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Title: 20 years of research on the Alcator C-Mod tokamak

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4901920· OSTI ID:1546775
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  1. MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA
  2. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
  3. UCLA, Institute of Plasma and Fusion Research, Los Angeles, California 90095, USA
  4. Fusion Research Center, University of Texas, Austin, Texas 78712, USA
  5. General Atomics, P.O. Box 85608, San Diego, California 92186, USA
  6. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
  7. Center for Momentum Transport and Flow Organization, UCSD, San Diego, California 92093, USA
  8. Ecole Polytechnique Federale de Lausanne, Centre de Recherches en Physique des Plasmas, Lausanne 1015, Switzerland
  9. Department of Physics and Technology, University of Tromsø, N-9037 Tromsø, Norway
  10. MPI for Plasma Physics, EURATOM Association, D-17491 Greifswald, Germany and Ernst-Moritz-Arndt University, D-17489 Greifswald, Germany
  11. Energetiq Technology, 7 Constitution Way, Woburn, Massachusetts 01801, USA
  12. Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, Tennessee 37830, USA
  13. ORNL, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA
  14. York University, Heslington, York YO10 5DD, United Kingdom
  15. ITER Organization, 13067 St. Paul-lez-Durance, France
  16. Block Engineering, 377 Simarano Dr., Marlborough, Massachusetts 01752, USA
  17. UKAEA Culham Centre for Fusion Energy, Abingdon, OX14 3DB Oxfordshire, United Kingdom
  18. MPI für Plasmaphysik, EURATOM-Association, D-85748 Garching, Germany
  19. AllianceBernstein, 1345 Avenue of the Americas, New York, New York 10105, USA
  20. Lodestar Research Corporation, 2400 Central Avenue P-5, Boulder, Colorado 80301, USA
  21. Raytheon Co., 1151 E Hermans Rd., Tucson, Arizona 85756, USA
  22. McKinsey & Co., 110 Charles Street West, Toronto, Ontario M5S 1K9, Canada
  23. National Institute of Science and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, Maryland 20899, USA
  24. LLNL, 7000 East Ave., Livermore, California 94550, USA
  25. GT Advanced Technologies, 243 Daniel Webster Highway, Merrimack, New Hampshire 03054, USA
  26. University of Tokyo, Tokyo 113-033, Japan
  27. Facebook LLC, 1601 Willow Road, Menlo Park, California 94205, USA

The object of this review is to summarize the achievements of research on the Alcator C-Mod tokamak [Hutchinson et al., Phys. Plasmas 1, 1511 (1994) and Marmar, Fusion Sci. Technol. 51, 261 (2007)] and to place that research in the context of the quest for practical fusion energy. C-Mod is a compact, high-field tokamak, whose unique design and operating parameters have produced a wealth of new and important results since it began operation in 1993, contributing data that extends tests of critical physical models into new parameter ranges and into new regimes. Using only high-power radio frequency (RF) waves for heating and current drive with innovative launching structures, C-Mod operates routinely at reactor level power densities and achieves plasma pressures higher than any other toroidal confinement device. C-Mod spearheaded the development of the vertical-target divertor and has always operated with high-Z metal plasma facing components—approaches subsequently adopted for ITER. C-Mod has made ground-breaking discoveries in divertor physics and plasma-material interactions at reactor-like power and particle fluxes and elucidated the critical role of cross-field transport in divertor operation, edge flows and the tokamak density limit. C-Mod developed the I-mode and the Enhanced Dα H-mode regimes, which have high performance without large edge localized modes and with pedestal transport self-regulated by short-wavelength electromagnetic waves. C-Mod has carried out pioneering studies of intrinsic rotation and demonstrated that self-generated flow shear can be strong enough in some cases to significantly modify transport. C-Mod made the first quantitative link between the pedestal temperature and the H-mode's performance, showing that the observed self-similar temperature profiles were consistent with critical-gradient-length theories and followed up with quantitative tests of nonlinear gyrokinetic models. RF research highlights include direct experimental observation of ion cyclotron range of frequency (ICRF) mode-conversion, ICRF flow drive, demonstration of lower-hybrid current drive at ITER-like densities and fields and, using a set of novel diagnostics, extensive validation of advanced RF codes. Disruption studies on C-Mod provided the first observation of non-axisymmetric halo currents and non-axisymmetric radiation in mitigated disruptions. Lastly, a summary of important achievements and discoveries are included.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Contributing Organization:
