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Study of Resonance Helical Field on the Zeff and Impurity

j. Study of Resonance Helical Field on the Zeff and Impurity. Radiation in. IR- Tl Tokamak. A. Hojabril, F. Hajakbaril,2, M. Mahmoodi Oarianl,2, M. K. Salem2, M Ghoranneviss2. IPhysics Group, Islamic Azad University, Karaj Branch, P .O.Box 31485-313, Iran.

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Study of Resonance Helical Field on the Zeff and Impurity

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  1. j Study of Resonance Helical Field on the Zeff and Impurity Radiation in IR- Tl Tokamak A. Hojabril, F. Hajakbaril,2, M. Mahmoodi Oarianl,2, M. K. Salem2, M Ghoranneviss2 IPhysics Group, Islamic Azad University, Karaj Branch, P .O.Box 31485-313, Iran. 2Plasma Physics Research Center, Islamic Azad University Science anq Research Campus, P.O.Box 14665-678 Tehran, Iran. . Abstract The effect of resonant helical field (RHF) on effective ion charge, leff, in IR- T I tokamak is studied. The RHF in tokamak is an external magnetic field which can improve the plasma confinement. This field is produced by conductors wound externally around the tokamak torus with a given helicity. In IR-Tl, RHF is generated by two of helical coils installed outside the vacuum vessel. The pulsed dc RHF configuration (e = 2,3) has the optimal current and variable time. Furthermore, by applying RHFs (L=2 and L=3), the sawtooth behavior is modified. The magnitude of the weak RHFs used in our experiments did not exceed 1% of Bp. Results showed that the weak RHFs magnetic perturbation would change the MHO instabilities and the sawtooth behavior, as well as plasma confinement. On the other hand, the effectiveness of the RHF depended on the diSC~ge conditions. The RHFs was not effective in high leff discharges. The RHFs could reduce energy and particle losses.

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