High speed and spectroscopic investigation of 300 kV pulsed vacuum spark in centimeter gap

Bochkarev, M. B.; Zemskov, Yu. A.; Uimanov, I. V.

doi:10.1109/deiv.2010.5625773

Cited by 4 publications

(3 citation statements)

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“…One of the characteristics of the cathode spot is the fluctuation of its parameters, which has been reported by many authors. Fluctuation in the cathode fall voltage, current and luminosity [27,28] and plasma temperature [26] can sometimes be several times greater than the average value of the parameter. Indeed, these fluctuations can provide high values of V c and T e for the initial stage of cathode spot operation.…”

Section: Some Results and Discussionmentioning

confidence: 99%

“…According to the experimental results (e.g. [27,28]), the fluctuation in voltage can increase the cathode fall voltage up to higher than 100 V for a copper cathode. In this scenario, the existence of voltage oscillation is due to the arc attempt to provide the necessary condition for the formation of a new spot.…”

Section: Contribution Of Different Heating Terms and Their Related Sc...mentioning

confidence: 99%

“…However, such high values of these quantities cannot be provided in the ignition stage of the cathode spot operation. On the other hand, the existence of fluctuation in spot parameters has been established by experimental works [25][26][27][28] and it seems that these fluctuations can play an important role in spot ignition by providing higher values of cathode fall voltage [27,28] or plasma temperature [26] at the spot initiation stage.…”

Section: Introductionmentioning

confidence: 99%

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The heating sources of spots on the vacuum arc cathodes

Askari¹,

Minoo²

2009

J. Phys. D: Appl. Phys.

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We have considered two stages in the development of a spot on the surface of a vacuum arc cathode: the stage of ignition and the stage of the remaining arc lifetime which consists of arc spot operation until ultimately it is extinguished. A model for the near cathode region of electric arc has been applied to obtain different parameters involved in the cathode spot region during the spot ignition stage. This model is based on the construction of a thin sheath near the cathode wall and electron emission upon the thermo-field theory of electron emission. The model is time-dependent and hence the different parameters of the cathode, plasma and sheath can be derived as a function of time. In particular, we determine the required values of the plasma and sheath parameters for spot ignition on the smooth cathode surface. Based on these calculations and taking into consideration the fluctuation in plasma and sheath parameters, the contribution of different heating mechanisms at the spot initiation stage is evaluated. After spot ignition, some spot parameters such as temperature and mass density of spot material, electron current density and vapour pressure considerably increase. High values of the electron current density and low values of the electrical conductivity of the dense plasma in the spot region significantly increase Joule heating during the evolution stage of spot operation.

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Section: Some Results and Discussionmentioning

confidence: 99%

Section: Contribution Of Different Heating Terms and Their Related Sc...mentioning

confidence: 99%