Electron ripple injection concept for tokamak transport control

Journal Article · Thu Feb 01 04:00:00 EST 1996 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.49513· OSTI ID:367109

Choe, W; Ono, M ^[1]; Chang, C S ^[2]

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1. Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)
2. Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, New York 10012 (United States)

A non-intrusive method for inducing a radial electric field ({ital E}{sub {ital r}}) based on electron ripple injection (ERI) is under development by the Princeton CDX-U group. Since {ital E}{sub {ital r}} is known to play an important role in the L-H and H-VH mode transition, it is therefore important to develop a non-intrusive tool to control the {ital E}{sub {ital r}} profile in tokamak plasmas. The present technique utilizes externally-applied local magnetic ripple fields to trap electrons at the edge, allowing them to penetrate towards the plasma center via {nabla}{ital B} and curvature drifts, causing the flux surfaces to charge up negatively. Electron cyclotron resonance heating (ECRH) is utilized to increase the trapped population and the electron drift velocity by raising the perpendicular energy of trapped electrons. The temperature anisotropy of resonant electrons in a tokamak plasma is calculated in order to investigate effects of ECRH on electrons. Simulations using a guiding-center orbit model have been performed to understand the behavior of suprathermal electrons in the presence of ripple fields. Examples for CDX-U and ITER are given. {copyright} {ital 1996 American Institute of Physics.}

• Research Organization: Princeton Plasma Physics Laboratory
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76CH03073; FG02-86ER53223
• OSTI ID: 367109
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 355; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
ECR HEATING
ELECTRIC FIELDS
ELECTRON TEMPERATURE
FOKKER-PLANCK EQUATION
MAGNETIC FIELD RIPPLES
TOKAMAK DEVICES
TRAPPED ELECTRONS