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Kathryn Huff stepping down from DOE Nuclear Energy post
Huff
After serving two years as the Department of Energy’s assistant secretary for Nuclear Energy, Kathryn Huff will vacate that position on May 3 and return to teaching. Huff had started at the DOE in May 2021, serving for one year as the principal deputy assistant secretary for Nuclear Energy
“Serving in this capacity has been an unparalleled privilege, and I’m immensely grateful for the opportunity to have worked alongside you--the dedicated and talented public servants in Nuclear Energy, in DOE, and across the Biden-Harris Administration,” Huff wrote in an email announcement to colleagues last week. “I chose this timing to enable the smoothest transition back to my professorship at the University of Illinois at Urbana-Champaign where my beloved research, students, husband, and dog await.”
A. V. Melnikov, A. Alonso, E. Ascasíbar, R. Balbin, A. A. Chmyga, Yu. N. Dnestrovskij, L. G. Eliseev, T. Estrada, J. M. Fontdecaba, C. Fuentes, J. Guasp, J. Herranz, C. Hidalgo, A. D. Komarov, A. S. Kozachek, L. I. Krupnik, M. Liniers, S. E. Lysenko, K. J. McCarthy, M. A. Ochando, I. Pastor, J. L. De Pablos, M. A. Pedrosa, S. V. Perfilov, S. Ya. Petrov, V. I. Tereshin, TJ-II Team
Fusion Science and Technology | Volume 51 | Number 1 | January 2007 | Pages 31-37
Technical Paper | Stellarators | doi.org/10.13182/FST07-A1284
Articles are hosted by Taylor and Francis Online.
The heavy ion beam probe diagnostic is used in the TJ-II stellarator to study directly the plasma electric potential with good spatial (up to 1 cm) and temporal (up to 2 s) resolution. Singly charged heavy ions, Cs+, with energies of up to 125 keV are used to probe the plasma column from the edge to the core. Both electron cyclotron resonance heating (ECRH) and neutral beam injection (NBI)-heated plasmas (PECRH = 200 to 400 kW, PNBI = 200 to 400 kW, ENBI = 28 keV) have been studied.Low-density ECRH [[over bar]n = (0.5 to 1.1) × 1019 m-3] plasmas in TJ-II are characterized by positive plasma potential on the order of 1000 to 400 V. A negative electric potential appears at the edge when the line-averaged density exceeds 0.5 × 1019 m-3. Further density rises are accompanied by a decrease in the core plasma potential, which becomes fully negative for plasma densities [over bar]n 1.5 × 1019 m-3. The NBI plasmas are characterized by a negative electric potential across the whole plasma cross section from the core to the edge. In this case, the absolute value of the central potential is on the order of -500 V. These results show a clear link between plasma potential and density in the TJ-II stellarator.
