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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.”
G. W. Barnes, A. Janos, D. Loesser, D. K. Owens, M. Ulrickson
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 1761-1764
Impurity Control and Plasma-Facing Component | Proceedings of the Ninth Topical Meeting on the Technology of Fusion Energy (Oak Brook, Illinois, October 7-11, 1990) | doi.org/10.13182/FST91-A29597
Articles are hosted by Taylor and Francis Online.
The TFTR Bumper Limiter (BL)1,2 is a continuous toroidal belt limiter which subtends 120° poloidally on the inner wall of the vacuum vessel, is symmetric about the midplane of the vessel and has a total area of 22 m2. The plasma facing surface of the BL consists of graphite tiles mounted on water-cooled Inconel backing plates. During plasma operation with high power neutral beam injection (NBI), “carbon blooms”3 developed when surface temperatures at localized areas on the limiter exceeded 1700 C. The blooms severely limited plasma performance. During the February–April 1990 shutdown, 721 of the original POCO graphite tiles were replaced with 4D Carbon Fiber Composite (CFC)4 tiles to improve the performance of the Bumper Limiter. Another source of blooms was cutouts in the BL made for diagnostic access to the plasma. During the shutdown, the edge tiles at the cutouts were modified to reduce the power flux to levels insufficient to cause a bloom. This paper describes the tile replacement and modification program including material selection and the rationale for the tile replacement locations. The methods used to mechanically align the midplane of the limiter to ±0.5mm are addressed. Future plans to align the entire limiter to the toroidal magnetic field to similar accuracy using magnetic and mechanical measurements will also be discussed. The improvement in plasma performance due to the suppression of blooms due to these upgrades will be shown.