Author: Murokh, A.Y.
Paper Title Page
MOPOB72 Update on CW 8 kW 1.5 GHz Klystron Replacement 232
 
  • A.V. Smirnov, S. Boucher
    RadiaBeam Systems, Santa Monica, California, USA
  • R.B. Agustsson, D.I. Gavryushkin, J.J. Hartzell, K.J. Hoyt, A.Y. Murokh, T.J. Villabona
    RadiaBeam, Santa Monica, California, USA
  • G.R. Branner, K.S. Yuk
    UC Davis, Davis, USA
  • V. Khodos
    Sierra Nevada Corporation, Irvine, USA
  
  Funding: This work was supported by the U.S. Department of Energy (award No. DE-SC0013136).
JLAB upgrade program requires a ~8 kW, 1497 MHz amplifier operating at more than 55-60% efficiency, and 8 kW CW power to replace up to 340 klystrons. One of possibilities for the klystron replacement is usage of high electron mobility packaged GaN transistors applied in array of highly efficient amplifiers using precise in-phase, low-loss combiners-dividers. Design features and challenges related to amplifier modules and radial multi-way dividers/combiners are discussed including HFSS simulations and measurements. 		 
poster icon Poster MOPOB72 [1.199 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-MOPOB72  
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TUPOA68 Design, Simulations and Experimental Demonstration of an Intra-Pulse Ramped-Energy Travelling Wave Linac for Cargo Inspection 421
 
  • S.V. Kutsaev, R.B. Agustsson, A. Arodzero, R.D.B. Berry, S. Boucher, Y.C. Chen, J.J. Hartzell, B.T. Jacobson, A. Laurich, A.Y. Murokh, E.A. Savin, A.Yu. Smirnov, A. Verma
    RadiaBeam, Santa Monica, California, USA
  
  Funding: This work has been supported by the US Department of Homeland Security, Domestic Nuclear Detection Office, under competitively awarded contract HSHQDC-13-C-B0019.
Novel radiographic imaging techniques [1] based on adaptive, intra-pulse ramped-energy short X-ray packets of pulses, a new type of fast X-ray detectors, and advanced image processing are currently some of the most promising methods for real-time cargo inspection systems. RadiaBeam Technologies is currently building the high-speed Adaptive Railroad Cargo Inspection System (ARCIS), which will enable better than 5 mm line pair resolution, penetration greater than 450 mm of steel equivalent, material discrimination over the range of 6 mm to 250 mm, 100% image sampling rate at speed 45 km/h, and minimal average dose. One of the core elements of ARCIS is a new S-band travelling wave linac with a wide range of energy control that allows energy ramping from 2 to 9 MeV within a single 16 μs RF pulse using the beam loading effect. In this paper, we will discuss the linac design approach and its principal components, as well as engineering and manufacturing aspects. The results of the experimental demonstration of intra-pulse energy ramping will be presented.
[1] A. Arodzero, S. Boucher, A. Murokh, S. Vinogradov, S.V. Kutsaev. System and Method for Adaptive X-ray Cargo Inspection. US Patent Application 2015/1472051. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUPOA68  
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WEPOB48 THz and Sub-THz Capabilities of a Table-Top Radiation Source Driven by an RF Thermionic Electron Gun 998
 
  • A.V. Smirnov, R.B. Agustsson, S. Boucher, T.J. Campese, Y.C. Chen, J.J. Hartzell, B.T. Jacobson, A.Y. Murokh, F.H. O'Shea, E. Spranza
    RadiaBeam, Santa Monica, California, USA
  • W. Berg, M. Borland, J.C. Dooling, L. Erwin, R.R. Lindberg, S.J. Pasky, N. Sereno, Y. Sun, A. Zholents
    ANL, Argonne, Illinois, USA
  • W. Bruns
    WBFB, Berlin, Germany
  • M.J. de Loos, S.B. van der Geer
    Pulsar Physics, Eindhoven, The Netherlands
  
