2011 Particle Accelerator Conference - List of Authors (Zwaska, R.M.)

Paper

Title

Page

Electron Cloud Experiments at Fermilab: Formation and Mitigation

27

R.M. Zwaska
Fermilab, Batavia, USA

We have performed a series at Fermilab to explore the Electron Cloud phenomenon. The Main Injector will have its beam intensity increased four-fold in the Project X upgrade, and would be subject to instabilities from the Electron Cloud. We present measurements of the Cloud formation in the Main Injector and experiments with materials for the mitigation of the Cloud. An experimental installation of Titanium-Nitride (TiN) coated beam pipes has been under study in the Main Injector since 2009; this material was directly compared to an adjacent stainless chamber through Electron Cloud measurement with Retarding Field Analyzers (RFAs). Over the long period of running we were able to observe the secondary electron yield (SEY) change and correlate it with electron fluence, establishing a conditioning history. Additionally, the installation has allowed measurement of the electron energy spectrum, comparison of instrumentation techniques, and energy-dependent behavior of the Electron Cloud. Finally, a new installation, developed in conjunction with Cornell and SLAC, will allow direct SEY measurement of material samples irradiated in the accelerator.

Slides MOOBS4 [2.975 MB]

WEP248

Overview of the LBNE Neutrino Beam

1948

C.D. Moore, Y. He, P. Hurh, J. Hylen, B.G. Lundberg, M.W. McGee, J.R. Misek, N.V. Mokhov, V. Papadimitriou, R.K. Plunkett, R.P. Schultz, G. Velev, K.E. Williams, R.M. Zwaska
Fermilab, Batavia, USA

Funding: Work supported by Fermi Research Alliance, LLC, under contract DE-AC02-07CH11359 with the U.S. Department of Energy.
The Long Baseline Neutrino Experiment (LBNE) will utilize a neutrino beamline facility located at Fermilab. The facility will aim a beam of neutrinos toward a detector placed at the Deep Underground Science and Engineering Laboratory (DUSEL) in South Dakota. The neutrinos are produced in a three step process. First, protons from the Main Injector hit a solid target and produce mesons. Then, the charged mesons are focused by a set of focusing horns into the decay pipe, towards the far detector. Finally, the mesons that enter the decay pipe decay into neutrinos. The parameters of the facility were determined by an amalgam of the physics goals, the Monte Carlo modeling of the facility, and the experience gained by operating the NuMI facility at Fermilab. The initial beam power is expected to be ~700 kW, however some of the parameters were chosen to be able to deal with a beam power of 2.3 MW.

Paper	Title	Page
MOOBS4	Electron Cloud Experiments at Fermilab: Formation and Mitigation	27
	R.M. Zwaska Fermilab, Batavia, USA
	We have performed a series at Fermilab to explore the Electron Cloud phenomenon. The Main Injector will have its beam intensity increased four-fold in the Project X upgrade, and would be subject to instabilities from the Electron Cloud. We present measurements of the Cloud formation in the Main Injector and experiments with materials for the mitigation of the Cloud. An experimental installation of Titanium-Nitride (TiN) coated beam pipes has been under study in the Main Injector since 2009; this material was directly compared to an adjacent stainless chamber through Electron Cloud measurement with Retarding Field Analyzers (RFAs). Over the long period of running we were able to observe the secondary electron yield (SEY) change and correlate it with electron fluence, establishing a conditioning history. Additionally, the installation has allowed measurement of the electron energy spectrum, comparison of instrumentation techniques, and energy-dependent behavior of the Electron Cloud. Finally, a new installation, developed in conjunction with Cornell and SLAC, will allow direct SEY measurement of material samples irradiated in the accelerator.
	Slides MOOBS4 [2.975 MB]

WEP248	Overview of the LBNE Neutrino Beam	1948
	C.D. Moore, Y. He, P. Hurh, J. Hylen, B.G. Lundberg, M.W. McGee, J.R. Misek, N.V. Mokhov, V. Papadimitriou, R.K. Plunkett, R.P. Schultz, G. Velev, K.E. Williams, R.M. Zwaska Fermilab, Batavia, USA
	Funding: Work supported by Fermi Research Alliance, LLC, under contract DE-AC02-07CH11359 with the U.S. Department of Energy. The Long Baseline Neutrino Experiment (LBNE) will utilize a neutrino beamline facility located at Fermilab. The facility will aim a beam of neutrinos toward a detector placed at the Deep Underground Science and Engineering Laboratory (DUSEL) in South Dakota. The neutrinos are produced in a three step process. First, protons from the Main Injector hit a solid target and produce mesons. Then, the charged mesons are focused by a set of focusing horns into the decay pipe, towards the far detector. Finally, the mesons that enter the decay pipe decay into neutrinos. The parameters of the facility were determined by an amalgam of the physics goals, the Monte Carlo modeling of the facility, and the experience gained by operating the NuMI facility at Fermilab. The initial beam power is expected to be ~700 kW, however some of the parameters were chosen to be able to deal with a beam power of 2.3 MW.