Ion Heating And Mhd Dynamo Fluctuations In The Reversed Field Pinch
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Ion Heating And Mhd Dynamo Fluctuations In The Reversed Field Pinch
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Author :
language : en
Publisher:
Release Date : 1992
Ion Heating And Mhd Dynamo Fluctuations In The Reversed Field Pinch written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Ion temperature measurements, time resolved to 10 [mu]s, have been made in the Madison Symmetric Torus reversed-field pinch with a five channel charge exchange analyzer. The ion temperature, T{sub i} ≈ 200 eV for I = 350 kA, increases by as much as 100% during discrete dynamo bursts in MST discharges. Magnetic field fluctuations in the range 0.5--5 MHz were also measured. Structure in the fluctuation frequency spectrum at the ion cyclotron frequency appears as the bursts terminate, suggesting that the mechanism of ion heating involves the dissipation of dynamo fluctuations at ion gyro-orbit scales.
Ion Heating And Mhd Dynamo Fluctuations In The Reversed Field Pinch
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Author : Earl Edward Scime
language : en
Publisher:
Release Date : 1992
Ion Heating And Mhd Dynamo Fluctuations In The Reversed Field Pinch written by Earl Edward Scime and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Spectroscopic Measurement Of The Mhd Dynamo In The Mst Reversed Field Pinch
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Author :
language : en
Publisher:
Release Date : 1998
Spectroscopic Measurement Of The Mhd Dynamo In The Mst Reversed Field Pinch written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The author has directly observed the coupling of ion velocity fluctuations and magnetic field fluctuations to produce an MHD dynamo electric field in the interior of the MST reversed field pinch. Chord averaged ion velocity fluctuations were measured with a fast spectroscopic diagnostic which collects line radiation from intrinsic carbon impurities simultaneously along two lines of sight. The chords employed for the measurements resolved long wavelength velocity fluctuations of several km/s at 8--20 kHz as tiny, fast Doppler shifts in the emitted line profile. During discrete dynamo events the velocity fluctuations, like the magnetic fluctuations, increase dramatically. The toroidal and poloidal chords with impact parameters of 0.3 a and 0.6 a respectively, resolved fluctuation wavenumbers with resonance surfaces near or along the lines of sight indicating a radial velocity fluctuation width for each mode which spans only a fraction of the plasma radius. The phase between the measured toroidal velocity fluctuations and the magnetic fluctuations matches the predictions of resistive MHD while the poloidal velocity fluctuations exhibit a phase consistent with the superposition of MHD effects and the advection of a mean flow gradient past the poloidal line of sight. Radial velocity fluctuations resolved by a chord through the center of the plasma were small compared to the poloidal and toroidal fluctuations and exhibited low coherence with the magnetic fluctuations. The ensembled nonlinear product of the ion velocity fluctuations and fluctuations in the magnetic field indicates a substantial dynamo electric field which peaks during the periods of spontaneous flux generation.
Advances In Reversed Field Pinch Theory And Computation
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Author :
language : en
Publisher:
Release Date : 1992
Advances In Reversed Field Pinch Theory And Computation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Advances in theory and computations related to the reversed field pinch (RFP) are presented. These are: (1) the effect of the dynamo on thermal transport; (2) a theory of ion heating due to dynamo fluctuations; (3) studies of active and passive feedback schemes for controlling dynamo fluctuations; and (4) an analytic model for coupled g-mode and rippling turbulence in the RFP edge.
Dynamo And Anomalous Transport In The Reversed Field Pinch
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Author :
language : en
Publisher:
Release Date : 1998
Dynamo And Anomalous Transport In The Reversed Field Pinch written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The reversed field pinch is an effective tool to study the macroscopic consequences of magnetic fluctuations, such as the dynamo effect and anomalous transport. Several explanations exist for the dynamo (the self-generation of plasma current)--the MHD dynamo, the kinetic dynamo, and the diamagnetic dynamo. There is some experimental evidence for each, particularly from measurements of ion velocity and electron pressure fluctuations. Magnetic fluctuations are known to produce energy and particle flux in the RFP core. Current profile control is able to decrease fluctuation-induced transport by a factor of five. Improved confinement regimes are also obtained at deep reversal and, possibly, with flow shear.
Energy Research Abstracts
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Author :
language : en
Publisher:
Release Date : 1995
Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Power resources categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Plasma Rotation Dynamo And Nonlinear Coupling In The Reversed Field Pinch
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Author :
language : en
Publisher:
Release Date : 2001
Plasma Rotation Dynamo And Nonlinear Coupling In The Reversed Field Pinch written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Two important effects of MHD fluctuations in the RFP and tokamak are current generation (the dynamo effect) and mode locking. In the T1 and MST RFP experiments new results reveal the mode dynamics underlying these phenomena. In T1 the effect of specific magnetic Fourier modes on the current density profile is evident. In MST, the MHD dynamo term ([delta]v x[delta]B) is measured in the plasma edge, and found to account for the time dependence of the edge current throughout a sawtooth cycle. As edge resistivity is increased in T1 the fluctuation amplitude increases to maintain the dynamo-driven current, as expected from MHD computation. The modes responsible for the dynamo often lock to the local magnetic field error at the vertical cut in MST. The plasma rotation velocity has been measured with a fast Doppler spectrometer to a time resolution of 1[mu]s. The plasma rotation and mode phase velocity are remarkably well-correlated, with both slowing, in the presence of an impulsive field error, in a 100[mu]s timescale.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1993
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Physics categories.
Spectroscopic Measurement Of The Mhd Dynamo In The Mst Reversed Field Pinch
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Author : James Tharp Chapman
language : en
Publisher:
Release Date : 1998
Spectroscopic Measurement Of The Mhd Dynamo In The Mst Reversed Field Pinch written by James Tharp Chapman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.