Accession Number : AD0623509

Title :   MEASUREMENTS AT HIGH FIELD STRENGTHS ON SUPERCONDUCTING ACCELERATOR CAVITIES,

Corporate Author : STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB

Personal Author(s) : Schwettman,H. A. ; Wilson,P. B. ; Churilov,G. Y.

Report Date : JUN 1965

Pagination or Media Count : 11

Abstract : High electric field strengths were produced in two superconducting rf cavities with electroplated lead surfaces. The cavities operate near 2856 MHz in modes which are useful for particle acceleration. In a cylindrical cavity operating in the TM010 mode a Q of 2.5 x 10 to the 8th power was obtained at 2K. At a power input into the cavity of 2.5 watts a maximum electric field strength on the axis of about 100,000 volts/cm was produced. Also tested was a resonant section of disk-loaded accelerator structure three periods in length operating in the 2pi/3 mode. In this cavity a maximum electric field of 150, 000 vots/cm was obtained. In both cavities the electric field strength appeared to be limited by electron loading due to field emission. Radiation, which at times exceeded 100 mR/hr, was measured in the vicinity of the cavities. The radiation provides indirect evidence of strong accelerating fields. (Author)

Descriptors :   (*PARTICLE ACCELERATORS, CAVITY RESONATORS), (*CAVITY RESONATORS, SUPERCONDUCTORS), (*SUPERCONDUCTORS, PARTICLE ACCELERATORS), ELECTRIC FIELDS, CRYOGENICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE