2011 Particle Accelerator Conference - List of Authors (Fernow, R.C.)

Paper

Title

Page

Charge Separation for Muon Collider Cooling

103

R. B. Palmer, R.C. Fernow
BNL, Upton, Long Island, New York, USA

Most schemes for six dimensional muon ionization cooling work for only one sign. It is then necessary to have charge separation prior to that cooling. Schemes of charge separation using bent solenoids are described, and their simulated performances reported. It is found that for efficient separation, it should take place at somewhat higher momenta than commonly used for the cooling.

MOP002

Tapered Six-Dimensional Cooling Channel for a Muon Collider

106

R. B. Palmer, R.C. Fernow
BNL, Upton, Long Island, New York, USA

A high-luminosity muon collider requires a reduction of the six-dimensional emittance of the captured muon beam by a factor of approximately 10⁶. Most of this cooling takes place in a dispersive channel that simultaneously reduces all six phase space dimensions. We describe a tapered 6D cooling channel that should meet the requirements of a muon collider. The parameters of the channel are given and preliminary simulations are shown of the expected performance.

MOP003

Six-Dimensional Bunch Merging for Muon Collider Cooling

109

R. B. Palmer, R.C. Fernow
BNL, Upton, Long Island, New York, USA

A muon collider requires single, intense, muon bunches with small emittances in all six dimensions. It is most efficient to initally phase-rotate the muons into many separate bunches, cool these bunches in six dimensions (6D), and, when cool enough, merge them into single bunches (one of each sign). Previous studies only merged in longitudinal phase space (2D). In this paper we describe merging in all six dimensions (6D). The scheme uses rf for longitudinal merging, and kickers and transports with differing lengths (trombones) for transverse merging. Preliminary simulations, including incorporation in 6D cooling, is described.

TUP179

Energy Deposition within Superconducting Coils of a 4 MW Target Station

1166

X.P. Ding
UCLA, Los Angeles, California, USA
J.J. Back
University of Warwick, Coventry, United Kingdom
R.C. Fernow, H.G. Kirk, N. Souchlas
BNL, Upton, Long Island, New York, USA
K.T. McDonald
PU, Princeton, New Jersey, USA
R.J. Weggel
Particle Beam Lasers, Inc., Northridge, California, USA

Funding: Work Supported by the United States Department of Energy, Contract No. DE-AC02-98CH10886.
A study of energy deposition within superconducting coils of a 4 MW target station for a neutrino factory or muon collider is presented. Using the MARS code, we simulate the energy deposition within the environment surrounding the target. The radiation is produced by interactions of intense proton beams with a free liquid mercury jet. We study the influence of different shielding materials and shielding configurations on the energy deposition in the superconducting coils of the target/capture system. We also examine energy depositions for alternative configurations that allow more space for shielding, thus providing more protection for the superconducting coils.

TUP265

A Solenoid Capture System for a Muon Collider

1316

H.G. Kirk, R.C. Fernow, N. Souchlas
BNL, Upton, Long Island, New York, USA
J.J. Back
University of Warwick, Coventry, United Kingdom
C.J. Densham, P. Loveridge
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
X.P. Ding
UCLA, Los Angeles, California, USA
V.B. Graves
ORNL, Oak Ridge, Tennessee, USA
T. Guo, F. Ladeinde, V. Samulyak, Y. Zhan
SUNY SB, Stony Brook, New York, USA
K.T. McDonald
PU, Princeton, New Jersey, USA
R.J. Weggel
Particle Beam Lasers, Inc., Northridge, California, USA

Funding: This work was supported in part by the US DOE Contract No. DE-AC02-98CH10886.
The concept for a muon-production system for a muon collider or neutrino factory calls for an intense 4-MW-class proton beam impinging upon a free-flowing mercury jet immersed in a 20-T solenoid field. This system is challenging in many aspects, including magnetohydrodynamics of the mercury jet subject to disruption by the proton beam, strong intermagnetic forces, and the intense thermal loads and substantial radiation damage to the magnet coils due to secondary particles from the target. Studies of these issues are ongoing, with a sketch of their present status given here.

THOBN2

Muon Collider Final Cooling in 30-50 T Solenoids

2061

R. B. Palmer, R.C. Fernow
BNL, Upton, Long Island, New York, USA
J.L. Lederman
UCLA, Los Angeles, California, USA

Muon ionization cooling to the required transverse emittance of 25 microns can be achieved with liquid hydrogen in high field solenoids, provided that the momenta are low enough. At low momenta, the longitudinal emittance rises because of the negative slope of energy loss versus energy. Assuming initial emittances that have been achieved in six dimensional cooling simulations, optimized designs are given using solenoid fields limited to 30, 40, and 50 T. The required final emittances are achieved for the two higher field cases.

