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Superconducting accelerator cavity with a heat affected zone having a higher RRR

United States Patent

August 1, 2000
View the Complete Patent at the US Patent & Trademark Office
Thomas Jefferson National Accelerator Facility - Visit the Technology Review Committee Website
An improved method for welding accelerator cavities without the need for time consuming and expensive faying surface treatments comprising electron beam welding such cavities in a vacuum welding chamber within a vacuum envelope and using the following welding parameters: a beam voltage of between about 45 KV and 55 KV; a beam current between about 38 ma and 47 ma; a weld speed of about 15 cm/min; and a sharp focus and a rhombic raster of between about 9 KHz and 10 Khz. A welded cavity made according to the method of the present invention is also described.
Brawley; John (Grafton, VA), Phillips; H. Lawrence (Hayes, VA)
Southeastern Universities Research Assn. (
09/ 183,937
November 2, 1998
The United States of America may have certain rights to this invention under Management and Operating Contract DE-AC05-84ER40150 from the United States Department of Energy.