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ICRF heating on TFTR

Description: The objectives of the ICRF heating program on TFTR are discussed along with a summary of the progress made to date towards achieving those goals. A more detailed analysis of experimental observations of ICRF sawtooth stabilization is given along with a comparison of the data to a theoretical model based on energetic ion stabilization of m=1 kink instabilities. A qualitative correlation is observed between the experimental observations and model predictions, but further development of the theory… more
Date: January 1, 1991
Creator: Phillips, C. K.; Fredrickson, E.; Hammett, G.; Hosea, J.; McGuire, K.; Stevens, J. et al.
Partner: UNT Libraries Government Documents Department
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ICRF sawtooth stabilization: Application on TFTR and CIT

Description: The use of ICRF heating to stabilize the core plasma sawtooth relaxations has been extended to TFTR where such stabilization has been produced at relatively low power in the L Mode regime at moderate density (P{sub RF} = 4 MW, 2.6 MW in helium and deuterium discharges, respectively, for the minority hydrogen ICRF heating regime with {bar n}{sub e}{approx}2.5 {times} 10{sup 13} cm{sup {minus}3}). These results, as in the case of those obtained on JET, are qualitatively consistent with energetic … more
Date: March 1, 1991
Creator: Hosea, J. C.; Phillips, C. K.; Stevens, J. E.; Wilson, J. R.; Bell, M.; Boivin, R. et al.
Partner: UNT Libraries Government Documents Department
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Amplification of surface temperature trends and variability in thetropical atmosphere

Description: The month-to-month variability of tropical temperatures is larger in the troposphere than at the Earth's surface. This amplification behavior is similar in a range of observations and climate model simulations, and is consistent with basic theory. On multi-decadal timescales, tropospheric amplification of surface warming is a robust feature of model simulations, but occurs in only one observational dataset. Other observations show weak or even negative amplification. These results suggest that … more
Date: August 11, 2005
Creator: Santer, B. D.; Wigley, T. M. L.; Mears, C.; Wentz, F. J.; Klein, S. A.; Seidel, D. J. et al.
Partner: UNT Libraries Government Documents Department
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Experiments utilizing ICRF heating on TFTR

Description: A variety of experiments have been performed on the TFTR tokamak utilizing ICFR heating. Of special interest has been the insight into plasma performance gained by utilizing a different heating scheme other than the usual NBI. Utilizing ICRF heating allows control over the power deposition profile independent of the plasma fueling profile. In addition, by varying the minority concentration the power split between ion and electron heating can be varied. Confinement has been examined in high recy… more
Date: January 1, 1990
Creator: Wilson, J. R.; Hosea, J. C.; Bell, M. G.; Bitter, M.; Boivin, R.; Fredrickson, E. D. et al.
Partner: UNT Libraries Government Documents Department
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Ion cyclotron range of frequency heating on the Tokamak Fusion Test Reactor

Description: The complete ion cyclotron range of frequency (ICRF) heating system for the Tokamak Fusion Test Reactor (TFTR), consisting of four antennas and six generators designed to deliver 12.5 MW to the TFTR plasma, has now been installed. Recently a series of experiments has been conducted to explore the effect of ICRF heating on the performance of low recycling, Supershot plasmas in minority and non-resonant electron heating regimes. The addition of up to 7.4 MW of ICRF power to full size (R {approxim… more
Date: June 1, 1993
Creator: Taylor, G.; Bell, M. G.; Biglari, H.; Bitter, M.; Bretz, N. L.; Budny, R. et al.
Partner: UNT Libraries Government Documents Department
open access

Physics of High Performance Dueterium-Tritium Plasmas in TFTR

Description: During the past two years, deuterium-tritium (D-T) plasmas in the Tokamak Fusion Test Reactor (TFTR) have been used to study fusion power production,isotope effects associated with tritium fueling, and alpha-particle physics in several operational regimes. The peak fusion power has been increased to 10.7 MW in the supershot mode through the use of increased plasma current and toroidal magnetic field and extensive lithium wall conditioning. The high-internal-inductance (high -li) regime in TFTR … more
Date: January 1996
Creator: McGuire, K. M.; White, R.; Wieland, R. M.; Williams, M.; Wilson, J. R.; Wong, K. L. et al.
Partner: UNT Libraries Government Documents Department
open access

ICRF heating on TFTR-effect on stability and performance

Description: With the addition of two new antennas and two radiofrequency (RF) generators, the TFTR ICRF system is complete. The total complement of four antennas and six generators is designed for 12.5 MW operation. Experiments with this system have been performed recently on TFTR in the low recycling regime to increase the performance of supershot plasmas, in a non-resonant regime to explore electron heating, and in high recycling discharges with energetic ion tails to simulate fusion alpha particles. Not… more
Date: March 1, 1993
Creator: Wilson, J. R.; Bell, M. G.; Biglari, H.; Bitter, M.; Bretz, N. L.; Budny, R. et al.
Partner: UNT Libraries Government Documents Department
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