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 UO06: Warm Dense Matter
2:00 PM–5:00 PM,
Thursday, October 20, 2022
Room: Ballroom 111 C
Chair: Suxing Hu, LLE
Abstract: UO06.00002 : Coupling Shock Compression and Ultrafast X-ray Heating to Observe New Phase Transitions*
2:12 PM–2:24 PM
Presenter:
Nicholas J Hartley
(SLAC - Natl Accelerator Lab)
Authors:
Nicholas J Hartley
(SLAC - Natl Accelerator Lab)
Siegfried H Glenzer
(SLAC - Natl Accelerator Lab)
Kento Katagiri
(Osaka Univ)
Kohei Miyanishi
(RIKEN SPring-8 Center)
Norimasa Ozaki
(Osaka Univ)
Claudia C Parisuana-Barranca
(SLAC - Natl Accelerator Lab)
Emma E McBride
(SLAC - Natl Accelerator Lab)
Previous work at the SACLA X-ray Free Electron Laser demonstrated that its 2-color mode is able to both drive and observe such disordering on timescales of up to 300 fs. In this experiment, we aimed to observe the effect of atomic structure on this disordering, by combining the X-ray pump-probe with shock compression of silicon and germanium samples. At around 10 GPa, these undergo a phase transition from a diamond cubic structure to a closer-packed β-tin structure, which simulations suggest should disorder more slowly. This presentation will present the results of the experiment, and our preliminary analysis of the data collected.
*The XFEL experiments were performed at the BL3 of SPring-8 Angstrom Compact free electron LAser (SACLA) with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2022A8050)SLAC HED research acknowledges funding through FES FWP-100182.
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