Internal disruptions and RHF in IR-T1 tokamak

Conference · Mon Dec 30 23:00:00 EST 1996

OSTI ID:423070

Ghoranneviss, M; Masnavi, M; Khademian, A ^[1]

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1. I.A.U., Tehran (Iran, Islamic Republic of). Plasma Physics Research Center

Sawtooth oscillations are observed on IR-T1 Tokamak during low ql discharge with a disruption time of about 30--60 {micro}s. The q = 1 singular surface occurs at radius 3--3.5 cm and inverted Sawtooth from chords outside this radius. The superimposed (m = 1) oscillation with a frequency of about 19 kHz {approx} 25 kHz, according to the tokamak discharges parameters, preceding the Sawtooth oscillation. One major effect the Sawtooth oscillation is to flatten the temperature and density profiles approximately out to a mixing radius rm = {radical}2 rs,. Furthermore, by applying RHFs (L = 2 and L = 3), the Sawtooth behavior is modified. The magnitude of the weak RHFs used in the experiments did not exceed 1% of Bp. Results showed that the weak RHFs magnetic perturbation would change the MHD instabilities and the Sawtooth behavior, as well as plasma, confinement.

• OSTI ID: 423070
• Report Number(s): CONF-960634--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ENERGY LOSSES
MAGNETIC FIELD CONFIGURATIONS
PLASMA DENSITY
PLASMA DISRUPTION
SAWTOOTH OSCILLATIONS
TOKAMAK DEVICES