Soft X-Ray Images of Krypton Gas-Puff Z-Pinches

• Published in: Plasma science & technology Vol. 4; no. 6; pp. 1529 - 1534
• Main Authors: Meng-tong, Qiu, Bin, Kuai, Zheng-zhong, Zeng, Min, Lu, Kui-lu, Wang, Ai-ci, Qiu, Mei, Zhang, Jian-hui, Luo
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.12.2002; Northwest Institute of Nuclear Technology, Xi'an, 710024, China
• Subjects: soft x-ray images; Z-pinch plasma generator; krypton gas-puff
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/4/6/004

O4; A series of experiments has been carried out on Qiang-guang Ⅰ generator to study the dynamics of krypton gas-puff Z-pinches. The generator was operated at a peak current of 1.5 MA with a rise-time of 80 ns. The specific linear mass of gas liner was about 20 μg/cm in these experiments. In the diagnostic system, a four-frame x-ray framing camera and a pinhole camera were employed. A novel feature of this camera is that it can give time-resolved x-ray images with four frames and energy-resolved x-ray images with two different filters and an array of 8 pinholes integrated into one compact assemble. As a typical experimental result, an averaged radial imploding velocity of 157 km/s over 14 ns near the late phase of implosion was measured from the time-resolved x-ray images. From the time-integrated x-ray image an averaged radial convergence of 0.072 times of the original size was measured. An averaged radial expansion velocity was 130 km/s and the maximum radial convergence of 0.04 times of the original size were measured from the time-resolved x-ray images. The dominant axial wavelengths of instabilities in the plasma were between 1 and 2 mm. The change in average photons energy was observed from energy spectrum- and time-resolved x-ray images.