Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on BT
Abstract
Here, in this paper, we investigate the role of the edge ion heat flux for transitions from L-mode to H-mode in Alcator C-Mod. Previous results from the ASDEX Upgrade tokamak indicated that a critical value of edge ion heat flux per particle is needed for the transition. Analysis of C-Mod data confirms this result. The edge ion heat flux is indeed found to increase linearly with density at given magnetic field and plasma current. Furthermore, the Alcator C-Mod data indicate that the edge ion heat flux at the L-H transition also increases with magnetic field. Combining the data from Alcator C-Mod and ASDEX Upgrade yields a general expression for the edge ion heat flux at the L-H transition. These results are discussed from the point of view of the possible physics mechanism of the L-H transition. They are also compared to the L-H power threshold scaling and an extrapolation for ITER is given.
- Authors:
-
[2];
[2];
[4];
[2];
- Vienna Univ. of Technology (Austria)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Max Planck Society, Garching (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Fircroft Engineering (United Kingdom)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Atomic Energy Community (Euratom)
- Contributing Org.:
- ASDEX Upgrade Team; Alcator C-Mod Team
- OSTI Identifier:
- 1895310
- Grant/Contract Number:
- FC02-99ER54512; SC0014264; 633053
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 5; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; L-H transition; Alcator C-Mod; power threshold
Citation Formats
Schmidtmayr, M., Hughes, J. W., Ryter, F., Wolfrum, E., Cao, N., Creely, A. J., Howard, N., Hubbard, A. E., Lin, Y., Reinke, M. L., Rice, J. E., Tolman, E. A., Wukitch, S., and Ma, Y. Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on BT. United States: N. p., 2018.
Web. doi:10.1088/1741-4326/aaaed0.
Schmidtmayr, M., Hughes, J. W., Ryter, F., Wolfrum, E., Cao, N., Creely, A. J., Howard, N., Hubbard, A. E., Lin, Y., Reinke, M. L., Rice, J. E., Tolman, E. A., Wukitch, S., & Ma, Y. Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on BT. United States. https://doi.org/10.1088/1741-4326/aaaed0
Schmidtmayr, M., Hughes, J. W., Ryter, F., Wolfrum, E., Cao, N., Creely, A. J., Howard, N., Hubbard, A. E., Lin, Y., Reinke, M. L., Rice, J. E., Tolman, E. A., Wukitch, S., and Ma, Y. Fri .
"Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on BT". United States. https://doi.org/10.1088/1741-4326/aaaed0. https://www.osti.gov/servlets/purl/1895310.
@article{osti_1895310,
title = {Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on BT},
author = {Schmidtmayr, M. and Hughes, J. W. and Ryter, F. and Wolfrum, E. and Cao, N. and Creely, A. J. and Howard, N. and Hubbard, A. E. and Lin, Y. and Reinke, M. L. and Rice, J. E. and Tolman, E. A. and Wukitch, S. and Ma, Y.},
abstractNote = {Here, in this paper, we investigate the role of the edge ion heat flux for transitions from L-mode to H-mode in Alcator C-Mod. Previous results from the ASDEX Upgrade tokamak indicated that a critical value of edge ion heat flux per particle is needed for the transition. Analysis of C-Mod data confirms this result. The edge ion heat flux is indeed found to increase linearly with density at given magnetic field and plasma current. Furthermore, the Alcator C-Mod data indicate that the edge ion heat flux at the L-H transition also increases with magnetic field. Combining the data from Alcator C-Mod and ASDEX Upgrade yields a general expression for the edge ion heat flux at the L-H transition. These results are discussed from the point of view of the possible physics mechanism of the L-H transition. They are also compared to the L-H power threshold scaling and an extrapolation for ITER is given.},
doi = {10.1088/1741-4326/aaaed0},
journal = {Nuclear Fusion},
number = 5,
volume = 58,
place = {United States},
year = {Fri Mar 02 00:00:00 EST 2018},
month = {Fri Mar 02 00:00:00 EST 2018}
}
Free Publicly Available Full Text
Publisher's Version of Record
Other availability
Search WorldCat to find libraries that may hold this journal
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.
