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Fusion Science and Technology
Latest News
DOE issues RFQ for clean-energy projects at WIPP
The Department of Energy has issued a request for qualifications (RFQ) for interested parties that are looking to establish carbon pollution–free electricity (CFE) projects at its Waste Isolation Pilot Plant site in New Mexico.
T. Morisaki, M. Shoji, S. Masuzaki, S. Sakakibara, H. Yamada, A. Komori, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 465-470
Chapter 8. Diagnostics | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10832
Articles are hosted by Taylor and Francis Online.
Magnetic flux surface measurements have been carried out in the Large Helical Device (LHD) in the standard magnetic field configuration with toroidal magnetic field strength up to 2.75 T. An electron beam launched with a small electron gun moving across the flux surfaces was detected with a fluorescent screen or a probe array. Nested surfaces could clearly be visualized with both methods. Even the stochastic region was detected. In the experiment, unfavorable m/n = 1/1 and 2/1 magnetic islands were discovered near the last closed flux surface, where m and n are poloidal and toroidal mode numbers, respectively. There is a possibility that the source of the error field, in the low magnetic field of 0.0875 T, is terrestrial magnetism. On the other hand, in the standard magnetic field of 2.75 T, the main source of the error field is thought to be ferromagnetic materials near the torus of LHD. Fortunately, it was demonstrated that such magnetic islands can be reduced or eliminated by applying a correction field with some perturbation coils.