Experimental Studies of a Shock-Heated Dense Plasma

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High-pressure dense plasmas were produced behind the reflected shock wave in argon, krypton, or xenon gas in an arc driven shock tube. The pressure, the absolute intensity of continuum radiation, and the transmittance of the plasma at 633nm were measured. The temperature is determined from the absolute intensity and the transmittance. The plasma was luminous during several tens of microseconds. The krypton and the xenon plasmas were black body radiators in the visible region. The pressure ranges from 10 to 300-atmospheres, while the temperature is around leV. The temperature of the argon plasma agrees with the predicted value by the Rankine-Hugoniot equations but the temperature of the krypton and the xenon plasmas is less than the predicted value. The discrepancy in the values of the temperature seems to be attributed to the cooling of the plasma due to radiation energy loss. The temperature is also obtained from the experimental values of pressure and the transmittance without the value of the absolute intensity using the theoretical value of the absorption coefficient of the plasma. This temperature agrees with the predicted value for the argon plasma behind the reflected shock and the plasmas behind the incident shock. The electron density of the plasma is calculated from the experimental values of pressure and temperature using the Debye-Huckel plasma model; it ranges from 10^<18>/cc to 10^<19>/cc behind the reflected shock. The "plasma parameter" of these plasmas ranges mainly from 2 to 7.
核融合科学研究所の論文

Experimental Studies of a Shock-Heated Dense Plasma

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