17:15 〜 18:45
[SCG49-P05] 高エネルギー・高フラックスX線を用いた大容量プレスでの高速その場測定
キーワード：高圧力、高速時分割、その場測定
The combination of synchrotron radiation and large-volume presses has been used to precisely determine the phase transition pressure of Earth's mantle minerals and to understand the stratigraphic structure of the Earth's interior. In recent years, measurements of dynamic properties have become increasingly important for understanding the Earth's dynamics. Recent developments in in situ measurement techniques using monochromatic X-rays from synchrotron radiation and large volume presses have enabled in situ stress-strain measurements down to the lower mantle pressures. On the other hand, sub-second in-situ observations of fast-moving dynamic processes such as rupture, including seismic phenomena, are difficult to perform because the flux density of synchrotron radiation X-rays with bending magnets is relatively low and stress-strain measurements (especially stress measurements) require 1 to 5 minutes to perform. Therefore, a portable large volume press with a 5-axis stage has been installed at an undulator light source beamline of BL05XU, SPring-8, in which the high flux 100 keV pink beam can be used. To allow fast slit size changes, two rotating slits were newly developed to enable slit switching at a maximum of 144 Hz. A flat panel detector and a CMOS camera with a GaGG scintillator has been used for 2D-XRD and X-ray radiography measurements to observe stress and strain, respectively. This system allows X-ray radiography and 2D-XRD measurements to be taken at a maximum rate of 6 Hz. Furthermore, the potable press stage has a maximum movement speed of 1 mm/s, a feature that enables high-speed 2D-XRD map measurements. This is expected to make it possible to reveal the stress distribution and mineral distribution within the sample to be revealed under high pressure conditions. There are also plans to build a new beamline for high volume pressing using the same light source and we would like to discuss these plans further.