Upgraded millimeter-wave interferometer for measuring the electron density during the beam extraction in the negative ion source.
Rev Sci Instrum
; 87(11): 11E105, 2016 Nov.
Article
em En
| MEDLINE
| ID: mdl-27910614
ABSTRACT
The upgraded millimeter-wave interferometer with the frequency of 70 GHz is installed on a large-scaled negative ion source. Measurable line-averaged electron density is from 2 × 1015 to 3 × 1018 m-3 in front of the plasma grid. Several improvements such as the change to shorter wavelength probing with low noise, the installation of special ordered horn antenna, the signal modulation for a high accuracy digital phase detection, the insertion of insulator, and so on, are carried out for the measurement during the beam extraction by applying high voltage. The line-averaged electron density is successfully measured and it is found that it increases linearly with the arc power and drops suddenly at the beam extraction.
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En
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2016
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Article