The commissioning of the advanced radiographic capability laser system: experimental and modeling results at the main laser output

Nicola, J. M. Di; Yang, S. T.; Boley, C. D.; Crane, John K.; Heebner, John E.; Spinka, Thomas; Arnold, P.; Barty, C. P. J.; Bowers, M. W.; Budge, T.; Christensen, Kim; Dawson, Jay W.; Erbert, G.; Feigenbaum, Eyal; Guss, Gabe; Haefner, C.; Hermann, M. R.; Homoelle, D.; Jarboe, J.; Lawson, Janice K.; Lowe-Webb, R.; McCandless, Kathleen; McHale, B.; Pelz, Lawrence J.; Pham, P. P.; Prantil, M.; Rehak, M.; Rever, Matthew; Rushford, M. C.; Sacks, Richard A.; Shaw, Michael J.; Smauley, D. A.; Smith, L. K.; Speck, Rainer; Tietbohl, G.; Wegner, Paul J.; Widmayer, C.

doi:10.1117/12.2080459

Cited by 35 publications

(6 citation statements)

References 16 publications

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“…9,10 The ARC laser system implements chirped pulse amplification and subsequent pulse compression on four beamlines of the NIF to produce petawatt-class short pulses (1 to 30 ps) at 1053 nm with a total energy of 3.2 to 13.6 kJ. To avoid buildup of nonlinear effects while propagating energetic short pulses in air or bulk materials, pulse compression, transport, and focusing optics must rely on optical thin-film mirror coatings operating in a vacuum environment.…”

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confidence: 99%

Laser-induced damage of intrinsic and extrinsic defects by picosecond pulses on multilayer dielectric coatings for petawatt-class lasers

et al. 2016

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Abstract. We describe a damage testing system and its use in investigating laser-induced optical damage initiated by both intrinsic and extrinsic precursors on multilayer dielectric coatings suitable for use in high-energy, large-aperture petawatt-class lasers. We employ small-area damage test methodologies to evaluate the intrinsic damage resistance of various coatings as a function of deposition methods and coating materials under simulated use conditions. In addition, we demonstrate that damage initiation by raster scanning at lower fluences and growth threshold testing are required to probe the density of extrinsic defects, which will limit large-aperture optics performance. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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confidence: 99%

Laser-induced damage of intrinsic and extrinsic defects by picosecond pulses on multilayer dielectric coatings for petawatt-class lasers

et al. 2016

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“…As already mentioned, the level of the RKE during burn, which is difficult if not impossible to measure with other diagnostics, can also be probed with the MRSt. Furthermore, MRSt will complement the Advanced Radiographic Capability (ARC) 13 leading to a much deeper understanding of the fuel assembly, hot-spot formation, and stagnation. Additionally, two orthogonal MRSt lines-of-sight would quantify asymmetries in the evolution of the fuel assembly and hot-spot formation and put stringent constraints on the implosion modeling.…”

Section: ρR(t ) Y N (T ) and Apparent T I (T ) From The Time-rementioning

confidence: 99%

The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)

Frenje

Hilsabeck

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et al. 2016

Review of Scientific Instruments

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The next-generation magnetic recoil spectrometer for time-resolved measurements of the neutron spectrum has been conceptually designed for the National Ignition Facility. This spectrometer, called MRSt, represents a paradigm shift in our thinking about neutron spectrometry for inertial confinement fusion applications, as it will provide simultaneously information about the burn history and time evolution of areal density (ρR), apparent ion temperature (T), yield (Y), and macroscopic flows during burn. From this type of data, an assessment of the evolution of the fuel assembly, hotspot, and alpha heating can be made. According to simulations, the MRSt will provide accurate data with a time resolution of ∼20 ps and energy resolution of ∼100 keV for total neutron yields above ∼10. At lower yields, the diagnostic will be operated at a higher-efficiency, lower-energy-resolution mode to provide a time resolution of ∼20 ps.

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“…High-power laser systems are used worldwide to support high-energy-density scientific research activities, inertial confinement fusion (ICF), and astrophysics communities [1][2][3][4][5][6][7][8][9][10][11][12]. Typically, single or multiple beams are pointed at a small target or accurately injected into a target through a small hole.…”

Section: Introductionmentioning

confidence: 99%

“…Through these efforts, beam-pointing fluctuations can be reduced to 7 μrad or less, which is sufficiently stable for a nanosecond laser system. Although pointing fluctuations of approximately 5-7 μrad are acceptable, the application of picosecond-petawatt laser systems is limited; incoherent and coherent addition in an ultrahigh-intensity laser system require precise spot overlapping [3,4,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The Advanced Radiographic Capability (ARC) [3,4] at the National Ignition Facility (NIF) [1,2] sets beamlets to focus on the NIF target and impinge on an array of backlighters; the backlighting material produces bursts of high-energy x-rays that illuminate an imploding fuel capsule. The backlighter can be a gold wire with a diameter of 25 μm or less, precisely aligned to coincide with the focal spot, as 20% of the encircled energy for each beamlet lies within a 25-μm radius.…”

Section: Introductionmentioning

confidence: 99%

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Stability improvement of multi-beam picosecond–petawatt laser system for ultrahigh peak-power applications

et al. 2023

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Pointing fluctuations of beams reduce the possibility of incoherent or coherent addition for ultrahigh peak power in a multi-beam picosecond–petawatt laser system. Pointing fluctuations on the target were observed on Shenguang Upgrade Petawatt (SGII-UP-Petawatt) beam using a high-speed and high-resolution active pointing stabilization control system. The maximum frequency of the pointing fluctuations was less than 50 Hz, and the amplitude was approximately 2.8 µrad (RMS). An online test of pointing fluctuations with active stabilization control demonstrated that pointing fluctuations could be reduced to 0.63 µrad (RMS), approximately one-quarter of that without active stabilization control. The benefits of reduced pointing fluctuation were estimated using a multi-beamlet petawatt laser system; the results demonstrated that peak power could be increased by 51.7% when active stabilization control was used in an eight-beamlet picosecond–petawatt laser system.

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The commissioning of the advanced radiographic capability laser system: experimental and modeling results at the main laser output

Cited by 35 publications

References 16 publications

Laser-induced damage of intrinsic and extrinsic defects by picosecond pulses on multilayer dielectric coatings for petawatt-class lasers

Laser-induced damage of intrinsic and extrinsic defects by picosecond pulses on multilayer dielectric coatings for petawatt-class lasers

The magnetic recoil spectrometer (MRSt) for time-resolved measurements of the neutron spectrum at the National Ignition Facility (NIF)

Stability improvement of multi-beam picosecond–petawatt laser system for ultrahigh peak-power applications

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