High Power Laser Science and Engineering, Volume. 8, Issue 1, 010000e8(2020)
Laser-system model for enhanced operational performance and flexibility on OMEGA EP On the Cover
Fig. 1. OMEGA EP laser-system configuration. (a) Each of the four beamlines uses a folded architecture and type-I/type-II frequency-conversion crystal design based on the NIF. (b) Block diagram of (a) showing locations of pulse-shape, beam-profile and energy-measurement diagnostics used with the
Fig. 2. Beamline pulse shape, energy and near-field beam profile are predicted in real time by
Fig. 3. Plot of the inferred saturation fluence versus beamline output fluence from optimization fits to OMEGA EP beamline 3 data for nine-main-amplifier and seven-booster-amplifier configuration. Only shots with pulse widths and beam output energies
Fig. 4. Pulse-width dependence of empirical scaling factor
Fig. 5. (a) Fifteenth-order Legendre fit to the measured total small-signal gain for beamline 1, nine-main-amplifier configuration and (b) its
Fig. 6. Horizontal lineouts of column-averaged, beamline 1 single-disk, small-signal gain maps for different numbers of main-amplifier disks fired. (a) Odd number of cavity amplifiers; (b) even number of cavity amplifiers.
Fig. 7. Flowchart illustrating the quasi-Newton method used for
Fig. 8. Comparison of
Fig. 9. Comparison of
Fig. 10.
Fig. 11. (a) Predicted and requested UV pulse shapes showing how day-to-day changes in regen performance are compensated using
Fig. 12. Examples showing facility flexibility enabled by
Fig. 13. (a) Pre-shot prediction and (b) measurement of approximately 27-ns composite UV pulse formed by incoherent addition of the individual beamline pulse shapes and beam-to-beam timing (shot 31,182).
Fig. 14. Measured beamline 3 output IR near-field beam-fluence profile (a) before moving the beam-shaping apodizer (contrast
Fig. 15. Beamline 3 UV near-field beam-fluence profiles showing
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M. J. Guardalben, M. Barczys, B. E. Kruschwitz, M. Spilatro, L. J. Waxer, E. M. Hill. Laser-system model for enhanced operational performance and flexibility on OMEGA EP[J]. High Power Laser Science and Engineering, 2020, 8(1): 010000e8
Category: Research Articles
Received: Nov. 23, 2019
Accepted: Feb. 7, 2020
Published Online: Mar. 27, 2020
The Author Email: M. J. Guardalben (mgua@lle.rochester.edu)