WEZD —  Accelerator Technology   (10-Aug-22   14:00—16:00)
Chair: M.S. Curtin, Ion Linac Systems, Inc., Albuquerque, USA
Paper Title Page
WEZD1 ARDAP’s Perspective on Accelerator Technology R&D in the U.S. 592
  • B.E. Carlsten, E.R. Colby, R.A. Marsh, M. White
    ARDAP, Washington, USA
  DOE operates several particle accelerator facilities and is planning several new forward-leaning accelerator facilities over the next decade or two. These new facilities will focus on discovery science research and fulfilling other core DOE missions. Near and mid-term examples include PIP-II and FACET-II (for High Energy Physics); LCLS-II, SNS-PPU, APS-U, and ALS-U (for Basic Energy Sciences); FRIB (for Nuclear Physics); NSTX-U and MPEX (for Fusion Energy Sciences); and Scorpius (for NNSA). Longer-term examples may include future colliders, the SNS-STS, LCLS-II HE, and EIC. In addition to domestic facilities, DOE’s Office of Science (SC) also contributes to several international efforts. Together, these new facilities constitute a multibillion-dollar construction and operations investment. To be successful, they will require advances in state-of-the-art accelerator technologies. They will also require the National Laboratories to procure a variety of accelerator components. This paper summarizes how DOE is working to address these upcoming R&D and accelerator component production needs through its new office of Accelerator R&D and Production (ARDAP).  
slides icon Slides WEZD1 [2.310 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEZD1  
About • Received ※ 05 August 2022 — Revised ※ 09 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 19 August 2022
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Solid State Active Reset Induction Technology to Accelerate kA Electron Beam  
  • J. Ellsworth
    LLNL, Livermore, USA
  We will discuss Solid State Active reset technology and how it can be applied to kA electron beams.  
slides icon Slides WEZD2 [2.871 MB]  
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WEZD3 Magnetron R&D Progress for High Efficiency CW RF Sources of Industrial Accelerators 597
  • H. Wang, K. Jordan, R.M. Nelson, S.A. Overstreet, R.A. Rimmer
    JLab, Newport News, Virginia, USA
  • J.N. Blum
    VCU, Richmond, Virginia, USA
  • B.R.L. Coriton, C.P. Moeller, K.A. Thackston
    GA, San Diego, California, USA
  • J.L. Vega
    The College of William and Mary, Williamsburg, Virginia, USA
  • G. Ziemyte
    UKY, Kentucky, USA
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177, and DOE OS/HEP Accelerator Stewardship award 2019-2022.
After the demonstration of using high efficiency magnetron power to combine and aim to drive a radio frequency accelerator at 2450MHz in CW mode [1], we have used trim coils adding to a water-cooled magnetron and three amplitude modulation methods in an open-loop control to further suppress the 120Hz side-band noise to -46.7dBc level. We have also successfully demonstrated the phase-locking to an industrial grade cooking magnetron transmitter at 915MHz with a 75kW CW power delivered to a water load by using a -26.6dBc injection signal. The sideband noise at 360Hz from the 3-Phase SCRs DC power supply can be reduced to -16.2dBc level. Their power combing scheme and higher power application to industrial accelerators are foreseeing.
[1] H. Wang, et al, Magnetron R&D for High Efficiency CW RF Sources for Industrial Accelerators, TUPAB348, 12th Int. Particle Acc. Conf. IPAC2021, Campinas, SP, Brazil.
slides icon Slides WEZD3 [3.074 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEZD3  
About • Received ※ 18 July 2022 — Revised ※ 25 July 2022 — Accepted ※ 08 August 2022 — Issue date ※ 11 August 2022
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Using Off-Axis Undulator Radiation as a Longitudinal Electron-Beam Diagnostic  
  • Q.R. Marksteiner, H.L. Andrews, J.E. Coleman, W.P. Romero, N.A. Yampolsky, M.R.A. Zuboraj
    LANL, Los Alamos, New Mexico, USA
  • S.K. Barber, R.D. Ryne, J. van Tilborg
    LBNL, Berkeley, USA
  • C. Emma
    SLAC, Menlo Park, California, USA
  • B. Ostler
    University of Chicago, Chicago, Illinois, USA
  Funding: This project was supported by funding from the Los Alamos National Laboratory Laboratory Research and Development program.
