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A laser-wire beam-energy and beam-profile monitor at the BNL linac [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2011.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Brookhaven National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In 2009 a beam-energy monitor was installed in the high energy beam transport (HEBT) line at the Brookhaven National Lab linac. This device measures the energies of electrons stripped from the 40mA H⁻ beam by background gas. Electrons are stripped by the 2.0x10⁻⁷torr residual gas at a rate of ≈1.5x10⁻⁸/cm. Since beam electrons have the same velocities as beam protons, the beam proton energy is deduced by multiplying the electron energy by m{sub p}/m{sub e}=1836. A 183.6MeV H⁻ beam produces 100keV electrons. In 2010 we installed an optics plates containing a laser and scanning optics to add beam-profile measurement capability via photodetachment. Our 100mJ/pulse, Q-switched laser neutralizes 70% of the beam during its 10ns pulse. This paper describes the upgrades to the detector and gives profile and energy measurements.
Report Numbers
E 1.99:bnl--94171-2011-cp
bnl--94171-2011-cp
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Note
Published through SciTech Connect.
03/28/2011.
"bnl--94171-2011-cp"
"KB0202011"
2011 Particle Accelerator Conference (PAC'11); New York, NY; 20110328 through 20110401.
Degen, C.; Minty, M.; Nayak, S.; Meng, W.; DeSanto, L.; Michnoff, R.; Connolly, R.
Funding Information
DE-AC02-98CH10886
KBCH139
18035
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