[S-IT16] Deep Earth Sciences

[SIT16-P06] Development of the GHz-DAC ultrasonics over the last twelve years

*Akira Yoneda^1,2, Ryo Tsuruoka¹, Takuto Kato¹, Seiji Kamada³, Hidenori Terasaki⁴, Tadashi Kondo¹, Daisuke Yamazaki² (1.Department of Earth and Space Science, Osaka University, 2.Institute for Planetary Materials, Okayama University, 3.Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 4.Department of Earth Science, Okayama University)

Keywords:GHz, diamond anvil cell, elasticity

We have developed a GHz ultrasonic technique to measure elastic velocities of thin samples (a few dozen mm) squeezed in a diamond anvil cell (DAC). We have devised (1) to construct GHz buffer rods, (2) to improve acoustic coupling between buffer rod and diamond anvil, (3) to improve SN ratio in measurement, and (4) to estimate the most probable travel time. We conducted a preliminary test with polycrystalline MgO; the consistency with previous studies suggests future potentiality of the GHz-DAC ultrasonics.