Rotational shear effects on edge harmonic oscillations in DIII-D quiescent H-mode discharges
Abstract
In the quiescent H-mode (QH-mode) regime, edge harmonic oscillations (EHO) play an important role in avoiding transient edge localized mode (ELM) power fluxes by providing benign and continuous edge particle transport. A detailed theoretical, experimental and modeling comparison has been made of low-n (n ≤ 5) EHO in DIII-D QH-mode plasmas. The calculated linear eigenmode structure from the extended MHD code M3D-C1 matches closely the coherent EHO properties from external magnetics data and internal measurements using the ECE, BES, ECE-Imaging and microwave imaging reflectometer (MIR) diagnostics, as well as the kink/peeling mode properties found by the ideal MHD code ELITE. Numerical investigations indicate that the low-n EHO-like solutions from M3D-C1 are destabilized by the rotational shear while high-n modes are stabilized. This effect is independent of the rotation direction, suggesting that EHO can be destabilized in principle with rotation in either direction. Furthermore, the modeling results are consistent with observations of the EHO, support the proposed theory of the EHO as a rotational shear driven kink/peeling mode, and improve our understanding and confidence in creating and sustaining QH-mode in present and future devices.
- Authors:
-
- General Atomics, San Diego, CA (United States)
- Univ. of Texas, Austin, TX (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of California, Davis, CA (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1351092
- Alternate Identifier(s):
- OSTI ID: 1258301
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH11466; FG03-97ER54415; FG02-99ER54531; FG02-08ER54999
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 7; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; QH-mode; DIII-D; EHO; M3D-C1; rotational shear; ELM control; E×B shear
Citation Formats
Chen, Xi, Burrell, Keith H., Ferraro, Nathaniel M., Osborne, Thomas H., Austin, Max E., Garofalo, Andrea M., Groebner, Richard J., Kramer, Gerrit J., Luhmann, Jr., Neville C., McKee, George R., Muscatello, C. M., Nazikian, R., Ren, X., Snyder, P. B., Solomon, W. M., Tobias, B. J., and Yan, Z. Rotational shear effects on edge harmonic oscillations in DIII-D quiescent H-mode discharges. United States: N. p., 2016.
Web. doi:10.1088/0029-5515/56/7/076011.
Chen, Xi, Burrell, Keith H., Ferraro, Nathaniel M., Osborne, Thomas H., Austin, Max E., Garofalo, Andrea M., Groebner, Richard J., Kramer, Gerrit J., Luhmann, Jr., Neville C., McKee, George R., Muscatello, C. M., Nazikian, R., Ren, X., Snyder, P. B., Solomon, W. M., Tobias, B. J., & Yan, Z. Rotational shear effects on edge harmonic oscillations in DIII-D quiescent H-mode discharges. United States. https://doi.org/10.1088/0029-5515/56/7/076011
Chen, Xi, Burrell, Keith H., Ferraro, Nathaniel M., Osborne, Thomas H., Austin, Max E., Garofalo, Andrea M., Groebner, Richard J., Kramer, Gerrit J., Luhmann, Jr., Neville C., McKee, George R., Muscatello, C. M., Nazikian, R., Ren, X., Snyder, P. B., Solomon, W. M., Tobias, B. J., and Yan, Z. Tue .
"Rotational shear effects on edge harmonic oscillations in DIII-D quiescent H-mode discharges". United States. https://doi.org/10.1088/0029-5515/56/7/076011. https://www.osti.gov/servlets/purl/1351092.
@article{osti_1351092,
title = {Rotational shear effects on edge harmonic oscillations in DIII-D quiescent H-mode discharges},
author = {Chen, Xi and Burrell, Keith H. and Ferraro, Nathaniel M. and Osborne, Thomas H. and Austin, Max E. and Garofalo, Andrea M. and Groebner, Richard J. and Kramer, Gerrit J. and Luhmann, Jr., Neville C. and McKee, George R. and Muscatello, C. M. and Nazikian, R. and Ren, X. and Snyder, P. B. and Solomon, W. M. and Tobias, B. J. and Yan, Z.},
abstractNote = {In the quiescent H-mode (QH-mode) regime, edge harmonic oscillations (EHO) play an important role in avoiding transient edge localized mode (ELM) power fluxes by providing benign and continuous edge particle transport. A detailed theoretical, experimental and modeling comparison has been made of low-n (n ≤ 5) EHO in DIII-D QH-mode plasmas. The calculated linear eigenmode structure from the extended MHD code M3D-C1 matches closely the coherent EHO properties from external magnetics data and internal measurements using the ECE, BES, ECE-Imaging and microwave imaging reflectometer (MIR) diagnostics, as well as the kink/peeling mode properties found by the ideal MHD code ELITE. Numerical investigations indicate that the low-n EHO-like solutions from M3D-C1 are destabilized by the rotational shear while high-n modes are stabilized. This effect is independent of the rotation direction, suggesting that EHO can be destabilized in principle with rotation in either direction. Furthermore, the modeling results are consistent with observations of the EHO, support the proposed theory of the EHO as a rotational shear driven kink/peeling mode, and improve our understanding and confidence in creating and sustaining QH-mode in present and future devices.},
doi = {10.1088/0029-5515/56/7/076011},
journal = {Nuclear Fusion},
number = 7,
volume = 56,
place = {United States},
year = {Tue Jun 21 00:00:00 EDT 2016},
month = {Tue Jun 21 00:00:00 EDT 2016}
}
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