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Erba, M.; Mattioli, M.; Segui, J.L.
Association Euratom-CEA, CEA Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee1997
Association Euratom-CEA, CEA Cadarache, 13 - Saint-Paul-lez-Durance (France). Dept. de Recherches sur la Fusion Controlee1997
AbstractAbstract
[en] This paper addresses the problem of removing sawtooth oscillations from multichannel plasma data in a self-consistent way, thereby preserving transients that have a different physical origin. The technique which does this is called the Generalized Singular Value Decomposition (GSVD), and its properties are discussed. Using the GSVD, we analyze spatially resolved electron temperature measurements from the Tore Supra tokamak, made in transient regimes that are perturbed either by the laser blow-off injection of impurities or by pellet injection. Non-local transport issues are briefly discussed. (author)
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Oct 1997; 16 p; 33 refs.
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Burma, C.; Cuperman, S.; Komoshvili, K.
Israel Physical Society 44. annual meeting. Program and abstracts1998
Israel Physical Society 44. annual meeting. Program and abstracts1998
AbstractAbstract
[en] The Alfven wave current drive (AWCD) in small aspect ratio Tokamaks is properly calculated, with consideration of the basic toroidicity effects present in (i) the dielectric tensor-operator (involving the strongly toroidal equilibrium profiles), (ii) the structure of the r.f. fields obtained as a solution of the wave equation (through Maxwell's equations' toroidal operators as well as the conversion rate and conversion layer location, depending also on the equilibrium profiles) and (iii) the formulation of the AWCD (which, besides its dependence on the r.f. fields - affected by toroidicity as mentioned at points (i) and (ii) - also requires the equilibrium-magnetic-surface averaging of non-resonant forces involved). Thus, we consider consistent equilibrium profiles with neo-classical conductivity corresponding to an ohmic START-like discharge; use a resistive (anisotropic) MHD dielectric tensor-operator Edith practically no limitations, adequate to describe the plasma response in the pre-heated stage ; solve numerically the 2(1/2)D full- wave equation by the aid of an advanced finite element code developed in; and evaluate the AWCD by the aid of the recently proposed, quite general formulation holding in the case of strongly toroidal fusion devices and including contributions due to helicity injection, momentum transfer and plasma Bow. A general discussion of the results obtained in this work is presented
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Weizmann Institute of Science, The Faculty of Physics, Rehovot (Israel); 196 p; 8 Apr 1998; p. 167; 44. annual meeting of the Israel Physical Society; Rehovot (Israel); 8 Apr 1998
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AbstractAbstract
[en] This final report is comprised of the following six progress reports: Ion Temperature Gradient Instability and Anomalous Transport, July 1989; Ion Temperature Gradient Instability and Anomalous Transport, August 1991; Ion Temperature Gradient Instability and Anomalous Transport, July 1993; Ion Anomalous Transport and Feedback Control, May 1994; Ion Anomalous Transport and Feedback Control, April 1995; and Ion Anomalous Transport and Feedback Control, December 1997
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Jan 1998; 44 p; CONTRACT FG02-87ER53257; ALSO AVAILABLE FROM OSTI AS DE98004189; NTIS; INIS; US GOVT. PRINTING OFFICE DEP
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Lazzaro, E.; Campbell, D.; Debenedetti, M.; Santagiustina, A.
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
AbstractAbstract
No abstract available
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Goutych, I.F.; Gresillon, D.; Sitenko, A.G.; AN Ukrainy, Kiev (Ukraine). Inst. Teoreticheskoj Fiziki; 488 p; 1996; p. 45; 23. European physical society conference on controlled fusion and plasma physics; Kyiv (Ukraine); 24-28 Jun 1996
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Rewoldt, G.; Tang, W.M.
