Direction of motion of striations in an inert gas-hydrogen mixture

1561. Investigation of the fast striations in prebreakdown of a gas discharge using microwave receiver techniques

“…EqSo (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27) and (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28) are utilized» These equations are as follows :…”

“…In order to consider a rectangular pulse, the result of a single pulse ^H q ' , where is in number of ions per cm^ when the entire length of the tube is considered, n = 1 -Sq , and is given by 28) and where the other quantities are already defined. In computing p^, such values of 0, i^, a's and y's will be chosen that will result in the largest value of p. encountered.…”

“…Oleson using a different approach particularly in the problem of ion production and loss [40] It is obvious that this analysis, even though it considers most of the processes occuring in the discharge, does not lead to any quantitative explanation of the observations on striations, nor does it give any clues as to the origin or the temporal growth of striations » The latter prcb= lems are analysed fully in a series of papers by Pekarek [21,22,23,26,27,28], They are briefly discussed in the following pages.…”

“…The formulation of the problem leads to an equation of 18th degree in k, the phase constant of the striation modes, which, if it were pos sible to solve, would lead to solutions of the frequency of the various modes of striation observed by Donahue and Dieke, Although the analysis qualitatively explains the existence of the modes, it gives no quantative explanation of the observations on striations, nor does it give any clues as to the origin or the temporal growth of striations, Pekarek, in a series of papers [21][22][23][24][25][26][27][28] tackles the latter problems theoretically and experi mentally, For his v/ork he uses the method of artificially perturbing the plasma of the positive column and observing the propagation of what he calls, the wave of stratification. The results of his final analysis are in close agreement with his experimental observations under typical conditions.…”

“…In this respect extensive investigations have been made by Pekarek [21][22][23][24][25][26][27][28] who studied the growth of striations by introducing an external perturbation at the cathode end of a homogeneous unstriated positive column which gave rise to the production of what he called the wave of stratification» In an analysis intended to justify this observation, Pekarek initially formalized the problem [23] which led to a solution that qualitatively pre= dieted the existence of the wave of stratification»…”