Runaway electron dynamics in ITER disruptions with shattered pellet injections
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| Title: | Runaway electron dynamics in ITER disruptions with shattered pellet injections |
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| Authors: | Vallhagen, Oskar, 1997, Hanebring, Lise, 2001, Artola, F. J., Lehnen, M, Nardon, E, Fülöp, Tünde-Maria, 1970, Hoppe, Matthias, Newton, Sarah, 1981, Pusztai, Istvan, 1983 |
| Source: | Implementation of activities described in the Roadmap to Fusion during Horizon Europe through a joint programme of the members of the EUROfusion consortium Skenande elektroner i fusionsplasmor Extrema plasmautbrott Datadrivna optimala modeller för kinetiska dynamor Nuclear Fusion. 64(8) |
| Subject Terms: | ITER, plasma simulation, disruption mitigation, shattered pellet injection, runaway electron |
| Description: | This study systematically explores the parameter space of disruption mitigation through shattered pellet injection in ITER with a focus on runaway electron (RE) dynamics, using the disruption modeling tool Dream. The physics fidelity is considerably increased compared to previous studies, by e.g. using realistic magnetic geometry, resistive wall configuration, thermal quench onset criteria, as well as including additional effects, such as ion transport and enhanced RE transport during the thermal quench. The work aims to provide a fairly comprehensive coverage of experimentally feasible scenarios, considering plasmas representative of both non-activated and high-performance DT operation, different thermal quench onset criteria and transport levels, a wide range of hydrogen and neon quantities injected in one or two stages, and pellets with various characteristic shard sizes. Using a staggered injection scheme, with a pure hydrogen injection preceding a mixed hydrogen-neon injection, we find injection parameters leading to acceptable RE currents in all investigated discharges without activated runaway sources. Dividing the injection into two stages is found to significantly enhance the assimilation and minimize RE generation due to the hot-tail mechanism. However, while a staggered injection outperforms a single stage injection also in cases with radioactive RE sources, no cases with acceptable RE currents are found for a DT-plasma with a 15 MA plasma current. |
| File Description: | electronic |
| Access URL: | https://research.chalmers.se/publication/541920 https://research.chalmers.se/publication/544123 https://research.chalmers.se/publication/541781 https://research.chalmers.se/publication/544123/file/544123_Fulltext.pdf |
| Database: | SwePub |
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Nájsť tento článok vo Web of Science | Abstract: | This study systematically explores the parameter space of disruption mitigation through shattered pellet injection in ITER with a focus on runaway electron (RE) dynamics, using the disruption modeling tool Dream. The physics fidelity is considerably increased compared to previous studies, by e.g. using realistic magnetic geometry, resistive wall configuration, thermal quench onset criteria, as well as including additional effects, such as ion transport and enhanced RE transport during the thermal quench. The work aims to provide a fairly comprehensive coverage of experimentally feasible scenarios, considering plasmas representative of both non-activated and high-performance DT operation, different thermal quench onset criteria and transport levels, a wide range of hydrogen and neon quantities injected in one or two stages, and pellets with various characteristic shard sizes. Using a staggered injection scheme, with a pure hydrogen injection preceding a mixed hydrogen-neon injection, we find injection parameters leading to acceptable RE currents in all investigated discharges without activated runaway sources. Dividing the injection into two stages is found to significantly enhance the assimilation and minimize RE generation due to the hot-tail mechanism. However, while a staggered injection outperforms a single stage injection also in cases with radioactive RE sources, no cases with acceptable RE currents are found for a DT-plasma with a 15 MA plasma current. |
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| ISSN: | 00295515 17414326 |
| DOI: | 10.1088/1741-4326/ad54d7 |