Author: Kutsaev, S.V.
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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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TUPOY041 A Metal-Dielectric Micro-Linac for Radiography Source Replacement 1992
  • A.V. Smirnov, S. Boucher, S.V. Kutsaev
    RadiaBeam Systems, Santa Monica, California, USA
  • R.B. Agustsson, R.D.B. Berry, J.J. Hartzell, J. McNevin, A.Y. Murokh
    RadiaBeam, Santa Monica, California, USA
  • G. Leyh
    LOD, Brisbane, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
  Funding: * US Department of Energy Contract # DE-SC0011370
To improve public security and prevent the diversion of radioactive material for Radiation Dispersion Devices, RadiaBeam is developing an inexpensive, portable, easy-to-manufacture linac structure to allow effective capture of a ~13 keV electron beam injected from a conventional electron gun and acceleration to a final energy of ~ 1 MeV. The bremsstrahlung X-rays produced by the electron beam on a high-Z converter at the end of the linac will match the penetration and dose rate of a typical ~100 Ci or more Ir-192 source. The tubular Disk-and-Ring structure under development consists of metal and dielectric elements that reduce or even eliminate multi-cell, multi-step brazing. This may allow significant simplification of the fabrication process to enable inexpensive mass-production required for replacement of the ~55,000 radionuclide sources in the US
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY041  
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