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Abstract

The design of high gain ICF targets is strongly influenced by the efficient attainment of thermonuclear ignition. In this connection we have applied the results of a study of D-T ignition in plasmas relevant to ICF, to envisage a set of suitable driver and target parameters. We have then investigated the potentiality of a class of double shell targets, requiring unshaped, moderate intensity laser pulses. To study D-T ignition in conditions close to those achieved in hollow shell implosions, we have analyzed the evolution of a system initially at uniform pressure P-o, and consisting of a cold, dense D-T plasma at density rho-c, containing a hot spot of radius R-o at temperature T-o >= 3 keV and density rho-o < rho-c. In the analysis that follows we will use the equation of state of a perfect gas for the hot spot, and that of a partially degenerate electron gas for the cold fuel, namely, epsilon-o = C-vT-o; epsilon-c = alpha-epsilon; epsilon-d = 3.1 times 10**12 rho-c**2/3(erg/g), and P = (2/3) rho-epsilon everywhere; here alpha is the isentrope parameter; other symbols are of standard use; subscript o indicates quantities at time t = 0. Preliminary results show that medium gain (G +- 100) targets with fuel mass M = 2 / 6 mg, outer shell radius R 1 = 0.4 / 0.6 cm, inner-shell radius +- R-1/3, aspect ratio 40 <= A <= 80, require 2 / 2.5 MJ in a 25 / 50 ns triangular pulse, with 0.53 / lambda <= 2mu (we have taken 0.04 <= f <= 0.4; lower mass and higher aspect ratio correspond to longer wavelength and/or lower f).

Additional information

Authors: ATZENI S, ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY);CARUSO A ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY), ENEA, CENTRO RICERCHE ENERGIA FRASCATI (ITALY)
Bibliographic Reference: 11TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, AACHEN (GERMANY), SEPT. 5-9, 1983 IN ENEA REPORT 83.23/CC, PP. 39-42, 1983 WRITE TO ENEA + CENTRO RICERCHE ENERGIA FRASCATI, SERVIZIO STUDI E DOCUMENTAZIONE, C.P. 65 00044 FRASCATI, ROMA (I
Record Number: 1989122052500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en