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Title: Implementation and application of the peak scaling method for temperature measurement in the laser heated diamond anvil cell

In this work, a new design for a double-sided high-pressure diamond anvil cell laser heating set-up is described. The prototype is deployed at beamline 12.2.2 of the Advanced Light Source at Lawrence Berkeley National Lab. Our compact design features shortened mechanical lever arms, which results in more stable imaging optics, and thus more user friendly and more reliable temperature measurements based on pyrometry. A modification of the peak scaling method was implemented for pyrometry, including an iterative method to determine the absolute peak temperature, thus allowing for quasi-real time temperature mapping of the actual hotspot within a laser-heated diamond anvil cell without any assumptions on shape, size, and symmetry of the hotspot and without any assumptions to the relationship between fitted temperature and peak temperature. This is important since we show that the relationship between peak temperature and temperature obtained by fitting the Planck function against the thermal emission spectrum averaged over the entire hotspot is not constant but depends on variable fitting parameters (in particular, the size and position of the fitting window). The accuracy of the method is confirmed through measuring melting points of metal wires at ambient pressure. Having absolute temperature maps in real time allows formore » more differentiated analyses of laser heating experiments. Finally, we present such an example of the pressure variations within a heated hotspot of AgI at a loaded base pressure of 3.8 GPa.« less
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [1] ;  [1] ;  [3] ; ORCiD logo [1] ; ORCiD logo [2] ;  [1] ;  [4] ;  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Univ. of California, Santa Cruz, CA (United States). Earth and Planetary Sciences Department
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Berkeley High School, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. Univ. of California, Santa Cruz, CA (United States). Earth and Planetary Sciences Department
Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC03-76SF00098
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 8; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 47 OTHER INSTRUMENTATION
OSTI Identifier:
1482539
Alternate Identifier(s):
OSTI ID: 1463934

Kunz, Martin, Yan, Jinyuan, Cornell, Earl, Domning, Edward E., Yen, C. Ethan, Doran, Andrew, Beavers, Christine M., Treger, Aaron, Williams, Quentin, and MacDowell, Alastair A.. Implementation and application of the peak scaling method for temperature measurement in the laser heated diamond anvil cell. United States: N. p., Web. doi:10.1063/1.5028276.
Kunz, Martin, Yan, Jinyuan, Cornell, Earl, Domning, Edward E., Yen, C. Ethan, Doran, Andrew, Beavers, Christine M., Treger, Aaron, Williams, Quentin, & MacDowell, Alastair A.. Implementation and application of the peak scaling method for temperature measurement in the laser heated diamond anvil cell. United States. doi:10.1063/1.5028276.
Kunz, Martin, Yan, Jinyuan, Cornell, Earl, Domning, Edward E., Yen, C. Ethan, Doran, Andrew, Beavers, Christine M., Treger, Aaron, Williams, Quentin, and MacDowell, Alastair A.. 2018. "Implementation and application of the peak scaling method for temperature measurement in the laser heated diamond anvil cell". United States. doi:10.1063/1.5028276.
@article{osti_1482539,
title = {Implementation and application of the peak scaling method for temperature measurement in the laser heated diamond anvil cell},
author = {Kunz, Martin and Yan, Jinyuan and Cornell, Earl and Domning, Edward E. and Yen, C. Ethan and Doran, Andrew and Beavers, Christine M. and Treger, Aaron and Williams, Quentin and MacDowell, Alastair A.},
abstractNote = {In this work, a new design for a double-sided high-pressure diamond anvil cell laser heating set-up is described. The prototype is deployed at beamline 12.2.2 of the Advanced Light Source at Lawrence Berkeley National Lab. Our compact design features shortened mechanical lever arms, which results in more stable imaging optics, and thus more user friendly and more reliable temperature measurements based on pyrometry. A modification of the peak scaling method was implemented for pyrometry, including an iterative method to determine the absolute peak temperature, thus allowing for quasi-real time temperature mapping of the actual hotspot within a laser-heated diamond anvil cell without any assumptions on shape, size, and symmetry of the hotspot and without any assumptions to the relationship between fitted temperature and peak temperature. This is important since we show that the relationship between peak temperature and temperature obtained by fitting the Planck function against the thermal emission spectrum averaged over the entire hotspot is not constant but depends on variable fitting parameters (in particular, the size and position of the fitting window). The accuracy of the method is confirmed through measuring melting points of metal wires at ambient pressure. Having absolute temperature maps in real time allows for more differentiated analyses of laser heating experiments. Finally, we present such an example of the pressure variations within a heated hotspot of AgI at a loaded base pressure of 3.8 GPa.},
doi = {10.1063/1.5028276},
journal = {Review of Scientific Instruments},
number = 8,
volume = 89,
place = {United States},
year = {2018},
month = {8}
}

Works referenced in this record:

Strategy and enhanced temperature determination in a laser heated diamond anvil cell
journal, May 2009
  • Deemyad, Shanti; Papathanassiou, Anthony N.; Silvera, Isaac F.
  • Journal of Applied Physics, Vol. 105, Issue 9, Article No. 093543
  • DOI: 10.1063/1.3117517