Abstract
Enhancement of gain in the X-ray spectral region at increased population densities may be possible by photon pumping of specific levels through the absorption of intense line emission at the same energy from other ions. Experiments on a Na 9+ pumping Ne 8+ test case are described. The neon ions are shown to be produced from cryogenically frozen layers; and 25 MW of pump line emission at 11 Å has been measured in early experiments. Plans are described for a combined gain experiment.
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