Alcator Collaborators; C-Mod Team
Grant/Contract Number:
FC02-99ER54512; AC02-78ET-51013
OSTI ID:
1546775
Alternate ID(s):
OSTI ID: 1224325
Journal Information:
Physics of Plasmas, Vol. 21, Issue 11; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Evidence for electromagnetic fluid drift turbulence controlling the edge plasma state in the Alcator C-Mod tokamak journal November 2005
Characterization of the onset of ion cyclotron parametric decay instability of lower hybrid waves in a diverted tokamak journal June 2014
Verification and validation for magnetic fusion journal May 2010
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Modelling of ELM-averaged power exhaust on JET using the EDGE2D code with variable transport coefficients journal April 2007
Ultrahigh resolution simulations of mode converted ion cyclotron waves and lower hybrid waves journal December 2004
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External excitation of a short-wavelength fluctuation in the Alcator C-Mod edge plasma and its relationship to the quasi-coherent mode journal May 2014
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A study of tungsten migration in the Alcator C-Mod divertor journal August 2011
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Mitigation of radio frequency sheaths through magnetic field-aligned ICRF antenna design journal September 2012
Fullwave Simulations of Lower Hybrid Waves Coupled to 3D Fokker-Planck Solver: Comparison with Alcator C-Mod Experiment journal July 2011
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Observations of anomalous momentum transport in Alcator C-Mod plasmas with no momentum input journal February 2004
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Detection of lower hybrid waves in the scrape-off layer of tokamak plasmas with microwave backscattering journal January 2014
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X-ray observations of central toroidal rotation in ohmic Alcator C-Mod plasmas journal March 1997
The quasi-coherent signature of enhanced D α H-mode in Alcator C-Mod journal March 2001
Evidence of halo currents in JET conference January 1992
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Runaway electron confinement modelling for rapid shutdown scenarios in DIII-D, Alcator C-Mod and ITER journal May 2011
RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities journal January 2008
Characterization of impurity confinement on Alcator C-Mod using a multi-pulse laser blow-off system journal March 2011
ICRF specific impurity sources and plasma sheaths in Alcator C-Mod journal June 2009
Characterization of enhanced Dα high-confinement modes in Alcator C -Mod journal May 1999
Overview of experimental results and code validation activities at Alcator C-Mod journal September 2013
Role of trapped electron mode turbulence in internal transport barrier control in the Alcator C-Mod Tokamak journal May 2004
Scalings for tokamak energy confinement journal October 1990
Fuel retention measurements in Alcator C-Mod using accelerator-based in situ materials surveillance journal August 2015
Neutrals Studies on Alcator C-Mod journal April 2007
Experimental studies of edge turbulence and confinement in Alcator C-Mod journal May 2010
Physics of non-diffusive turbulent transport of momentum and the origins of spontaneous rotation in tokamaks journal March 2009
Advances in measurement and modeling of the high-confinement-mode pedestal on the Alcator C-Mod tokamak journal May 2006
Observations and empirical scalings of the high-confinement mode pedestal on Alcator C-Mod journal July 2002
Internal Transport Barriers in Alcator C-Mod journal April 2007
H-Mode Pedestal and L-H Transition Studies on Alcator C-Mod journal April 2007
