Injection of electrons with predominantly perpendicular energy into an area of toroidal field ripple in a tokamak plasma to improve plasma confinement
Abstract
An electron injection scheme for controlling transport in a tokamak plasma. Electrons with predominantly perpendicular energy are injected into a ripple field region created by a group of localized poloidal field bending magnets. The trapped electrons then grad-B drift vertically toward the plasma interior until they are detrapped, charging the plasma negative. Calculations indicate that the highly perpendicular velocity electrons can remain stable against kinetic instabilities in the regime of interest for tokamak experiments. The penetration distance can be controlled by controlling the "ripple mirror ratio", the energy of the injected electrons, and their v.sub..perp. /v.sub.51 ratio. In this scheme, the poloidal torque due to the injected radial current is taken by the magnets and not by the plasma. Injection is accomplished by the flat cathode containing an ECH cavity to pump electrons to high v.sub..perp..
- Inventors:
-
- Princeton Junction, NJ
- Princeton, NJ
- Issue Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- OSTI Identifier:
- 868841
- Patent Number(s):
- 5225146
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21B - FUSION REACTORS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- DOE Contract Number:
- AC02-76CH03073
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- injection; electrons; predominantly; perpendicular; energy; toroidal; field; ripple; tokamak; plasma; improve; confinement; electron; scheme; controlling; transport; injected; region; created; localized; poloidal; bending; magnets; trapped; grad-b; drift; vertically; interior; detrapped; charging; negative; calculations; indicate; highly; velocity; remain; stable; kinetic; instabilities; regime; experiments; penetration; distance; controlled; mirror; ratio; perp; 51; torque; due; radial; current; accomplished; flat; cathode; containing; ech; cavity; pump; toroidal field; plasma confinement; field region; poloidal field; tokamak plasma; cathode containing; electron injection; field ripple; injection scheme; /376/
Citation Formats
Ono, Masayuki, and Furth, Harold. Injection of electrons with predominantly perpendicular energy into an area of toroidal field ripple in a tokamak plasma to improve plasma confinement. United States: N. p., 1993.
Web.
Ono, Masayuki, & Furth, Harold. Injection of electrons with predominantly perpendicular energy into an area of toroidal field ripple in a tokamak plasma to improve plasma confinement. United States.
Ono, Masayuki, and Furth, Harold. Fri .
"Injection of electrons with predominantly perpendicular energy into an area of toroidal field ripple in a tokamak plasma to improve plasma confinement". United States. https://www.osti.gov/servlets/purl/868841.
@article{osti_868841,
title = {Injection of electrons with predominantly perpendicular energy into an area of toroidal field ripple in a tokamak plasma to improve plasma confinement},
author = {Ono, Masayuki and Furth, Harold},
abstractNote = {An electron injection scheme for controlling transport in a tokamak plasma. Electrons with predominantly perpendicular energy are injected into a ripple field region created by a group of localized poloidal field bending magnets. The trapped electrons then grad-B drift vertically toward the plasma interior until they are detrapped, charging the plasma negative. Calculations indicate that the highly perpendicular velocity electrons can remain stable against kinetic instabilities in the regime of interest for tokamak experiments. The penetration distance can be controlled by controlling the "ripple mirror ratio", the energy of the injected electrons, and their v.sub..perp. /v.sub.51 ratio. In this scheme, the poloidal torque due to the injected radial current is taken by the magnets and not by the plasma. Injection is accomplished by the flat cathode containing an ECH cavity to pump electrons to high v.sub..perp..},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1993},
month = {Fri Jan 01 00:00:00 EST 1993}
}
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Works referenced in this record:
H-mode behavior induced by cross-field currents in a tokamak
journal, November 1989
- Taylor, R.; Brown, M.; Fried, B.
- Physical Review Letters, Vol. 63, Issue 21