Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session TP11: Poster Session VII: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: FRC, RFPs etc
ICF: Fast Ignition; Diagnostics; Computational; Laser Plasma Interactions
FUND: Computation
9:30 AM - 12:30 PM
Thursday, October 20, 2022
Room: Exhibit Hall A and Online
Abstract: TP11.00075 : Experimental measurement of planarity of a 1 TPa shock on exit from a shock amplification system
Presenter:
rosie l barker
(First Light Fusion)
Authors:
rosie l barker
(First Light Fusion)
Joshua Read
(First Light Fusion)
Matthew Betney
(First Light Fusion)
Christian Bradley
(First Light Fusion)
Hugo W Doyle
(First Light Fusion Ltd)
Nicholas Hawker
(First Light Fusion)
Collaboration:
First Light Fusion Ltd
The planarity, velocity and temperature of the shock exiting the amplifier are essential knowledge for validation of amplifier simulations and optimisation of fusion targets. By observing spatially and temporally resolved intensity of optical emission as the shock exiting the amplifier breaks out of a metal foil, the planarity of the shock can be measured. Nanosecond time resolution is required to capture the event lasting < 10 ns. If the emissivity of the metal foil is known, and the imaging system is absolutely calibrated, a temperature measurement of the shock front can be obtained and the amplifier output pressure inferred.
We present data from experiments on the large light gas gun at First Light Fusion, which fires a 32 mm diameter, 100 g projectile at the amplifier. Measured shock profiles are in excellent agreement with simulations performed using in-house codes. In some experiments the release profile is tilted, which is believed to be caused by input projectile tilt.
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