Author: Ruelas, M.
Paper Title Page
TUPOW054 Characterization of a Sub-THz Radiation Source Based on a 3 MeV Electron Beam and Future Plans 1892
 
  • A.V. Smirnov, R.B. Agustsson, T.J. Campese, Y.C. Chen, J.J. Hartzell, B.T. Jacobson, A.Y. Murokh, M. Ruelas
    RadiaBeam, Santa Monica, California, USA
  • W. Berg, J.C. Dooling, L. Erwin, R.R. Lindberg, S.J. Pasky, N. Sereno, Y.-E. Sun, A. Zholents
    ANL, Argonne, Ilinois, USA
  • Y. Kim
    KAERI, Jeongeup-si, Republic of Korea
  
  Funding: This work was supported by the U.S. Department of Energy (award No. DE-SC-FOA-0007702)
Design features and some past experimental results are presented for a sub-THz wave source employing the Advanced Photon Source's RF thermionic electron gun. The setup includes a compact alpha-magnet, four quadrupoles, a novel radiator, a THz transport line, and THz diagnostics. The radiator is composed of a dielectric-free, planar, over-sized structure with gratings. The gratings are integrated into a combined horn antenna and ~90° permanent bending magnet. The magnetic lattice enables operation in different modes, including conversion to a flat beam for efficient interaction with the radiating structure. The experiment described demonstrated the generation of narrow bandwidth THz radiation from a compact, laser and undulator-free, table-top system. This concept could be scaled to create a THz-sub-THz source capable of operating in long-pulse, multi-bunch, and CW modes. Additionally, the system can be used to remove unwanted time-dependent energy variations in longitudinally compressed electron bunches or for various time-dependent beam diagnostics. Plans for future experiments and upgrades are also discussed. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW054  
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MOPMR056 Single-shot THz Spectrometer for Measurement of RF Breakdown in mm-wave Accelerators 374
 
  • S.V. Kutsaev, A.Y. Murokh, M. Ruelas, E.A. Savin, H.L. To
    RadiaBeam Systems, Santa Monica, California, USA
  • M. Dal Forno, V.A. Dolgashev
    SLAC, Menlo Park, California, USA
  • V. Goncharik
    Logicware Inc, New York, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under contract DE-SC0013684
We present a new instrument designed to detect RF pulse shortening caused by vacuum RF breakdown in mm-wave particle accelerators. RF breakdown limits the performance of high gradient RF accelerators. To understand the properties of these breakdowns, it is necessary to have diagnostics that reliably detect RF breakdowns. In X-band or S-band accelerators, RF breakdowns are detected by measuring RF pulse shortening, vacuum burst, or, if current monitors are available, spikes in the field-emitted currents. In mm-wave accelerators, all of these methods are difficult to use. In our experiments, we could not measure RF pulse shortening directly with a crystal detector because the RF pulse is very short'just a few nanoseconds'and changes in the measured signal were masked by RF amplitude jitter. To overcome this limitation, we built a single-shot spectrometer with a frequency range of 117-125 GHz and a resolution of 0.1 GHz. The spectrometer should be able to measure the widening of the spectrum caused by the shortening of nanosecond-long pulses. We present design considerations, first experimental results obtained at FACET, and planned future improvements for the spectrometer. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR056  
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MOPOW044 Commissioning of the RadiaBeam / SLAC Dechirper 809
 
  • M.W. Guetg, K.L.F. Bane, A. Brachmann, A.S. Fisher, Z. Huang, R.H. Iverson, P. Krejcik, A.A. Lutman, T.J. Maxwell, A. Novokhatski, G. Stupakov, J. Zemella, Z. Zhang
    SLAC, Menlo Park, California, USA
  • M.A. Harrison, M. Ruelas
    RadiaBeam Systems, Santa Monica, California, USA
  • J. Zemella
    DESY, Hamburg, Germany
  • Z. Zhang
    TUB, Beijing, People's Republic of China
  
  We present results on the commissioning of the two-module RadiaBeam / SLAC dechirper system at LCLS. This is the first installation and measurement of a corrugated dechirper at high energy (4.4 - 13.3 GeV), short pulses (< 200 fs) and while observing its effect on an operational FEL. Both the transverse and longitudinal wakefields allow more flexible electron beam tailoring. We verify that, for a single module at a given gap, the strength of the longitudinal wake on axis and the dipole near the axis agree well with the theoretical values. Using direct longitudinal phase space mapping and X-ray FEL spectrum measurements we demonstrate the energy chirp control capabilities.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW044  
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MOPOW049 Implementation of a Corrugated-Plate Dechirping System for GeV Electron Beam at LCLS 824
 
  • M.A. Harrison, P. Frigola, J.D. McNevin, A.Y. Murokh, M. Ruelas
    RadiaBeam Systems, Santa Monica, California, USA
  • A.M. Babbitt, M. Carrasco, A. Cedillos, R.H. Iverson, P. Krejcik, T.J. Maxwell, Ž. Oven
    SLAC, Menlo Park, California, USA
  
  Funding: This work is supported by US DOE Grant No. DE-SC0009550.
A new corrugated-plate Dechirper was recently installed in the LCLS and underwent commissioning tests to gauge its efficacy in shaping the longitudinal phase space of bunches entering the FEL. Here, we describe in detail the completed four-meter LCLS Dechirper system along with a narrative of its construction. We detail the various challenges and lessons learned in the manufacturing and assembly of this first-of-its-kind device. An outlook on future designs is presented. 		 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOW049  
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