Bulletin of the American Physical Society
23rd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 68, Number 8
Monday–Friday, June 19–23, 2023; Chicago, Illinois
Session V05: Velocimetry Diagnostics |
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Chair: Raymond Smith, Lawrence Livermore Natl Lab Room: Sheraton Grand Chicago Riverwalk Sheraton 4 & 5 |
Thursday, June 22, 2023 9:15AM - 9:30AM |
V05.00001: Time-lens Photon Doppler Velocimetry (TL-PDV) for High Velocity Dynamic Range Experiments Velat Kilic, Christopher DiMarco, Jacob M Diamond, Pinghan Chu, Kaliat T Ramesh, Zhehui Wang, Mark A Foster High energy density experiments such as inertial confinement fusion (ICF) produce extreme velocities that can exceed 100 km/s. However, the velocity dynamic range for photon Doppler velocimetry (PDV) systems is limited by the bandwidth of the recording electronics to typically < 20 km/s. Techniques in the literature such as leap-frog PDV and time-stretch PDV address this issue by either introducing a large beat frequency offset using local oscillators with different wavelengths, or by optically expanding the temporal signals using dispersion, respectively However, these existing approaches present numerous tradeoffs in terms of complexity and performance. Here we experimentally demonstrate a novel PDV approach termed time-lens PDV (TL-PDV) that addresses these tradeoffs. Compared to existing approaches TL-PDV offers reduced hardware complexity, is more efficient in optical bandwidth usage, requires minimal changes to the existing PDV set-ups, and maintains large record length. Experimentally, we demonstrate a TL-PDV system that can achieve a 74 km/s velocity dynamic range using only 12.5 GHz of electrical bandwidth. Furthermore, we measure equivalent velocity uncertainties < 100 m/s and demonstrate real-world operation on laser driven flyer experiments in the range of 1 km/s. |
Thursday, June 22, 2023 9:30AM - 9:45AM |
V05.00002: Comparing Overall PDV System Development Cost with An Open Platform and Modular Based Approach Ren Hong When designing and building PDV systems, there is a wealth of literature on how to build PDV systems and the components to use. However, it is often important to take a broader perspective on solution selection. Beside just considering components costs and the development hours, it is also important to evaluate the hidden opportunity costs, such as the development time for the control system, resources needed in maintenance and calibration. Furthermore, the system needs to be well-packaged and supported in order to reduce often costly unexpected down time, as well as thoroughly documented to ease the impact of end-user training. Here we present and evaluate the overall cost of building a PDV system against a commercial-of-the-shelf (COTS) approach to PDV that leverages an open and modular platform to reduce the hidden cost in developing, using, and maintaining PDV systems. |
Thursday, June 22, 2023 9:45AM - 10:00AM |
V05.00003: High Repetition-Rate Target Focusing Using White-Light Interferometry Jon H Eggert, Chris McGuire, Cara Vennari, Andrew Higginbotham, Luca Antonelli, Ann-Marie Norton, David McGonegle, Patrick G Heighway, Justin Wark When high repetition-rate lasers (10 Hz) are fielded for laser-driven dynamic compression experiments at x-ray free electron laser (XFEL) and other facilities the issue of how to field the experiments becomes a primary concern. Chief among these is the alignment of the target and the various pumps and probes. Specifically, the target needs to be simultaneously aligned with the XFEL beam, the drive laser beams and the VISAR probe laser at the single point in space where all three beams cross. In many experiments, the beams cross at about 45° so that if the target position is off by more than ~25% of the drive-laser spot size, the experiment will be irretrievably compromised. In an attempt to address this problem we have designed and assembled a ride-along VISAR in-line white-light interferometric objective that allows us to measure the target focal position with an adjustable precision ranging from 1 – 20 um in less than 10 ms. We will present proof of principle data demonstrating the feasibility of this system. |
Thursday, June 22, 2023 10:00AM - 10:15AM |
V05.00004: Matched Self-Phase Modulation BLR Interferometer Niv Cohen Broadband Laser Ranging (BLR) is a new optical diagnostic for measuring the position of rapidly moving surfaces and projectiles in ballistic or explosive experiments. BLR systems |
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