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.
Parameters for low energy operation of CESR
We present a detailed design for operation of the Cornell Electron Storage Ring, CESR, in the energy range covering the /spl psi/ resonances and the Charm and Tau thresholds, as well as reaching to the upper Y resonances near 11 GeV. The addition of 18 m of super-ferric wiggler magnets will partially restore low energy beam emittance and damping times. Installation of superconducting quadrupoles in the interaction region and the addition of high performance superconducting RF cavities will enhance performance at all energies. Studies of optics, beam dynamics, wiggler and vacuum system performance, beam stability, and beam-beam effects confirm operation with a luminosity of 3/spl times/ 10/sup 32/ CM/sup -2/ sec/sup -1/ at 1.88 GeV.