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Fusion Science and Technology
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General Kenneth Nichols and the Manhattan Project
Nichols
The Oak Ridger has published the latest in a series of articles about General Kenneth D. Nichols, the Manhattan Project, and the 1954 Atomic Energy Act. The series has been produced by Nichols’ grandniece Barbara Rogers Scollin and Oak Ridge (Tenn.) city historian David Ray Smith. Gen. Nichols (1907–2000) was the district engineer for the Manhattan Engineer District during the Manhattan Project.
As Smith and Scollin explain, Nichols “had supervision of the research and development connected with, and the design, construction, and operation of, all plants required to produce plutonium-239 and uranium-235, including the construction of the towns of Oak Ridge, Tennessee, and Richland, Washington. The responsibility of his position was massive as he oversaw a workforce of both military and civilian personnel of approximately 125,000; his Oak Ridge office became the center of the wartime atomic energy’s activities.”
M. Inutake, S. Furukawa, S. Tanaka, R. Katsumata, A. Ishihara, M. Ichimura, A. Kumagai, K. Hattori, H. Hojo, A. Mase, Y. Nakashima, Y. Nagayama, M. Shoji, N. Yamaguchi, I. Katanuma, D.D. Ryutov, T. Tamano
Fusion Science and Technology | Volume 27 | Number 3 | April 1995 | Pages 409-412
Mirror Device Studies | doi.org/10.13182/FST95-A11947117
Articles are hosted by Taylor and Francis Online.
Magnetohydrodynamic (MHD) stability of the GAMMA 10 tandem mirror is extensively studied in ICRF-heated, hot ion plasmas. Stability boundary for a flute interchange mode is predicted to depend on a pressure-weighted curvature integrated along the magnetic field line. It is found that upper limit of the central-cell beta βC increases linearly with the anchor-cell beta βA. The critical beta ratio βC/βA above which the plasma cannot be sustained strongly depends on the pressure anisotropy P⊥/P|| of hot ions. Stronger anisotropy greatly expands the stable region up to a higher critical beta ratio, owing to the reduction of the pressure weighting in the bad curvature region of the central cell. On both sides of the quadrupole anchor cells, there are flux-tube-recircularizing transition regions where the normal curvature is highly bad. Then the density and ion temperature of the cold plasma in the transition region are measured. Theoretical prediction on the flute stability boundary calculated by using the measured axial pressure profile of the hot-ion and the cold-plasma pressure can explain well the experimental results.