AUTHOR=Takahashi Kazunori , Hanaoka Kengo , Ando Akira 

TITLE=Fast and Automatic Control of a Frequency-Tuned Radiofrequency Plasma Source

JOURNAL=Frontiers in Physics

VOLUME=7

YEAR=2020

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2019.00227

DOI=10.3389/fphy.2019.00227

ISSN=2296-424X

ABSTRACT=<p>A frequency-tuned radiofrequency (rf) plasma source is automatically controlled to minimize the rf power reflection and to maintain the constant net rf power corresponding to the forward power minus the reflected power. The experiment is performed with a power amplifier operational for the frequency of 37–43 MHz, a compact helicon source consisting of a loop antenna, a solenoid, and an insulator tube. The rf power is supplied to the rf antenna via an impedance matching circuit consisting of only fixed small ceramic capacitors. It is demonstrated that the reflection coefficient of the rf power is minimized within ~10 ms, and the net power is successfully maintained at a constant level.</p>