SRF2011 - List of Authors (Fischer, R.L.)

Paper	Title	Page
MOPO026	β = 0.285 Half-Wave Resonator for FRIB	132
	P.N. Ostroumov, Z.A. Conway, R.L. Fischer, S.M. Gerbick, M.P. Kelly, A. Kolomiets, B. Mustapha, A. Ortega Bergado ANL, Argonne, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357and WFO 85Y64 Supported by Michigan State University We have developed an optimized electromagnetic and mechanical design of a 322 MHz half-wave resonator (HWR) suitable for acceleration of ions in the post-stripper section of the Facility for Rare Isotope Beams (FRIB). The cavity design is based on recent advances in SRF technology for TEM-class structures being developed at ANL. Highly optimized EM parameters were achieved using an ”hourglass” cavity shape for the HWR. This new design will be processed with a new HWR horizontal electropolishing system after all mechanical work on the cavity including the welding of the helium vessel is complete. Recently, this procedure was successfully tested on a quarter wave resonator developed for the ATLAS Upgrade which achieved peak surface fields of 70 MV/m and 10⁵ mT. Following these results we propose to operate the HWR with a 2.6 MV accelerating voltage per cavity at the optimal ion velocity of β = 0.285. Fabrication of the cavity can be started immediately as soon as funding is available.

Paper

Title

Page

β = 0.285 Half-Wave Resonator for FRIB

132

P.N. Ostroumov, Z.A. Conway, R.L. Fischer, S.M. Gerbick, M.P. Kelly, A. Kolomiets, B. Mustapha, A. Ortega Bergado
ANL, Argonne, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357and WFO 85Y64 Supported by Michigan State University
We have developed an optimized electromagnetic and mechanical design of a 322 MHz half-wave resonator (HWR) suitable for acceleration of ions in the post-stripper section of the Facility for Rare Isotope Beams (FRIB). The cavity design is based on recent advances in SRF technology for TEM-class structures being developed at ANL. Highly optimized EM parameters were achieved using an ”hourglass” cavity shape for the HWR. This new design will be processed with a new HWR horizontal electropolishing system after all mechanical work on the cavity including the welding of the helium vessel is complete. Recently, this procedure was successfully tested on a quarter wave resonator developed for the ATLAS Upgrade which achieved peak surface fields of 70 MV/m and 10⁵ mT. Following these results we propose to operate the HWR with a 2.6 MV accelerating voltage per cavity at the optimal ion velocity of β = 0.285. Fabrication of the cavity can be started immediately as soon as funding is available.