NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The magnetic pumping of plasmas with sawtooth waveformsThe pumping of plasmas by sawtooth-waveform magnetic induction variations is studied theoretically and by means of computer simulations. A sawtooth is a cycle waveform that is characterized by a slow increase in the magnetic induction followed by a rapid drop in the induction. Two types of sawtooth pumping are analyzed, and the types classified as to whether or not the first adiabatic invariants of the plasma particles are conserved during the rapid drops in the magnetic induction. When the invariants are conserved, the sawtooth waveforms are found to be less efficient than square waves for pumping plasmas. When the adiabatic invariations are not conserved, the pumping efficiency is found to be a slight improvement over square waves. Both types of pumping are applied to a hypothetical tokamak plasma and it is concluded that neither type of sawtooth pumping is practical for heating magnetically confined fusion plasmas.
Document ID
19900050586
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Borovsky, Joseph E.
(Los Alamos National Laboratory NM, United States)
Hansen, Paul J.
(Iowa, University Iowa City, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1990
Publication Information
Publication: Physics of Fluids B
Volume: 2
ISSN: 0899-8221
Subject Category
Plasma Physics
Accession Number
90A37641
Funding Number(s)
CONTRACT_GRANT: NAGW-970
CONTRACT_GRANT: NSG-7632
CONTRACT_GRANT: NSF ATM-87-12236
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available