Design of W-band sheet beam Extended Interaction Klystron for millimeter-wave appplications
In this paper, the design of sheet-beam Extended Interaction Klystron (SBEIK) is discussed. The SBEIK is initially designed by implementing the preliminary equations and then modelled using CST-Microwave Studio (MWS) to obtain the dispersion characteristics by the Eigen-mode solver. The coupler design is carried out with stepped impedance transformer approach and is optimised to get a return loss of −54 dB. Particle-in-cell (PIC) simulation is carried out in CST-PIC solver indicated an RF output power of 7 kW and a gain of 28.4 dB.
Sheet-Beam 90 GHz and 220 GHz Extend-Interaction-Klystron Designs
Circuit designs for 91 GHz and 220-GHz sheet-beam extended-interaction klystrons (EIKs) are presented. The W-band circuit employs a relatively simple two-cavity configuration to demonstrate beam transport and high peak power RF generation, which will serve as the basis for future scaling to higher gain and frequencies. Uniform (solenoidal) magnetic focusing is employed in both cases. Simulations with MAGIC-3D indicate peak RF powers of 10.5 kW and >400 W are feasible with a 3 A, 19.5 kV beam and a 0.5 A, 16.5 kV beam at 91 GHz and 220 GHz, respectively. Proof of principle experimental demonstrations are planned.
Kinemamtic analysis of flying-saw vehicle
The paper analyzes the kinematic motion of the flying-saw vehicle.After the analysis,it is concluded that the ac- celerating periods and decelerating periods in both forward and backward directions will follow sin~2αcurve and,in order to increase the sawing dimensional accuracy,flying-saw vehicle must come back as soon as possible while acceleration remains constant.Based on this premise,the paper gives out the equations of kinematic motion of the flying-saw vehicle in every sta- ges and one example result in a common situation.By now this method has been used in the real situation.