IPAC2013 - List of Authors (Marhauser, F.)

Paper	Title	Page
TUPFI068	High Power Tests of Alumina in High Pressure RF Cavities for Muon Ionization Cooling Channel	1508
	L.M. Nash University of Chicago, Chicago, Illinois, USA G. Flanagan, R.P. Johnson, F. Marhauser, J.H. Nipper Muons. Inc., USA M.A. Leonova, A. Moretti, M. Popovic, A.V. Tollestrup, K. Yonehara Fermilab, Batavia, USA Y. Torun IIT, Chicago, Illinois, USA
	It is important to make a compact muon ionization cooling channel to increase the cooling efficiency (muon survival rate, cooling decrement, etc). A proposed scheme to reduce the radial size of RF cavities at a given resonance frequency is to insert a dielectric material into the RF cavity. In vacuum cavities, however, dielectric materials are extremely susceptible to breakdown in high power conditions. High-pressure hydrogen gas has been shown to inhibit breakdown events in RF cavities in strong magnetic fields. An experiment has been designed to test surface breakdown of alumina in RF cavities. A structure has been designed to maximize the parallel field parallel to the surface while bringing the cavity into a desired frequency range (800-810MHz). Alumina is tested in this configuration under high power conditions. The experimental result will be shown in this presentation.

THPWA047	GEM*STAR - New Nuclear Technology to Produce Inexpensive Diesel Fuel from Natural Gas and Carbon	3738
	R.P. Johnson, F. Marhauser Muons. Inc., USA C. Bowman, R.B. Vogelaar ADNA, Los Alamos, New Mexico, USA
	The 75,000 tons of US stored spent nuclear fuel (SNF) from conventional nuclear reactors is a resource that could provide 125 years of all US electrical power. Or it could also provide a great amount of process heat for many applications like producing green diesel fuel from natural gas and renewable carbon. An accelerator system like the SNS at ORNL can provide neutrons to convert SNF into fissile isotopes to provide high temperature heat using technology developed at the ORNL Molten Salt Reactor Experiment. In the GEMSTAR accelerator-driven subcritical reactor that we wish to build, the accelerator allows subcritical operation (no Chernobyls), the molten salt fuel allows volatiles to be continuously removed (no Fukushimas), and the SNF does not need to be enriched or reprocessed (to minimize weapons proliferation concerns). The molten salt fuel and the relaxed availability requirements of process heat applications imply that the required accelerator technology is available now. A new opportunity has arisen to use GEMSTAR to reduce the world’s inventory of weapons-grade plutonium leaving only remnants that are permanently unusable for nuclear weapons. * Charles D. Bowman et al., “GEM*STAR: The Alternative Reactor Technology Comprising Graphite, Molten Salt, and Accelerators,” Handbook of Nuclear Engineering, Springer (2010).

Paper

Title

Page

High Power Tests of Alumina in High Pressure RF Cavities for Muon Ionization Cooling Channel

1508

L.M. Nash
University of Chicago, Chicago, Illinois, USA
G. Flanagan, R.P. Johnson, F. Marhauser, J.H. Nipper
Muons. Inc., USA
M.A. Leonova, A. Moretti, M. Popovic, A.V. Tollestrup, K. Yonehara
Fermilab, Batavia, USA
Y. Torun
IIT, Chicago, Illinois, USA

It is important to make a compact muon ionization cooling channel to increase the cooling efficiency (muon survival rate, cooling decrement, etc). A proposed scheme to reduce the radial size of RF cavities at a given resonance frequency is to insert a dielectric material into the RF cavity. In vacuum cavities, however, dielectric materials are extremely susceptible to breakdown in high power conditions. High-pressure hydrogen gas has been shown to inhibit breakdown events in RF cavities in strong magnetic fields. An experiment has been designed to test surface breakdown of alumina in RF cavities. A structure has been designed to maximize the parallel field parallel to the surface while bringing the cavity into a desired frequency range (800-810MHz). Alumina is tested in this configuration under high power conditions. The experimental result will be shown in this presentation.

THPWA047

GEM*STAR - New Nuclear Technology to Produce Inexpensive Diesel Fuel from Natural Gas and Carbon

3738

R.P. Johnson, F. Marhauser
Muons. Inc., USA
C. Bowman, R.B. Vogelaar
ADNA, Los Alamos, New Mexico, USA

The 75,000 tons of US stored spent nuclear fuel (SNF) from conventional nuclear reactors is a resource that could provide 125 years of all US electrical power. Or it could also provide a great amount of process heat for many applications like producing green diesel fuel from natural gas and renewable carbon. An accelerator system like the SNS at ORNL can provide neutrons to convert SNF into fissile isotopes to provide high temperature heat using technology developed at the ORNL Molten Salt Reactor Experiment. In the GEM*STAR accelerator-driven subcritical reactor that we wish to build, the accelerator allows subcritical operation (no Chernobyls), the molten salt fuel allows volatiles to be continuously removed (no Fukushimas), and the SNF does not need to be enriched or reprocessed (to minimize weapons proliferation concerns). The molten salt fuel and the relaxed availability requirements of process heat applications imply that the required accelerator technology is available now. A new opportunity has arisen to use GEM*STAR to reduce the world’s inventory of weapons-grade plutonium leaving only remnants that are permanently unusable for nuclear weapons.
* Charles D. Bowman et al., “GEM*STAR: The Alternative Reactor Technology Comprising Graphite, Molten Salt, and Accelerators,” Handbook of Nuclear Engineering, Springer (2010).