Section 2 PROGRESS IN LASER FUSION
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چکیده
Laser-imploded targets, especially those imploded adiabatically, attain high temperatures in the compressed core. The imploded part of the surrounding tamper is considerably colder, especially if preheat is small. Under these conditions the continuous x-ray emission from the core undergoes absorption at wavelengths characteristic of atomic species in the tamper. The resulting absorption lines can yield information on the temperature (T,), density (p), and the pAR product of the tamper (density times thickness). Absorption can be particularly strong on resonance lines of the type 1 s-2p in ions that have one or more vacancies in the n=2 shell. The optimal choice of tamper species for this method is such that at the prevailing tamper temperature, ionization will remove some of the n = 2 electrons as well as all electrons of higher shells. For the present experiment, chlorine was a good choice, and, therefore, a KC! absorption layer was embedded within the tamper. Chlorine and potassium lines were observed and used to determine the conditions within the KCB layer and, by inference, within the rest of the tamper.
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