Behaviour of light and heavy impurities during high-frequency plasma heating in the URAGAN-3 torsatron

Consideration is given to experimental studies on revealing sources and mechanisms of intake of light (oxygen, carbon) and heavy (metal atoms from material of magnetic coinding casing and HF-antenna) impurities during HF plasma heating in the URAGAN-3 torsatron. It is shown that of V=4.4 kGs and antenna voltage of 9.5 kv the main contribution to radiation plasma losses is made by radiation of heavy impurities from periphere plasma regions. Oxygen concentration in plasma periphery increases sufficiently under conditions with V=7 kGs field. It is shown that carbon is intaken to plasma due to physical sputtering of metallic carbon-containing surfaces