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Experimental validation of similarity in high-temperature plasmas journal September 2002
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Vacuum ultraviolet impurity spectroscopy on the Alcator C-Mod tokamak journal October 2010
The relation between impurity neutral and impurity ion compression in the Alcator C-Mod divertor journal December 2001
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Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L -Mode Plasmas journal December 2011
Quantitative comparison of experimental impurity transport with nonlinear gyrokinetic simulation in an Alcator C-Mod L-mode plasma journal April 2012
Multi-scale gyrokinetic simulation of Alcator C-Mod tokamak discharges journal March 2014
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Effects of Magnetic Shear on Toroidal Rotation in Tokamak Plasmas with Lower Hybrid Current Drive journal September 2013
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The EPED pedestal model and edge localized mode-suppressed regimes: Studies of quiescent H-mode and development of a model for edge localized mode suppression via resonant magnetic perturbations journal May 2012
Transitions of turbulence in plasma density limits journal May 2003
The dependence of core rotation on magnetic configuration and the relation to the H-mode power threshold in Alcator C-Mod plasmas with no momentum input journal March 2005
Influence of boronization on operation with high-Z plasma facing components in Alcator C-Mod journal June 2007
Reactor similarity for plasma–material interactions in scaled-down tokamaks as the basis for the Vulcan conceptual design journal March 2012
Spatial structure of scrape-off-layer filaments near the midplane and X-point regions of Alcator-C-Mod journal June 2009
Edge-localized mode avoidance and pedestal structure in I-mode plasmas journal May 2014
Measurements of ion cyclotron range of frequencies mode converted wave intensity with phase contrast imaging in Alcator C-Mod and comparison with full-wave simulations journal August 2012
Changes in core electron temperature fluctuations across the ohmic energy confinement transition in Alcator C-Mod plasmas journal July 2013
Radiofrequency-heated enhanced confinement modes in the Alcator C-Mod tokamak journal May 1997
Beyond benchmarking—how experiments and simulations can work together in plasma physics journal December 2004
Suppression of turbulence and transport by sheared flow journal January 2000
Characterization of the pedestal in Alcator C-Mod ELMing H-modes and comparison with the EPED model journal April 2012
Effects of ICRF power on SOL density profiles and LH coupling during simultaneous LH and ICRF operation on Alcator C-Mod journal July 2013
Plasma-material interactions in current tokamaks and their implications for next step fusion reactors journal December 2001
Obtaining reactor-relevant divertor conditions in tokamaks journal April 2011
Edge turbulence imaging in the Alcator C-Mod tokamak journal May 2002
ICRF mode conversion flow drive on Alcator C-Mod journal April 2011
Full wave effects on the lower hybrid wave spectrum and driven current profile in tokamak plasmas journal August 2011
Double transport barrier plasmas in Alcator C-Mod journal May 2002
Neutral particle dynamics in the Alcator C-Mod tokamak journal February 1997
Visible imaging of turbulence in the SOL of the Alcator C-Mod tokamak journal March 2001
An international database for the study of the formation of ITBs in tokamaks journal April 2002
Review of Tokamak plasma heating by wave damping in the ion cyclotron range of frequency journal April 1987
Critical gradients and plasma flows in the edge plasma of Alcator C-Mod journal May 2008
Self-Acceleration of a Tokamak Plasma during Ohmic H Mode journal April 2000
Modeling far-field radio-frequency sheaths in Alcator C-Mod journal May 2013
Edge Temperature Gradient as Intrinsic Rotation Drive in Alcator C -Mod Tokamak Plasmas journal May 2011
Relativistic limitations on runaway electrons journal June 1975
Magnetohydrodynamic simulations of massive gas injection into Alcator C-Mod and DIII-D plasmas journal May 2008
H-mode power threshold reduction in a slot-divertor configuration on the Alcator C-Mod tokamak journal June 2012
