Design and initial results from the “Junior” Levitated Dipole Experiment
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.
Authors
- L. Meadows (ORCID: https://orcid.org/0009-0002-3371-5689)
- Thomas Berry (ORCID: https://orcid.org/0000-0002-0314-4136)
- Rodney A. Badcock (ORCID: https://orcid.org/0000-0003-0219-9570)
- P. Coulson (ORCID: https://orcid.org/0009-0003-7577-7455)
- Ningchuang Zhou (ORCID: https://orcid.org/0009-0003-4317-8087)
- Alex Simpson (ORCID: https://orcid.org/0000-0002-1763-3563)
- E. Stiers
- Jr. Todd (ORCID: https://orcid.org/0009-0009-0566-8054)
- A. Sharma (ORCID: https://orcid.org/0009-0003-5877-720X)
- Ratu Mataira (ORCID: https://orcid.org/0000-0003-0892-5430)
- R. Hu (ORCID: https://orcid.org/0009-0004-6342-2769)
- Mohammad Siamaki (ORCID: https://orcid.org/0000-0001-5498-2570)
- James H.P. RICE (ORCID: https://orcid.org/0000-0002-2164-6586)
- Mark Buchanan
- Matthew Lynch (ORCID: https://orcid.org/0009-0001-0057-7307)
- B. Leuw (ORCID: https://orcid.org/0000-0003-0775-756X)
- D. Garnier (ORCID: https://orcid.org/0000-0002-0718-1073)
- T. Simpson (ORCID: https://orcid.org/0009-0000-9089-309X)
- H.W. Weijers (ORCID: https://orcid.org/0000-0002-6630-5048)
- Jennifer Tyler (ORCID: https://orcid.org/0009-0006-9645-8658)
- Kent Hamilton (ORCID: https://orcid.org/0000-0003-3284-5262)
- Jerrine R. Morris (ORCID: https://orcid.org/0009-0009-5769-1379)
- C. S. Chisholm (ORCID: https://orcid.org/0000-0002-5599-0158)
- Sriharsha Venuturumilli (ORCID: https://orcid.org/0000-0001-7677-8714)
- Joshua Purvis (ORCID: https://orcid.org/0000-0003-4585-9823)
- Konstantinos Bouloukakis (ORCID: https://orcid.org/0000-0003-4315-5021)
- Gabriel Bioletti (ORCID: https://orcid.org/0000-0001-6317-3310)
- Robert C. Davidson (ORCID: https://orcid.org/0009-0006-3045-4910)
- Edward Hunter (ORCID: https://orcid.org/0009-0002-0870-9746)
- J.P. Jones (ORCID: https://orcid.org/0009-0003-1699-3182)
- B. Smith (ORCID: https://orcid.org/0009-0001-1359-4632)
- Emily-Kei C. Brewerton (ORCID: https://orcid.org/0009-0007-7236-649X)
- Theo Wordsworth (ORCID: https://orcid.org/0009-0005-1534-306X)
- P. Kusay (ORCID: https://orcid.org/0009-0000-4209-5720)
- R. Nowacki (ORCID: https://orcid.org/0009-0006-0116-3452)
- E.V.W. Chambers (ORCID: https://orcid.org/0009-0000-1093-3849)
- K.B. Chappell (ORCID: https://orcid.org/0009-0006-4071-9601)
- M. Rutten (ORCID: https://orcid.org/0009-0000-4821-4866)
- E. Swanson-Dobbs (ORCID: https://orcid.org/0009-0008-2217-194X)
- P.J. Burt (ORCID: https://orcid.org/0009-0001-7509-9573)
- Z. Lazić (ORCID: https://orcid.org/0009-0003-4415-0174)
- M. McCrohon
- E.O.P. Treacher (ORCID: https://orcid.org/0009-0007-5828-8819)
- J.P.M. Ellingham (ORCID: https://orcid.org/0009-0007-7141-4680)
- S. Schimanski (ORCID: https://orcid.org/0009-0001-6902-8437)
- P. Geursen (ORCID: https://orcid.org/0009-0003-4563-9780)
Publication Details
- Journal
- Fusion Engineering and Design
- Published
- 2025-12-02
- DOI
- https://doi.org/10.1016/j.fusengdes.2025.115551
- Citations
- 4
- Primary Topic
- Superconducting Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.70