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

Paper	Title	Page
MOP051	End-to-End Simulation of an Inverse Cyclotron for Muon Cooling	193
	K. Paul, E. Cormier-Michel Tech-X, Boulder, Colorado, USA T. Hart, D.J. Summers UMiss, University, Mississippi, USA
	Funding: DOE Office of High-Energy Physics, SBIR DE-FG02-08ER85044 Neutrino factories and muon colliders require significant cooling of the muon beam. Most muon cooling channels are long and expensive single-pass structures, due to the difficulty injecting very large emittance beams into a circular device. Inverse cyclotrons can potentially solve the injection problems associated with other circular cooling channels, and they can potentially provide substantial initial cooling of the beam. We present the first end-to-end (injection to extraction) simulations of an inverse cyclotron for muon cooling, performed with the particle-in-cell code VORPAL. We study the cooling capability of the device as well as potential limitations due to space charge effects and material interactions with the beam.

TUP290	Progress on MICE RFCC Module for the MICE Experiment	1370
	A.J. DeMello, N. Andresen, M.A. Green, D. Li, S.P. Virostek, M.S. Zisman LBNL, Berkeley, California, USA Y. Cao, S. Sun, L. Wang, L. Yin SINAP, Shanghai, People's Republic of China A.B. Chen, X.K. Liu, H. Pan, F.Y. Xu ICST, Harbin, People's Republic of China M. Reep, D.J. Summers UMiss, University, Mississippi, USA
	Funding: This work is supported by the Office of Science, United States Department of Energy under DOE contract DE-AC02-05CH11231. We describe the recent progress on the design and fabrication of the RFCC (RF and Coupling Coil) module for the international Muon Ionization Cooling Experiment (MICE). The MICE cooling channel has two RFCC modules; each has four 201-MHz normal conducting RF cavities and one superconducting solenoid magnet. The magnet is designed to be cooled by three cryocoolers. Fabrication of the RF cavities is complete; design and fabrication of the magnets are in progress. The first magnet is expected to be finished by the end of 2011.

WEP190	Magnetic Field Expansion Out of a Plane: Application to Cyclotron Development	1846
	T. Hart, D.J. Summers UMiss, University, Mississippi, USA K. Paul Tech-X, Boulder, Colorado, USA
	In studies of the dynamics of charged particles in a cyclotron magnetic field, the specified field is generally Bz in the z = 0 midplane where Br and Btheta are zero. Br(r,theta, z) and Btheta (r,theta, z) are usually determined through a linear expansion which assumes that Bz is independent of z. An expansion to only first order may not be sufficient for orbit simulations at small r and large z. This paper reviews the expansion of a specified Bz(r,theta, z = 0) out of the z = 0 midplane to arbitrary order, and shows simple examples worked out to 4th order.

Paper

Title

Page

End-to-End Simulation of an Inverse Cyclotron for Muon Cooling

193

K. Paul, E. Cormier-Michel
Tech-X, Boulder, Colorado, USA
T. Hart, D.J. Summers
UMiss, University, Mississippi, USA

Funding: DOE Office of High-Energy Physics, SBIR DE-FG02-08ER85044
Neutrino factories and muon colliders require significant cooling of the muon beam. Most muon cooling channels are long and expensive single-pass structures, due to the difficulty injecting very large emittance beams into a circular device. Inverse cyclotrons can potentially solve the injection problems associated with other circular cooling channels, and they can potentially provide substantial initial cooling of the beam. We present the first end-to-end (injection to extraction) simulations of an inverse cyclotron for muon cooling, performed with the particle-in-cell code VORPAL. We study the cooling capability of the device as well as potential limitations due to space charge effects and material interactions with the beam.

TUP290

Progress on MICE RFCC Module for the MICE Experiment

1370

A.J. DeMello, N. Andresen, M.A. Green, D. Li, S.P. Virostek, M.S. Zisman
LBNL, Berkeley, California, USA
Y. Cao, S. Sun, L. Wang, L. Yin
SINAP, Shanghai, People's Republic of China
A.B. Chen, X.K. Liu, H. Pan, F.Y. Xu
ICST, Harbin, People's Republic of China
M. Reep, D.J. Summers
UMiss, University, Mississippi, USA

Funding: This work is supported by the Office of Science, United States Department of Energy under DOE contract DE-AC02-05CH11231.
We describe the recent progress on the design and fabrication of the RFCC (RF and Coupling Coil) module for the international Muon Ionization Cooling Experiment (MICE). The MICE cooling channel has two RFCC modules; each has four 201-MHz normal conducting RF cavities and one superconducting solenoid magnet. The magnet is designed to be cooled by three cryocoolers. Fabrication of the RF cavities is complete; design and fabrication of the magnets are in progress. The first magnet is expected to be finished by the end of 2011.

WEP190

Magnetic Field Expansion Out of a Plane: Application to Cyclotron Development

1846

T. Hart, D.J. Summers
UMiss, University, Mississippi, USA
K. Paul
Tech-X, Boulder, Colorado, USA

In studies of the dynamics of charged particles in a cyclotron magnetic field, the specified field is generally Bz in the z = 0 midplane where Br and Btheta are zero. Br(r,theta, z) and Btheta (r,theta, z) are usually determined through a linear expansion which assumes that Bz is independent of z. An expansion to only first order may not be sufficient for orbit simulations at small r and large z. This paper reviews the expansion of a specified Bz(r,theta, z = 0) out of the z = 0 midplane to arbitrary order, and shows simple examples worked out to 4th order.