Conductivity ratios have been measured in weakly ionized afterglows of repetitively pulsed, electrodeless, rf discharges in helium, neon, krypton, and xenon using a microwave resonant cavity (2.7 GHz). Maxwellian electron-energy distributions were obtained at temperatures from 300°K to 10 000°K, as measured with a gated microwave radiometer (4 GHz), Momentumtransfer cross sections for electrons of energy up to 2 eV in neon, krypton, and xenon were determined from the measured conductivity ratios by an iterative procedure. The results in helium support the momentum-transfer cross section determined from the electron-beam experiments of Golden and Bandel. Those for neon indicate a scattering length of + O.2O« 0 . The momentum-transfer cross sections for krypton and xenon agree best with, but are generally lower than, those of Frost and Phelps and indicate a deeper (approximately 2.5 times) Ramsauer minimum. An experimental check of the theoretical electron-ion collision frequency for highfrequency, low-temperature conditions has been made. 1 1 FROST \ \\ \K v\ \ \ J L.
A Tesla transformer similar to that suggested for transformer−type pulsed accelerators is described. The theory is outlined and computational results presented for representative losses under various conditions of tuning and coupling. The behaviour of an experimental transformer housed in an SF6−filled pressure vessel is discussed. The device has a tuning ratio of 1.1, a voltage coefficient of 0.85, and a coupling coefficient of 0.37. The influence of eddy currents induced in the pressure vessel wall on the coupling coefficient and tuning ratio is noted. The particular transformer described can provide a 2.5 MV peak at the third half cycle of the secondary output voltage.
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