Preparation and Commissioning for the LHD Deuterium Experiment

The deuterium experiment started from March 2017 on the large helical device (LHD) as a part of the LHD high-performance upgrade project. The objectives of the deuterium experiment are: 1) to realize the high-performance operation; 2) to explore the physics of isotope effect; 3) to demonstrate the c...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2018-06, Vol.46 (6), p.2324-2331
Main Authors: Osakabe, Masaki, Isobe, Mitsutaka, Tanaka, Masahiro, Motojima, Gen, Tsumori, Katsuyoshi, Yokoyama, Masayuki, Morisaki, Tomohiro, Takeiri, Yasuhiko
Format: Article
Language:English
Subjects:
Deuterium
Deuterium experiment
fuel mass balance
heliotron
isotope effect
Isotopes
large helical device (LHD)
negative-ion source
neutron diagnostic
Neutrons
Particle beam injection
Particle beams
Plasmas
steady-state operation
stellarator
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Summary:The deuterium experiment started from March 2017 on the large helical device (LHD) as a part of the LHD high-performance upgrade project. The objectives of the deuterium experiment are: 1) to realize the high-performance operation; 2) to explore the physics of isotope effect; 3) to demonstrate the confinement capability of energetic particles in helical devices; and 4) to explore the research on plasma-material interactions using the benefit of stable steady-state operation ability of LHD. As preparations for deuterium experiment, the positive-ion-based neutral beam injectors (NBIs) are upgraded to increase their injection power in deuterium operation. On the other hand, the injection power of negative-ion-based NBI is deteriorated due to the isotope effect of negative-ion source. The neutron diagnostic and the exhaust detritiation system are newly installed for the deuterium experiment. The commissioning of LHD for the deuterium experiment is quite successful. The high ion temperature operation region is extended by the deuterium experiment. Ion temperature exceeding 9 keV is achieved with the deuterium operation of LHD.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2018.2825423