Author: McCaughan, M.D.
Paper Title Page
An E-Beam Irradiation Beamline at Jefferson Lab for 1,4-Dioxane and Per- and Polyfluoroalkyl Substances Remediation in Wastewater  
  • X. Li, H. Baumgart
    ODU, Norfolk, Virginia, USA
  • G. Ciovati, M.D. McCaughan, M. Poelker, S. Wang
    JLab, Newport News, Virginia, USA
  • F.E. Hannon
    Phase Space Tech, Bjärred, Sweden
  Funding: Jefferson Lab Laboratory Directed Research and Development Program.
The Upgraded Injector Test Facility (UITF) at Jefferson Lab, providing a beam energy up to 10 MeV, is suitable for wastewater remediation research. To investigate the degradation of 1,4-dioxane and per- and polyfluoroalkyl substances (PFAS), widespread in wastewater and potential to be regulated in near future [1], a beamline for electron-beam irradiation has been designed, installed and successfully commissioned at the UITF. A solenoid with a peak axial magnetic field of up to 0.28 T and a raster were used to obtain a Gaussian beam profile with a transverse standard deviation of ~15 mm. It was applied to irradiate 1,4-dioxane sample filled in the target cell that was designed to let the entire sample receive significant irradiation doses. The dose distribution and absorbed dose, few studied in the existing publications, are necessary measures for the degradation mechanism investigation and have been innovatively achieved in this work using simulations, which were calibrated with opti-chromic dosimeter rods directly exposed to the electron beam. This approach provides an important way for investigating the environmental remediation impact of electron-beam irradiation.
[1] U.S. EPA. Announcement of preliminary regulatory determinations for
contaminants on the fourth drinking water contaminant candidate list. Federal register, 85(47):14098 - 14142, 2020.2.
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WEPA12 Operational Experience of the New Booster Cryomodule at the Upgraded Injector Test Facility 640
  • M.W. Bruker, R. Bachimanchi, J.M. Grames, M.D. McCaughan, J. Musson, P.D. Owen, T.E. Plawski, M. Poelker, T. Powers, H. Wang, Y.W. Wang
    JLab, Newport News, Virginia, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177.
Since the early 1990s, the injector of the CEBAF accelerator at Jefferson Lab has relied on a normal-conducting RF graded-beta capture section to boost the kinetic energy of the electron beam from 100 / 130 keV to 600 keV for subsequent acceleration using a cryomodule housing two superconducting 5-cell cavities similar to those used throughout the accelerator. To simplify the injector design and improve the beam quality, the normal-conducting RF capture section and the cryomodule will be replaced with a new single booster cryomodule employing a superconducting, β = 0.6, 2-cell-cavity capture section and a single, β = 0.97, 7-cell cavity. The Upgraded Injector Test Facility at Jefferson Lab is currently hosting the new cryomodule to evaluate its performance with beam before installation at CEBAF. While demonstrating satisfactory performance of the booster and good agreement with simulations, our beam test results also speak to limitations of accelerator operations in a noisy, thermally unregulated environment.
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DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA12  
About • Received ※ 03 August 2022 — Revised ※ 07 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 06 September 2022
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