CO2 laser heating system for in situ radial x-ray absorption at 16-BM-D at the Advanced Photon Source

Christian Childs; Dean Smith; G Alexander Smith; Paul Ellison; Daniel Sneed; Jasmine Hinton; Emily Siska; Jeffrey S Pigott; Eric Rod; William O'Donnell; Ran Salem; Blake Sturtevant; R Jason Scharff; Nenad Velisavljevic; Changyong Park; Ashkan Salamat

doi:10.1063/5.0086642

CO₂ laser heating system for in situ radial x-ray absorption at 16-BM-D at the Advanced Photon Source

Rev Sci Instrum. 2022 Aug 1;93(8):083901. doi: 10.1063/5.0086642.

Authors

Affiliations

¹ Department of Physics and Astronomy, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA.
² Nevada Extreme Conditions Laboratory, University of Nevada, Las Vegas, Las Vegas, Nevada 89154, USA.
³ Shock and Detonation Physics (M-9), Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
⁴ HPCAT, X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
⁵ Physics Department, Nuclear Research Center Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.
⁶ Mission Support and Test Services, LLC, North Las Vegas, Nevada 89030, USA.

PMID: 36050120
DOI: 10.1063/5.0086642

Abstract

We present a portable CO₂ laser heating system for in situ x-ray absorption spectroscopy (XAS) studies at 16-BM-D (High Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory). Back scattering optical measurements are made possible by the implementation of a Ge beamsplitter. Optical pyrometry is conducted in the near-infrared, and our temperature measurements are free of chromatic aberration due to the implementation of the peak-scaling method [A. Kavner and W. R. Panero, Phys. Earth Planet. Inter. 143-144, 527-539 (2004) and A. Kavner and C. Nugent, Rev. Sci. Instrum. 79, 024902 (2008)] and mode scrambling of the input signal. Laser power stabilization is established using electronic feedback, providing a steady power over second timescales [Childs et al., Rev. Sci. Instrum. 91, 103003 (2020)]-crucial for longer XAS collections. Examples of in situ high pressure-temperature extended x-ray absorption fine structure measurements of ZrO₂ are presented to demonstrate this new capability.