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Lerche, R.A.; Lane, S.M.; Hawryluk, A.M.; Ceglio, N.M.
Lawrence Livermore National Lab., CA (USA)1986
Lawrence Livermore National Lab., CA (USA)1986
AbstractAbstract
[en] At Livermore we are interested in imaging the thermonuclear burn region of fusion targets irradiated at our Nova laser facility. We expect compressed core diameters to be 10's of microns, and would like images with better than 10-μm resolution. Alpha particle images provided the first direct information about the thermonuclear burn geometry in thin walled exploding pusher targets. In future high density target experiments, only highly penetrating radiations like the 14-MeV neutrons will escape the target core to provide information about the burn region. To make the measurement with a neutron ''pinhole'' camera requires a 10μm pinhole through about 10 cm of material and 1014 to 1015 source neutrons. Penumbral imaging offers some improvement over a pinhole. Zone plate coded imaging (ZPCI) techniques are particularly well suited for imaging small objects like the compressed core of a laser fusion target. We have been using ZPCI techniques to image nonpenetrating radiations like x rays and alpha particles for about 10 years. The techniques are well developed. Imaging penetrating radiations like 14-MeV neutrons using ZPCI techniques has several possible advantages. The large solid angle subtended by the Zone plate might substantially reduce the required target neutron yield needed to produce a useful image, and a neutron zone plate system with 10-μm resolution might be easier to fabricate and characterize than a pinhole system. This paper explores the use of ZPCI techniques with penetrating radiation
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28 Jan 1986; 15 p; 7. international workshop on laser interaction and related plasma phenomena; Monterey, CA (USA); 28 Oct - 1 Nov 1985; CONF-851053--13; Available from NTIS, PC A02/MF A01 as DE86009724
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