A W-band extended interaction klystron (EIK) driven by a 19.5-kV, 3.5-A sheet beam is being developed. Simulations using the 3-D particle-in-cell codes MAGIC1 and ICEPIC2 predict saturated output power levels of 8–10 kW with a saturated gain <30 dB and small signal gain <40 dB. A beamstick has been successfully fabricated and tested, transporting 98% of the emitted current through a 0.4-mm × 5-mm × 20-mm-long beam tunnel.3 Performance of the beamstick was in excellent agreement with MICHELLE4 simulations.
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