Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D
Recent DIII-D experiments in the ITER Baseline Scenario (IBS) have shown strong increases in fluctuations and correlated reduction of confinement associated with entering the electron-heating-dominated regime with strong electron cyclotron heating (ECH). The addition of 3.2 MW of 110 GHz EC power de...
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| Format: | Article |
| Language: | en_US |
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EDP Sciences
2015
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| Online Access: | http://hdl.handle.net/1721.1/98290 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0003-1004-5782 |
| _version_ | 1826196262116917248 |
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| author | Schmitz, L. Taylor, G. Turco, F. Pinsker, R. I. Austin, M. E. Ernst, Darin R. Garofalo, A. M. Grierson, B. A. Hosea, J. C. Luce, T. C. Marinoni, Alessandro McKee, G. R. Perkins, R. J. Petty, C. C. Porkolab, Miklos Rost, Jon C. Solomon, W. M. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Schmitz, L. Taylor, G. Turco, F. Pinsker, R. I. Austin, M. E. Ernst, Darin R. Garofalo, A. M. Grierson, B. A. Hosea, J. C. Luce, T. C. Marinoni, Alessandro McKee, G. R. Perkins, R. J. Petty, C. C. Porkolab, Miklos Rost, Jon C. Solomon, W. M. |
| author_sort | Schmitz, L. |
| collection | MIT |
| description | Recent DIII-D experiments in the ITER Baseline Scenario (IBS) have shown strong increases in fluctuations and correlated reduction of confinement associated with entering the electron-heating-dominated regime with strong electron cyclotron heating (ECH). The addition of 3.2 MW of 110 GHz EC power deposited at ρ~0.42 to IBS discharges with ~3 MW of neutral beam injection causes large increases in low-k and medium-k turbulent density fluctuations observed with Doppler backscatter (DBS), beam emission spectroscopy (BES) and phase-contrast imaging (PCI) diagnostics, correlated with decreases in the energy, particle, and momentum confinement times. Power balance calculations show the electron heat diffusivity χ[subscript e] increases significantly in the mid-radius region 0.4<ρ<0.8, which is roughly the same region where the DBS and BES diagnostics show the increases in turbulent density fluctuations. Confinement of angular momentum is also reduced during ECH. Studies with the TGYRO transport solver show that the model of turbulent transport embodied in the TGLF code quantitatively reproduces the measured transport in both the neutral beam (NB)-only and in the NB plus EC cases. A simple model of the decrease in toroidal rotation with EC power is set forth, which exhibits a bifurcation in the rotational state of the discharge. |
| first_indexed | 2024-09-23T10:24:07Z |
| format | Article |
| id | mit-1721.1/98290 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:24:07Z |
| publishDate | 2015 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/982902022-09-30T20:51:31Z Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D Schmitz, L. Taylor, G. Turco, F. Pinsker, R. I. Austin, M. E. Ernst, Darin R. Garofalo, A. M. Grierson, B. A. Hosea, J. C. Luce, T. C. Marinoni, Alessandro McKee, G. R. Perkins, R. J. Petty, C. C. Porkolab, Miklos Rost, Jon C. Solomon, W. M. Massachusetts Institute of Technology. Department of Physics Ernst, Darin R. Marinoni, Alessandro Porkolab, Miklos Rost, Jon C. Recent DIII-D experiments in the ITER Baseline Scenario (IBS) have shown strong increases in fluctuations and correlated reduction of confinement associated with entering the electron-heating-dominated regime with strong electron cyclotron heating (ECH). The addition of 3.2 MW of 110 GHz EC power deposited at ρ~0.42 to IBS discharges with ~3 MW of neutral beam injection causes large increases in low-k and medium-k turbulent density fluctuations observed with Doppler backscatter (DBS), beam emission spectroscopy (BES) and phase-contrast imaging (PCI) diagnostics, correlated with decreases in the energy, particle, and momentum confinement times. Power balance calculations show the electron heat diffusivity χ[subscript e] increases significantly in the mid-radius region 0.4<ρ<0.8, which is roughly the same region where the DBS and BES diagnostics show the increases in turbulent density fluctuations. Confinement of angular momentum is also reduced during ECH. Studies with the TGYRO transport solver show that the model of turbulent transport embodied in the TGLF code quantitatively reproduces the measured transport in both the neutral beam (NB)-only and in the NB plus EC cases. A simple model of the decrease in toroidal rotation with EC power is set forth, which exhibits a bifurcation in the rotational state of the discharge. United States. Dept. of Energy (DE-FC02-04ER54698) United States. Dept. of Energy (DE-FC02-08ER54966) United States. Dept. of Energy (DE-AC03-09CH11466) United States. Dept. of Energy (DE-FG02-04ER54235) United States. Dept. of Energy (DE-FG0289ER53296) United States. Dept. of Energy (DE-FG02-08ER54999) United States. Dept. of Energy (DE-FG02-08ER54984) United States. Dept. of Energy (DE-FG02-04ER54461) 2015-09-01T15:36:43Z 2015-09-01T15:36:43Z 2015-03 Article http://purl.org/eprint/type/ConferencePaper 2100-014X http://hdl.handle.net/1721.1/98290 Pinsker, R.I., M.E. Austin, D.R. Ernst, A.M. Garofalo, B.A. Grierson, J.C. Hosea, T.C. Luce, et al. “Application of ECH to the Study of Transport in ITER Baseline Scenario-Like Discharges in DIII-D.” Edited by S. Kubo. EPJ Web of Conferences 87 (2015): 02003. https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0003-1004-5782 en_US http://dx.doi.org/10.1051/epjconf/20158702003 EPJ Web of Conferences Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf EDP Sciences EPJ Web of Conferences |
| spellingShingle | Schmitz, L. Taylor, G. Turco, F. Pinsker, R. I. Austin, M. E. Ernst, Darin R. Garofalo, A. M. Grierson, B. A. Hosea, J. C. Luce, T. C. Marinoni, Alessandro McKee, G. R. Perkins, R. J. Petty, C. C. Porkolab, Miklos Rost, Jon C. Solomon, W. M. Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D |
| title | Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D |
| title_full | Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D |
| title_fullStr | Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D |
| title_full_unstemmed | Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D |
| title_short | Application of ECH to the Study of Transport in ITER Baseline Scenario-like Discharges in DIII-D |
| title_sort | application of ech to the study of transport in iter baseline scenario like discharges in diii d |
| url | http://hdl.handle.net/1721.1/98290 https://orcid.org/0000-0002-9518-4097 https://orcid.org/0000-0003-1004-5782 |
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