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MEASUREMENTS AT HIGH FIELD STRENGTHS ON SUPERCONDUCTING ACCELERATOR CAVITIES,
STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB
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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 voltscm was produced. Also tested was a resonant section of disk-loaded accelerator structure three periods in length operating in the 2pi3 mode. In this cavity a maximum electric field of 150, 000 votscm 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 mRhr, was measured in the vicinity of the cavities. The radiation provides indirect evidence of strong accelerating fields. Author
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