Influence of low-frequency MHD bursts on plasma rotation near the peripheral transport barrier in TUMAN-3M tokamak

The experiments described were aimed on investigation of the low frequency MHDactivity burst effect on the ohmic H-mode in the TUMAN-3M tokamak. It was observed thatthe magnetic island structure developing near plasma edge can result in deterioration ofperipheral transport barrier [1]. To clear up a mechanism of MHD burst influence on theH-mode, the plasma rotation evolution has been studied using Doppler reflectometrytechnique [2]. The results obtained, apart from the ohmic H-mode physics, are closelyrelated to plasma rotation evolution near ergodic divertor and stationary magnetic islands ina stellarator.