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Your search keyword '"Ou, Longwu"' showing total 2 results
Start Over Author "Ou, Longwu" Topic accelerator physics (physics.acc-ph)
2 results on '"Ou, Longwu"'

1. Transmission of High-Power Electron Beams Through Small Apertures

Author

L. Ou, William Bertozzi, R. Cowan, Pavel Evtushenko, A. Kelleher, S. Balascuta, C. Tschalär, George R. Neil, Ricardo Alarcon, Ross Milner, Robert Legg, Chris Tennant, E. Ihloff, N. Kalantarians, P. H. Fisher, James Boyce, Shukui Zhang, B. Schmookler, David Douglas, Gustavious P. Williams, S.V. Benson, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Tschalar, Christoph, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, and Schmookler, Barak Abraham

Subjects
Accelerator Physics (physics.acc-ph), Physics, Nuclear and High Energy Physics, Beam diameter, business.industry, Aperture, FOS: Physical sciences, Electron, Linear particle accelerator, Optics, Transmission (telecommunications), Cathode ray, Physics - Accelerator Physics, Laser beam quality, business, Instrumentation, Beam divergence
Abstract

Tests were performed to pass a 100 MeV, 430 kWatt c.w. electron beam from the energy-recovery linac at the Jefferson Laboratory's FEL facility through a set of small apertures in a 127 mm long aluminum block. Beam transmission losses of 3 p.p.m. through a 2 mm diameter aperture were maintained during a 7 h continuous run., United States. Dept. of Energy (Contract DE-AC05-060R23177), United States. Dept. of Energy (MIT Nuclear Contract DE-FG02-94ER40818), Commonwealth of Virginia

Published
2013

2. Measured Radiation and Background Levels During Transmission of Megawatt Electron Beams Through Millimeter Apertures

Author

George R. Neil, L. Ou, E. Ihloff, Shukui Zhang, R. Cowan, Gustavious P. Williams, Pavel Evtushenko, W. J. Kossler, C. Tschalär, James Boyce, William Bertozzi, P. H. Fisher, N. Kalantarians, S. Balascuta, B. Schmookler, S.V. Benson, E. Long, A. Kelleher, Ricardo Alarcon, Ross Milner, Chris Tennant, Robert Legg, David Douglas, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Bertozzi, William, Cowan, Ray Franklin, Fisher, Peter H., Ihloff, Ernest E., Kelleher, Aidan, Milner, Richard G., Ou, Longwu, Schmookler, Barak Abraham, and Tschalar, Christoph

Subjects
Accelerator Physics (physics.acc-ph), Physics, Nuclear and High Energy Physics, Photon, Aperture, business.industry, FOS: Physical sciences, Radiation, Neutron radiation, Laser, Linear particle accelerator, law.invention, Optics, law, Cathode ray, Physics::Accelerator Physics, Physics - Accelerator Physics, business, Instrumentation, Beam (structure)
Abstract

We report measurements of photon and neutron radiation levels observed while transmitting a 0.43 MW electron beam through millimeter-sized apertures and during beam-off, but accelerating gradient RF-on, operation. These measurements were conducted at the Free-Electron Laser (FEL) facility of the Jefferson National Accelerator Laboratory (JLab) using a 100 MeV electron beam from an energy-recovery linear accelerator. The beam was directed successively through 6 mm, 4 mm, and 2 mm diameter apertures of length 127 mm in aluminum at a maximum current of 4.3 mA (430 kW beam power). This study was conducted to characterize radiation levels for experiments that need to operate in this environment, such as the proposed DarkLight Experiment. We find that sustained transmission of a 430 kW continuous-wave (CW) beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also find that during beam-off, RF-on operation, multipactoring inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation when the machine is tuned for 130 MeV operation., 9 pages, 11 figures, submitted to Nuclear Instruments and Methods in Physics Research Section A

Published
2013

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