THE ELECTRON-CYCLOTRON-RESONANCE HEATING EXPERIMENTS ON HL-1 TOKAMAK

The electron cyclotron resonance heating (ECRH) experiments on HL-1 to kamak with 300 kW of power generated by a gyrotron are described. With ECE diagnostics, a 30% increase of electron temperature has been obta ined. The following phenomena have been observed with various diagnost ics during ECRH: increase of radiation intensity of soft X-ray; amplit ude change and period elongation of sawtooth oscillation; MHD instabil ity suppression; increase of H alpha spectral line intensity and ioniz ed impurity radiation from edge plasma; increase of the temperature an d density of edge plasma. Although the total plasma energy content inc reases, the energy confinement time is decreased. Initial results of l ow voltage start-up experiments have also been obtained.