IPAC2012 - List of Authors (Lopes, M.L.)

Paper	Title	Page
TUPPD010	Helical Muon Beam Cooling Channel Engineering Design	1425
	G. Flanagan, R.P. Johnson, G.M. Kazakevich, F. Marhauser, M.L. Neubauer Muons, Inc, Batavia, USA V.S. Kashikhin, M.L. Lopes, G.V. Romanov, M.A. Tartaglia, K. Yonehara, M. Yu, A.V. Zlobin Fermilab, Batavia, USA
	Funding: Supported in part by 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 present the progress toward a conceptual design for the integration of 805 MHz RF cavities into a 10 T Nb3Sn based HCC test section. We include discussions on the pressure and thermal barriers needed within the cryostat to maintain operation of the magnet at 4.2 K while operating the RF and energy absorber at a higher temperature. Additionally, we include progress on the Nb3Sn helical solenoid design

THPPD020	Test of a 1.8 Tesla, 400 Hz Dipole for a Muon Synchrotron	3542
	D.J. Summers, L.M. Cremaldi, T.L. Hart, L.P. Perera, M. Reep UMiss, University, Mississippi, USA S.U. Hansen, M.L. Lopes Fermilab, Batavia, USA J. Reidy Oxford High School, Mississippi, USA H. Witte BNL, Upton, Long Island, New York, USA
	Funding: Supported by DE-FG05-91ER40622. A 1.8 Tesla dipole magnet using 0.011" AK Steel TRAN-COR H-1 grain oriented silicon steel laminations has been constructed as a prototype for a muon synchrotron ramping at 400 Hz. Following the practice in large 3 phase transformers and our own OPERA-2D simulations, joints are mitered to take advantage of the magnetic properties of the steel which are most effective in the direction in which the steel was rolled. Measurements with a Hysteresigraph 5500 and Epstein Frame show a high magnetic permeability which minimizes stored energy in the yoke so the magnet can ramp quickly with modest voltage. A power supply with a fast IGBT switch and a polypropylene capacitor was constructed. Coils are wound with 12 gauge copper wire which will eventually be cooled with with water flowing in stainless steel tubes. The magnetic field was measured with an F. W. Bell 5180 peak sensing Hall Probe connected to a Tektronics TDS3054B oscilloscope.

THPPD037	Design Studies of a Dipole with Elliptical Aperture for the Muon Collider Storage Ring	3590
	M.L. Lopes, V. Kashikhin, J.C. Tompkins, A.V. Zlobin Fermilab, Batavia, USA R.B. Palmer BNL, Upton, Long Island, New York, USA
	Funding: Work supported partially by US-MAP and by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy The requirements and operating conditions for superconducting magnets used in a Muon Collider Storage Ring are challenging. About one third of the beam energy is deposited along the magnets by the decay electrons. As a possible solution an elliptical tungsten absorber could intercept the decay electrons and absorb the heat limiting the heat load on superconducting coils to the acceptable level. In this paper we describe the main design issues of dipoles with an elliptical aperture taking into consideration the field and field quality. The temperature margin and the forces in the coils are presented as well.

Paper

Title

Page

Helical Muon Beam Cooling Channel Engineering Design

1425

G. Flanagan, R.P. Johnson, G.M. Kazakevich, F. Marhauser, M.L. Neubauer
Muons, Inc, Batavia, USA
V.S. Kashikhin, M.L. Lopes, G.V. Romanov, M.A. Tartaglia, K. Yonehara, M. Yu, A.V. Zlobin
Fermilab, Batavia, USA

Funding: Supported in part by 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 present the progress toward a conceptual design for the integration of 805 MHz RF cavities into a 10 T Nb3Sn based HCC test section. We include discussions on the pressure and thermal barriers needed within the cryostat to maintain operation of the magnet at 4.2 K while operating the RF and energy absorber at a higher temperature. Additionally, we include progress on the Nb3Sn helical solenoid design

THPPD020

Test of a 1.8 Tesla, 400 Hz Dipole for a Muon Synchrotron

3542

D.J. Summers, L.M. Cremaldi, T.L. Hart, L.P. Perera, M. Reep
UMiss, University, Mississippi, USA
S.U. Hansen, M.L. Lopes
Fermilab, Batavia, USA
J. Reidy
Oxford High School, Mississippi, USA
H. Witte
BNL, Upton, Long Island, New York, USA

Funding: Supported by DE-FG05-91ER40622.
A 1.8 Tesla dipole magnet using 0.011" AK Steel TRAN-COR H-1 grain oriented silicon steel laminations has been constructed as a prototype for a muon synchrotron ramping at 400 Hz. Following the practice in large 3 phase transformers and our own OPERA-2D simulations, joints are mitered to take advantage of the magnetic properties of the steel which are most effective in the direction in which the steel was rolled. Measurements with a Hysteresigraph 5500 and Epstein Frame show a high magnetic permeability which minimizes stored energy in the yoke so the magnet can ramp quickly with modest voltage. A power supply with a fast IGBT switch and a polypropylene capacitor was constructed. Coils are wound with 12 gauge copper wire which will eventually be cooled with with water flowing in stainless steel tubes. The magnetic field was measured with an F. W. Bell 5180 peak sensing Hall Probe connected to a Tektronics TDS3054B oscilloscope.

THPPD037

Design Studies of a Dipole with Elliptical Aperture for the Muon Collider Storage Ring

3590

M.L. Lopes, V. Kashikhin, J.C. Tompkins, A.V. Zlobin
Fermilab, Batavia, USA
R.B. Palmer
BNL, Upton, Long Island, New York, USA

Funding: Work supported partially by US-MAP and by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
The requirements and operating conditions for superconducting magnets used in a Muon Collider Storage Ring are challenging. About one third of the beam energy is deposited along the magnets by the decay electrons. As a possible solution an elliptical tungsten absorber could intercept the decay electrons and absorb the heat limiting the heat load on superconducting coils to the acceptable level. In this paper we describe the main design issues of dipoles with an elliptical aperture taking into consideration the field and field quality. The temperature margin and the forces in the coils are presented as well.