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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:
 [1];  [1];  [1];  [1];  [1];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1506112
Grant/Contract Number:  
FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 19; Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
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. United States: 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. United States. 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. Thu . "Supplemental ELM control in ITER through beryllium granule injection". United States. doi:10.1016/j.nme.2019.02.005. https://www.osti.gov/servlets/purl/1506112.
@article{osti_1506112,
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 = {United States},
year = {2019},
month = {2}
}

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