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The paper is devoted to progress in development and application of the JINR-IAP FEM. This Bragg FEM generates 30 GHz pulses of up to 200 ns duration and 20–30 MW power with an efficiency on the level of ∼25 %. Frequency tuning in the range of 6 % with a precision of about 0.1 % was realized by mechanical variation of the distance between the Bragg reflectors. A test facility to study surface heating...
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