Green light 2ω as an x-ray streak camera fiducial

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Abstract
The fiducial system for the multiple optical and x-ray streak cameras on the two Nova target chambers is intended to allow cross comparison of time-resolved data from laser plasmas to an accuracy of ±50 ps. Development of the system has led to the discovery that Al-coated fiber optics incorporated into the x-ray photocathode can be made to produce photoelectrons when irradiated by ∼1 μJ of 2ω light. The low loss and dispersion of 2ω light in fused silica fibers are significant advantages over our original intention of using 3ω light. Results indicating input and output pulse lengths and required energies to produce photoelectrons will be discussed.

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