PAC2013 - List of Authors (Snopok, P.)

Paper	Title	Page
TUPBA20	A Staged Muon-based Facility to Enable Intensity and Energy Frontier Science in the US	565
	J.-P. Delahaye SLAC, Menlo Park, California, USA C.M. Ankenbrandt Muons, Inc, Illinois, USA C.M. Ankenbrandt, S. Brice, A.D. Bross, D.S. Denisov, E. Eichten, R.J. Lipton, D.V. Neuffer, M.A. Palmer, P. Snopok Fermilab, Batavia, USA S.A. Bogacz JLAB, Newport News, Virginia, USA P. Huber Virginia Polytechnic Institute and State University, Blacksburg, USA D.M. Kaplan, P. Snopok Illinois Institute of Technology, Chicago, Illinois, USA H.G. Kirk, R.B. Palmer BNL, Upton, Long Island, New York, USA R.D. Ryne LBNL, Berkeley, California, USA
	Muon-based facilities offer a unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders ranging from the Higgs energy to the multi-TeV energy range. They rely on novel technology with challenging parameters, which are currently being evaluated by the U.S. Muon Accelerator Program (MAP). A realistic scenario for a complementary series of staged facilities with increasing complexity and significant physics potential at each stage has been developed. It takes advantage of and leverages the capabilities already planned for Fermilab, especially Project X Stage II and LBNE. Each stage is defined in such a way to provide an R&D platform to validate the technologies required for subsequent stages. The rationale and sequence of the staging process, as well as the critical issues to be addressed at each stage, are presented.

MOPBA10	Progress of the Matter-dominated Muon Accelerator Lattice Simulation Tools Development for COSY Infinity	192
	P. Snopok, J.D. Kunz IIT, Chicago, USA
	COSY Infinity is an arbitrary-order beam dynamics simulation and analysis code. It can determine high-order transfer maps of combinations of particle optical elements of arbitrary field configurations. For precision modeling, design, and optimization of next-generation muon beam facilities, its features make it the ideal code. The one component that needs to be included in COSY is the algorithm necessary to follow the distribution of charged particles through matter. Muon beams are tertiary production particles and high-intensity collection necessitates a large initial phase space volume. Therefore, accurate modeling of the dynamics and correction of aberrations is imperative. To study in detail some of the properties of particles passing through material, the transfer map approach alone is not sufficient. The interplay of beam optics and atomic processes must be studied by a hybrid transfer map - Monte-Carlo approach in which transfer map methods are used when there is no material in the accelerator channel, and Monte-Carlo methods when particles pass through material. Progress on the development of the hybrid algorithm is reported.

THPMA10	Energy Deposition in Magnets and Shielding of the Target System of a Staged Neutrino Factory	1376
	X.P. Ding UCLA, Los Angeles, California, USA H.G. Kirk BNL, Upton, Long Island, New York, USA K.T. McDonald PU, Princeton, New Jersey, USA C.T. Rogers STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom P. Snopok IIT, Chicago, Illinois, USA N. Souchlas Particle Beam Lasers, Inc., Northridge, California, USA
	A first stage of a Neutrino Factory based on muon beams might use a pulsed 3-GeV proton beam with 1-MW average power. We report on MARS15 studies of energy deposition in the superconducting magnets and the tungsten-bead shielding of the Target System.

MOPBA09	Multiple Scattering Effects in a Strong Magnetic Field	189
	P. Snopok Illinois Institute of Technology, Chicago, IL, USA J.S. Ellison IIT, Chicago, USA T.J. Roberts Muons, Inc, Illinois, USA
	New computational tools are essential for accurate modeling and simulation of the next generation of muon-based accelerator experiments at the energy and intensity frontiers, such as a muon collider, a neutrino factory, stopping muon beams, or in general any application involving muons. There is a long list of crucial and not-yet-considered physics processes specific to muon accelerators that have not yet been implemented in any current simulation code. Implementing these processes will substantially enhance our confidence that the tools used in simulating and assessing the feasibility of a muon collider or a neutrino factory will accurately represent the performance of a real machine. We report here on the progress of developing advanced modeling tools to include such processes into the G4beamline code, one of the de-facto standard codes used for muon-based accelerator simulations.

MOPBA11	Space Charge Simulation in COSY Using Fast Multipole Method	195
	P. Snopok Illinois Institute of Technology, Chicago, IL, USA M. Berz, B.T. Loseth, K. Makino MSU, East Lansing, Michigan, USA H. Zhang JLAB, Newport News, Virginia, USA
	A method is presented that allows the computation of space charge effects of arbitrary and large distributions of particles in an efficient and accurate way based on a variant of the Fast Multipole Method (FMM). It relies on an automatic multigrid-based decomposition of charges in near and far regions and the use of high-order differential algebra methods to obtain decompositions of far fields that lead to an error that scales with a high power of the order. Given an ensemble of N particles, the method allows the computation of the self-fields of all particles on each other with a computational expense that scales as O(N). Furthermore, the method allows the computation of all high-order multipoles of the space charge fields that are necessary for the computation of high-order transfer maps and all resulting aberrations. Space charge effects are crucial in modeling the latter stages of the six-dimensional (6D) cooling channel for the Muon Collider. FMM has been implemented in COSY Infinity, and the results of applying it to simulating the 6D cooling channel for the Muon Collider are presented.