  Funding: This work was supported by the U.S. Department of Energy (award No. DE-SC-FOA-0007702).
Design features and experimental results are presented for a sub-mm wave source [1] based on APS RF thermionic electron gun. The setup includes compact alpha-magnet, quadrupoles, sub-mm-wave radiators, and THz optics. The sub-THz radiator is a planar, oversized structure with gratings. Source upgrade for generation frequencies above 1 THz is discussed. The THz radiator will use a short-period undulator having 1 T field amplitude, ~20 cm length, and integrated with a low-loss oversized waveguide. Both radiators are integrated with a miniature horn antenna and a small ~90°-degree in-vacuum bending magnet. The electron beamline is designed to operate different modes including conversion to a flat beam interacting efficiently with the radiator. The source can be used for cancer diagnostics, surface defectoscopy, and non-destructive testing. Sub-THz experiment demonstrated a good potential of a robust, table-top system for generation of a narrow bandwidth THz radiation. This setup can be considered as a prototype of a compact, laser-free, flexible source capable of generation of long trains of Sub-THz and THz pulses with repetition rates not available with laser-driven sources.
[1] A. V. Smirnov, R. Agustsson, W. J. Berg et al., Phys. Rev. ST Accel. Beams 18, 090703(2015) 		 
poster icon Poster WEPOB48 [1.335 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOB48  
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THB3CO04
 Technology Development Toward High Duty Cycle Inverse Compton Scattering X-Ray Source  
WEPOB46   use link to see paper's listing under its alternate paper code  
 
  • A.Y. Murokh, R.B. Agustsson, T.J. Campese, A.G. Ovodenko
    RadiaBeam, Santa Monica, California, USA
  • M. Babzien, M.G. Fedurin, I. Pogorelsky, M.N. Polyanskiy, T.V. Shaftan, C. Swinson
    BNL, Upton, Long Island, New York, USA
  • J.B. Rosenzweig, Y. Sakai
    UCLA, Los Angeles, California, USA
  
  An important challenge in the development of practical X-ray sources based on Inverse Compton Scattering is the implementation of a reliable, increased-repetition-rate operation cycle. To this end, we report the first demonstration of an actively re-amplified CO2 laser intra-cavity ICS source, which matches the electron linac pulse structure at 40 MHz repetition rate. Multi-bunch interaction with 5- and 15-pulse trains was demonstrated, and near linear photon yield gain from multi-pulse interaction was demonstrated. The system shows noticeably higher operational reliability than several contemporary single shot systems, as well as a great potential for future scalability.  
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TUB3CO04 A New Thermionic RF Electron Gun for Synchrotron Light Sources 453
 
  • S.V. Kutsaev, A.Y. Murokh, E.A. Savin, A.Yu. Smirnov, A.V. Smirnov
    RadiaBeam Systems, Santa Monica, California, USA
  • R.B. Agustsson, J.J. Hartzell, A. Verma
    RadiaBeam, Santa Monica, California, USA
  • A. Nassiri, Y. Sun, G.J. Waldschmidt, A. Zholents
    ANL, Argonne, Illinois, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
  
  Funding: This work is supported by the U.S. Department of Energy, Office of Basic Energy Science, under contract DE-SC0015191 and contract No. DE-AC02-06CH11357.
A thermionic RF gun is a compact and efficient source of electrons used in many practical applications. RadiaBeam Systems and the Advanced Photon Source of Argonne National Laboratory collaborate in developing of a reliable and robust thermionic RF gun for synchrotron light sources which would offer substantial improvements over existing thermionic RF guns and allow stable operation with up to 1A of beam peak current at a 100 Hz pulse repetition rate and a 1.5 μs RF pulse length. In this paper, we discuss the electromagnetic and engineering design of the cavity, and report the progress towards high power tests of the cathode assembly of the new gun. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-TUB3CO04  
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