Design of the Electromagnetic Particle Injector (EPI) for Tokamak Deployment

Raman, R.; Lunsford, R.; Rogers, J. A.; Brooks, A.; Maan, A.; Perkins, L.

doi:10.1109/tps.2024.3401113

Design of the Electromagnetic Particle Injector (EPI) for Tokamak Deployment

Journal Article · Wed May 29 00:00:00 EDT 2024 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/tps.2024.3401113· OSTI ID:2403053

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Univ. of Washington, Seattle, WA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Both predicting and controlling disruptions are critical and urgent issues for ITER as some disruptions with a short warning time may be unavoidable. For these cases, a rapid response disruption mitigation system (DMS) referred to as the electromagnetic particle injector (EPI) is being developed. The primary advantages of the EPI are its fast response time and high velocity, which have been demonstrated in offline experiments (Raman et al., 2021). The EPI is capable of accelerating a metallic sabot electromagnetically using a rail gun to the required velocities ( > 2 km/s) within 2 ms. Two high-field racetrack magnets able to generate fields over 2 T are positioned above and below the rails to permit high velocity at low rail currents, a requirement to minimize electrode erosion. At the end of the acceleration phase, a sabot capture mechanism retains the spent sabot inside the vacuum chamber that houses the EPI. At this point, it releases well-defined microspheres, or a shell pellet, of a radiative payload into the disrupting plasma. A remotely operated sabot loading system positioned behind the injector contains several pre-equipped sabots that can be loaded by an operator from the tokamak control room. The injector is interfaced to the tokamak through a guide tube attached to the front of the EPI vacuum chamber. Finally, the advantages of the EPI system over other DMSs under consideration are described in conjunction with the details of an EPI system designed for near-term test on an existing large tokamak.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0006757; AC02-09CH11466

OSTI ID:: 2403053

Journal Information:: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 9 Vol. 52; ISSN 0093-3813

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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EPI
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Design of the Electromagnetic Particle Injector (EPI) for Tokamak Deployment

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