The toroidal magnetized system (TOMAS) plasma facility aims at complementary research on wall conditioning methods, plasma production and plasma–surface interaction studies. This paper explores for the first time the parameters in helium electron-cyclotron resonance (ECR) plasma and combined ECR + radio-frequency (RF) discharges in TOMAS. The ECR discharge in this work, at 2.45 GHz and 87.6 mT, is the main one for creating and maintaining the plasma, while the addition of RF power at 25 MHz allows to broaden the achievable electron temperature and density at a given gas flow, as evidenced by triple Langmuir probe measurements. This effect of the combined ECR + RF discharge provides flexibility to study particular aspects of wall conditioning techniques relevant to larger devices, or to approach plasma conditions relevant to fusion edge plasmas for particular surface interaction studies.
环形磁化系统（TOMAS）等离子体装置旨在对壁 conditioning 方法、等离子体产生及等离子体-表面相互作用研究进行补充性探索。本文首次研究了氦电子回旋共振（ECR）等离子体以及ECR与射频（RF）联合放电在TOMAS中的特性。本工作中的ECR放电（频率2.45 GHz，磁场87.6 mT）是产生并维持等离子体的主要手段，而加入25 MHz的RF功率则能够在给定气体流量下拓宽可实现的电子温度范围，这一点已通过三探针测量得到证实。ECR与RF联合放电的这种效应为实现与大型装置相关的壁 conditioning 技术特定方面的研究提供了灵活性，也可用于接近与聚变边界等离子体相关的等离子体条件，以进行特定的表面相互作用研究。