Published August 1987
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Resonant helical fields in TBR-1
Description
The main characteristics of Mirnov oscillations, sawtooth oscillations and disruptions on the small brazilian tokamak TBR-1 are presented. The alteration of these characteristics caused by helical fields created by external resonant helical windings are also reported. Helical winding current thresholds for the destruction of the magnetic surfaces in TBR-1 caused by the interaction of different resonant fields are estimated. The radial dependence of the perturbations and the change in the shear over the island widths are taken into account. The toroidal corrections are discussed and the exact solution of the Laplaces's equation for the magnetic scalar potential due to toroidal helical current is presented. (author)
Abstract (Portuguese)
Apresentam-se as principais caracteristicas das oscilacoes de Mirnov, oscilacoes denteadas e rupturas no pequeno tokamak brasileiro TBR-1. Sao tambem descritas as alteracoes dessas caracteristicas causadas por campos helicoidais criados por enrolamentos helicoidais ressonantes externos. Estimam-se os limiares de correntes helicoidais para a destruicao das superficies magneticas no TBR-1 causadas pela interacao de diferentes campos ressonantes. A dependencia radial das pertubacoes e a mudanca no corte nas larguras das ilhas sao levadas em consideracao. As correcoes toroidais sao discutidas e a solucao exata da equacao de Laplace para o potencial magnetico escalar devido a correntes helicoidais toroidais e apresentada. (M.W.O.)Files
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Additional details
Publishing Information
- Imprint Pagination
- 12 p.
- Report number
- IFUSP-P--654
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 19064754
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- HELICAL CONFIGURATION; HELICAL INSTABILITY; MAGNETIC ISLANDS; MAGNETIC SURFACES; PLASMA; PLASMA DIAGNOSTICS; PLASMA DISRUPTION; PLASMA INSTABILITY; TOKAMAK DEVICES
- Descriptors DEC
- CLOSED PLASMA DEVICES; CONFIGURATION; INSTABILITY; MAGNETIC FIELD CONFIGURATIONS; PLASMA MACROINSTABILITIES; THERMONUCLEAR DEVICES