Author: Murokh, A.Y.
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MOZBA3 Strongly Tapered Helical Undulator System for TESSA-266 63
TUPLH14   use link to see paper's listing under its alternate paper code  
  • T.J. Campese, R.B. Agustsson, I.I. Gadjev, A.Y. Murokh
    RadiaBeam, Marina del Rey, California, USA
  • W. Berg, A. Zholents
    ANL, Lemont, Illinois, USA
  • P.E. Denham, P. Musumeci, Y. Park
    UCLA, Los Angeles, USA
  Funding: DOE SBIR Award No. DE-SC0017102
RadiaBeam, in collaboration with UCLA and Argonne National Laboratory (ANL), is developing a strongly tapered helical undulator system for the Tapering Enhanced Stimulated Superradiant Amplification experiment at 266 nm (TESSA-266). The experiment will be carried out at the APS LEA facility at ANL and aims at the demonstration of very high energy conversion efficiency in the UV. The undulator system was designed by UCLA, engineered by RadiaBeam, and is presently in fabrication at RadiaBeam. The design is based on a permanent magnet Halbach scheme and includes a short 30 cm long buncher section and four 1 m long undulator sections. The undulator period is fixed at 32 mm and the magnetic field amplitude can be tapered by tuning the gap along the interaction. Each magnet can be individually adjusted by 1.03 mm, offering up to 25% magnetic field tunability with a minimum gap of 5.58 mm. A custom designed 316L stainless steel beampipe runs through the center with a clear aperture of 4.5 mm. This paper discusses the design and engineering of the undulator system, fabrication status, and plans for magnetic measurements, and tuning.
slides icon Slides MOZBA3 [8.942 MB]  
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About • paper received ※ 27 August 2019       paper accepted ※ 31 August 2019       issue date ※ 08 October 2019  
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THYBA5 Study of Fluctuations in Undulator Radiation in the IOTA Ring at Fermilab 934
SUPLH03   use link to see paper's listing under its alternate paper code  
TUPLH13   use link to see paper's listing under its alternate paper code  
  • I. Lobach
    University of Chicago, Chicago, Illinois, USA
  • A. Halavanau, Z. Huang, V. Yakimenko
    SLAC, Menlo Park, California, USA
  • K. Kim
    ANL, Lemont, Illinois, USA
  • V.A. Lebedev, S. Nagaitsev, A.L. Romanov, G. Stancari
    Fermilab, Batavia, Illinois, USA
  • A.Y. Murokh
    RadiaBeam, Marina del Rey, California, USA
  • T.V. Shaftan
    BNL, Upton, New York, USA
  We study turn-by-turn fluctuations in the number of emitted photons in an undulator, installed in the IOTA electron storage ring at Fermilab, with an InGaAs PIN photodiode and an integrating circuit. In this paper, we present a theoretical model for the experimental data from previous similar experiments and in our present experiment, we attempt to verify the model in an independent and a more systematic way. Moreover, in our experiment we consider the regime of very small fluctuation when the contribution from the photon shot noise is significant, whereas we believe it was negligible in the previous experiments. Accordingly, we present certain critical improvements in the experimental setup that let us measure such a small fluctuation.  
slides icon Slides THYBA5 [8.048 MB]  
poster icon Poster THYBA5 [3.079 MB]  
DOI • reference for this paper ※  
About • paper received ※ 24 August 2019       paper accepted ※ 05 September 2019       issue date ※ 08 October 2019  
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Additive Manufacturing of Electrical and Thermal Devices: Challenges and Opportunities  
  • P.R. Carriere, P. Frigola, A.Y. Murokh
    RadiaBeam, Santa Monica, California, USA
  • D. Gamzina
    SLAC, Menlo Park, California, USA
  • T. Horn
    NCSU, Raleigh, North Carolina, USA
  Metal-based, powder-bed additive manufacturing represents the convergence of three mature technologies: powder metallurgy, digital controls and high-power electron or laser beam optics. The aero, defense and medical industries have significantly benefited from this rapidly-evolving ecosystem, as it offers expanded design opportunities, part consolidation and reduced lead times. These applications are generally structural, utilizing titanium, aluminum, nickel or iron based alloys. Oxygen-free copper represents a significantly more challenging material because it’s intrinsic properties ( i.e. thermal conductivity) as well as the purity requirements of the final part. Furthermore, accelerator components are based on internal features, which complicated downstream processing. In this presentation, the general AM industry status will be reviewed, highlighting the successful use-cases from other industries. The challenges of printing in Cu will be described from a fundamentals perspective. Finally, the current status of Cu printing will be described, highlighting current progress and areas of future investigation.  
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Nanosecond RF Power Switch for Gyrotron-Driven Millimeter-Wave Accelerators  
  • S.V. Kutsaev, J. Condori, B.T. Jacobson, M. Ruelas, A.Yu. Smirnov
    RadiaBeam, Santa Monica, California, USA
  • V.A. Dolgashev, B.T. Jacobson, E.A. Nanni
    SLAC, Menlo Park, California, USA
  • A.Y. Murokh
    RadiaBeam Systems, Santa Monica, California, USA
  • J.F. Picard
    MIT/PSFC, Cambridge, Massachusetts, USA
  • S.C. Schaub
    MIT, Cambridge, Massachusetts, USA
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under SBIR DE-SC0013684.
The development of novel mm-wave accelerating structures with > 200 MV/m gradients offers a promising path to reduce the cost and footprint of future TeV-scale linear colliders, as well as linacs for industrial, medical and security applications. The major factor limiting accelerating gradient is vacuum RF breakdown. The probability of such breakdowns increases with pulse length. For reliable operation, millimeter-wave structures require nanoseconds long pulses at the megawatt level. This power is available from gyrotrons, which have a minimum pulse length on the order of microseconds. In this paper, we will describe the laser-based RF switch capable of selecting 10 ns long pulses out of the microseconds long gyrotron pulses, thus enabling the use of the gyrotrons as power sources for mm-wave high gradient linac. The principle of operation of this device and its achieved parameters will be discussed. We will also report on the experimental demonstration of the RF switch with the high power gyrotron at the Massachusetts Institute of Technology.
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