PAC2013 - List of Authors (Johnson, M.J.)

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.

THPBA13	Mechanical Design of the Cryogenic Sub-Systems for ReA6 Quarter Wave Resonator Cryomodule	1256
	M. Shuptar, F. Casagrande, A.D. Fox, M.J. Johnson, M. Leitner, S.J. Miller, T. Nellis, M.S. Patil, T. Xu, Y. Xu FRIB, East Lansing, Michigan, USA
	Funding: Work supported by US DOE Cooperative Agreement DE-SC000061 The driver linac for the Facility for Rare Isotope Beams (FRIB) consists of 49 cryomodules operated at 2 K utilizing 4 different types of superconducting resonators and 2 solenoid lengths which in turn requires 7 individual cryomodule configurations. The mechanical design requirements of the internal cryogenics of an FRIB cryomodule are determined by the piping and instrumentation diagram, which is discussed in the paper based on the FRIB quarter wave cryomodule type. In addition, heat load requirements and spatial constraints of other cryomodule sub-systems influence the cryomodule cryogenics design. The paper describes detailed design choices for the cryogenic headers and piping, a 2 K heat exchanger inside the cryomodule, solenoid current leads, and the bayonet connections to the cryogenic distribution system inside the accelerator tunnel. Different operating modes, which influence the cryogenic design, are summarized.

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.

TUPSM20	Integration Between the FRIB Linac Mechanical CAD Model Geometry and the Accelerator Physics Lattice Database	679
	M.J. Johnson NSCL, East Lansing, Michigan, USA N.K. Bultman, I. Grender, M. Leitner, G. Morgan, O. Yair, Q. Zhao FRIB, East Lansing, Michigan, USA
	Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661. This paper will summarize the systems engineering techniques utilized to translate the FRIB accelerator physics lattice file to actual three dimensional CAD geometry for linac components. An automated approach of using the accelerator physics lattice database used for optics and particle simulation has been implemented to generate data points used to position the technical 3-dimensional CAD geometry. This coordinated method ensures consistency between the technical and scientific design domains throughout the project design phases. The FRIB configuration management used to control lattice and CAD model revisions is also discussed. In addition, the paper discusses fiducialization plans and tolerance stack up analysis to meet positional requirements for FRIB cryomodules, diagnostics, and the beam delivery magnet systems.

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.

THPBA13

Mechanical Design of the Cryogenic Sub-Systems for ReA6 Quarter Wave Resonator Cryomodule

1256

M. Shuptar, F. Casagrande, A.D. Fox, M.J. Johnson, M. Leitner, S.J. Miller, T. Nellis, M.S. Patil, T. Xu, Y. Xu
FRIB, East Lansing, Michigan, USA

Funding: Work supported by US DOE Cooperative Agreement DE-SC000061
The driver linac for the Facility for Rare Isotope Beams (FRIB) consists of 49 cryomodules operated at 2 K utilizing 4 different types of superconducting resonators and 2 solenoid lengths which in turn requires 7 individual cryomodule configurations. The mechanical design requirements of the internal cryogenics of an FRIB cryomodule are determined by the piping and instrumentation diagram, which is discussed in the paper based on the FRIB quarter wave cryomodule type. In addition, heat load requirements and spatial constraints of other cryomodule sub-systems influence the cryomodule cryogenics design. The paper describes detailed design choices for the cryogenic headers and piping, a 2 K heat exchanger inside the cryomodule, solenoid current leads, and the bayonet connections to the cryogenic distribution system inside the accelerator tunnel. Different operating modes, which influence the cryogenic design, are summarized.

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.

TUPSM20

Integration Between the FRIB Linac Mechanical CAD Model Geometry and the Accelerator Physics Lattice Database

679

M.J. Johnson
NSCL, East Lansing, Michigan, USA
N.K. Bultman, I. Grender, M. Leitner, G. Morgan, O. Yair, Q. Zhao
FRIB, East Lansing, Michigan, USA

Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661.
This paper will summarize the systems engineering techniques utilized to translate the FRIB accelerator physics lattice file to actual three dimensional CAD geometry for linac components. An automated approach of using the accelerator physics lattice database used for optics and particle simulation has been implemented to generate data points used to position the technical 3-dimensional CAD geometry. This coordinated method ensures consistency between the technical and scientific design domains throughout the project design phases. The FRIB configuration management used to control lattice and CAD model revisions is also discussed. In addition, the paper discusses fiducialization plans and tolerance stack up analysis to meet positional requirements for FRIB cryomodules, diagnostics, and the beam delivery magnet systems.