2011 Particle Accelerator Conference - List of Authors (Greenwald, D.)

Paper	Title	Page
MOP017	A Sphere Cooler Scheme for Muon Cooling	139
	Y. Bao MPI, Muenchen, Germany A. Caldwell, D. Greenwald MPI-P, München, Germany
	Muon cooling is the greatest obstacle for producing an intensive muon beam. The frictional cooling method holds promise for delivering low-energy muon beams with narrow energy spreads. We outline a sphere cooler scheme based on frictional cooling to effectively produce such a “cold” muon beam. As an example source, we take the parameters of a surface muon source available at the Paul Scherrer Institute. Simulation results show that the sphere cooler has an efficiency of 50% to produce a “cold” muon beam with an energy spread of 0.9 keV. The high quality beam can potentially meet the requirements of a neutrino factory or a muon collider.

MOP018	The Impact of Beam Emittance on BSM-Physics Discovery Potential at a Muon Collider	142
	D. Greenwald, A. Caldwell MPI-P, München, Germany
	A muon collider would allow for high precision probing of the multi-TeV energy regime and the potential discovery of new physics. Background radiation from electrons from the decay of muons interacting with the beam pipes near the interaction point (IP) places limitations on the design of a muon-collider detector. In particular, conical shielding extending out from the IP along the outside of the beam pipes prevents detection of particles at small angles to the beam line. For a given luminosity, bunches with smaller emittances will have fewer muons and therefore smaller background levels, allowing for shielding with shallower angles. The angular-acceptance dependence of the discovery potential for Kaluza-Klein excitations of the standard model particles is presented as a motivation for improved beam-cooling techniques that can achieve high luminosities with small bunch populations.

Paper

Title

Page

A Sphere Cooler Scheme for Muon Cooling

139

Y. Bao
MPI, Muenchen, Germany
A. Caldwell, D. Greenwald
MPI-P, München, Germany

Muon cooling is the greatest obstacle for producing an intensive muon beam. The frictional cooling method holds promise for delivering low-energy muon beams with narrow energy spreads. We outline a sphere cooler scheme based on frictional cooling to effectively produce such a “cold” muon beam. As an example source, we take the parameters of a surface muon source available at the Paul Scherrer Institute. Simulation results show that the sphere cooler has an efficiency of 50% to produce a “cold” muon beam with an energy spread of 0.9 keV. The high quality beam can potentially meet the requirements of a neutrino factory or a muon collider.

MOP018

The Impact of Beam Emittance on BSM-Physics Discovery Potential at a Muon Collider

142

D. Greenwald, A. Caldwell
MPI-P, München, Germany

A muon collider would allow for high precision probing of the multi-TeV energy regime and the potential discovery of new physics. Background radiation from electrons from the decay of muons interacting with the beam pipes near the interaction point (IP) places limitations on the design of a muon-collider detector. In particular, conical shielding extending out from the IP along the outside of the beam pipes prevents detection of particles at small angles to the beam line. For a given luminosity, bunches with smaller emittances will have fewer muons and therefore smaller background levels, allowing for shielding with shallower angles. The angular-acceptance dependence of the discovery potential for Kaluza-Klein excitations of the standard model particles is presented as a motivation for improved beam-cooling techniques that can achieve high luminosities with small bunch populations.