PAC2013 - List of Authors (Hanlet, P.M.)

Paper

Title

Page

High Pressure Gas-Filled RF Cavities for Use in a Muon Cooling Channel

419

B.T. Freemire, P.M. Hanlet, Y. Torun
IIT, Chicago, Illinois, USA
M. Chung, M.R. Jana, M.A. Leonova, A. Moretti, T.A. Schwarz, A.V. Tollestrup, Y. Torun, K. Yonehara
Fermilab, Batavia, USA
M.G. Collura
Politecnico di Torino, Torino, Italy
R.P. Johnson
Muons, Inc, Illinois, USA

A high pressure hydrogen gas-filled RF (HPRF) cavity can operate in the multi-Tesla magnetic fields required for a muon accelerator cooling channel. A beam test was performed at the Fermilab MuCool Test Area by sending a 400 MeV proton beam through an 805 MHz cavity and quantifying the effects of the resulting plasma within the cavity. The resulting energy loss per electron-ion pair produced has been measured at 10^-18 to 10^-16 J every RF cycle. Doping the hydrogen gas with oxygen greatly decreases the lifetime of an electron, thereby improving the performance of the HPRF cavity. Electron lifetimes as short as 1 ns have been measured. The recombination rate of positive and negative ions in the cavity has been measured on the order of 10^-8 cm³/s. Extrapolation in both gas pressure and beam intensity are required to obtain Muon Collider parameters, however the results indicate HPRF cavities can be used in a muon accelerator cooling channel.

Slides TUODA1 [12.191 MB]

WEPMA03

Tuner System Assembly and Tests for the 201-MHz MICE Cavity

987

L. Somaschini
INFN-Pisa, Pisa, Italy
A.J. DeMello, D. Li, S.P. Virostek
LBNL, Berkeley, California, USA
P.M. Hanlet
IIT, Chicago, Illinois, USA
A. Moretti, R.J. Pasquinelli, D.W. Peterson, Y. Torun
Fermilab, Batavia, USA

Funding: Supported by the US Department of Energy.
The MICE cavities include a mechanical tuning system consisting of stainless steel flexure forks attached to the cavity body and driven by pneumatic actuators. The first of these systems was assembled and tested at Fermilab for use at the MuCool Test Area. The actuators were calibrated on a test hoop. The cavity body was measured and the fork contact pads machined to fit. Actuators were mounted on the vacuum vessel housing the cavity. The transfer function of the tuning system was measured and frequency control software implemented.

WEPMA16

Assembly and Testing of the First 201-MHz MICE Cavity at Fermilab

1016

Y. Torun
Illinois Institute of Technology, Chicago, IL, USA
D.L. Bowring, A.J. DeMello, D. Li, T.H. Luo, S.P. Virostek
LBNL, Berkeley, California, USA
P.M. Hanlet
IIT, Chicago, Illinois, USA
M.A. Leonova, A. Moretti, R.J. Pasquinelli, D.W. Peterson, R.P. Schultz, J.T. Volk
Fermilab, Batavia, USA
T.H. Luo
UMiss, University, Mississippi, USA
L. Somaschini
INFN-Pisa, Pisa, Italy

Funding: Supported by the US Department of Energy.
The International Muon Ionization Cooling Experiment (MICE) includes two linear accelerator sections with four RF cavities each within a shared vacuum vessel. Ten cavity bodies have been fabricated for MICE including two spares and one was electropolished. A special vacuum vessel was built to house this cavity and form the 201-MHz Single-Cavity Module. The module was assembled, instrumented and tested at Fermilab for installation and operation in the MuCool Test Area.

Paper	Title	Page
TUODA1	High Pressure Gas-Filled RF Cavities for Use in a Muon Cooling Channel	419
	B.T. Freemire, P.M. Hanlet, Y. Torun IIT, Chicago, Illinois, USA M. Chung, M.R. Jana, M.A. Leonova, A. Moretti, T.A. Schwarz, A.V. Tollestrup, Y. Torun, K. Yonehara Fermilab, Batavia, USA M.G. Collura Politecnico di Torino, Torino, Italy R.P. Johnson Muons, Inc, Illinois, USA
	A high pressure hydrogen gas-filled RF (HPRF) cavity can operate in the multi-Tesla magnetic fields required for a muon accelerator cooling channel. A beam test was performed at the Fermilab MuCool Test Area by sending a 400 MeV proton beam through an 805 MHz cavity and quantifying the effects of the resulting plasma within the cavity. The resulting energy loss per electron-ion pair produced has been measured at 10^-18 to 10^-16 J every RF cycle. Doping the hydrogen gas with oxygen greatly decreases the lifetime of an electron, thereby improving the performance of the HPRF cavity. Electron lifetimes as short as 1 ns have been measured. The recombination rate of positive and negative ions in the cavity has been measured on the order of 10^-8 cm³/s. Extrapolation in both gas pressure and beam intensity are required to obtain Muon Collider parameters, however the results indicate HPRF cavities can be used in a muon accelerator cooling channel.
	Slides TUODA1 [12.191 MB]

WEPMA03	Tuner System Assembly and Tests for the 201-MHz MICE Cavity	987
	L. Somaschini INFN-Pisa, Pisa, Italy A.J. DeMello, D. Li, S.P. Virostek LBNL, Berkeley, California, USA P.M. Hanlet IIT, Chicago, Illinois, USA A. Moretti, R.J. Pasquinelli, D.W. Peterson, Y. Torun Fermilab, Batavia, USA
	Funding: Supported by the US Department of Energy. The MICE cavities include a mechanical tuning system consisting of stainless steel flexure forks attached to the cavity body and driven by pneumatic actuators. The first of these systems was assembled and tested at Fermilab for use at the MuCool Test Area. The actuators were calibrated on a test hoop. The cavity body was measured and the fork contact pads machined to fit. Actuators were mounted on the vacuum vessel housing the cavity. The transfer function of the tuning system was measured and frequency control software implemented.

WEPMA16	Assembly and Testing of the First 201-MHz MICE Cavity at Fermilab	1016
	Y. Torun Illinois Institute of Technology, Chicago, IL, USA D.L. Bowring, A.J. DeMello, D. Li, T.H. Luo, S.P. Virostek LBNL, Berkeley, California, USA P.M. Hanlet IIT, Chicago, Illinois, USA M.A. Leonova, A. Moretti, R.J. Pasquinelli, D.W. Peterson, R.P. Schultz, J.T. Volk Fermilab, Batavia, USA T.H. Luo UMiss, University, Mississippi, USA L. Somaschini INFN-Pisa, Pisa, Italy
	Funding: Supported by the US Department of Energy. The International Muon Ionization Cooling Experiment (MICE) includes two linear accelerator sections with four RF cavities each within a shared vacuum vessel. Ten cavity bodies have been fabricated for MICE including two spares and one was electropolished. A special vacuum vessel was built to house this cavity and form the 201-MHz Single-Cavity Module. The module was assembled, instrumented and tested at Fermilab for installation and operation in the MuCool Test Area.