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Design and results of experimental tests of a high-power sub-terahertz gyrotron with a pulse solenoid for remote detection of radioactive materials are presented. Operating frequency corresponds to the atmospheric transparency window (0.66–0.67 THz). The 200 kW output power in pulses up to 30 microsecond duration were obtained.
The International Linear Collider (ILC) requires a 1.3 GHz RF source with a minimum efficiency of 65% at 10 MW output power, and a cathode current density of less than 5 A/cm2. In addition, the source must be compatible with a pulse width of 1.5 milliseconds at a repetition rate of 15 Hz. Present source development is centered on multiple beam (MBK) and sheet beam (SBK) klystrons. These devices are...
We are studying new concepts for remote detection of concealed radioactive materials.1–3 The research is a balanced effort consisting of theory, simulations and experiments.
Summary form only given. The project's purpose is to design a microwave source of 670 GHz range radiation with enough power to cause breakdown in the air. The device in question will be a gyrotron oscillator and part of the challenge is designing an interaction cavity for this device.In line with successful experiments with a 170 GHz gyrotron1, the TE318 was chosen as the operation mode. The proposed...
We present initial results of testing of a pulse gyrotron to produce powers up to 10 kW peak and 10 W average at frequencies from 600 GHz to 2 THz. The gyrotron uses a pulse magnet to generate fields to 40 Tesla.
We present results of modelling and details of fabrication of a pulse gyrotron to produce powers up to 10 kW peak and 10 W average at frequencies from 600 GHz to 2 THz. The gyrotron uses a pulse magnet that generates fields to 40 Tesla.
Summary form only given. The goal of producing THz radiation from miniature electron beam devices has refocused interest in orotrons. Here we consider planar orotrons driven by electron beams produced by carbon nanotube cathodes. The efficiency of these devices improves with increasing current density. However, with increasing current density, self-fields become more important. Here, the theory of...
Calabazas Creek Research, Inc. has a program to develop a gyrotron producing up to 5 kW pulse power at various frequencies from about 600 GHz to 2 THz. The operating mode at 1 THz is TE15.4. The magnetic field is 37.6 Tesla. This is provided by a pulse magnet designed to operate repetitively, with a pulse repetition frequency of about 10 Hz. By reducing the magnetic field, lower order modes can be...
Plasma-assisted slow-wave oscillators (pasotrons) are unique sources of microwave radiation, in which beam propagation in the absence of external magnetic fields is provided by ion focusing and the electron interaction with the RF field is essentially two-dimensional
Summary form only given. The development of compact terahertz sources capable of output powers and efficiencies greater than 100 mW and 5%, respectively, will require electron beams of high current density (>50 A/cm2) and very small dimensions (~100 micron-scale). Generating such dense beams using thermionic emitters necessitates compressing the beam by about a factor of 10 which may negatively...
Summary form only given. The plasma-assisted slow-wave oscillator (pasotron) was first developed at Hughes electron dynamics to meet the need for mobile microwave sources capable of generating high pulse energies. The gun plasma provides a source of electrons for generating high-current electron beams and ions for neutralizing space charge forces on the beam. By controlling the density and extent...
80 MW Ku-band gyroklytrons are being developed with pulse duration of one microsecond for driving future linear colliders. Three- and four-cavity coaxial schemes are presented in this paper. Numerical simulations predict efficiency over 32%, with 50–60dB gain, and 80 MW power level for gyroklystrons operating at second harmonic (17.136GHz). It is shown that a four-cavity circuit could improve significantly...
A linear and nonlinear, time dependent self-consistent theory for relativistic backward wave oscillator is developed. In this theory the transverse motion of the electrons is taken into account. Analytical and numerical analysis of the model equations near the cyclotron resonance gives a good estimate for the power drop due to the cyclotron absorption observed in many experiments and predicts an increase...
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