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Electron temperature fluctuations associated with the weakly coherent mode in the edge of I-mode plasmas journal October 2011
Magnetohydrodynamic stability of tokamak edge plasmas journal July 1998
Time dependent evolution of RF-generated non-thermal particle distributions in fusion plasmas journal March 2014
ICRF Performance with Metallic Plasma Facing Components in Alcator C-Mod
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conference January 2007
Effects of LHRF on toroidal rotation in Alcator C-Mod plasmas journal August 2013
Plasma wave simulation based on a versatile finite element method solver journal May 2010
Scaling of the power exhaust channel in Alcator C-Mod journal May 2011
Design, and initial experiment results of a novel LH launcher on Alcator C-Mod journal September 2011
Waves in plasmas: Highlights from the past and present journal August 1990
Pedestal structure and stability in H-mode and I-mode: a comparative study on Alcator C-Mod journal March 2013
Non-neoclassical up/down asymmetry of impurity emission on Alcator C-Mod journal March 2013
Alcator DCT: Heat removal and impurity control in a proposed long pulse tokamak journal May 1984
Variation of edge gradients with heat flux across L-H and H-L transitions in Alcator C-Mod journal April 2002
Scaling of H-mode threshold power and L–H edge conditions with favourable ion grad- B drift in Alcator C-Mod tokamak journal January 2012
Ion cyclotron range of frequencies mode conversion electron heating in deuterium–hydrogen plasmas in the Alcator C-Mod tokamak journal May 2003
Observation and modelling of ion cyclotron range of frequencies waves in the mode conversion region of Alcator C-Mod journal July 2005
Characteristics of type I ELM energy and particle losses in existing devices and their extrapolation to ITER journal August 2003
Assessment of erosion of the ITER divertor targets during type I ELMs journal August 2003
An in situ accelerator-based diagnostic for plasma-material interactions science on magnetic fusion devices journal December 2013
Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas journal May 2012
X-ray observations of up-down impurity density asymmetries in Alcator C-Mod plasmas journal February 1997
Volume recombination and opacity in Alcator C-Mod divertor plasmas journal May 1998
Control of internal transport barriers on Alcator C-Mod journal May 2004
A study of molybdenum influxes and transport in Alcator C-Mod journal May 2001
Improved understanding of physics processes in pedestal structure, leading to improved predictive capability for ITER journal August 2013
L-mode validation studies of gyrokinetic turbulence simulations via multiscale and multifield turbulence measurements on the DIII-D tokamak journal May 2011
An ITPA joint experiment to study runaway electron generation and suppression journal July 2014
Impurity transport in Alcator C-Mod plasmas journal May 1997
Impurity transport, turbulence transitions and intrinsic rotation in Alcator C-Mod plasmas journal November 2014
Observation of Edge Instability Limiting the Pedestal Growth in Tokamak Plasmas journal March 2014
I. Burning Plasma Experiment Physics Design Description journal May 1992
Residual parallel Reynolds stress due to turbulence intensity gradient in tokamak plasmas journal November 2010
Numerical simulation of ion cyclotron waves in tokamak plasmas journal January 1999
Absorption of lower hybrid waves in the scrape off layer of a diverted tokamak journal August 2010
Momentum transport studies from multi-machine comparisons journal November 2012
Scaling of density peaking in H-mode plasmas based on a combined database of AUG and JET observations journal August 2007
Impurity compression and enrichment studies on Alcator C-Mod journal March 1999
Investigation of the transport shortfall in Alcator C-Mod L-mode plasmas journal March 2013
Effect of neutral transport on ITER divertor performance journal June 2005
Non-local heat transport, rotation reversals and up/down impurity density asymmetries in Alcator C-Mod ohmic L-mode plasmas journal February 2013
Experiences With Tungsten Plasma Facing Components in ASDEX Upgrade and JET journal March 2014
Study of Ion Cyclotron Range of Frequencies Mode Conversion in the Alcator C-Mod Tokamak
  • Lin, Y.