Princeton Univ., Princeton Plasma Physics Lab., NJ (United States); General Atomics, San Diego, CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1997
Princeton Univ., Princeton Plasma Physics Lab., NJ (United States); General Atomics, San Diego, CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1997
AbstractAbstract
[en] The microinstability properties of discharges with negative (reversed) magnetic shear in the Tokamak Fusion Test Reactor (TFTR) and DIII-D experiments with and without confinement transitions are investigated. A comprehensive kinetic linear eigenmode calculation employing the ballooning representation is employed with experimentally measured profile data, and using the corresponding numerically computed magnetohydrodynamic (MHD) equilibria. The instability considered is the toroidal drift mode (trapped-electron-ηi mode). A variety of physical effects associated with differing q-profiles are explained. In addition, different negative magnetic shear discharges at different times in the discharge for TFTR and DIII-D are analyzed. The effects of sheared toroidal rotation, using data from direct spectroscopic measurements for carbon, are analyzed using comparisons with results from a two-dimensional calculation. Comparisons are also made for nonlinear stabilization associated with shear in Er/RBθ. The relative importance of changes in different profiles (density, temperature, q, rotation, etc.) on the linear growth rates is considered
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Mar 1997; 32 p; CONTRACT AC02-76CH03073; AC03-89ER51114; ALSO AVAILABLE FROM OSTI AS DE97052319; NTIS; INIS; ALSO AVAILABLE FROM THE FOLLOWING URL: HTTP://WWW.PPPL.GOV. SEE PPPL REPORTS SECTION FOR FULL TEXT.; US GOVT. PRINTING OFFICE DEP
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Brusehaber, B.; Kramer, M.; Gusakov, E.Z.; Kaganskaya, N.M.; Selenin, V.L.
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
Abstracts of the 23rd European physical society conference on controlled fusion and plasma physics1996
AbstractAbstract
No abstract available
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Goutych, I.F.; Gresillon, D.; Sitenko, A.G.; AN Ukrainy, Kiev (Ukraine). Inst. Teoreticheskoj Fiziki; 488 p; 1996; p. 378; 23. European physical society conference on controlled fusion and plasma physics; Kyiev (Ukraine); 24-28 Jun 1996
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Anisimov, I.O.; Dovbakh, S.V.; Kotlyarov, L.Yu.; Levitsky, S.M.; Lizunov, G.V.; Opanasenko, O.V.; Palets, D.B.; Romanyuk, L.L.
Abstracts of the 23rd European physical society conference on controlled fussion and plasma physics1996
Abstracts of the 23rd European physical society conference on controlled fussion and plasma physics1996
AbstractAbstract
No abstract available
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Goutych, I.F.; Gresillon, D.; Sitenko, A.G.; AN Ukrainskoj SSR, Kiev (Ukraine). Inst. Teoreticheskoj Fiziki; 488 p; 1996; p. 465; 23. European physical society conference on controlled fusion and plasma physics; Kiyev (Ukraine); 24-28 Jun 1996
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Garofalo, A.M.; Turnbull, A.D.; Strait, E.J.
