Download or read book Impurity Transport in a Quiescent Tokamak Plasma written by Samuel Alan Cohen and published by . This book was released on 1975 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impurity Transport in a Quiescent Tokamak Plasma written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Short bursts of aluminum were injected into the Adiabatic Toroidal Compressor (ATC) Tokamak, and measured the time evolution of the radial distributions of highly ionized states of aluminum. The results are compared with a computer code describing neoclassical impurity diffusion and good agreement is found. (auth).
Download or read book Numerical Treatment of the Problem of Impurity Transport in Tokamak Plasma written by F. Spineanu and published by . This book was released on 1984 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rotation and Impurity Transport in a Tokamak Plasma with Directed Neutral Beam Injection written by W. M. Stacey (Jr) and published by . This book was released on 1984 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rotation and Impurity Transport in a Tokamak Plasma with Directed Neutral Beam Injection written by Weston M. Stacey and published by . This book was released on 1984 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Orbit Effects on Impurity Transport in a Rotating Tokamak Plasma written by K. L. Wong and published by . This book was released on 1988 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Orbit Effects on Impurity Transport in a Rotating Tokamak Plasma written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle orbits in a rotating tokamak plasma are calculated from the equation of motion in the frame that rotates with the plasma. It is found that heavy particles in a rotating plasma can drift away from magnetic surfaces significantly faster with a higher bounce frequency, resulting in a diffusion coefficient much larger than that for a stationary plasma. Particle orbits near the surface of a rotating tokamak are also analyzed. Orbit effects indicate that more impurities can penetrate into a plasma rotating with counter-beam injection. Particle simulation is carried out with realistic experimental parameters and the results are in qualitative agreement with some experimental observations in the Tokamak Fusion Test Reactor (TFTR). 19 refs., 15 figs.
Download or read book On Impurity Transport in Tokamaks written by Fredrick H. Seguin and published by . This book was released on 1982 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book QUIESCENT DOUBLE BARRIER H MODE PLASMAS IN THE DIII D TOKAMAK written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: High confinement (H-mode) operation is the choice for next-step tokamak devices based either on conventional or advanced tokamak physics. This choice, however, comes at a significant cost for both the conventional and advanced tokamaks because of the effects of edge localized modes (ELMs). ELMs can produce significant erosion in the divertor and can affect the beta limit and reduced core transport regions needed for advanced tokamak operation. Experimental results from DIII-D[J.L. Luxon, et al., Plasma Phys. and Contr. Nucl. Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987) Vol. I, p. 159] this year have demonstrated a new operating regime, the quiescent H-mode regime, which solves these problems. We have achieved quiescent H-mode operation which is ELM-free and yet has good density and impurity control. In addition, we have demonstrated that an internal transport barrier can be produced and maintained inside the H-mode edge barrier for long periods of time (>3.5 seconds or>25 energy confinement times[tau][sub E]), yielding a quiescent double barrier regime. By slowly ramping the input power, we have achieved[beta][sub N] H[sub 89]= 7 for up to 5 times the[tau][sub E] of 150 ms. The[beta][sub N] H[sub 89] values of 7 substantially exceed the value of 4 routinely achieved in standard ELMing H-mode. The key factors in creating the quiescent H-mode operation are neutral beam injection in the direction opposite to the plasma current (counter injection) plus cryopumping to reduce the density. Density and impurity control in the quiescent H-mode is possible because of the presence of an edge magnetic hydrodynamic (MHD) oscillation, the edge harmonic oscillation, which enhances the edge particle transport while leaving the energy transport unaffected.
Download or read book Energy and Impurity Transport in the Alcator C Tokamak written by Alcator Group and published by . This book was released on 1982 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Density Asymmetries on Heavy impurity Transport in a Rotating Tokamak plasma written by M. Romanelli and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sawteeth induced Impurity Transport in Tokamak Plasmas written by A. Ödblom and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Z Impurity Transport in Tokamaks written by R. J. Hawryluk and published by . This book was released on 1978 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impurity Transport in Tokamaks written by Paul Harding Rutherford and published by . This book was released on 1976 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impurity Transport Studies in Tokamak Edge Plasmas Using Visibe Imaging written by Sanjay Gangadhara and published by . This book was released on 2001 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding impurity transport in the scrape-off layer (SOL) of tokamak plasmas is a necessary piece of developing the physics basis for designing next-generation reactors. A system for inferring impurity transport parallel and perpendicular to local magnetic field lines has been developed on Alcator C-Mod using gas-injection "plumes". In this system, impurity gas is injected at a fixed position in the SOL via a reciprocating fast-scanning probe, and the resulting emission is imaged. In this paper visible light emission patterns from C+1 and C+2 ions are presented.
Download or read book Impurity Transport in Tokamaks written by Paul Harding Rutherford and published by . This book was released on 1976 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observation of Neoclassical like Impurity Transport in the Q Less Than Or Equal to 1 Region of the PBX Tokamak written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Charge-dependent convective impurity transport is observed in the central core of PBX H-mode discharges by measuring radial profiles for both low- and high-Z intrinsic impurities in the presence of strong sawtooth activity. Transport coefficients are derived by simulating the data with a diffusive/convective transport model which includes an internal disruption model. The time evolving Z/sub eff/ profile and central metallic densities are fitted during the quiescent phase between internal disruptions to yield a diffusion coefficient of D = 1 x 103 cm2/s for all species and an inward convective speed of v = 2.2 x 102 (r/a) cm/s for oxygen and carbon and v = 1.1 x 103 (r/a) cm/s for metals. These transport coefficients are in quantitative agreement with simple cylindrical neoclassical estimates for the region within q less than or equal to 1. 17 refs., 4 figs.
