Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod (doi:10.7910/DVN/0JOUCX)

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Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod

doi:10.7910/DVN/0JOUCX

Harvard Dataverse

2018-10-03

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J.W. Hughes, P.B. Snyder, M.L. Reinke, B. LaBombard, S. Mordijck, S. Scott, E. Tolman, S.G. Baek, T. Golfinopoulos, R.S. Granetz, M. Greenwald, A.E. Hubbard, E. Marmar, J.E. Rice, A.E. White, D.G. Whyte, T. Wilks, S. Wolfe, 2018, "Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod", https://doi.org/10.7910/DVN/0JOUCX, Harvard Dataverse, V1

Access to pedestal pressure relevant to burning plasmas on the high magnetic field tokamak Alcator C-Mod

doi:10.7910/DVN/0JOUCX

J.W. Hughes, P.B. Snyder, M.L. Reinke, B. LaBombard, S. Mordijck, S. Scott, E. Tolman, S.G. Baek, T. Golfinopoulos, R.S. Granetz, M. Greenwald, A.E. Hubbard, E. Marmar, J.E. Rice, A.E. White, D.G. Whyte, T. Wilks, S. Wolfe

Harvard Dataverse

https://doi.org/10.7910/DVN/0JOUCX

Physics, Alcator C-Mod, confinement, h-mode, high field, pedestal

Experiments on the Alcator C-Mod tokamak have utilized reactor-relevant magnetic fields to sustain substantially higher pedestal pressure than in other devices and allow close approach to the ITER H-mode baseline target pedestal pressure of 90 kPa. The EPED model, which couples the physics of transport driven by kinetic ballooning modes and MHD instabilities arising from peeling-ballooning modes, predicts the pressure profile at the onset of edge-localized modes (ELMs), and yields to lowest order a critical-βN like behavior for the pedestal: p∝Bt×Bp ( ∝Bt^2 for fixed edge q). C-Mod routinely accesses edge plasma pressure in excess of 30 kPa, often by using a high-density (ne>3×10^20 m^-3) approach to high confinement, taking advantage of a regime known as enhanced D-alpha (EDA) H-mode. In the EDA H-mode, plasma transport regulates both the pedestal profiles and the core impurity content, thus holding the pedestal stationary at just below the peeling-ballooning stability boundary. This stationary ELM-suppressed regime has approached the maximum pedestal predicted by EPED at these densities: 60 kPa. This in turn gives rise to volume-averaged core plasma pressure in excess of 0.2MPa, a world record value for a magnetic fusion device. Another approach to achieving high pressure utilizes a pedestal limited by current-driven modes at low collisionality, in which pressure increases with density and which allows access to a higher EPED solution, termed “super-H”. C-Mod experiments at reduced density (ne<2×10^20 m^-3) and strong plasma shaping (δ>0.5) accessed this regime, producing pedestals with pressures up to 80kPa (approximately 90% of the ITER target) and temperatures of nearly 2 keV. In a number of these hot H-modes, we observe strong edge instabilities at low toroidal mode number (n=1) when pedestal pressure approaches predicted values from EPED, showing that current-driven MHD modes can serve as a limit on the pedestal in a metal-walled tokamak at high pressure and low collisionality.

<a href="http://library.psfc.mit.edu/catalog/reports/2010/18ja/18ja005/abstract.php">PSFC REPORT PSFC/JA-18-5</a><br /><br />Supported by U.S. Department of Energy awards DE-FC02-99ER54512, DE-FG02-95ER54309, DE-FC02-06ER54873, DE-AC02-09CH11466, DE-AC05-00OR22725, DE-SC0007880 using Alcator C-Mod, a DOE Office of Science User Facility.

This dataset is made available without information on how it can be used. You should communicate with the Contact(s) specified before use.

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