002

Creator: Petty, C. C.; Prater, R.; Lohr, J.; Luce, T. C.; Ellis, R. A.; Harvey, R. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Detailed Measurements of ECCD Efficiency on DIII-D for Comparison with Theory

Recent experiments on the DIII-D tokamak have focused on determining the effect of trapped particles on the electron cyclotron current drive (ECCD) efficiency. Localized power deposition and current drive were observed for both L-mode and ELMing H-mode plasmas. The ECCD efficiency was measured for both co and counter injection. Overall, the experimental ECCD efficiency was in good agreement with the CQL3D Fokker-Planck model over a wide range of injection angles and plasma parameters.

Date: May 1, 2002

Creator: Petty, C. C.; Prater, R.; Lohr, J.; Luce, T. C.; Ellis,III, R. A., Harvey, R. W.; Kinsey, J. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Demonstration in the DIII-D Tokamak of an Alternate Baseline Scenario for ITER and Other Burning Plasma Experiments

OAK A271 DEMONSTRATION IN THE DIII-D TOKAMAK OF AN ALTERNATE BASELINE SCENARIO FOR ITER AND OTHER BURNING PLASMA EXPERIMENTS. Discharges which can satisfy the high gain goals of burning plasma experiments have been demonstrated in the DIII-D tokamak in stationary conditions with relatively low plasma current (q{sub 95} > 4). A figure of merit for fusion gain {Beta}{sub N}H{sub 89}/q{sub 95}{sup 2} has been maintained at values corresponding to Q = 10 operation in a burning plasma for > 6 … more

Date: November 1, 2002

Creator: Luce, T. C.; Wade, M. R.; Ferron, J. R.; Hyatt, A. W.; Kellman, A. G.; Kinsey, J. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

STATIONARY HIGH-PERFORMANCE DISCHARGES IN THE DII-D TOKAMAK

A271 STATIONARY HIGH-PERFORMANCE DISCHARGES IN THE DII-D TOKAMAK. Discharges which can satisfy the high gain goals of burning plasma experiments have been demonstrated in the DIII-D tokamak under stationary conditions at relatively low plasma current (q{sub 95} > 4). A figure of merit for fusion gain ({beta}{sub N}H{sub 89}/q{sub 95}{sup 2}) has been maintained at values corresponding to ! = 10 operation in a burning plasma for > 6 s or 36{tau}{sub E} and 2{tau}{sub R}. The key element is… more

Date: November 1, 2002

Creator: Luce, T. C.; Wade, M. R.; Ferron, J. R.; Hyatt, A. W.; Kellman, A. G.; Kinsey, J. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

TRANSPORT STUDIES IN DIII-D WITH MODULATED ECH

Experiments have been performed where the T{sub e} profile stiffness was tested at several spatial locations by varying the ECH resonance location. Propagation of the pulses was Fourier analyzed and compared to simulations based on several transport models. The plasma appears to be near the critical T{sub e} gradient for ETG modes and marginally stable to ITG modes. However, the local T{sub e} response to a locally applied heat pulse does not indicate a nonlinear, critical gradient model where … more

Date: July 1, 2002

Creator: DeBoo, J. C.; Austin, M. E.; Bravenec, R. V.; Kinsey, J. E.; Lohr, J.; Luce, T. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mechanisms for Electron Transport Barrier Formation in the Diii-D Tokamak

The E x B shear stabilization paradigm explains much of the phenomenology of ion thermal transport in tokamaks. Behavior in the electron channel, however, has continued to challenge our understanding. Recent experiments in DIII-D and elsewhere produce regions where electron thermal transport is almost completely eliminated with intense, localized, direct electron heating. Simulations of DIII-D discharges identify {alpha}-stabilization, local magnetic shear stabilization due to the Shafranov shi… more

Date: February 1, 2001

Creator: Greenfield, C. M.; Prater, R.; Staebler, G. M.; Kinsey, J. E.; Burrell, K. H.; Boo, J. C. De et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent Experimental Studies of Edge and Internal Transport Barriers in the Diii-D Tokamak

Results from recent experiments on the DIII-D tokamak have revealed many important details on transport barriers at the plasma edge and in the plasma core. These experiments include: (a) the formation of the H-mode edge barrier directly by pellet injection; (b) the formation of a quiescent H-mode edge barrier (QH-mode) which is free from edge localized modes (ELMs), but which still exhibits good density and radiative power control; (c) the formation of multiple transport barriers, such as the q… more

Date: August 1, 2002

Creator: Gohil, P.; Baylor, L. R.; Burrell, K. H.; Casper, T. A.; Doyle, E. J.; Greenfield, C. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of Advanced Tokamak Scenario Modeling with Off-Axis Electron Cyclotron Current Drive in DIII-D

The status of modeling work focused on developing the advanced tokamak scenarios in DIII-D is discussed. The objectives of the work are two-fold: (1) 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 (2) to use time-dependent simulations to help plan experiments and to understand the key physics involved. Time-dependent simulations based on transport coefficients derived… more

Date: December 1, 1999

Creator: Murakami, M.; St.John, H. E.; Casper, T. A.; Chu, M. S.; DeBoo, J. C.; Greenfield, C. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

CORE AND EDGE ASPECTS OF QUIESCENT DOUBLE BARRIER OPERATION ON DIII-D.WITH RELEVANCE TO CRITICAL ITB PHYSICS ISSUES

OAK-B135 Recent results from DIII-D address critical internal transport barrier (ITB) research issues relating to sustainability, impurity accumulation and ITB control, and have also demonstrated successful application of general profile control tools. In addition, substantial progress has been made in understanding the physics of the Quiescent Double Barrier (QDB) regime, increasing the demonstrating operating space for the regime and improving performance. Highlights include: (1) a clear demo… more

Date: March 1, 2003

Creator: Doyle, E. J.; Casper, T. A.; Burrell, K. H.; Greenfield, C. M.; West, W. M.; Budny, R. V. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced Tokamak Scenario Modeling with Off-Axix ECH in DIII-D

Time-dependent simulations with transport coefficients derived from experimentally achieved discharges are used to explore the capability of off-axis electron cyclotron current drive (ECCD) to control hollow current profiles in negative central shear discharges. Assuming these transport coefficients remain unchanged at higher EC power levels, the simulation results show that high confinement, high normalized beta and high bootstrap fraction can be achieved with EC power expected to be available… more

Date: July 1, 1999

Creator: Murakami, M.; Casper, T. A.; Lao, L. L.; St. John, H. E.; Deboo, J. C.; Greenfield, C. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department