Works referenced in this record:
High-accuracy characterization of the edge radial electric field at ASDEX Upgrade
journal, April 2013
- Viezzer, E.; Pütterich, T.; Conway, G. D.
- Nuclear Fusion, Vol. 53, Issue 5
Survey of the H-mode power threshold and transition physics studies in ASDEX Upgrade
journal, September 2013
- Ryter, F.; Rathgeber, S. K.; Barrera Orte, L.
- Nuclear Fusion, Vol. 53, Issue 11
Equilibrium analysis of current profiles in tokamaks
journal, June 1990
- Lao, L. L.; Ferron, J. R.; Groebner, R. J.
- Nuclear Fusion, Vol. 30, Issue 6
First results from Alcator‐C‐MOD*
journal, May 1994
- Hutchinson, I. H.; Boivin, R.; Bombarda, F.
- Physics of Plasmas, Vol. 1, Issue 5
L- to H-mode transitions at low density in ASDEX Upgrade
journal, December 2011
- Sauter, P.; Pütterich, T.; Ryter, F.
- Nuclear Fusion, Vol. 52, Issue 1
20 years of research on the Alcator C-Mod tokamaka)
journal, November 2014
- Greenwald, M.; Bader, A.; Baek, S.
- Physics of Plasmas, Vol. 21, Issue 11
First ohmic H modes in ALCATOR C-MOD
journal, July 1994
- Snipes, J. A.; Granetz, R. S.; Greenwald, M.
- Nuclear Fusion, Vol. 34, Issue 7
Thomson scattering upgrades on Alcator C-Mod
journal, March 2003
- Hughes, J. W.; Mossessian, D.; Zhurovich, K.
- Review of Scientific Instruments, Vol. 74, Issue 3
Numerical simulation of ion cyclotron waves in tokamak plasmas
journal, January 1999
- Brambilla, M.
- Plasma Physics and Controlled Fusion, Vol. 41, Issue 1
Linking the micro and macro: L-H transition dynamics and threshold physics
journal, March 2015
- Malkov, M. A.; Diamond, P. H.; Miki, K.
- Physics of Plasmas, Vol. 22, Issue 3
H mode power threshold database for ITER
journal, September 1996
- Snipes, J. A.; Granetz, R. S.; Greenwald, M.
- Nuclear Fusion, Vol. 36, Issue 9
Transport-driven scrape-off layer flows and the x-point dependence of the L-H power threshold in Alcator C-Mod
journal, May 2005
- LaBombard, B.; Rice, J. E.; Hubbard, A. E.
- Physics of Plasmas, Vol. 12, Issue 5
Diagnostic Systems on Alcator C-Mod
journal, April 2007
- Basse, N. P.; Dominguez, A.; Edlund, E. M.
- Fusion Science and Technology, Vol. 51, Issue 3
Wave-Particle Studies in the Ion Cyclotron and Lower Hybrid Ranges of Frequencies in Alcator C-Mod
journal, April 2007
- Bonoli, P. T.; Parker, R.; Wukitch, S. J.
- Fusion Science and Technology, Vol. 51, Issue 3
Edge radial electric field structure and its connections to H-mode confinement in Alcator C-Mod plasmas
journal, May 2009
- McDermott, R. M.; Lipschultz, B.; Hughes, J. W.
- Physics of Plasmas, Vol. 16, Issue 5
An emerging understanding of H‐mode discharges in tokamaks *
journal, July 1993
- Groebner, R. J.
- Physics of Fluids B: Plasma Physics, Vol. 5, Issue 7
Influence of high magnetic field on access to stationary H-modes and pedestal characteristics in Alcator C-Mod
journal, February 2018
- Tolman, E. A.; Hughes, J. W.; Wolfe, S. M.
