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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:22403240

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. A summary of important achievements and discoveries are included.

OSTI ID:
22403240
Journal Information:
Physics of Plasmas, Vol. 21, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
Country of Publication:
United States
Language:
English

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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
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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
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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