Published October 1976 | Version v1
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Local, ideal and resistive stability in tokamaks with noncircular cross section

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Description

Recently, the conditions for stability of an arbitrarily shaped, finite pressure toroidal plasma against localized ideal and resistive modes were presented. The characteristic time scale for local instability with respect to ideal modes is small compared with that for resistive modes so that an investigation of ideal local stability is a prerequisite for an assessment of nonideal local stability. Here we consider the stability of a particular class of noncircular cross-section tokamak equilibria with respect to such modes. The equilibria are described analytically so that no ordering or expansion procedure is necessary, and both ideal and resistive stability is investigated over the whole plasma region. The effects of plasma shape (vertical elongation and triangularity), as well as aspect-ratio are investigated and particular reference is made to next generation tokamak designs (e.g. JET). (orig.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

Vor kurzem wurden die Stabilitaetsbedingungen eines willkuerlich geformten toroidalen Plasmas endlichen Drucks gegenueber lokalisierten, idealen und widerstandsfaehigen Moden angegeben. Die charakteristische Zeitskala der lokalen Instabilitaet bezueglich der idealen Moden ist klein im Vergleich zur Zeitskala der Widerstandsmoden, so dass eine Untersuchung der idealen lokalen Stabilitaet eine notwendige Voraussetzung zur Festsetzung der nicht idealen lokalen Stabilitaet darstellt. Die Stabilitaet einer besonderen Klasse von Tokamak-Gleichgewichten mit nichtzirkularem Querschnitt werden im Hinblick auf derartige Moden betrachtet. Die Gleichgewichte werden analytisch beschrieben, so dass kein Ordnungs- oder Entwicklungsverfahren notwendig wird. Die ideale und die Widerstandsstabilitaet werden im ganzen Plasmagebiet untersucht. Der Einfluss der Form des Plasmas und des Laengenverhaeltnisses wird untersucht; insbesondere wird auf Tokamakkonstruktionen der naechsten Generation (z.B. JET) hingewiesen. (orig.)

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Additional details

Publishing Information

Imprint Pagination
25 p.
Report number
IPP--III/32

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
8331507
Subject category
S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
Descriptors DEI
ASPECT RATIO; CLOSED CONFIGURATIONS; CROSS SECTIONS; MATHEMATICAL MODELS; PLASMA; PLASMA SIMULATION; SHAPE; STABILITY; TOKAMAK DEVICES; TORI
Descriptors DEC
CLOSED PLASMA DEVICES; CONFIGURATION; MAGNETIC FIELD CONFIGURATIONS; SIMULATION; THERMONUCLEAR DEVICES

Optional Information

Notes
6 figs.; 18 refs.