A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Li, D.

Paper Title Page
THP066 Breakdown in Pressurized RF Cavities 945
  • R. Sah, M. Alsharo'a, R.P. Johnson, M.L. Neubauer
    Muons, Inc, Batavia
  • M. BastaniNejad, A.A. Elmustafa
    Old Dominion University, Norfolk, Virginia
  • J.M. Byrd, D. Li
    LBNL, Berkeley, California
  • D. Rose, C.H. Thoma, D.R. Welch
    Voss Scientific, Albuquerque, New Mexico
  • G.M. Wang
    ODU, Norfolk, Virginia

The performance of many particle accelerators is limited by the maximum electric gradient that can be realized in rf cavities. Recent studies have shown that high gradients can be achieved quickly in 805 MHz cavities pressurized with dense hydrogen gas, because the gas can suppress, or essentially eliminate, dark currents and multipacting. In this project, two new test cells operating at 500 MHz and 1.3 GHz will be built and tested, and the high pressure technique will be used to suppress the vacuum effects of evacuated rf cavities, so that the role of metallic surfaces in rf cavity breakdown can be isolated and studied as a function of external magnetic field, frequency, and surface preparation. Previous studies have indicated that the breakdown probability is proportional to a high power of the surface electromagnetic field, in accordance with the Fowler-Nordheim description of electron emission from a cold cathode. The experiments will be compared with computer simulations of the rf breakdown process.