Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device

The rollover of electron density, a common indicator for the onset of volumetric recombination, was observed in hydrogen plasma, for the first time in the DT-ALPHA. Electron density and electron temperature were measured near the plasma production region and secondary gas feeding position with vario...

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Bibliographic Details
Published in:Plasma and Fusion Research 2022/06/22, Vol.17, pp.1201082-1201082
Main Authors: YOSHIMURA, Keigo, TAKAHASHI, Hiroyuki, SEINO, Tomohiro, KUSABIRAKI, Kaoru, SAKATA, Yuki, NISHIMURA, Ryota, MATSUYAMA, Akinobu, TOBITA, Kenji
Format: Article
Language:English
Subjects:
divertor
DT-ALPHA
Electron density
Electron energy
Hydrogen plasma
molecular-activated recombination
Position measurement
radio-frequency plasma
Rollover
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Summary:The rollover of electron density, a common indicator for the onset of volumetric recombination, was observed in hydrogen plasma, for the first time in the DT-ALPHA. Electron density and electron temperature were measured near the plasma production region and secondary gas feeding position with various conditions regarding the amount of hydrogen secondary gas. A rollover of electron density was observed at the secondary gas feeding position, whereas electron density near the plasma production region remained nearly constant. This behavior indicates an enhancement of hydrogen molecular-activated recombination.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.17.1201082