Characteristic performance of radio-frequency (RF) plasma heating using inverter RF power supplies

• Published in: Electrical engineering in Japan Vol. 138; no. 4; pp. 34 - 41
• Main Authors: Imai, Takahiro, Sawada, Hiroyuki, Hattori, Norifumi, Uesugi, Yoshihiko, Takamura, Shuichi
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 01.03.2002
• Subjects: diverter plasma; inverter power supply; ion cyclotron heating; power balance
• ISSN: 0424-7760; 1520-6416
• DOI: 10.1002/eej.1136

High‐heat‐flux plasmas are produced by high‐power (∼14 kW) ICRF heating using inverter power supplies in the linear diverter simulator NAGDIS‐II. The power flow of radiated RF power is investigated by a calorimetric method. From conventional power calculation using antenna voltage and current, about 70% of the RF power is radiated into the plasma. But the increase of the plasma heat load along the magnetic field by RF heating is about 10% of the RF power. Through this experiment, we find that about half of the RF power is lost at the antenna surface through the formation of RF‐induced sheath, and about 30% of the power is lost into the wall of the vacuum vessel through the charge exchange and elastic collision of ions with neutrals. © 2002 Scripta Technica, Electr Eng Jpn, 138(4): 34–41, 2002; DOI 10.1002/eej.1136