Skip to Main content Skip to Navigation
New interface
Journal articles

Post-thermal-quench shattered pellet injection for runaway electron seed depletion in ITER

Abstract : The possibility of using shattered pellet injection after the thermal quench of an ITER disruption in order to deplete Runaway Electron (RE) seeds before they can substantially avalanche is studied. Analytical and numerical estimates of the required injection rate for shards to be able to penetrate into the forming RE beam and stop REs are given. How much material could be assimilated before the Current Quench (CQ) becomes too short is also estimated. It appears that, if hydrogen pellets were used, the required number of pellets to be injected during the CQ would be prohibitive, at least considering the present design of the ITER Disruption Mitigation System (DMS). For neon or argon, the required number of pellets, although large, might be within reach of the ITER DMS, but the assimilated fraction would have to be very small in order not to shorten the CQ excessively. This study suggests that other injection schemes, based for example on small tungsten pellets coated with a low Z material, may be worth exploring as an option for an upgrade of the ITER DMS.
Complete list of metadata

https://hal-cea.archives-ouvertes.fr/cea-03539301
Contributor : valerie icard Connect in order to contact the contributor
Submitted on : Friday, January 21, 2022 - 3:40:41 PM
Last modification on : Saturday, January 22, 2022 - 3:14:59 AM
Long-term archiving on: : Friday, April 22, 2022 - 8:17:55 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2023-01-21

Please log in to resquest access to the document

Identifiers

  • HAL Id : cea-03539301, version 1

Collections

Citation

E. Nardon, A. Matsuyama, D. Hu, F. Wieschollek. Post-thermal-quench shattered pellet injection for runaway electron seed depletion in ITER. Nuclear Fusion, In press, 62, pp.026003. ⟨cea-03539301⟩

Share

Metrics

Record views

31