Plasma and Fusion Research
Volume 14, 1201165 (2019)
Rapid Communications
- Nagoya University, Nagoya 464-8603, Japan
- 1)
- National Institute for Fusion Science, Toki 509-5292, Japan
- 2)
- Kyushu University, Kasuga 816-8580, Japan
Abstract
A high dispersion and high time-resolution spectrometer equipped with two slits in output ports is developed to observe variation of Doppler broadening in the high-temperature bubbles [K. Terasaka, et. al., Phys. Plasmas 25, 052113 (2018)]. Reduction of Doppler broadening in a line spectrum of helium ion is experimentally observed when the bubbles emerge in the viewing chord of spectrometer. The results suggest possibilities of ion temperature reduction during the high-temperature bubbles.
Keywords
ion temperature, high-temperature bubble, electron cyclotron resonance plasma, Doppler spectroscopy, conditional average