Abstract
Summary form only given, as follows. Gyrotron devices utilizing rectangular interaction waveguide are currently being investigated. Some current issues under investigation include the control of polarization, and power versus pulselength of microwave emission. Annular long-pulse electron beams are generated by the Michigan Electron Long Beam Accelerator (MELBA) at parameters: electron beam voltage of 750 kV, injected current of 1-3 kA, and /spl tau/=0.5-1.0 /spl mu/s. Initial experimental results of polarized microwave radiation from a rectangular cross-section (RCS) gyrotron will be presented for small-orbit electron beams. Frequency measurements and annular e-beam generation and transport experimental results will be presented. Simulations using the E-gun code and MAGIC code will be presented.
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