Document Type

Conference Paper

Publication Date


Publication Title

IPAC 2012: Proceedings of the International Particle Accelerator Conference 2012



Conference Name

International Particle Accelerator Conference 2012, May 20-25, 2012, New Orleans, Louisiana


CEBAF at JLab is in the process of an energy upgrade from 6 GeV to 12 GeV. The existing setup of the RF separator cavities in the 5th pass will not be adequate enough to extract the highest energy (11 GeV) beam to any two existing halls (A, B or C) while simultaneously delivering to the new hall D in the case of the proposed 12 GeV upgrade of the machine. To restore this capability, several options including the extension of existing normal conducting (NC) and a potential 499 MHz TEM-type superconducting (SC) cavity design have been investigated using computer simulations. Detailed numerical studies suggest that six 2-cell normal conducting structures meet the requirements; each 2-cell structure will require up to 4 kW RF input power in contrast with the current nominal operating power of 1.0 to 2.0 kW. A high power test to 4 kW is required to confirm the cavity’s operate-ability at these elevated gradient and power levels. We have assembled a 2-cell cavity, pumped down to 2.0·10-9 torr using ion pump and confirmed the low level RF performance. A high power test is in progress and will be completed soon. The detailed numerical and experimental results will be discussed in the paper.


© 2012 by IPAC'12/IEEE.

Published under a Creative Commons Attribution 3.0 Unported (CC BY 3.0) license.

Original Publication Citation

Ahmed, S., Wissmann, M., Mammosser, J., Spata, M., Hovater, C., Krafft, G., & Delayen, J. R. (2012). High power test of RF separator for 12 GEV upgrade of CEBAF at Jefferson Lab. In IPAC 2012: Proceedings of the International Particle Accelerator Conference 2012 (pp. 4032-4034). JACoW.


0000-0002-0328-5828 (Krafft)