- Nuclear Fusion, Vol. 58, Issue 4
H-mode access in the low density regime on JET
journal, March 2006
- Andrew, Y.; Sartori, R.; Righi, E.
- Plasma Physics and Controlled Fusion, Vol. 48, Issue 4
H-mode behavior induced by cross-field currents in a tokamak
journal, November 1989
- Taylor, R.; Brown, M.; Fried, B.
- Physical Review Letters, Vol. 63, Issue 21
Experimental evidence for the key role of the ion heat channel in the physics of the L–H transition
journal, May 2014
- Ryter, F.; Barrera Orte, L.; Kurzan, B.
- Nuclear Fusion, Vol. 54, Issue 8
Recent progress towards a physics-based understanding of the H-mode transition
journal, January 2016
- Tynan, G. R.; Cziegler, I.; Diamond, P. H.
- Plasma Physics and Controlled Fusion, Vol. 58, Issue 4
L–H transition studies on DIII-D to determine H-mode access for operational scenarios in ITER
journal, August 2011
- Gohil, P.; Evans, T. E.; Fenstermacher, M. E.
- Nuclear Fusion, Vol. 51, Issue 10
H-modes on Alcator C-Mod
journal, August 1996
- Snipes, J. A.; Hubbard, A. E.; Garnier, D. T.
- Plasma Physics and Controlled Fusion, Vol. 38, Issue 8
Overview of experimental results and code validation activities at Alcator C-Mod
journal, September 2013
- Greenwald, M.; Bader, A.; Baek, S.
- Nuclear Fusion, Vol. 53, Issue 10
Influence of sheared poloidal rotation on edge turbulence
journal, January 1990
- Biglari, H.; Diamond, P. H.; Terry, P. W.
- Physics of Fluids B: Plasma Physics, Vol. 2, Issue 1
X-ray imaging crystal spectroscopy for use in plasma transport research
journal, November 2012
- Reinke, M. L.; Podpaly, Y. A.; Bitter, M.
- Review of Scientific Instruments, Vol. 83, Issue 11
H-mode threshold and confinement in helium and deuterium in ASDEX Upgrade
journal, May 2009
- Ryter, F.; Pütterich, T.; Reich, M.
- Nuclear Fusion, Vol. 49, Issue 6
Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
journal, May 1997
- Burrell, K. H.
- Physics of Plasmas, Vol. 4, Issue 5
Theory of plasma transport in toroidal confinement systems
journal, April 1976
- Hinton, F. L.; Hazeltine, R. D.
- Reviews of Modern Physics, Vol. 48, Issue 2
The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
journal, June 2004
- Pankin, Alexei; McCune, Douglas; Andre, Robert
- Computer Physics Communications, Vol. 159, Issue 3
L–H power threshold studies in JET with Be/W and C wall
journal, January 2014
- Maggi, C. F.; Delabie, E.; Biewer, T. M.
- Nuclear Fusion, Vol. 54, Issue 2
Power requirement for accessing the H-mode in ITER
journal, July 2008
- Martin, Y. R.; Takizuka, T.; Group, the ITPA CDBM H-mode Threshold Data
- Journal of Physics: Conference Series, Vol. 123
The Alcator C-Mod Program
journal, April 2007
- Marmar, E. S.; Group, Alcator C-Mod
- Fusion Science and Technology, Vol. 51, Issue 3
Works referencing / citing this record:
Dependence of alpha-particle-driven Alfvén eigenmode linear stability on device magnetic field strength and consequences for next-generation tokamaks
journal, March 2019
- Tolman, E. A.; Loureiro, N. F.; Rodrigues, P.
- Nuclear Fusion, Vol. 59, Issue 4
Safety factor and turbulence dynamics dependence of the L-H power threshold on DIII-D
journal, June 2019
- Yan, Z.; Mckee, G. R.; Gohil, P.
- Physics of Plasmas, Vol. 26, Issue 6