PAC2013 - List of Authors (Kahn, S.A.)

Paper	Title	Page
THPBA22	Helical Muon Beam Cooling Channel Engineering Design	1274
	G. Flanagan, R.P. Johnson, S.A. Kahn, M.L. Neubauer Muons, Inc, Illinois, USA N. Andreev, R. Bossert, S. Krave, M.L. Lopes, J.C. Tompkins, K. Yonehara Fermilab, Batavia, USA F. Marhauser MuPlus, Inc., Newport News, USA
	Funding: DOE STTR Grant DE-SC0006266 The Helical Cooling Channel (HCC), a novel technique for six-dimensional (6D) ionization cooling of muon beams, has shown considerable promise based on analytic and simulation studies. However, the implementation of this revolutionary method of muon cooling requires new techniques for the integration of hydrogen-pressurized, high-power RF cavities into the low-temperature superconducting magnets of the HCC. We discuss progress and plans toward the critical path technology demonstrations of dielectric loaded 805 MHz RF cavities and 10 T Nb3Sn based Helical Solenoid magnet. Additionally we discuss integration challenges.

THPBA24	A Dipole Magnet for the FRIB High Radiation Environment Nuclear Fragment Separator	1280
	S.A. Kahn, A. Dudas, G. Flanagan, J.H. Nipper Muons, Inc, Illinois, USA M. Anerella, R.C. Gupta, J. Schmalzle BNL, Upton, Long Island, New York, USA
	Funding: U.S. DOE grants DE-SC-0006273 and DE-AC02-98CH10886 Magnets in the fragment separator region of the Facility for Rare Isotope Beams (FRIB) would be subjected to extremely high radiation and heat loads. Critical elements of FRIB are the dipole magnets which select the desired isotopes. Since conventional NiTi and Nb3Sn superconductors must operate at ~4.5 K, the removal of the high heat load generated in these magnets with these superconductors would be difficult. The coils for these magnets must accommodate the large curvature from the 30° bend that the magnets subtend. High temperature superconductors (HTS) have been shown to be radiation resistant and can operate in the 40 K temperature range where heat removal is an order of magnitude more efficient than at 4.5 K. This paper will describe the magnetic and preliminary engineering design of these magnets.

THPBA25	Radiation Tolerant Multipole Correction Coils for FRIB Quadrupoles	1283
	S.A. Kahn Muons, Inc, Illinois, USA R.C. Gupta BNL, Upton, Long Island, New York, USA
	Multipole correction insert coils with significant field strength are required inside the large aperture superconducting quadrupole magnets in the fragment separator section of the Facility for Rare Isotope Beams (FRIB). Correction coils made with copper do not create the required field and conventional low temperature superconductors are not practical in the fragment separator magnets which will operate at 40 K. The correction coils should be made of HTS as the main quadrupole coils are. There is a significant advantage to using HTS in these coils as it can withstand the high radiation and heat load that will be present. This paper will describe an innovative design suitable for coils with the complex end geometry of cylindrical coils. We will look at the forces on the corrector coils from the main quadrupole fields and anticipate possible coil distortions.

THPBA26	Elliptical Muon Helical Cooling Channel Coils	1286
	S.A. Kahn, G. Flanagan Muons, Inc, Illinois, USA M.L. Lopes, K. Yonehara Fermilab, Batavia, USA
	Funding: U.S. DOE Grant Number DE-SC0006266 A helical cooling channel (HCC) consisting of a pressurized gas absorber imbedded in a magnetic channel that provides solenoid, helical dipole and helical quadrupole fields has shown considerable promise in providing six-dimensional phase space reduction for muon beams. The most effective approach to implementing the desired magnetic field is a helical solenoid (HS) channel composed of short solenoid coils arranged in a helical pattern. The HS channel along with an external solenoid allows the Bz and Bphi components along the reference orbit to be set to any desired values. To set dBphi/dr to the desired value for optimum focusing requires an additional variable. We shall show that using elliptical shaped coils in the HS channel allows the flexibility to achieve the desired dBphi/dr on orbit without significant change to Bz and Bphi.

