Summary
Calculations have been made which refer to the effect of an azimuthal magnetic field on the limiting current in the low-pressure mercury arc. Measurements of the limiting current have been made using two discharge tubes, one of which contains a wire situated at the axis so that an azimuthal magnetic field can be applied. The observed effect of the magnetic field is in good agreement with the theory. The actual value of the limiting current lies below the theoretical value in the case of the tube with the central wire and a possible mechanism is suggested for this discrepancy.
Riassunto
È data una teoria relativa all’effetto di un debole campo magnetico azimutale sulla corrente limite in un arco a vapori di mercurio a bassa pressione. Sono state eseguite misure della corrente limite adoperando due tubi di scarica, uno dei quali contiene un filo posto sull’asse che permette l’applicazione del campo magnetico azimutale. L’effetto del campo magnetico è risultato in buon accordo con la teoria. L’effettivo valore della corrente limite è al disotto del valore teorico nel caso del tubo con filo centrale; viene suggerito un possibile meccanismo per spiegare questo disaccordo.
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Allen, J.E., Boschi, A. & Magistrelli, F. The limiting current phenomenon in the presence of an azimuthal magnetic field. Nuovo Cim 27, 674–692 (1963). https://doi.org/10.1007/BF02784573
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DOI: https://doi.org/10.1007/BF02784573