Paper

Title

Page

A Staged Muon-based Facility to Enable Intensity and Energy Frontier Science in the US

565

J.-P. Delahaye
SLAC, Menlo Park, California, USA
C.M. Ankenbrandt
Muons, Inc, Illinois, USA
C.M. Ankenbrandt, S. Brice, A.D. Bross, D.S. Denisov, E. Eichten, R.J. Lipton, D.V. Neuffer, M.A. Palmer, P. Snopok
Fermilab, Batavia, USA
S.A. Bogacz
JLAB, Newport News, Virginia, USA
P. Huber
Virginia Polytechnic Institute and State University, Blacksburg, USA
D.M. Kaplan, P. Snopok
Illinois Institute of Technology, Chicago, Illinois, USA
H.G. Kirk, R.B. Palmer
BNL, Upton, Long Island, New York, USA
R.D. Ryne
LBNL, Berkeley, California, USA

Muon-based facilities offer a unique potential to provide capabilities at both the Intensity Frontier with Neutrino Factories and the Energy Frontier with Muon Colliders ranging from the Higgs energy to the multi-TeV energy range. They rely on novel technology with challenging parameters, which are currently being evaluated by the U.S. Muon Accelerator Program (MAP). A realistic scenario for a complementary series of staged facilities with increasing complexity and significant physics potential at each stage has been developed. It takes advantage of and leverages the capabilities already planned for Fermilab, especially Project X Stage II and LBNE. Each stage is defined in such a way to provide an R&D platform to validate the technologies required for subsequent stages. The rationale and sequence of the staging process, as well as the critical issues to be addressed at each stage, are presented.

MOPBA10

Progress of the Matter-dominated Muon Accelerator Lattice Simulation Tools Development for COSY Infinity

192

P. Snopok, J.D. Kunz
IIT, Chicago, USA

COSY Infinity is an arbitrary-order beam dynamics simulation and analysis code. It can determine high-order transfer maps of combinations of particle optical elements of arbitrary field configurations. For precision modeling, design, and optimization of next-generation muon beam facilities, its features make it the ideal code. The one component that needs to be included in COSY is the algorithm necessary to follow the distribution of charged particles through matter. Muon beams are tertiary production particles and high-intensity collection necessitates a large initial phase space volume. Therefore, accurate modeling of the dynamics and correction of aberrations is imperative. To study in detail some of the properties of particles passing through material, the transfer map approach alone is not sufficient. The interplay of beam optics and atomic processes must be studied by a hybrid transfer map - Monte-Carlo approach in which transfer map methods are used when there is no material in the accelerator channel, and Monte-Carlo methods when particles pass through material. Progress on the development of the hybrid algorithm is reported.

THPMA10

Energy Deposition in Magnets and Shielding of the Target System of a Staged Neutrino Factory

1376

X.P. Ding
UCLA, Los Angeles, California, USA
H.G. Kirk
BNL, Upton, Long Island, New York, USA
K.T. McDonald
PU, Princeton, New Jersey, USA
C.T. Rogers
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
P. Snopok
IIT, Chicago, Illinois, USA
N. Souchlas
Particle Beam Lasers, Inc., Northridge, California, USA

A first stage of a Neutrino Factory based on muon beams might use a pulsed 3-GeV proton beam with 1-MW average power. We report on MARS15 studies of energy deposition in the superconducting magnets and the tungsten-bead shielding of the Target System.

MOPBA09

Multiple Scattering Effects in a Strong Magnetic Field

189

P. Snopok
Illinois Institute of Technology, Chicago, IL, USA
J.S. Ellison
IIT, Chicago, USA
T.J. Roberts
Muons, Inc, Illinois, USA

New computational tools are essential for accurate modeling and simulation of the next generation of muon-based accelerator experiments at the energy and intensity frontiers, such as a muon collider, a neutrino factory, stopping muon beams, or in general any application involving muons. There is a long list of crucial and not-yet-considered physics processes specific to muon accelerators that have not yet been implemented in any current simulation code. Implementing these processes will substantially enhance our confidence that the tools used in simulating and assessing the feasibility of a muon collider or a neutrino factory will accurately represent the performance of a real machine. We report here on the progress of developing advanced modeling tools to include such processes into the G4beamline code, one of the de-facto standard codes used for muon-based accelerator simulations.

MOPBA11

Space Charge Simulation in COSY Using Fast Multipole Method

195

P. Snopok
Illinois Institute of Technology, Chicago, IL, USA
M. Berz, B.T. Loseth, K. Makino
MSU, East Lansing, Michigan, USA
H. Zhang
JLAB, Newport News, Virginia, USA

A method is presented that allows the computation of space charge effects of arbitrary and large distributions of particles in an efficient and accurate way based on a variant of the Fast Multipole Method (FMM). It relies on an automatic multigrid-based decomposition of charges in near and far regions and the use of high-order differential algebra methods to obtain decompositions of far fields that lead to an error that scales with a high power of the order. Given an ensemble of N particles, the method allows the computation of the self-fields of all particles on each other with a computational expense that scales as O(N). Furthermore, the method allows the computation of all high-order multipoles of the space charge fields that are necessary for the computation of high-order transfer maps and all resulting aberrations. Space charge effects are crucial in modeling the latter stages of the six-dimensional (6D) cooling channel for the Muon Collider. FMM has been implemented in COSY Infinity, and the results of applying it to simulating the 6D cooling channel for the Muon Collider are presented.