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This study describes spectroscopic measurement of pulsed arc discharge in high pressure CO2 including supercritical (SC) phase (1.6–8.1 MPa). A positive nanosecond pulsed voltage was applied to a needle-to-plane electrode. Spectral broadening of OI at 777 nm increased from gas to sub-critical phase and decreased around the critical condition of CO2. The decrease was presumed to be caused by critical...
In this paper, dependence of positive polarity nanosecond pulsed breakdown voltage on CO2 density was examined from gas to supercritical (SC) phases. The pulsed voltage with equivalent voltage rise rate (0.75 kV/ns) was applied to needle-to-plane electrode in all experimental conditions. In addition, the time lag of spark at high pressure gas and SC phases were investigated with Laue plots. The obtained...
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