A Resonantly Coupled, Ferrite-Tuned Buncher-Cavity System for the Los Alamos Proton Storage Ring
Resonantly coupled buncher and ferrite-loaded tuning cavities at 503.125 MHz are separately optimized to provide fast tracking of time-dependent beam current changes in the Los Alamos Proton Storage Ring (PSR) while maximizing radio-frequency (rf) stability and efficiency.
Magnetic Tuning of Resonant Cavities and Wideband Frequency Modulation of Klystrons
General expressions are obtained for the perturbation of transmission cavities at microwave frequencies by the magnetic properties of ferrites. Experimental results are given for a number of ferrite slabs and magnetic field orientations. The frequency shift of the cavities is given for the range of magnetic field strength from 0 to 1,000 oersteds and slab thicknesses of 0.010 to 0.100 inch. The microwave permeability of a ferrite in the direction of the applied magnetic field is also determined. Two magnetically-tuned x-band klystrons are described for applications requiring very wide-band frequency modulation with low amplitude modulation. Linear frequency deviations as large as 240 mc are obtained with only 13 per cent change in amplitude. This deviation can be extended by proper magnet design.
Energy skin effect of propellant particles in Electrothermal-Chemical Launcher
A numerical model of the radiation has been employed by a Monte Carlo method and statistical physics to simulate the process of a capillary plasma source for Electrothermal-Chemical (ETC) Launcher. The effect on propellants with different physical parameters is discussed. The plasma-propellant interaction is also discussed when combined with a thermal model. Results show that radiant energy only causes a small field around the plasma injector in the propellant bed. The responses of energy flux and propellant particles on radiation are both in the order of picosecond. The strong instantaneous radiation is responsible for the transmission of energy to the propellant particles leading to ignition. Compared with conventional ignition, the energy absorbed by propellant particles is used to increase quickly the temperature in the surface layer of propellant particles. This energy skin effect in the propellant particle surface appears to be the main cause of plasma ignition.