Large Helical Device
| Large Helical Device | |
|---|---|
Heliotron | |
| Location | Toki, Japan |
| Affiliation | National Institute for Fusion Science |
| Technical specifications | |
| Major radius | 3.9 m (13 ft) |
| Minor radius | 0.6 m (2 ft 0 in) |
| Magnetic field | 3.0 T (30,000 G) |
| History | |
| Year(s) of operation | 1998–present |
The Large Helical Device (大型ヘリカル装置, Ōgata Herikaru Sōchi) (LHD) is a fusion research device located in
heliotron magnetic field
originally developed in Japan.
The objective of the project is to conduct
electron cyclotron resonance heating (ECRH) to heat the plasma, much like conventional tokamaks. The helical divertor heat and particle exhaust system uses the large helical coils to produce a diverting field. This configuration allows for the modification of the stochastic layer size, which is positioned between the confined plasma volume and the field lines that terminate on the divertor plate. Boundary plasma research at LHD focuses on the capability of the helical divertor as an exhaust system for heliotrons and stellarators.[1][2]
History
- Design finalized 1987
- Start of construction 1990
- Plasma operations from 1998
- In 2006 a new helium cooler was added. Using the new cooler, by 2018 a total of 10 long term operations have been achieved, reaching a maximum power level of 11.833 kA.[5]
- To aid public acceptance, an exhaust system was designed to catch and filter the radioactive tritium the fusion process produces.[6]
![[icon]](/File:Wiki_letter_w_cropped.svg){kind=small} | This section needs expansion. You can help by adding to it. (March 2018) |
See also
- Fusion reactor
- National Institutes of Natural Sciences, Japan
References
- S2CID 122537627.
- ^ Bader, Aaron; Effenberg, Florian; Hegna, Chris C. (December 6, 2018). "Progress in Divertor and Edge Transport Research for Stellarator Plasmas" (PDF). Archived from the original (PDF) on 2023-07-26.
- S2CID 250824691.
Heating by NBI of 3 MW produced plasmas with a fusion triple product of 8 × 1018m−3 keV s at a magnetic field strength of 1.5 T. An electron temperature of 1.5 keV and an ion temperature of 1.1 keV were achieved simultaneously at a line averaged electron density of 1.5 × 1019 m−3
- ^ Achievement of One Hour Discharge with ECH on LHD 2005
- doi:10.1585/pfr.13.3405057.)
{{cite journal}}: CS1 maint: multiple names: authors list (link - ^ "Design and commissioning of the exhaust detritiation system for the Large Helical Device". ResearchGate. Retrieved 2019-03-04.
External links
- Large Helical Device Website Archived 2011-10-15 at the Wayback Machine good diagrams (worth archiving page)
- Super Dense Core plasmas in LHD. Harris. 2008 16 slides. advanced - inc ballooning mode and future development options
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