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Stewart Mcwilliams

PROF

 https://orcid.org/0000-0002-3730-8661

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Research Interests

I study high pressure and high temperature states of matter in the laboratory to address questions of scientific and technological interest.  I am interested in materials relevant to natural systems such as planetary interiors and to technologies such as energetic materials and inertial confinement fusion.  I develop and use ultrafast methods to create, sustain, and study extreme states.  These techniques use the diamond-anvil cell (static compression) and laser-driven shock compression (dynamic compression) to generate particular extreme states.  I visit facilities worldwide for access to high power laser systems, synchrotron radiation, and other special instrumentation.  I characterize fundamental material properties including strength, elastic moduli, optical properties, and melting points and examine how extreme conditions can be used to synthesize new materials.

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Collaborations and top research areas from the last five years

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  • The structure of liquid carbon elucidated by in situ X-ray diffraction

    Kraus, D., Rips, J., Schörner, M., Stevenson, M. G., Vorberger, J., Ranjan, D., Lütgert, J., Heuser, B., Eggert, J. H., Liermann, H. P., Oleynik, I. I., Pandolfi, S., Redmer, R., Sollier, A., Strohm, C., Volz, T. J., Albertazzi, B., Ali, S. J., Antonelli, L. & Bähtz, C. & 102 others, Ball, O. B., Banerjee, S., Belonoshko, A. B., Bolme, C. A., Bouffetier, V., Briggs, R., Buakor, K., Butcher, T., Cerantola, V., Chantel, J., Coleman, A. L., Collier, J., Collins, G. W., Comley, A. J., Cowan, T. E., Cristoforetti, G., Cynn, H., Descamps, A., Di Cicco, A., Di Dio Cafiso, S., Dorchies, F., Duff, M. J., Dwivedi, A., Edwards, C., Errandonea, D., Galitskiy, S., Galtier, E., Ginestet, H., Gizzi, L., Gleason, A., Göde, S., Gonzalez, J. M., Gorman, M. G., Harmand, M., Hartley, N. J., Heighway, P. G., Hernandez-Gomez, C., Higginbotham, A., Höppner, H., Husband, R. J., Hutchinson, T. M., Hwang, H., Keen, D. A., Kim, J., Koester, P., Konôpková, Z., Krygier, A., Labate, L., Laso Garcia, A., Lazicki, A. E., Lee, Y., Mason, P., Masruri, M., Massani, B., McBride, E. E., McHardy, J. D., McGonegle, D., McGuire, C., McWilliams, R. S., Merkel, S., Morard, G., Nagler, B., Nakatsutsumi, M., Nguyen-Cong, K., Norton, A. M., Ozaki, N., Otzen, C., Peake, D. J., Pelka, A., Pereira, K. A., Phillips, J. P., Prescher, C., Preston, T. R., Randolph, L., Ravasio, A., Santamaria-Perez, D., Savage, D. J., Schölmerich, M., Schwinkendorf, J. P., Singh, S., Smith, J., Smith, R. F., Spear, J., Spindloe, C., Suer, T. A., Tang, M., Toncian, M., Toncian, T., Tracy, S. J., Trapananti, A., Vennari, C. E., Vinci, T., Tyldesley, M., Vogel, S. C., Walsh, J. P. S., Wark, J. S., Willman, J. T., Wollenweber, L., Zastrau, U., Brambrink, E., Appel, K. & McMahon, M. I., 12 Jun 2025, In: Nature. 642, p. 351-355 5 p., 12239.

    Research output: Contribution to journal › Article › peer-review

    Open Access

  • Femtosecond temperature measurements of laser-shocked copper deduced from the intensity of the x-ray thermal diffuse scattering

