Browsing Citations Only by Author "Granatstein, V."

Now showing items 1-8 of 8

    • Enhancement of overall efficiency in large-orbit gyrotrons 

      Singh, A.; Destler, William; Granatstein, V.; Hix, W. (Taylor and Francis, 1990)
      Energy recovery from the spent beam in gyrotrons can enhance their overall efficiency. A technique for converting the rotational motion in the spent beam of a large-orbit gyrotron into axial motion, before leading it ...

    • Experimental demonstration of an electromagnetically pumped free-electron laser with a cyclotron-harmonic idler 

      Kehs, R.; Carmel, Y.; Granatstein, V.; Destler, William (American Physical Society, 1988)
      A three-wave, free-electron laser was operated with a powerful 8.4-GHz electromagnetic "pump" wave replacing the usual magnetostatic wiggler. The presence of a uniform axial magnetic field Bo produced cyclotron-harmonic ...

    • First operation of a 94 GHz, sheet beam, FEL amplifier 

      Zhang, Ze-Xiang; Granatstein, V.; Destler, William; Levush, B.; Antonsen, T.; Rodgers, J.; Cheng, S. (Elsevier, 2002-10-14)
      Millimeter wave (94 GHz) amplification has been observed in the sheet beam, planar wiggler, free electron laser. Using a 4 A sheet beam (20 mm × 1.0 mm) at an electron energy of 530 keV, injected wave power of 5 W was ...

    • A High-average power tapered FEL amplifier at submillimeter frequencies using sheet electron beams and short-period wigglers 

      Bidwell, S.; Radack, D.; Antonsen, T.; Booske, J.; Carmel, Y.; Destler, William; Granatstein, V.; Levush, B.; Lathem, P.; Zhang, Z. (Elsevier, 1990-09-17)
      A high-average-power FEL amplifier operating at submillimeter frequencies is under development at the University of Maryland. Program goals are to produce a CW, ~ 1 MW, FEL amplifier source at frequencies between 280 GHz ...

    • Near-millimeter free electron lasers with small period wigglers and sheet electron beams 

      Granatstein, V.; Antonsen, T.; Booske, J.; Destler, William; Latham, P.; Levush, B.; Mayergoyz, I.; Radack, D.; Segalov, Z.; Serbeto, A. (Elsevier, 1988-10)
      Electron cyclotron resonance heating (ECRH) of plasmas in magnetic fusion research and space-borne radar systems are both projected to require high power radiation sources at wavelength λ not, vert, similar 1 mm. For ECRH, ...

    • New modes in a plasma with periodic boundaries: the origin of the dense spectrum 

      Lou, W.; Carmel, Y.; Antonsen, T.; Destler, William; Granatstein, V. (The American Physical Society, 1991-10-28)
      We analyze the new features of the low-frequency (£0 < £Op) modes of wave propagation in a plasma filled, spatially periodic structure. The spectrum of these modes is drastically modified by the periodic boundaries in a ...

    • Non-adiabatic transition of beams in gyrotrons through various magnetic field profiles 

      Singh, A.; Granatstein, V.; Casey, C.; Destler, William (Taylor & Francis, 1991)
      The achievement of efficiency enhancement in small-orbit gyrotrons by using depressed collector techniques requires precisely configured magnetic field profiles which present adiabatic as well as non-adiabatic transitions ...

    • Plasma influence on the dispersion properties of finite-length, corrugated waveguides 

      Shkvarunets, A.; Kobayashi, S.; Weaver, J.; Carmel, Y.; Rodgers, J.; Antonsen, T.; Granatstein, V.; Destler, William; Ogura, K.; Minami, K. (The American Physical Society, 1996-03)
      We present an experimental study of the electromagnetic properties of transverse magnetic modes in a corrugated-wall cavity filled with a radially inhomogeneous plasma. The shifts of the .resonant frequencies of a ...