  • RADIO FREQUENCY POWER IN PLASMAS: 15th Topical Conference on Radio Frequency Power in Plasmas, AIP Conference Proceedings https://doi.org/10.1063/1.1637995
conference January 2003
A review of zonal flow experiments journal December 2008
High-confinement-mode edge stability of Alcator C-mod plasmas journal May 2003
Scaling of the tokamak near the scrape-off layer H-mode power width and implications for ITER journal August 2013
Edge x-ray imaging measurements of plasma edge in Alcator C-Mod journal January 1999
H-mode pedestal and threshold studies over an expanded operating space on Alcator C-Mod journal May 2007
Progress in tokamak research at MIT journal September 1985
Lower hybrid current drive experiments on Alcator C-Mod: Comparison with theory and simulation journal May 2008
The dynamics and structure of edge-localized-modes in Alcator C-Mod journal June 2007
Particle transport in tokamak plasmas, theory and experiment journal November 2009
Disruption mitigation on Alcator C-Mod using high-pressure gas injection: Experiments and modeling toward ITER journal June 2007
Mirror Langmuir probe: A technique for real-time measurement of magnetized plasma conditions using a single Langmuir electrode journal July 2007
Internal transport barriers in tokamak plasmas* journal November 2002
Studies of turbulence and transport in Alcator C-Mod ohmic plasmas with phase contrast imaging and comparisons with gyrokinetic simulations journal April 2009
Operation of Alcator C-Mod with high-Z plasma facing components and implications journal May 2006
Impurity toroidal rotation and transport in Alcator C-Mod ohmic high confinement mode plasmas journal May 2000
RF plasma edge interactions and their impact on ICRF antenna performance in Alcator C-Mod journal June 2007
Iterated finite-orbit Monte Carlo simulations with full-wave fields for modeling tokamak ion cyclotron resonance frequency wave heating experiments journal May 2010
H mode confinement in Alcator C-Mod journal June 1997
Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies journal January 2012
Full wave simulation of lower hybrid waves in Maxwellian plasma based on the finite element method journal September 2009
Implementation and application of two synthetic diagnostics for validating simulations of core tokamak turbulence journal May 2009
Upgrade of reflectometry profile and fluctuation measurements in Alcator C-Mod journal January 1999
Using mixed gases for massive gas injection disruption mitigation on Alcator C-Mod journal April 2011
11th IAEA Technical Meeting on H-mode Physics and Transport Barriers journal July 2008
Atomic processes in thermonuclear fusion plasmas book October 1993
Review of recent experimental and modeling progress in the lower hybrid range of frequencies at ITER relevant parameters conference January 2014
Design of a New Optical System for Alcator C-Mod Motional Stark Effect Diagnostic report November 2009
Validation in Fusion Research: Towards Guidelines and Best Practices text January 2008
Stability and toroidal rotation properties of highly shaped plasmas in the TCV tokamak text January 2006

Cited By (17)

Universality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layer journal December 2018
VITALS: A Surrogate-Based Optimization Framework for the Accelerated Validation of Plasma Transport Codes journal February 2018
Investigation of the critical edge ion heat flux for L-H transitions in Alcator C-Mod and its dependence on B T journal March 2018
Edge transport and mode structure of a QCM-like fluctuation driven by the Shoelace antenna journal March 2018
Validation study of GENE on ASDEX Upgrade using perturbative thermal diffusivity measured with partial sawtooth heat pulses journal September 2018
Progress towards modeling tokamak boundary plasma turbulence and understanding its role in setting divertor heat flux widths journal May 2018
Intermittent fluctuations in the Alcator C-Mod scrape-off layer for ohmic and high confinement mode plasmas journal May 2018
Outlier classification using autoencoders: Application for fluctuation driven flows in fusion plasmas journal January 2019
Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod journal September 2018
Summary of the 8th Asia-Pacific Transport Working Group (APTWG) Meeting journal January 2019
Hysteresis as a probe of turbulent bifurcation in intrinsic rotation reversals on Alcator C-Mod journal August 2019
Verification of GENE and GYRO with L-mode and I-mode plasmas in Alcator C-Mod journal April 2018
Radiative heat exhaust in Alcator C-Mod I-mode plasmas journal March 2019
The dependence of divertor power sharing on magnetic flux balance in near double-null configurations on Alcator C-Mod journal May 2018
Particle balance in a steady state plasma in a dipole magnetic field journal November 2019
Observation of Efficient Lower Hybrid Current Drive at High Density in Diverted Plasmas on the Alcator C-Mod Tokamak journal August 2018
Universality of Poisson-driven plasma fluctuations in the Alcator C-Mod scrape-off layer preprint January 2018

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