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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.”
J. G. Murray/K. E. Rothe, George Bronner
Fusion Science and Technology | Volume 4 | Number 2 | September 1983 | Pages 1486-1490
Power Conversion, Instrumentation, and Control | doi.org/10.13182/FST83-A23066
Articles are hosted by Taylor and Francis Online.
The energy loss in a torus vessel during startup is now an important factor in a power-producing tokamak design. The torus design cannot be based on a system which minimizes the conductivity with resistive structures as in present experimental devices. If the resistivity of the torus is too high, the reactors are subject to damage from an uncontrolled fast shutdown such as a disruption. The thermal and magnetic stored energy due to the plasma current loop is several hundred megajoules, which can produce melting of the torus wall. To prevent excessive damage, a low resistance passive circuit must be provided close to the plasma edge. Another desirable design feature is to make all vacuum seals as far away from the plasma as practical. Thus, the reactor torus designs need an inner low resistance shell and an outer high resistance shell. In addition, the superconducting dewar and coil support structures provide paths for toroidal currents to flow. The calculations provided in this paper can be used to determine the size and cost of the systems as a function of the resistances of the structures. The results can thus be used to guide the preliminary concepts for the electromagnetic characteristics of a tokamak.