NDLI: Cathode spot motion and burning voltage of low current vacuum arc with electrodes of copper-chromium composition in magnetic field

Content Provider	IEEE Xplore Digital Library
Author	Zabello, K.K. Barinov, Yu.A. Logatchev, A.A. Shkol'nik, S.M.
Copyright Year	2004
Description	Author affiliation: A.F.loffe Phys.- Techn. Institute, Rus. Acad. Sci., 26, Polytechnicheskaya, St.-Petersburg, 194021, Russia (Zabello, K.K.; Barinov, Yu.A.; Logatchev, A.A.; Shkol'nik, S.M.)
Abstract	The study dealt with the cathode spot (CS) motion and the burning voltage of a low-current vacuum arc with electrodes of composition CuCr30, subjected to a magnetic field. The arcs with current 25 ≪ I ≪ 35 A burned in longitudinal (normal to the cathode surface) and transversal (tangential) fields as well as in those with the induction vector inclined by angle 5° ≪ ϕ ≪ 65° to the cathode surface. Use was made of electrodes with diameter 30 mm and gap 4 mm. The field components, longitudinal $B_{n},$ and transversal $B_{r},$ varied independently in the range from 0 to 0.12T each. The superposition of the transversal magnetic field on the arc has been found to considerably increase both the constant component and noise level of the voltage. If such arc is superposed also with the longitudinal field, both the constant component and noise level decrease and at $B_{n}$ ˜ $B_{r},$ the voltage across the arc is weakly dependent of $B_{r}.$ The velocity of the retrograde (anti-Ampere) CS motion grows approximately in proportion to the growth of the transversal field induction. The proportionality factor is ˜200 m/(s.T). The increase in the longitudinal field induction causes a reduction in the magnitude of the velocity vector and its rotation with respect to the anti-Ampere direction through angle θ, its value being proportional to field inclination angle ϕ. The results obtained were compared with the data in references.
Starting Page	280
Ending Page	283
File Size	304442
Page Count	4
File Format	PDF
ISBN	078038461X
ISSN	10932941
DOI	10.1109/DEIV.2004.1418660
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-27
Publisher Place	Crimea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Low voltage Vacuum arcs Electrodes Magnetic fields Noise level Surface cleaning Surface contamination Vacuum technology Copper
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Software

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