    Wark, J. S., Peake, D. J., Stevens, T., Heighway, P. G., Ping, Y., Sterne, P., Albertazzi, B., Ali, S. J., Antonelli, L., Armstrong, M. R., Baehtz, C., Ball, O. B., Banerjee, S., Belonoshko, A. B., Bolme, C. A., Bouffetier, V., Briggs, R., Buakor, K., Butcher, T. & Di Dio Cafiso, S. & 105 others, Cerantola, V., Chantel, J., Di Cicco, A., Coleman, A. L., Collier, J., Collins, G., Comley, A. J., Coppari, F., Cowan, T. E., Cristoforetti, G., Cynn, H., Descamps, A., Dorchies, F., Duff, M. J., Dwivedi, A., Edwards, C., Eggert, J. H., Errandonea, D., Fiquet, G., Galtier, E., Laso Garcia, A., Ginestet, H., Gizzi, L., Gleason, A., Goede, S., Gonzalez, J. M., Gorman, M. G., Harmand, M., Hartley, N., Hernandez-Gomez, C., Higginbotham, A., Höppner, H., Humphries, O. S., Husband, R. J., Hutchinson, T. M., Hwang, H., Keen, D. A., Kim, J., Koester, P., Konopkova, Z., Kraus, D., Krygier, A., Labate, L., Lazicki, A. E., Lee, Y., Liermann, H. P., Mason, P., Masruri, M., Massani, B., McBride, E. E., McGuire, C., McHardy, J. D., McGonegle, D., McWilliams, R. S., Merkel, S., Morard, G., Nagler, B., Nakatsutsumi, M., Nguyen-Cong, K., Norton, A. M., Oleynik, I. I., Otzen, C., Ozaki, N., Pandolfi, S., Pelka, A., Pereira, K. A., Phillips, J. P., Prescher, C., Preston, T. R., Randolph, L., Ranjan, D., Ravasio, A., Redmer, R., Rips, J., Santamaria-Perez, D., Savage, D. J., Schoelmerich, M., Schwinkendorf, J. P., Singh, S., Smith, J., Smith, R. F., Sollier, A., Spear, J., Spindloe, C., Stevenson, M., Strohm, C., Suer, T. A., Tang, M., Toncian, M., Toncian, T., Tracy, S. J., Trapananti, A., Tschentscher, T., Tyldesley, M., Vennari, C. E., Vinci, T., Vogel, S. C., Volz, T. J., Vorberger, J., Willman, J. T., Wollenweber, L., Zastrau, U., Brambrink, E., Appel, K. & McMahon, M. I., 21 Apr 2025, In: Journal of applied physics. 137, 15, p. 1-17 17 p., 155904.

    Research output: Contribution to journal › Article › peer-review

    Open Access

  • Phase transition kinetics of superionic H2O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments

    Husband, R. J., Liermann, H. P., McHardy, J. D., McWilliams, R. S., Goncharov, A. F., Prakapenka, V. B., Edmund, E., Chariton, S., Konôpková, Z., Strohm, C., Sanchez-Valle, C., Frost, M., Andriambariarijaona, L., Appel, K., Baehtz, C., Ball, O. B., Briggs, R., Buchen, J., Cerantola, V. & Choi, J. & 20 others, Coleman, A. L., Cynn, H., Dwivedi, A., Graafsma, H., Hwang, H., Koemets, E., Laurus, T., Lee, Y., Li, X., Marquardt, H., Mondal, A., Nakatsutsumi, M., Ninet, S., Pace, E., Pepin, C., Prescher, C., Stern, S., Sztuk-Dambietz, J., Zastrau, U. & McMahon, M. I., 23 Sept 2024, In: Nature Communications. 15, 1, p. 1-13 13 p., 8256.

    Research output: Contribution to journal › Article › peer-review

    Open Access

  • Measurement bias in self-heating x-ray free electron laser experiments from diffraction studies of phase transformation in titanium

    Ball, O., Husband, R., McHardy, J., McMahon, M., Strohm, C., Konôpková, Z., Appel, K., Cerantola, V., Coleman, A., Cynn, H., Dwivedi, A., Goncharov, A., Graafsma, H., Huston, L., Hwang, H., Kaa, J., Kim, J., Koemets, E., Laurus, T. & Li, X. & 18 others, Marquardt, H., Méndez, A., Merkel, S., Mondal, A., Morard, G., Prakapenka, V., Prescher, C., Preston, T., Speziale, S., Stern, S., Sturtevant, B., Sztuk-Dambietz, J., Velisavljevic, N., Yoo, C., Zastrau, U., Jenei, Z., Liermann, H. & McWilliams, R., 21 Sept 2024, In: Journal of applied physics. 136, 11, p. 1-12 12 p., 115902.

    Research output: Contribution to journal › Article › peer-review

    Open Access

  • High-Pressure Synthesis of Ultra-Incompressible, Hard and Superconducting Tungsten Nitrides

    Liang, A., Osmond, I., Krach, G., Shi, L. T., Brüning, L., Ranieri, U., Spender, J., Tasnadi, F., Massani, B., Stevens, C. R., McWilliams, R. S., Bright, E. L., Giordano, N., Gallego-Parra, S., Yin, Y., Aslandukov, A., Akbar, F. I., Gregoryanz, E., Huxley, A. & Peña-Alvarez, M. & 5 others, Si, J. G., Schnick, W., Bykov, M., Trybel, F. & Laniel, D., 8 Aug 2024, In: Advanced Functional Materials. 34, 32, p. 1-12 12 p., 2313819.

    Research output: Contribution to journal › Article › peer-review

    Open Access
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