Measured Radiation and Background Levels During Transmission of Megawatt Electron Beams Through Millimeter Apertures [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2013.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 233-240 : digital, PDF file
- Additional Creators:
- Thomas Jefferson National Accelerator Facility (U.S.)
United States. Department of Energy. Office of Science
United States. Department of Energy. Office of Scientific and Technical Information
- 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.
- Published through SciTech Connect.
Nuclear Instruments & Methods in Physics Research, Section A 729 FT
Evtushenko, Pavel; Bertozzi, William; Milner, Richard; Alarcon, Ricardo; Zhang, Shukui; Cowan, Ray; Kalantarians, Narbe; Fisher, P.; Balascuta, S.; Douglas, David R.; Boyce, James R.; Benson, Stephen V.; Legg, Robert A.; Neil, George R.; Tennant, Christopher D.; Williams, Gwyn P.; Ihloff, Ernest E.; Kelleher, Aidan Michael; Ou, Longwu; Long, Elena; Krossler, W. J.; Schmookler, Barack Abraham; Tschalar, C.
- Funding Information:
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