Electromagnetic particle injector for fast time response disruption mitigation in tokamaks
Abstract
A novel, rapid time-response, disruption mitigation system referred to as the electromagnetic particle injector (EPI) is described. This method can accurately deliver the radiative payload to the plasma center on a <10 ms time scale, much faster, and deeper, than what can be achieved using conventional methods. The EPI system accelerates a sabot electromagnetically. The sabot is a metallic capsule that can be accelerated to desired velocities by an electromagnetic impeller. At the end of its acceleration, within 2 ms, the sabot will release a radiative payload, which is composed of low-z granules, or a shell pellet containing smaller pellets. The primary advantage of the EPI concept over gas propelled systems is its potential to meet short warning time scales, while accurately delivering the required particle size and materials at the velocities needed for achieving the required penetration depth in high power ITER-scale discharges for thermal and runaway current disruption mitigation. In conclusion, the present experimental tests from a prototype system have demonstrated the acceleration of a 3.2 g sabot to over 150 m s–1 within 1.5 ms, consistent with the calculations, giving some degree of confidence that larger ITER-scale injector can be developed.
- Authors:
-
[1];
[1];
[2];
- Univ. of Washington, Seattle, WA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1487262
- Grant/Contract Number:
- SC000675; AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 59; Journal Issue: 1; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EPI; DMS; disruption; particle injector; electromagnetic
Citation Formats
Raman, R., Lay, W. -S., Jarboe, T. R., Menard, J. E., and Ono, M. Electromagnetic particle injector for fast time response disruption mitigation in tokamaks. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aaf192.
Raman, R., Lay, W. -S., Jarboe, T. R., Menard, J. E., & Ono, M. Electromagnetic particle injector for fast time response disruption mitigation in tokamaks. United States. https://doi.org/10.1088/1741-4326/aaf192
Raman, R., Lay, W. -S., Jarboe, T. R., Menard, J. E., and Ono, M. Thu .
"Electromagnetic particle injector for fast time response disruption mitigation in tokamaks". United States. https://doi.org/10.1088/1741-4326/aaf192. https://www.osti.gov/servlets/purl/1487262.
@article{osti_1487262,
title = {Electromagnetic particle injector for fast time response disruption mitigation in tokamaks},
author = {Raman, R. and Lay, W. -S. and Jarboe, T. R. and Menard, J. E. and Ono, M.},
abstractNote = {A novel, rapid time-response, disruption mitigation system referred to as the electromagnetic particle injector (EPI) is described. This method can accurately deliver the radiative payload to the plasma center on a <10 ms time scale, much faster, and deeper, than what can be achieved using conventional methods. The EPI system accelerates a sabot electromagnetically. The sabot is a metallic capsule that can be accelerated to desired velocities by an electromagnetic impeller. At the end of its acceleration, within 2 ms, the sabot will release a radiative payload, which is composed of low-z granules, or a shell pellet containing smaller pellets. The primary advantage of the EPI concept over gas propelled systems is its potential to meet short warning time scales, while accurately delivering the required particle size and materials at the velocities needed for achieving the required penetration depth in high power ITER-scale discharges for thermal and runaway current disruption mitigation. In conclusion, the present experimental tests from a prototype system have demonstrated the acceleration of a 3.2 g sabot to over 150 m s–1 within 1.5 ms, consistent with the calculations, giving some degree of confidence that larger ITER-scale injector can be developed.},
doi = {10.1088/1741-4326/aaf192},
journal = {Nuclear Fusion},
number = 1,
volume = 59,
place = {United States},
year = {Thu Dec 13 00:00:00 EST 2018},
month = {Thu Dec 13 00:00:00 EST 2018}
}
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Modeling of Ablatant Deposition from Electromagnetically Driven Radiative Pellets for Disruption Mitigation Studies
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