PFC / JA - 96 - 29 H Mode Confinement in Alcator C - Mod
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چکیده
A series of experiments, examining the confinement properties of ICRF heated H-mode plasmas, has been carried out on the C-Mod tokamak. C-Mod is a compact tokamak which operates at high particle, power, and current densities at toroidal fields up to 8T. Under these conditions the plasma is essentially thermal with very little contribution to the stored energy from energetic ions (typically no more than 5%) and with Ti~Te. Most of the data were taken with the machine in a single-null "closed" divertor configuration with the plasma facing components clad in molybdenum tiles. The data include those taken both before and after the first wall surfaces were coated with boron, with emphasis on the latter. H-modes obtained from plasmas run on boronized walls typically had lower impurity content and radiated power and attained higher stored energy than those run on bare molybdenum. Confinement enhancement, the energy confinement time normalized to L-mode scaling, for discharges with boronized walls, ranged from 1.6 to 2.4. The unique operating regime of the C-Mod device provided a means for extending the
منابع مشابه
PFC / JA - 96 - 39 ICRF Heating Scenarios on Alcator C - Mod
Successful high power ICRF heating of L-mode and H-mode plasmas has been performed in the Alcator C-Mod tokamak with up to 3.5 MW of RF power at 80 MHz. Efficient absorption (90-100%) of the RF power was observed for D(H) heating at 5.3 T (here the minority ion species is indicated parenthetically). Lower single-pass absorption experiments were also performed in D(3He) at 7.9 T, D( 2 13He) at 4...
متن کاملPFC / JA - 96 - 9 Survey of ICRF Heating Experiments and Enhanced Performance Modes in Alcator C - Mod
Results of ICRF heating experiments in Alcator C-Mod during the November 1994 June 1995 campaign are summarized. Efficient heating of high density ( , ; 3 x 1020 m-3 ) plasmas was demonstrated with high power densities (up to 5 MW/m 3 volume averaged, 0.6 MW/m 2 surface averaged). These experiments were carried out with RF powers up to 3.5 MW at 80 MHz, at magnetic fields up to 8 T and plasma c...
متن کاملPSFC / JA - 99 - 15 Plasma Rotation During Ohmic H - modes in Alcator C - Mod Tokamak
Core plasma rotation is observed to change from the counter-to co-current direction during the transition from low (L) to high (H) confinement mode, in Alcator C-Mod plasmas that are heated purely ohmically. The changes of the toroidal velocities deduced from impurity Doppler measurements and magnetic perturbations associated with "sawteeth" are quantitatively similar. The magnitude of the chan...
متن کاملPSFC / JA - 05 - 46 Advances in measurement and modeling of the high - confinement - mode pedestal on the Alcator C - Mod tokamak
Edge transport barrier (ETB) studies on the Alcator C-Mod tokamak [Phys. Plasmas 1, 1511, (1994)] investigate pedestal scalings and radial transport of plasma and neutrals. Pedestal profiles show trends with plasma operational parameters such as total current IP . A ballooning-like I2 P dependence is seen in the pressure gradient, despite calculated stability to ideal ballooning modes. A simila...
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تاریخ انتشار 2014