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Title: Supplemental ELM control in ITER through beryllium granule injection

Abstract

Injection of low-Z granules into high performance discharges on DIII-D has been shown to promptly trigger Edge Localized Modes (ELMs) providing high-Z impurity control without significant plasma degradation. The ability to provide ELM triggering over a range of injection and discharge parameters suggests that the mechanical introduction of granules can be considered as an additional method of impurity control in ITER. Utilizing a spherically symmetric vapor shielding model for granule ablation, benchmarked with impurity granule injections on DIII-D, we simulate the injection of beryllium granules into ITER baseline discharges. By comparing the granule induced ELM triggering size required for deuterium and non-fuel pellets on DIII-D and cross-correlating with a previously simulated JOREK calcuation of D pellet size required for ELM triggering in ITER, we estimate that a beryllium pellet of 1.5 mm diameter should provide reliable ELM triggering on ITER. This size pellet, delivered at 200 m/s should penetrate 3.5 cm past the separatrix, solidly within the H-mode steep gradient region, a location found to be advantageous for ELM triggering with minimal pellet size.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1529723
Alternate Identifier(s):
OSTI ID: 1506112
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Name: Nuclear Materials and Energy Journal Volume: 19 Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELM pacing; granule injection; beryllium

Citation Formats

Lunsford, R., Bortolon, A., Maingi, R., Mansfield, D. K., Nagy, A., Jackson, G. L., and Osborne, T. Supplemental ELM control in ITER through beryllium granule injection. Netherlands: N. p., 2019. Web. doi:10.1016/j.nme.2019.02.005.
Lunsford, R., Bortolon, A., Maingi, R., Mansfield, D. K., Nagy, A., Jackson, G. L., & Osborne, T. Supplemental ELM control in ITER through beryllium granule injection. Netherlands. doi:10.1016/j.nme.2019.02.005.
Lunsford, R., Bortolon, A., Maingi, R., Mansfield, D. K., Nagy, A., Jackson, G. L., and Osborne, T. Wed . "Supplemental ELM control in ITER through beryllium granule injection". Netherlands. doi:10.1016/j.nme.2019.02.005.
@article{osti_1529723,
title = {Supplemental ELM control in ITER through beryllium granule injection},
author = {Lunsford, R. and Bortolon, A. and Maingi, R. and Mansfield, D. K. and Nagy, A. and Jackson, G. L. and Osborne, T.},
abstractNote = {Injection of low-Z granules into high performance discharges on DIII-D has been shown to promptly trigger Edge Localized Modes (ELMs) providing high-Z impurity control without significant plasma degradation. The ability to provide ELM triggering over a range of injection and discharge parameters suggests that the mechanical introduction of granules can be considered as an additional method of impurity control in ITER. Utilizing a spherically symmetric vapor shielding model for granule ablation, benchmarked with impurity granule injections on DIII-D, we simulate the injection of beryllium granules into ITER baseline discharges. By comparing the granule induced ELM triggering size required for deuterium and non-fuel pellets on DIII-D and cross-correlating with a previously simulated JOREK calcuation of D pellet size required for ELM triggering in ITER, we estimate that a beryllium pellet of 1.5 mm diameter should provide reliable ELM triggering on ITER. This size pellet, delivered at 200 m/s should penetrate 3.5 cm past the separatrix, solidly within the H-mode steep gradient region, a location found to be advantageous for ELM triggering with minimal pellet size.},
doi = {10.1016/j.nme.2019.02.005},
journal = {Nuclear Materials and Energy},
number = C,
volume = 19,
place = {Netherlands},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.nme.2019.02.005

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Cited by: 2 works
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Works referencing / citing this record:

Modeling of Ablatant Deposition from Electromagnetically Driven Radiative Pellets for Disruption Mitigation Studies
journal, July 2019