Fast video registration of transition processes from diffuse mode to anode spot mode in high-current arc with copper-chromium electrodes

S. Popov, A. Schneider, V. Lavrinovich, A. Batrakov, S. Gortschakow, A. Khakpour

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    4 Citations (Scopus)

    Abstract

    Transition process from a diffuse to anode spot mode in high-current vacuum arc discharge with Cu-Cr electrodes has been studied experimentally. Images of the arc were recorded with a frequency of about 25000 frames per second synchronously with the acquisition of current and voltage waveforms. Experiments clarify that after the current reaches a certain threshold value (4 to 5 kA for bulk-type, 2-cm electrodes), the arc discharge passes from diffuse mode to the mode with anode spot and voltage increased by ∼20 V. In this mode, bright anode jet appears; cathode micro spots are reduced in number and grouped in front of the anode jet with the formation the cathode macro spot. In such a threshold regime, the discharge can change to the anode-spot mode and back to diffuse mode many times, with transition time in the microsecond range. With increasing current amplitude, anode spot mode becomes more stable, cathode and anode macro-jets are coming closer together forming a quasi-continuous radially-constricted discharge channel. The constriction of discharge is accompanied by increasing power density on both electrodes. In the case of TMF type electrodes, the constricted plasma channel moves azimuthally along the electrode lobe.

    Original languageEnglish
    Title of host publicationISDEIV 2016 - Proceedings of the 27th International Symposium on Discharges and Electrical Insulation in Vacuum
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Volume2016-November
    ISBN (Electronic)9781467397803
    DOIs
    Publication statusPublished - 18 Nov 2016
    Event27th International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV 2016 - Suzhou, China
    Duration: 18 Sep 201623 Sep 2016

    Conference

    Conference27th International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV 2016
    CountryChina
    CitySuzhou
    Period18.9.1623.9.16

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    ASJC Scopus subject areas

    • Software
    • Computer Networks and Communications

    Cite this

    Popov, S., Schneider, A., Lavrinovich, V., Batrakov, A., Gortschakow, S., & Khakpour, A. (2016). Fast video registration of transition processes from diffuse mode to anode spot mode in high-current arc with copper-chromium electrodes. In ISDEIV 2016 - Proceedings of the 27th International Symposium on Discharges and Electrical Insulation in Vacuum (Vol. 2016-November). [7748756] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/DEIV.2016.7748756