Author: Wang, S.
Paper Title Page
MOPA72 Preliminary Tests and Beam Dynamics Simulations of a Straight-Merger Beamline 206
  • A.A. Al Marzouk, P. Piot, T. Xu
    Northern Illinois University, DeKalb, Illinois, USA
  • S.V. Benson, K.E. Deitrick, J. Guo, A. Hutton, G.-T. Park, S. Wang
    JLab, Newport News, Virginia, USA
  • D.S. Doran, G. Ha, P. Piot, J.G. Power, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  • C.E. Mitchell, J. Qiang, R.D. Ryne
    LBNL, Berkeley, California, USA
  Funding: NSF award PHY-1549132 to Cornell University and NIU, U.S. DOE contract DE-AC02-06CH11357 with ANL and DE-AC05-06OR23177 with JLAB.
Beamlines capable of merging beams with different energies are critical to many applications related to advanced accelerator concepts and energy-recovery linacs (ERLs). In an ERL, a low-energy "fresh" bright bunch is generally injected into a superconducting linac for acceleration using the fields established by a decelerated "spent" beam traveling on the same axis. A straight-merger system composed of a selecting cavity with a superimposed dipole magnet was proposed and recently test at AWA. This paper reports on the experimental results obtained so far along with detailed beam dynamics investigations of the merger concept and its ability to conserve the beam brightness associated with the fresh bunch.
poster icon Poster MOPA72 [1.659 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA72  
About • Received ※ 11 August 2022 — Accepted ※ 13 August 2022 — Issue date ※ 02 October 2022  
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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.
slides icon Slides TUXD2 [2.988 MB]  
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