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Extra info for Advances in Electronics and Electron Physics, Vol. 35
I m apart along the discharge tube. The widths and effective 42 RICHARD G. FOWLER heights of the slots were adjusted to insure signals of near constant amplitude for accurate velocity measurements. The wave-speed data were plotted as a function of distance and the results for waves of both polarities appear in Figs. 37 and 38. The attenuation that is a well-known characteristic of breakdown waves (23,25) is clearly visible. Blais and Fowler had found the attenuation to be generally exponential with a decrement that was both pressure a n d voltage dependent.
Found, however, that although the connection to an electrical emf is necessary for the existence of this precursor, it is not sufficient to account for all of its peculiarities. They proved that the precursor derives the bulk of its vitality from the adjacent driver plasma by secondary processes and it is this which gives it its intense luminosity, insensitivity to intromittent electrodes, insensitivity to electrostatic grounds, etc. They then designed an apparatus which would produce the precursor intentionally.
A search for microwaves in the latter apparatus was made without success. Mills et a/. therefore concluded that the delivery of energy to the precursor primarily related to the base (quasi-dc) frequency of the capacitor discharge. The work reported by Latimer et a/. is of additional interest because it bears on conditions in the photopreionized gas in the main expansion chamber, which is seen to range in temperature from a minimum of 20 eV to a maximum of 70 eV as shown in Fig. 47. 50 RICHARD G .