PAC2013 - List of Authors (Mokhov, N.V.)

Paper	Title	Page
MOPMA21	An Optimization Study of the Target Subsystem for the New g-2 Experiment	345
	C.Y. Yoshikawa, C.M. Ankenbrandt Muons, Inc, Illinois, USA A.F. Leveling, N.V. Mokhov, J.P. Morgan, D.V. Neuffer, S.I. Striganov Fermilab, Batavia, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy A precision measurement of the muon anomalous magnetic moment, aμ = (g-2)/2, was previously performed at BNL with a result of 2.2 - 2.7 standard deviations above the Standard Model (SM) theoretical calculations. The same experimental apparatus is being planned to run in the new Muon Campus at Fermilab, where the muon beam is expected to have less pion contamination and the extended dataset may provide a possible 7.5σ deviation from the SM, creating a sensitive and complementary benchmark for proposed SM extensions. We report here on a study performed on the target subsystem utilizing a new optimization technique that overcomes complexities of asymmetric particle production and depth of focus of a Li lens. This new technique is applied to an apparatus that is optimized for pions that have favourable phase space to create polarized daughter muons around the magic momentum of 3.094 GeV/c, which is needed by the downstream g 2 muon ring.

THPBA14	Impact of Radiation on the Mu2e Production Solenoid Performance	1259
	V.V. Kashikhin, N. Dhanaraj, M.J. Lamm, N.V. Mokhov, V.S. Pronskikh Fermilab, Batavia, USA
	Funding: This work was supported in part by Fermi Research Alliance under the U.S. Department of Energy Contract DE-AC02-07CH11359. The Muon-to-Electron conversion experiment (Mu2e), under development at Fermilab, seeks to detect direct muon to electron conversion to provide evidence for processes violating muon and electron lepton number conservation that cannot be explained by the Standard Model of particle physics. The Mu2e magnet system consists of three large superconducting solenoids. The first in the chain of magnets is the Production Solenoid that collects and focuses pions, generated in interactions of 8-GeV proton beam with the tungsten target, and muons from pion decays by supplying a peak axial field of 4.6T and an axial field gradient of ~1T/m within 1.5m warm bore. The superconducting coils are protected from the secondary particle radiation by 50-cm thick heat and radiation shield made of bronze, which was optimized for the energy absorption and cost. Despite this optimization, a significant fraction of the particle radiation reaches the superconducting coils, creating the heat dissipation and changes in the material properties that in turn affect the magnet thermal and electrical performance. This paper describes the impact of radiation on the magnet cooling, stability and quench protection.

THPBA19	Storage Ring and Interaction Region Magnets for a μ+μ- Higgs Factory	1271
	A.V. Zlobin, Y.I. Alexahin, V.V. Kapin, V.V. Kashikhin, N.V. Mokhov, S.I. Striganov, I.S. Tropin Fermilab, Batavia, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and Muon Accelerator Program (MAP) A low-energy Muon Collider (MC) offers unique opportunities to study the recently found Higgs boson. However, due to a relatively large beam emittance with moderate cooling in this machine, large-aperture high-field superconducting (SC) magnets are required. The magnets need also an adequate margin to operate at a large radiation load from the muon decay showers. General specifications of the SC dipoles and quadrupoles for the 125 GeV c.o.m. Higgs Factory with an average luminosity of ~2·1031 cm^-2s⁻¹ are formulated. Magnet conceptual designs and parameters are reported. The impact of the magnet fringe fields on the beam dynamics as well as the IR and lattice magnet protection from radiation are also reported and discussed.

Paper

Title

Page

An Optimization Study of the Target Subsystem for the New g-2 Experiment

345

C.Y. Yoshikawa, C.M. Ankenbrandt
Muons, Inc, Illinois, USA
A.F. Leveling, N.V. Mokhov, J.P. Morgan, D.V. Neuffer, S.I. Striganov
Fermilab, Batavia, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy
A precision measurement of the muon anomalous magnetic moment, aμ = (g-2)/2, was previously performed at BNL with a result of 2.2 - 2.7 standard deviations above the Standard Model (SM) theoretical calculations. The same experimental apparatus is being planned to run in the new Muon Campus at Fermilab, where the muon beam is expected to have less pion contamination and the extended dataset may provide a possible 7.5σ deviation from the SM, creating a sensitive and complementary benchmark for proposed SM extensions. We report here on a study performed on the target subsystem utilizing a new optimization technique that overcomes complexities of asymmetric particle production and depth of focus of a Li lens. This new technique is applied to an apparatus that is optimized for pions that have favourable phase space to create polarized daughter muons around the magic momentum of 3.094 GeV/c, which is needed by the downstream g 2 muon ring.

THPBA14

Impact of Radiation on the Mu2e Production Solenoid Performance

1259

V.V. Kashikhin, N. Dhanaraj, M.J. Lamm, N.V. Mokhov, V.S. Pronskikh
Fermilab, Batavia, USA

Funding: This work was supported in part by Fermi Research Alliance under the U.S. Department of Energy Contract DE-AC02-07CH11359.
The Muon-to-Electron conversion experiment (Mu2e), under development at Fermilab, seeks to detect direct muon to electron conversion to provide evidence for processes violating muon and electron lepton number conservation that cannot be explained by the Standard Model of particle physics. The Mu2e magnet system consists of three large superconducting solenoids. The first in the chain of magnets is the Production Solenoid that collects and focuses pions, generated in interactions of 8-GeV proton beam with the tungsten target, and muons from pion decays by supplying a peak axial field of 4.6T and an axial field gradient of ~1T/m within 1.5m warm bore. The superconducting coils are protected from the secondary particle radiation by 50-cm thick heat and radiation shield made of bronze, which was optimized for the energy absorption and cost. Despite this optimization, a significant fraction of the particle radiation reaches the superconducting coils, creating the heat dissipation and changes in the material properties that in turn affect the magnet thermal and electrical performance. This paper describes the impact of radiation on the magnet cooling, stability and quench protection.

THPBA19

Storage Ring and Interaction Region Magnets for a μ+μ- Higgs Factory

1271

A.V. Zlobin, Y.I. Alexahin, V.V. Kapin, V.V. Kashikhin, N.V. Mokhov, S.I. Striganov, I.S. Tropin
Fermilab, Batavia, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy and Muon Accelerator Program (MAP)
A low-energy Muon Collider (MC) offers unique opportunities to study the recently found Higgs boson. However, due to a relatively large beam emittance with moderate cooling in this machine, large-aperture high-field superconducting (SC) magnets are required. The magnets need also an adequate margin to operate at a large radiation load from the muon decay showers. General specifications of the SC dipoles and quadrupoles for the 125 GeV c.o.m. Higgs Factory with an average luminosity of ~2·1031 cm^-2s⁻¹ are formulated. Magnet conceptual designs and parameters are reported. The impact of the magnet fringe fields on the beam dynamics as well as the IR and lattice magnet protection from radiation are also reported and discussed.