在HL-1托卡马克装置上,采用不同频率的微波外差接收机测量欧姆放电下和低混杂波驱动下的非热辐射。文章描述了在欧姆放电下,由磁化等离子体波辐射,相对论电子的契伦柯夫辐射,以及非麦氏分布电子的回旋辐射(ECE)所表现出的反常多卜勒不稳定性特征,即主要表现为磁化等离子体波扰动,以及契伦柯夫辐射迅速下降所对应的ECE增加。这种不稳定性是由于电子分布各向异性所引起的,在低混杂波驱动下不稳定性受到抑制,同时等离子体粒子约束得到改善。讨论了反常多卜勒不稳定性被低混杂波驱动所抑制的可能机制以及与等离子体粒子约束改善之间的关系。 On HL-1 tokamak devices, microwave heterodyne receivers of different frequencies are used to measure non-thermal radiation driven by ohmic discharges and low hybrid noise. The article describes the characteristics of anomalous Doppler instability exhibited by ohmic discharge, by the magnetized plasma wave, the Cherenkov radiation of relativistic electrons, and the non-Maxwellian distribution of electron cyclotron radiation (ECE), that is, Mainly for the perturbation of magnetized plasma wave, and the rapid decrease of Cherenkov radiation corresponding to the increase of ECE. This instability is due to the anisotropy of the electron distribution, which is suppressed by the low hybrid noise and the plasma particle confinement is improved. The possible mechanism of the suppression of abnormal Doppler instability by low hybrid clutter and the relationship between the improved Doppler instability and plasma particle confinement are discussed.