Frequency-modulated technique for the study of the Tonks-Dattner resonances

Cremin, A.A.; Sexton, M. C.

doi:10.1049/el:19650271

Cited by 3 publications

(2 citation statements)

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“…Our observations of the sense of the hysteresis between ne and i are in conflict with those reported by Cremin and Sexton (1965). We have consequently been particularly careful to check the accuracy of our observations and are confident that the hysteresis is correctly described in this paper.…”

Section: Discussioncontrasting

confidence: 62%

“…A consequence of the high ion mobility in the positive columns of low-pressure mercury discharges is that the electron number density ne follows changes in discharge parameters on a microsecond time scale (Barnes 1952, Dattner 1957. The observation of a phase lag between ne and a 50 Hz sinusoidally modulated discharge current (Cremin andSexton 1965, Hsuan et al 1967) must therefore be taken as an indication that some other discharge parameter, whose time constant is comparable with the 50 Hz modulation period, is perturbed by changes in current.…”

Section: Introductionmentioning

confidence: 99%

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Neutral particle density modulation in the positive column of a low-pressure mercury discharge modulated at low frequencies

Riley¹

1970

J. Phys. D: Appl. Phys.

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A clockwise hysteresis between electron number density and discharge current has been observed in the positive column of a mercury discharge modulated at low frequencies. The hysteresis is shown to be associated with changes in neutral density during the modulation cycle. Rates of neutral density change produced by step transients in discharge current have been measured by monitoring the current required to produce the main Tonks-Dattner resonance of the column. A comparison of these rates with probe measurements of ion wall current indicated that between 2 and 6% of the ion wall flux was retained on the column wall for periods greater than 500 milliseconds. It is shown that this phenomenon satisfactorily accounts for the hysteresis observed when the discharge current is modulated sinusoidally.

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Section: Discussioncontrasting

confidence: 62%

Section: Introductionmentioning

confidence: 99%