Slides THOBN2 [0.319 MB]

Paper	Title	Page
MOP001	Charge Separation for Muon Collider Cooling	103
	R. B. Palmer, R.C. Fernow BNL, Upton, Long Island, New York, USA
	Most schemes for six dimensional muon ionization cooling work for only one sign. It is then necessary to have charge separation prior to that cooling. Schemes of charge separation using bent solenoids are described, and their simulated performances reported. It is found that for efficient separation, it should take place at somewhat higher momenta than commonly used for the cooling.

MOP002	Tapered Six-Dimensional Cooling Channel for a Muon Collider	106
	R. B. Palmer, R.C. Fernow BNL, Upton, Long Island, New York, USA
	A high-luminosity muon collider requires a reduction of the six-dimensional emittance of the captured muon beam by a factor of approximately 10⁶. Most of this cooling takes place in a dispersive channel that simultaneously reduces all six phase space dimensions. We describe a tapered 6D cooling channel that should meet the requirements of a muon collider. The parameters of the channel are given and preliminary simulations are shown of the expected performance.

MOP003	Six-Dimensional Bunch Merging for Muon Collider Cooling	109
	R. B. Palmer, R.C. Fernow BNL, Upton, Long Island, New York, USA
	A muon collider requires single, intense, muon bunches with small emittances in all six dimensions. It is most efficient to initally phase-rotate the muons into many separate bunches, cool these bunches in six dimensions (6D), and, when cool enough, merge them into single bunches (one of each sign). Previous studies only merged in longitudinal phase space (2D). In this paper we describe merging in all six dimensions (6D). The scheme uses rf for longitudinal merging, and kickers and transports with differing lengths (trombones) for transverse merging. Preliminary simulations, including incorporation in 6D cooling, is described.

TUP179	Energy Deposition within Superconducting Coils of a 4 MW Target Station	1166
	X.P. Ding UCLA, Los Angeles, California, USA J.J. Back University of Warwick, Coventry, United Kingdom R.C. Fernow, H.G. Kirk, N. Souchlas BNL, Upton, Long Island, New York, USA K.T. McDonald PU, Princeton, New Jersey, USA R.J. Weggel Particle Beam Lasers, Inc., Northridge, California, USA
	Funding: Work Supported by the United States Department of Energy, Contract No. DE-AC02-98CH10886. A study of energy deposition within superconducting coils of a 4 MW target station for a neutrino factory or muon collider is presented. Using the MARS code, we simulate the energy deposition within the environment surrounding the target. The radiation is produced by interactions of intense proton beams with a free liquid mercury jet. We study the influence of different shielding materials and shielding configurations on the energy deposition in the superconducting coils of the target/capture system. We also examine energy depositions for alternative configurations that allow more space for shielding, thus providing more protection for the superconducting coils.

TUP265	A Solenoid Capture System for a Muon Collider	1316
	H.G. Kirk, R.C. Fernow, N. Souchlas BNL, Upton, Long Island, New York, USA J.J. Back University of Warwick, Coventry, United Kingdom C.J. Densham, P. Loveridge STFC/RAL, Chilton, Didcot, Oxon, United Kingdom X.P. Ding UCLA, Los Angeles, California, USA V.B. Graves ORNL, Oak Ridge, Tennessee, USA T. Guo, F. Ladeinde, V. Samulyak, Y. Zhan SUNY SB, Stony Brook, New York, USA K.T. McDonald PU, Princeton, New Jersey, USA R.J. Weggel Particle Beam Lasers, Inc., Northridge, California, USA
	Funding: This work was supported in part by the US DOE Contract No. DE-AC02-98CH10886. The concept for a muon-production system for a muon collider or neutrino factory calls for an intense 4-MW-class proton beam impinging upon a free-flowing mercury jet immersed in a 20-T solenoid field. This system is challenging in many aspects, including magnetohydrodynamics of the mercury jet subject to disruption by the proton beam, strong intermagnetic forces, and the intense thermal loads and substantial radiation damage to the magnet coils due to secondary particles from the target. Studies of these issues are ongoing, with a sketch of their present status given here.

THOBN2	Muon Collider Final Cooling in 30-50 T Solenoids	2061
	R. B. Palmer, R.C. Fernow BNL, Upton, Long Island, New York, USA J.L. Lederman UCLA, Los Angeles, California, USA
	Muon ionization cooling to the required transverse emittance of 25 microns can be achieved with liquid hydrogen in high field solenoids, provided that the momenta are low enough. At low momenta, the longitudinal emittance rises because of the negative slope of energy loss versus energy. Assuming initial emittances that have been achieved in six dimensional cooling simulations, optimized designs are given using solenoid fields limited to 30, 40, and 50 T. The required final emittances are achieved for the two higher field cases.
	Slides THOBN2 [0.319 MB]