233 GHz ultra-wide band TWTA: PPM Integrated sheet electron beam transport and PIC analysis

We report on the design and development of a PPM integrated 233 GHz staggered vane sheet beam TWTA [1, 2]. The permanent magnetic (NdFeB) based focusing lens structure for the sheet electron beam transport has been designed for a gun operated at 19 kV. For a beam tunnel of 830 μm * 160 μm, a transmitted current of ~ 200 mA is achieved for > 40 mm length channel. For 19 kV operation, the TWTA circuit has been re-designed. The EM/PIC simulation analysis predicts ~ 40 GHz cold band width and ~ 20 GHz hot bandwidth for a power gain of > 25 dB. The PCM based transmission results, TWT circuit cold test, and the pulsed proof of concept hot test status will be presented in the conference.