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File:Cockcroft-Walton 3MV Kaiser Wilhelm Institute 1937.png

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English: Control board and a voltage multiplier stack in the 3 megavolt Cockcroft-Walton particle accelerator at Kaiser Wilhelm Institute of Physics in Berlin in 1937. The source claims it was the world's most powerful accelerator at the time. It consisted of two 4 stage Cockcroft-Walton voltage multiplier stacks of opposite polarity, with the high potential appearing at the top of the stacks applied to electrodes at opposite ends of an evacuated accelerator tube. Subatomic particles are accelerated to high speeds in the tube by the high potential. A multiplier stack is visible behind the control desk. The black vertical segments are capacitors which store the charge, while the diagonal "rungs" between the columns are vacuum tube rectifiers called kenotrons, which only allow charge to pass in one direction. An alternating voltage of several hundred kilovolts is applied between the bottom of the columns, which act as a "charge pump" forcing charge into the top electrode. All exposed parts at high potential must have smooth gently curving surfaces to prevent corona discharge which causes leakage of current into the air. For safety, after setting the controls of the machine at the console shown, the operator left the room and operated the machine from another room, wearing dark glasses to protect their eyes from the brilliant arcs.
Date
Source Retrieved April 12, 2015 from "World's biggest atom smasher uses 3,000,000 volts" in Popular Science Monthly, Popular Science Publishing Co., New York, Vol. 131, No. 4, October 1937, p. 53 on Google Books
Author Unknown authorUnknown author
Permission
(Reusing this file)
This 1937 issue of Popular Science magazine would have the copyright renewed in 1965. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1964, 1965, and 1966 show no renewal entries for Popular Science. Therefore the copyright was not renewed and it is in the public domain.

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This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.

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current16:43, 2 May 2021Thumbnail for version as of 16:43, 2 May 2021364 × 716 (159 KB)Materialscientistcrop, FFT
06:07, 13 April 2015Thumbnail for version as of 06:07, 13 April 2015377 × 723 (243 KB)ChetvornoUser created page with UploadWizard

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