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arXiv · 2606.05333

The MuFusE Large-Volume Diamond Anvil Cell for Exploring Muon-Catalyzed Fusion at Higher Pressures and Temperatures

J. D. Kalow·J. T. Hinchen·G. Harris·E. Koukina·D. M. Harrington·P. C. McDaniel·N. J. Brennan·A. Golossanov·I. D. Spool·D. Zajac·M. Mundt·S. Varner·M. Russell·S. Bull·K. McCormack·D. Mayer·L. E. Knaian·M. Khandaker·W. Stadolnik·W. R. Cutler·A. Sampat·K. Lau·J. Betances·C. Fagan·C. R. Shmayda·M. Koch·K. Payne·N. J. L. MacFadden·J. Simon·K. Peterson·A. Gami·S. Machavarapu·A. Tejeda·J. Katz·J. A. Allen·R. Chaney·K. Kem·I. Kiniti·E. Garcia Badaracco·K. R. Lynch·P. Gandhi·C. J. Johnstone·E. Niner·C. C. Petitjean·A. Antognini·W. T. Shmayda·S. O. Newburg·A. N. Knaian
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Abstract

A new large-volume diamond anvil cell (DAC) has been developed for the Muon-catalyzed Fusion ($μ$CF) Experiment (MuFusE), enabling the compression and heating of deuterium-tritium (d-t) mixtures to pressures and temperatures needed to advance $μ$CF research. The MuFusE DAC achieves the large sample volumes necessary for high-precision fusion measurements while integrating cryogenic loading, all-metal sealing, and flexible bellows to maintain a secure environment during cell compression. Combined with remote pneumatic actuation and secondary containment, the DAC safely managed a 25 Ci tritium inventory while providing a clear optical path for in situ measurements of sample pressure and composition via laser spectroscopy. Utilizing 5 mm diameter diamond anvils oriented in the path of a high-intensity muon beam, the apparatus achieved a stable sample volume of 19.2 mm$^3$ at liquid density, pressures up to 933 MPa and temperatures up to 400 K - benchmarks that significantly exceed previously reported limits for static d-t targets.

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J. D. Kalow, J. T. Hinchen, G. Harris, E. Koukina, D. M. Harrington, P. C. McDaniel, N. J. Brennan, A. Golossanov, I. D. Spool, D. Zajac, M. Mundt, S. Varner, M. Russell, S. Bull, K. McCormack, D. Mayer, L. E. Knaian, M. Khandaker, W. Stadolnik, W. R. Cutler, A. Sampat, K. Lau, J. Betances, C. Fagan, C. R. Shmayda, M. Koch, K. Payne, N. J. L. MacFadden, J. Simon, K. Peterson, A. Gami, S. Machavarapu, A. Tejeda, J. Katz, J. A. Allen, R. Chaney, K. Kem, I. Kiniti, E. Garcia Badaracco, K. R. Lynch, P. Gandhi, C. J. Johnstone, E. Niner, C. C. Petitjean, A. Antognini, W. T. Shmayda, S. O. Newburg, A. N. Knaian. 2026-09-04. The MuFusE Large-Volume Diamond Anvil Cell for Exploring Muon-Catalyzed Fusion at Higher Pressures and Temperatures. https://doi.org/10.1063/5.0337239

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