The high magnetic field helicon experiment system is a helicon wave plasma (HWP) source device in a high axial magnetic field ( B 0) developed for plasma-wall interactions studies for fusion reactors. This HWP was realized at low pressure (5 ×10-3 10 Pa) and a RF (radio frequency, 13.56 MHz) power (maximum power of 2 kW) using an internal right helical antenna (5 cm in diameter by 18 cm long) with a maximum B 0 of 6300 G. Ar HWP with electron density ∼1018-1020 m-3 and electron temperature ∼4-7 eV was produced at high B 0 of 5100 G, with an RF power of 1500 W. Maximum Ar+ ion flux of 7.8 ×1023 m-2s-1 with a bright blue core plasma was obtained at a high B 0 of 2700 G and an RF power of 1500 W without bias. Plasma energy and mass spectrometer studies indicate that Ar+ ion-beams of 40.1 eV are formed, which are supersonic (∼3.1c s). The effect of Ar HWP discharge cleaning on the wall conditioning are investigated by using the mass spectrometry. And the consequent plasma parameters will result in favorable wall conditioning with a removal rate of 1.1 ×1024 N2/m2h.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- helicon wave plasma
- high magnetic field
- wall conditioning