Abstract
We present what to our knowledge is the first time-resolved measurement of the electron density profile of a laser-driven concentric implosion. Cylindrically symmetric plasmas are driven by two spatially coincident line-focused laser pulses. If a plasma channel is allowed to form after the first pulse, the second pulse drives an inward compression wave which converges on the channel axis and later relaxes. The two-pulse absorption and ionization can significantly exceed that due to a single pulse of the same total energy, with the second pulse being almost totally absorbed.
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