High gain operation of Ne-like Cr x-ray laser based on transient lasing process has been predicted by a model simulation. The rapid heating of preformed plasmas without causing over-ionisation has been found to be the main reason for the high gain operation. The model calculation shows that transient high gain can be generated on (2p_(1/2), 3p_(1/2))_(J=0) → (2p_(1/2), 3s_(1/2))_(J=1) transition at 27.5 nm using only a few joules of drive energy. The calculation has also defined the minimum requirement for drive energy of picosecond lasers.
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