Dear colleagues, I am pleased to invite you to a dedicated *workshop on high-temperature pressure calibration*, which will be held on the *afternoon of 28 September 2025* at Ehime Kenmin Bunka Kaikan (Ehime Prefectural Convention Hall), *Matsuyama, Japan*, as a *pre-meeting event* of *AIRAPT-29*. https://smartconf.jp/content/airapt29/program The goal of this workshop is to develop reliable *pressure calibration methods at high temperatures* for use with diamond anvil cells (DACs) and multi-anvil (MA) presses, with the aim of achieving *consistent and reproducible pressure values across laboratories and techniques*. This initiative builds upon the recent activities of the *AIRAPT IPPS Task Force*, which focused on establishing *room-temperature pressure reference points* (*PRPs*) for the MA community. That effort sought to link traditional MA PRPs to the *Ruby2020 pressure scale*, recently recommended to the DAC community, thereby enhancing cross-platform consistency. A key milestone in this effort was the room-temperature pressure calibration workshop held on 23 July 2023 at the Edinburgh International Conference Centre, where community consensus began to emerge around a set of revised PRPs up to ~30 GPa. Moving forward, we recognize that room-temperature PRPs are only the first step. High-temperature calibration is critical for the reliability of high P-T experiments in Earth and planetary sciences (e.g., understanding deep mantle processes, planetary interiors) and materials science (e.g., synthesis of novel materials, studies of phase diagrams). However, temperature-dependent uncertainties in pressure determination remain a major challenge. Thus, this upcoming workshop will focus on sharing approaches, experimental data, and strategies toward *defining robust pressure reference schemes at high temperatures*. The following invited speakers have confirmed their participation: * * * *Agnès Dewaele* (CEA/DAM/DIF, Arpajon, France) * *Bin Chen* (University of Hawai‘i at Mānoa, Honolulu, HI, USA) * *Robert Farla* (DESY, Hamburg, Germany) * *Kurt Leinenweber* (Arizona State University, Tempe, AZ, USA) * *Yu Nishihara* (Ehime University, Matsuyama, Japan) We strongly encourage all participants—especially early-career researchers and experimentalists actively working with high P-T apparatus—to give a presentation and contribute their ideas, results, or perspectives on high-temperature pressure calibration. Short presentations highlighting challenges, datasets, or proposed approaches are especially welcome. If you would like to *present your work* or simply to *participate in the discussion*, please contact me at: 📧 tomo.katsura@uni-bayreuth.de Tomo Katsura (University of Bayreuth, Bayreuth, Germany) /Workshop Organizer/ I hope that many high P-T researchers will join us in Ehime to help shape the future of pressure calibration at high temperatures. -- Tomoo Katsura Professor of Structure and Dynamics of Earth Materials Bayerisches Geoinstitut, University of Bayreuth 95440 Bayreuth, GERMANY Tel: +49(0)921 55-3791 (office) 3700/3766 (institute) Fax: +49(0)921 55-3769 E-mail:tomo.katsura@uni-bayreuth.de https://katsurabgi.jimdo.com/