General Atomics, San Diego, CA (United States); Columbia Univ., New York, NY (United States); Univ. of Texas, Austin, TX (United States); Princeton Univ., Princeton Plasma Physics Lab., NJ (United States); Oak Ridge National Lab., TN (United States); Lawrence Livermore National Lab., CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1999
General Atomics, San Diego, CA (United States); Columbia Univ., New York, NY (United States); Univ. of Texas, Austin, TX (United States); Princeton Univ., Princeton Plasma Physics Lab., NJ (United States); Oak Ridge National Lab., TN (United States); Lawrence Livermore National Lab., CA (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1999
AbstractAbstract
[en] One promising approach to maintaining stability of high beta tokamak plasmas is the use of a conducting wall near the plasma to stabilize low-n ideal MHD instabilities. However, with a resistive wall, either plasma rotation or active feedback control is required to stabilize the more slowly growing resistive wall modes (RWMs). Experiments in the DIII-D, PBHX-M, and HBT-EP tokamaks have demonstrated that plasmas with a nearby conducting wall can remain stable to the n = 1 ideal external kink above the beta limit predicted with the wall at infinity, with durations in DIII-D up to 30 times τw, the resistive wall time constant. More recently, detailed, reproducible observation of the n = 1 RWM has been possible in DIII-D plasmas above the no-wall beta limit. The DIII-D measurements confirm characteristics common to several RWM theories. The mode is destabilized as the plasma rotation at the q = 3 surface decreases below a critical frequency of 1 to 7 kHz. The measured mode growth times of 2 to 8 ms agree with measurements and numerical calculations of the dominant DIII-D vessel eigenmode time constants, τw. From its onset, the RWM has little or no toroidal rotation and rapidly reduces the plasma rotation to zero. Both DIII-D and HBT-EP have adopted the smart shell concept as an initial approach to control of these slowly growing RWMs; external coils are controlled by a feedback loop designed to make the resistive wall appear perfectly conducting by maintaining a net zero radial field at the wall. Initial experiment results from DIII-D have yielded encouraging results
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Jan 1999; 17 p; 40. annual physics of plasmas meeting, APS Division of Plasma Physics; New Orleans, LA (United States); 16-20 Nov 1998; CONF-981127--; CONTRACT FG02-89ER53297; FG03-97ER54415; AC03-89ER51114; AC02-76CH03073; AC05-96OR22464; W-7405-ENG-48; ALSO AVAILABLE FROM OSTI AS DE99001451; NTIS; US GOVT. PRINTING OFFICE DEP
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Held, E.D.; Leboeuf, J.N.; Carreras, B.A.
Univ. of Wisconsin, Center for Plasma Theory and Computation, Madison, WI (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1998
Univ. of Wisconsin, Center for Plasma Theory and Computation, Madison, WI (United States). Funding organisation: USDOE Office of Energy Research, Washington, DC (United States)1998
AbstractAbstract
[en] The linear and nonlinear stability of a nonmonotonic q profile is examined using a reduced set of magnetohydrodynamic (MHD) equations with an equilibrium, sheared toroidal flow. The reversed shear profile is shown to be unstable to a rich variety of resistive MHD modes including pressure-driven instabilities and tearing instabilities possessing a tearing/interchange character at low Lundquist number, S, and taking on a double/triple tearing structure at high S. Linear calculations show that the destabilizing effect of toroidal velocity shear on tearing modes is enhanced at finite pressure seen previously for tearing modes at high S. Nonlinear calculations show the generation of a large, m = 1, n = 0, Reynolds-stress-driven poloidal flow in the absence of significant flow damping. Calculations in which the poloidal flow was heavily damped show that sub-Alfvenic, sheared toroidal flows have a minimal effect on weakly-coupled, localized instabilities
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Jul 1998; 37 p; ALSO AVAILABLE FROM OSTI AS DE99001534; NTIS; US GOVT. PRINTING OFFICE DEP
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Mamun, A.A.; Russel, S.M.; Mendoza-Briceno, C.A.; Alam, M.N.; Datta, T.K.; Das, A.K.
Abdus Salam International Centre for Theoretical Physics, Trieste (Italy)1999
Abdus Salam International Centre for Theoretical Physics, Trieste (Italy)1999
AbstractAbstract
[en] A rigorous theoretical investigation has been made of multi-dimensional instability of obliquely propagating electrostatic solitary structures in a hot magnetized nonthermal dusty plasma which consists of a negatively charged hot dust fluid, Boltzmann distributed electrons, and nonthermally distributed ions. The Zakharov-Kuznetsov equation for the electrostatic solitary structures that exist in such a dusty plasma system is derived by the reductive perturbation method. The multi-dimensional instability of these solitary waves is also studied by the small-k (long wavelength plane wave) perturbation expansion method. The nature of these solitary structures, the instability criterion, and their growth rate depending on dust-temperature, external magnetic field, and obliqueness are discussed. The implications of these results to some space and astrophysical dusty plasma situations are briefly mentioned. (author)
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May 1999; 17 p; 41 refs, 8 figs
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