Large orbit plasma stability theory

A new analysis of the low frequency flute modes for the large ion orbit migma configuration is reported. Results are given for the triple delta distribution function of ions. The theory for the m = 1 mode shows an important reduction of the instability gap, when compared with conventional small Larm...

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Autores principales: Fontan, C.F., Gratton, F.T.
Formato: JOUR
Materias:
Ions
Magnetic Fields
Landau Damping
Migma 4 Experiment
Plasmas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01689002_v271_n1_p100_Fontan
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01689002_v271_n1_p100_Fontan
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spelling todo:paper_01689002_v271_n1_p100_Fontan2023-10-03T15:06:41Z Large orbit plasma stability theory Fontan, C.F. Gratton, F.T. Ions Magnetic Fields Landau Damping Migma 4 Experiment Plasmas A new analysis of the low frequency flute modes for the large ion orbit migma configuration is reported. Results are given for the triple delta distribution function of ions. The theory for the m = 1 mode shows an important reduction of the instability gap, when compared with conventional small Larmor radius treatments. The Migma IV experiment, which did not experience flute instability, was well within the unstable density range of thermal plasma calculations, and partially overlaps or lies below the unstable gap of the new theory. The second part of the paper considers microinstabilities. An explanation of the stabilization, by a negative bias potential, of the Harris instability observed in Migma IV is suggested. A localized unstable radial mode driven by ion counterstreaming at the center is discussed. Single particle orbit behavior for finite p 2 has been studied to ascertain losses that may arise due to stochasticity. Results indicate accurate conservation of the adiabatic invariant for orbits with axial energy up to 25% of the total kinetic energy. Finally, some stability problems of the high density diamagnetic migma regime are outlined. © 1988. Fil:Gratton, F.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01689002_v271_n1_p100_Fontan
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ions
Magnetic Fields
Landau Damping
Migma 4 Experiment
Plasmas
spellingShingle Ions
Magnetic Fields
Landau Damping
Migma 4 Experiment
Plasmas
Fontan, C.F.
Gratton, F.T.
Large orbit plasma stability theory
topic_facet Ions
Magnetic Fields
Landau Damping
Migma 4 Experiment
Plasmas
description A new analysis of the low frequency flute modes for the large ion orbit migma configuration is reported. Results are given for the triple delta distribution function of ions. The theory for the m = 1 mode shows an important reduction of the instability gap, when compared with conventional small Larmor radius treatments. The Migma IV experiment, which did not experience flute instability, was well within the unstable density range of thermal plasma calculations, and partially overlaps or lies below the unstable gap of the new theory. The second part of the paper considers microinstabilities. An explanation of the stabilization, by a negative bias potential, of the Harris instability observed in Migma IV is suggested. A localized unstable radial mode driven by ion counterstreaming at the center is discussed. Single particle orbit behavior for finite p 2 has been studied to ascertain losses that may arise due to stochasticity. Results indicate accurate conservation of the adiabatic invariant for orbits with axial energy up to 25% of the total kinetic energy. Finally, some stability problems of the high density diamagnetic migma regime are outlined. © 1988.
format JOUR
author Fontan, C.F.
Gratton, F.T.
author_facet Fontan, C.F.
Gratton, F.T.
author_sort Fontan, C.F.
title Large orbit plasma stability theory
title_short Large orbit plasma stability theory
title_full Large orbit plasma stability theory
title_fullStr Large orbit plasma stability theory
title_full_unstemmed Large orbit plasma stability theory
title_sort large orbit plasma stability theory
url http://hdl.handle.net/20.500.12110/paper_01689002_v271_n1_p100_Fontan
work_keys_str_mv AT fontancf largeorbitplasmastabilitytheory
AT grattonft largeorbitplasmastabilitytheory
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