Paper

Title

Page

Helical Muon Beam Cooling Channel Engineering Design

1274

G. Flanagan, R.P. Johnson, S.A. Kahn, M.L. Neubauer
Muons, Inc, Illinois, USA
N. Andreev, R. Bossert, S. Krave, M.L. Lopes, J.C. Tompkins, K. Yonehara
Fermilab, Batavia, USA
F. Marhauser
MuPlus, Inc., Newport News, USA

Funding: DOE STTR Grant DE-SC0006266
The Helical Cooling Channel (HCC), a novel technique for six-dimensional (6D) ionization cooling of muon beams, has shown considerable promise based on analytic and simulation studies. However, the implementation of this revolutionary method of muon cooling requires new techniques for the integration of hydrogen-pressurized, high-power RF cavities into the low-temperature superconducting magnets of the HCC. We discuss progress and plans toward the critical path technology demonstrations of dielectric loaded 805 MHz RF cavities and 10 T Nb3Sn based Helical Solenoid magnet. Additionally we discuss integration challenges.

THPBA24

A Dipole Magnet for the FRIB High Radiation Environment Nuclear Fragment Separator

1280

S.A. Kahn, A. Dudas, G. Flanagan, J.H. Nipper
Muons, Inc, Illinois, USA
M. Anerella, R.C. Gupta, J. Schmalzle
BNL, Upton, Long Island, New York, USA

Funding: U.S. DOE grants DE-SC-0006273 and DE-AC02-98CH10886
Magnets in the fragment separator region of the Facility for Rare Isotope Beams (FRIB) would be subjected to extremely high radiation and heat loads. Critical elements of FRIB are the dipole magnets which select the desired isotopes. Since conventional NiTi and Nb3Sn superconductors must operate at ~4.5 K, the removal of the high heat load generated in these magnets with these superconductors would be difficult. The coils for these magnets must accommodate the large curvature from the 30° bend that the magnets subtend. High temperature superconductors (HTS) have been shown to be radiation resistant and can operate in the 40 K temperature range where heat removal is an order of magnitude more efficient than at 4.5 K. This paper will describe the magnetic and preliminary engineering design of these magnets.

THPBA25

Radiation Tolerant Multipole Correction Coils for FRIB Quadrupoles

1283

S.A. Kahn
Muons, Inc, Illinois, USA
R.C. Gupta
BNL, Upton, Long Island, New York, USA

Multipole correction insert coils with significant field strength are required inside the large aperture superconducting quadrupole magnets in the fragment separator section of the Facility for Rare Isotope Beams (FRIB). Correction coils made with copper do not create the required field and conventional low temperature superconductors are not practical in the fragment separator magnets which will operate at 40 K. The correction coils should be made of HTS as the main quadrupole coils are. There is a significant advantage to using HTS in these coils as it can withstand the high radiation and heat load that will be present. This paper will describe an innovative design suitable for coils with the complex end geometry of cylindrical coils. We will look at the forces on the corrector coils from the main quadrupole fields and anticipate possible coil distortions.

THPBA26

Elliptical Muon Helical Cooling Channel Coils

1286

S.A. Kahn, G. Flanagan
Muons, Inc, Illinois, USA
M.L. Lopes, K. Yonehara
Fermilab, Batavia, USA

Funding: U.S. DOE Grant Number DE-SC0006266
A helical cooling channel (HCC) consisting of a pressurized gas absorber imbedded in a magnetic channel that provides solenoid, helical dipole and helical quadrupole fields has shown considerable promise in providing six-dimensional phase space reduction for muon beams. The most effective approach to implementing the desired magnetic field is a helical solenoid (HS) channel composed of short solenoid coils arranged in a helical pattern. The HS channel along with an external solenoid allows the Bz and Bphi components along the reference orbit to be set to any desired values. To set dBphi/dr to the desired value for optimum focusing requires an additional variable. We shall show that using elliptical shaped coils in the HS channel allows the flexibility to achieve the desired dBphi/dr on orbit without significant change to Bz and Bphi.