DarkLight radiation backgrounds

Conference · Fri Nov 01 04:00:00 EDT 2013 · AIP Conf. Proc.

DOI:https://doi.org/10.1063/1.4829393· OSTI ID:1108408

Kalantarians, Narbe ^[1]

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1. University of Texas

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-on, 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 CW beam through a 2 mm aperture is feasible with manageable beam-related backgrounds. We also find that during beam-off, RF-on operation, field emission inside the niobium cavities of the accelerator cryomodules is the primary source of ambient radiation.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1108408
• Report Number(s): JLAB-FEL-13-1751; DOE/OR/23177-2917
• Conference Information: Journal Name: AIP Conf. Proc. Journal Volume: 1563
• Country of Publication: United States
• Language: English

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