With the help of a diagnostic system designed for "DELFIN-1" installation we have measured the velocities 250 km/s. The agreement between the attained compression velocities and the obtained experimental scaling is shown. The compression velocity of shell targets is one of the most impotant parameters determining the feasibility to reach thermonuclear temperatures of the compresse:. gas. The compression velocity of shell targets at "DELFIN-1" installation has been measured by three independent methods. Two of the noted methods are based on studying the spectral and spa-tial characteristics of 2Gc..)c. harmonic emission ( is the laser frequency) generated2fn plasma. As 2ed.-, harmonic occurs in the vicinity of the critical density region (nc=10²¹ cm-3)the measuring of Doppler spectral shift of the harmonic line with respect to nominal value λi/2 c5299 Å allows the determination of the n, region motion uc. On the other hand, the registration of the harmonic luminescence spatihl localization a/lows one to directly observe the n, region and to define its motion.

Date Published: 1 February 1985
PDF: 4 pages
Proc. SPIE 0491, 16th Intl Congress on High Speed Photography and Photonics, (1 February 1985); doi: 10.1117/12.968043

Published in SPIE Proceedings Vol. 0491:
16th Intl Congress on High Speed Photography and Photonics
Michel L. Andre; Manfred Hugenschmidt, Editor(s)