A novel diagnostic has been developed that uses off-axis undulator radiation to characterize the longitudinal bunch profile of an electron beam. The diagnostic uses a small, ~0.1-m long undulator with mirrors that focus the undulator radiation onto an array of pyrometers. The mirrors both focus the radiation onto the pyrometer and remove the chirping effect that comes from the finite length of the undulator. Numerical and analytical models have been developed to calculate the radiation for a given bunch length, and a phase retrieval algorithm has been developed to extract the bunch profile from measured data. The diagnostic has been installed at the BELLA laser-plasma wakefield accelerator, and will be used to characterize the bunch length there. The concept and relevant results will be presented.
slides icon Slides WEZD4 [3.577 MB]  
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Micro-Electromechanical Systems Based Multi-Beam Ion Accelerators  
  • Q. Ji, A. Amsellem, A. Persaud, Z. Qin, T. Schenkel, P.A. Seidl, N. Valverde
    LBNL, Berkeley, California, USA
  • K. Afridi, V. Gund, Y. Hou, A. Lal, D. Ni
    Cornell University, Ithaca, New York, USA
  • S.M. Lund
    FRIB, East Lansing, Michigan, USA
  Funding: This work was funded by ARPA-E. Work at LBNL was conducted under DOE Contract DE-AC0205CH11231. Device fabrication at the Cornell Nano Fabrication facility is supported by NSF Grant No. ECCS-1542081.
We report on the development of multi-beam radio frequency (RF) linear ion accelerators that are formed from stacks of low-cost printed circuit boards. An array of 112 beamlets is formed using MEMS techniques in 4" wafers. The peak argon ion current accelerated in the 112-beamlet column to date is 0.5 mA [1]. We have accelerated ions in stacks of 32 wafers to an energy of 100 keV. The measured energy gain in each RF gap reached 6.5 keV on average, resulting in an effective acceleration gradient of 0.4 MV/m. We will describe how this approach to multi-beam RF ion acceleration can scale to high beam power for applications in material processing and nuclear materials development.
[1] Qing Ji, et al., "Beam power scale-up in micro-electromechanical systems based multi-beam ion accelerators", Rev. Sci. Instr. 92, 103301 (2021); https://doi.org/10.1063/5.0058175
slides icon Slides WEZD5 [4.575 MB]  
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WEZD6 Manufacturing the Harmonic Kicker Cavity Prototype for the Electron-Ion Collider 601
  • S.A. Overstreet, M.W. Bruker, G.A. Grose, J. Guo, J. Henry, G.-T. Park, R.A. Rimmer, H. Wang, R.S. Williams
    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
High-bunch-frequency beam-separation schemes, such as the injection scheme proposed for the Rapid Cycling Synchrotron at the Electron-Ion Collider, demand rise and fall times an order of magnitude below what can realistically be accomplished with a stripline kicker. Nanosecond-time-scale kick waveforms can instead be obtained by Fourier synthesis in a harmonically resonant quarter-wave radio-frequency cavity which is optimized for high shunt impedance. Originally developed for the Jefferson Lab Electron-Ion Collider (JLEIC) Circulator Cooler Ring, a hypothetical 11-pass ring driven by an energy-recovery linac at Jefferson Lab, our high-power prototype of such a harmonic kicker cavity, which operates at five modes at the same time, will demonstrate the viability of this concept with a beam test at Jefferson Lab. As the geometry of the cavity, tight mechanical tolerances, and number of ports complicate the design and manufacturing process, special care must be given to the order of the manufacturing steps. We present our experiences with the manufacturability of the present design, lessons learned, and first RF test results from the prototype.
slides icon Slides WEZD6 [12.312 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEZD6  
About • Received ※ 04 August 2022 — Revised ※ 05 August 2022 — Accepted ※ 18 August 2022 — Issue date ※ 31 August 2022
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