ON ION BEAM ENERGY CONVERSION INTO SOFT X-RAYS
An suggestion has been made that a 1 MJ, 10**13W/cm**2 ion beam pulse be converted into soft X rays with the additional effect of pulse time compression and power amplification by a factor of 10. Such a time compression would be desirable in applications to inertial confinement fusion (ICF) since pulse times of typical ion beam drivers tend to be longer (about 100 ns) than needed for ICF target implosions (about 10 ns). A numerical investigation of this process is carried out in this report. It is found that the numerical simulation of ion beam energy conversion into radiant energy does not show the power amplification expected by T. Yabe. It is shown that the emitted radiation flux cannot exceed the input flux, at least not for the uniform conversion layer studied here. Most efficient conversion is expected for layers with optical thickness in the order of 1. Hydrodynamic losses can be reduced by heating the conversion layer supersonically. The condition for supersonic heating has been derived. An efficient way to fulfill this condition is to use low density layers.
Bibliographic Reference: JAPANESE JOURNAL OF APPLIED PHYSICS, VOL. 23 (1984) NO. 9. PP. L728-L730
Record Number: 1989123083900 / Last updated on: 1987-01-01
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