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Fusion Science and Technology
Hanford completes wastewater basin work to support tank waste treatment
Record-breaking heat and the vast size of the job did not stop the Department of Energy’s Office of River Protection and its tank operations contractor, Washington River Protection Solutions (WRPS), from completing a construction project critical to the Hanford Site’s Direct-Feed Low-Activity Waste program for treating radioactive tank waste.
L. Zang, T. Mizuuchi, N. Nishino, S. Ohshima, S. Yamamoto, Y. C. Sun, K. Kasajima, M. Takeuchi, K. Mukai, H. Y. Lee, N. Kenmochi, Y. Ohtani, K. Nagasaki, S. Kado, H. Okada, T. Minami, S. Kobayashi, N. Shi, S. Konoshima, Y. Nakamura, F. Sano
Fusion Science and Technology | Volume 68 | Number 4 | November 2015 | Pages 758-765
Technical Paper | dx.doi.org/10.13182/FST14-862
Articles are hosted by Taylor and Francis Online.
In the medium-sized heliotron device Heliotron J, edge density fluctuation has been measured simultaneously with a high-speed video camera and a Langmuir probe. Poloidally propagating, parallel elongating filamentary structures with 20- to 30-kHz frequency and ~14-cm poloidal wavelength were observed by a camera. However, the radial position of this density mode is not well known with only camera data because the camera lens axis is perpendicular to the torus plane. To identify the span of this density mode, plasma-surface interaction (PSI) between the probe and the plasma has been analyzed. As the probe scanned into the plasma, enhanced brightness due to PSI was clearly observed in camera images. By comparing this enhanced brightness among different probe positions, the outmost margin of the 20- to 30-kHz mode observed by the camera has been identified to be within 10 mm outside from the last closed flux surface. This conclusion is supported by the spectrum of the probe data.