Design and initial results from the “Junior” Levitated Dipole Experiment
C. S. Chisholm, Thomas Berry, D. Garnier, Rodney A. Badcock, Gabriel Bioletti, Konstantinos Bouloukakis, Emily-Kei C. Brewerton, Mark Buchanan, P.J. Burt, E.V.W. Chambers, K.B. Chappell, P. Coulson, Robert C. Davidson, J.P.M. Ellingham, P. Geursen, Kent Hamilton, R. Hu, Edward Hunter, J.P. Jones, P. Kusay, Z. Lazić, B. Leuw, M. Lynch, Ratu Mataira, M. McCrohon, L. Meadows, J.R. Morris, R. Nowacki, Joshua Purvis, James H.P. RICE, M. Rutten, S. Schimanski, A. Sharma, Mohammad Siamaki, Alex Simpson, T. Simpson, B. Smith, E. Stiers, E. Swanson-Dobbs, Jr. Todd, E.O.P. Treacher, Jennifer Tyler, Sriharsha Venuturumilli, H.W. Weijers, Theo Wordsworth, Ningchuang Zhou
Abstract
OpenStar Technologies is a private fusion company exploring the levitated dipole concept for commercial fusion energy production. OpenStar has manufactured a new generation of levitated dipole experiment, called "Junior", leveraging recent advances made in high-temperature superconducting magnet technologies. Junior houses a ~5.6 T REBCO high-temperature superconducting magnet in a 5.2 m vacuum chamber, with plasma heating achieved via < 50 kW of electron cyclotron resonance heating power. Importantly, this experiment integrates novel high temperature superconductor power supply technology on board the dipole magnet. Recently OpenStar has completed first experimental campaigns with the Junior experiment, achieving first plasmas in late 2024. Experiments conducted with the full levitated system are planned for 2025. This article provides an overview of the main results from these experiments and details improvements planned for future campaigns.