"PUMA" research group
I organize the Progressive Ultrahigh-pressure Multi-Anvil (PUMA) international research group.
Current group members
Takayuki Ishii
Group leader
Recruitment of students and postdocs
We are always looking for bright and engaged students and postdocs to join the PUMA research group.
Some general information is provided on this page.
Further questions can be e-mailed to Takayuki Ishii (takayuki.ishii@hpstar.ac.cn) and Tomoo Katsura (tomo.katsura@uni-bayreuth.de or tomoo.katsura@hpstar.ac.cn)
What we study
The primary tool of the PUMA group is the large-volume multi-anvil press (LVP). Although many research groups at the HPSTAR adopt the diamond anvil cell as their primary tool, we adopt the LVP because of its high reliability: the sample pressures and temperatures are more precise, stable, and homogeneous by one order of magnitude, and obtained results are highly reproducible. In contrast to most LVP laboratories in the world, we have the following advanced technologies.
Our advanced multi-anvil technology
-
We can generate pressures up to 50 GPa, corresponding to the depth of 1500 km in the Earth [Ishii et al., 2019; 2022]. This pressure range is twice broader as in other laboratories (25 GPa).
-
We can generate temperatures up to 3000 K [Xie et al., 2021a], which is 1.5 times broader than others (up to 1800 K). This technique allows us, for example, to melt peridotite completely [Xie et al., 2021b].
-
We have an advanced technique of synchrotron in situ X-ray observation to determine phase relations precisely and accurately [Ishii et al., 2019; Chanyshev et al., 2022].
-
We can quench hydrous and ultramafic melts into glasses with ten times faster cooling rates [Bondar et al., 2020; 2021; 2022]. This technique allows us to investigate the properties of mantle melts using various post-analysis.
-
We can generate a highly homogeneous temperature field to prevent solid-melt segregation and investigate partial-melting rocks [Zarei et al., 2017].