Sawteeth In The Mst Reversed Field Pinch
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Sawteeth In The Mst Reversed Field Pinch
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Author : Jeffrey Andrew Beckstead
language : en
Publisher:
Release Date : 1990
Sawteeth In The Mst Reversed Field Pinch written by Jeffrey Andrew Beckstead and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Magnetic Reconnection In Mst Reversed Field Pinch
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Author : Neal Acker Crocker
language : en
Publisher:
Release Date : 2001
Magnetic Reconnection In Mst Reversed Field Pinch written by Neal Acker Crocker 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.
Fluctuation Reduction And Enhanced Confinement In The Mst Reversed Field Pinch
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Author :
language : en
Publisher:
Release Date : 2001
Fluctuation Reduction And Enhanced Confinement 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 2001 with categories.
Plasmas with a factor of[ge]3 improvement in energy confinement have been achieved in the MST reversed-field pinch (RFP). These plasmas occur spontaneously, following sawtooth crashes, subject to constraints on, eg, toroidal magnetic field reversal and wall conditioning. Possible contributors to the improved confinement include a reduction of core-resonant, global magnetic fluctuations and a reduction of electrostatic fluctuations over the entire plasma edge. One feature of these plasmas is a region of strong ExB flow shear in the edge. Never before observed in conjunction with enhanced confinement in the RFP, such shear is common in enhanced confinement discharges in tokamaks and stellarators. Another feature of these plasmas is a new type of discrete dynamo event. Like sawtooth crashes, a common form of discrete dynamo, these events correspond to bursts of edge parallel current. The reduction of electrostatic fluctuations in these plasmas occurs within and beyond the region of strong ExB flow shear, similar to what is observed in tokamaks and stellarators. However, the reductions in the MST include fluctuations whose correlation lengths are larger than the width of the shear region. The reduction of the global magnetic fluctuations is most likely due to flattening of the[mu]=[mu][sub 0][rvec J][center-dot][rvec B]/B[sup 2] profile. Flattening can occur, eg, due to the new type of discrete dynamo event and reduced edge resistivity. Enhanced confinement plasmas are also achieved in the MST when auxiliary current is applied to flatten the[mu] profile and reduce magnetic fluctuations. Unexpectedly, these plasmas also exhibit a region (broader than in the case above) of strong ExB flow shear in the edge, an edge-wide reduction of electrostatic fluctuations, and the new type of discrete dynamo event. Auxiliary current drive has historically been viewed as the principal route to fusion reactor viability for the RFP.
Fast Flow Phenomena In The Mst Reversed Field Pinch
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Author :
language : en
Publisher:
Release Date : 2001
Fast Flow Phenomena 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 2001 with categories.
We have obtained these key results from the MST RFP: (1) The toroidal velocity fluctuations of the plasma are coherent with the large-scale magnetic tearing modes; during a sawtooth event the scalar product of v[sub[phi]] and B[sub r] is similar to that expected for the MHD dynamo electromotive force. (2) Non-resonant external field errors do not cause magnetic mode locking. (3) Toroidal plasma flow closely tracks the toroidal rotation of the magnetic tearing modes, including the fast changes that occur during sawtooth and locking events. (4) The sawtooth change in mode rotation and plasma flow is not caused by external electromagnetic torque. (5) Plasma flow and mode rotation can be actively controlled, including rotation reversal and unlocking, by modifying E[sub r] with a biased probe or plasma source electrode.
Fluctuation Reduction And Enhanced Confinement In The Mst Reversed Field Pinch
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Author : Brett Edward Chapman
language : en
Publisher:
Release Date : 1997
Fluctuation Reduction And Enhanced Confinement In The Mst Reversed Field Pinch written by Brett Edward Chapman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with 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.
Locked Modes And Magnetic Field Errors In Mst
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Author :
language : en
Publisher:
Release Date : 1992
Locked Modes And Magnetic Field Errors In Mst 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.
In the MST reversed field pinch magnetic oscillations become stationary (locked) in the lab frame as a result of a process involving interactions between the modes, sawteeth, and field errors. Several helical modes become phase locked to each other to form a rotating localized disturbance, the disturbance locks to an impulsive field error generated at a sawtooth crash, the error fields grow monotonically after locking (perhaps due to an unstable interaction between the modes and field error), and over the tens of milliseconds of growth confinement degrades and the discharge eventually terminates. Field error control has been partially successful in eliminating locking.
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.
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.
Origin Of Tearing Mode Excitation In The Mst Reversed Field Pinch
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Author : Seung-Ho Choi
language : en
Publisher:
Release Date : 2006
Origin Of Tearing Mode Excitation In The Mst Reversed Field Pinch written by Seung-Ho Choi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.