PAC2013 - List of Authors (Saito, K.)

Paper	Title	Page
WEPAC20	Magnetic Shield Optimization for the FRIB Superconducting Quarter-Wave Resonator Cryomodule	829
	Y. Xu, A.D. Fox, M.J. Johnson, M. Leitner, S.J. Miller, K. Saito FRIB, East Lansing, Michigan, USA
	The Facility for Rare Isotope Beams (FRIB) requires 49 cryomodules containing 330 superconducting low-beta cavities, which have to be shielded from the earth magnetic field. Comprehensive magnetic shielding simulations have been conducted for 80.5 MHz β=0.085 cryomodules exposed to earth fields of 0.5 Gauss in different coordinate directions. The magnetic shield has to attenuate the earth magnetic field by a minimum factor of 33 (to less than 15 milli Gauss) in order to limit flux trapping in the cavities during cool-down. In the reported optimization studies, the permeability of the magnetic shielding material, shield thickness, and number of magnetic shield layers have been varied. Different design concepts including global and local magnetic shielding have been evaluated. In addition, the design concepts are compared based on the cost of material, fabrication and assembly, the design complexity and compatibility with the overall cryomodule design to obtain an optimum solution.

FRYBA1	Progress towards the Facility for Rare Isotope Beams	1453
	J. Wei, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, J. DeKamp, B. Drewyor, K. Elliott, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leitner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.A. Nolen, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev, T. Russo, K. Saito, J.J. Savino, R.C. Webber, M. Williams, T. Xu, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao FRIB, East Lansing, USA D. Arenius, V. Ganni JLAB, Newport News, Virginia, USA A. Facco INFN/LNL, Legnaro (PD), Italy R.E. Laxdal TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada J.A. Nolen ANL, Argonne, USA
	Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661 The Facility for Rare Isotope Beams (FRIB) is based on a continuous-wave superconducting heavy ion linac to accelerate all the stable isotopes to above 200 MeV/u with a beam power of up to 400 kW. At an average beam power approximately two-to-three orders-of-magnitude higher than those of operating heavy-ion facilities, FRIB stands at the power frontier of the accelerator family - the first time for heavy-ion accelerators. To realize this innovative performance, superconducting RF cavities are used starting at the very low energy of 500 keV/u, and beams with multiple charge states are accelerated simultaneously. Many technological challenges specific for this linac have been tackled by the FRIB team and collaborators. Furthermore, the distinct differences from the other types of linacs at the power front must be clearly understood to make the FRIB successful. This report summarizes the technical progress made in the past years to meet these challenges.

Paper

Title

Page

Magnetic Shield Optimization for the FRIB Superconducting Quarter-Wave Resonator Cryomodule

829

Y. Xu, A.D. Fox, M.J. Johnson, M. Leitner, S.J. Miller, K. Saito
FRIB, East Lansing, Michigan, USA

The Facility for Rare Isotope Beams (FRIB) requires 49 cryomodules containing 330 superconducting low-beta cavities, which have to be shielded from the earth magnetic field. Comprehensive magnetic shielding simulations have been conducted for 80.5 MHz β=0.085 cryomodules exposed to earth fields of 0.5 Gauss in different coordinate directions. The magnetic shield has to attenuate the earth magnetic field by a minimum factor of 33 (to less than 15 milli Gauss) in order to limit flux trapping in the cavities during cool-down. In the reported optimization studies, the permeability of the magnetic shielding material, shield thickness, and number of magnetic shield layers have been varied. Different design concepts including global and local magnetic shielding have been evaluated. In addition, the design concepts are compared based on the cost of material, fabrication and assembly, the design complexity and compatibility with the overall cryomodule design to obtain an optimum solution.

FRYBA1

Progress towards the Facility for Rare Isotope Beams

1453

J. Wei, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, J. DeKamp, B. Drewyor, K. Elliott, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leitner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.A. Nolen, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev, T. Russo, K. Saito, J.J. Savino, R.C. Webber, M. Williams, T. Xu, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao
FRIB, East Lansing, USA
D. Arenius, V. Ganni
JLAB, Newport News, Virginia, USA
A. Facco
INFN/LNL, Legnaro (PD), Italy
R.E. Laxdal
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
J.A. Nolen
ANL, Argonne, USA

Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB) is based on a continuous-wave superconducting heavy ion linac to accelerate all the stable isotopes to above 200 MeV/u with a beam power of up to 400 kW. At an average beam power approximately two-to-three orders-of-magnitude higher than those of operating heavy-ion facilities, FRIB stands at the power frontier of the accelerator family - the first time for heavy-ion accelerators. To realize this innovative performance, superconducting RF cavities are used starting at the very low energy of 500 keV/u, and beams with multiple charge states are accelerated simultaneously. Many technological challenges specific for this linac have been tackled by the FRIB team and collaborators. Furthermore, the distinct differences from the other types of linacs at the power front must be clearly understood to make the FRIB successful. This report summarizes the technical progress made in the past years to meet these challenges.