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:
- Journal Article: 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. https://doi.org/10.1016/j.nme.2019.02.005
Lunsford, R., Bortolon, A., Maingi, R., Mansfield, D. K., Nagy, A., Jackson, G. L., and Osborne, T. 2019.
"Supplemental ELM control in ITER through beryllium granule injection". Netherlands. https://doi.org/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},
url = {https://www.osti.gov/biblio/1529723},
journal = {Nuclear Materials and Energy},
issn = {2352-1791},
number = C,
volume = 19,
place = {Netherlands},
year = {Wed May 01 00:00:00 EDT 2019},
month = {Wed May 01 00:00:00 EDT 2019}
}
Web of Science
Works referencing / citing this record:
Modeling of Ablatant Deposition from Electromagnetically Driven Radiative Pellets for Disruption Mitigation Studies
journal, July 2019
- Lunsford, Robert; Raman, Roger; Brooks, A.
- Fusion Science and Technology, Vol. 75, Issue 8
Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection
journal, October 2019
- Lunsford, R.; Rohde, V.; Bortolon, A.
- Nuclear Fusion, Vol. 59, Issue 12