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 Wolfe Harvard Dataverse 2018 Physics Alcator C-Mod confinement h-mode high field pedestal 2018-10-03 10.7910/DVN/0JOUCX/TQNIZK 10.7910/DVN/0JOUCX/5SENDC 10.7910/DVN/0JOUCX/7NV8ER 10.7910/DVN/0JOUCX/1HSVOZ 10.7910/DVN/0JOUCX/JBACGN 10.7910/DVN/0JOUCX/2BEVGG 10.7910/DVN/0JOUCX/FQUF24 10.7910/DVN/0JOUCX/EPPDUT 10.7910/DVN/0JOUCX/V9VOIW 10.7910/DVN/0JOUCX/BO4FUW 10.7910/DVN/0JOUCX/Q88SES 10.7910/DVN/0JOUCX/EGDW3P 10.7910/DVN/0JOUCX/9WHUJR 10.7910/DVN/0JOUCX/OICU5O 10.7910/DVN/0JOUCX/IE08GY 10.7910/DVN/0JOUCX/YSKQXK 10.7910/DVN/0JOUCX/KONOEU 10.7910/DVN/0JOUCX/MBMPE1 10.7910/DVN/0JOUCX/LR1RIQ 10.7910/DVN/0JOUCX/T9GL8U 10.7910/DVN/0JOUCX/PDSXAL 10.7910/DVN/0JOUCX/TW2LYA 10.7910/DVN/0JOUCX/MTU8PG 10.7910/DVN/0JOUCX/O7V3FI 10.7910/DVN/0JOUCX/B1WCZ8 10.7910/DVN/0JOUCX/QJPPZY 10.7910/DVN/0JOUCX/517PK2 10.7910/DVN/0JOUCX/GKVHCH 10.7910/DVN/0JOUCX/GQVTZL 10.7910/DVN/0JOUCX/WGLLZZ 10.7910/DVN/0JOUCX/PBJYWO 1138190 2466734 16048 20337312 1135878 2864182 20160 13808 42656 279040 62072 6156296 223376 2377770 2560550 101000 11392 1533770 1424522 372488 18279787 1695330 9312 5732062 34608 2864182 1788290 1404062 24952 1423370 3318066 application/postscript application/postscript application/x-hdf5 application/x-hdf5 application/postscript application/postscript application/x-hdf5 application/x-hdf5 application/x-hdf5 application/x-hdf5 application/x-hdf5 application/x-hdf5 application/x-hdf5 application/postscript application/postscript application/x-hdf5 application/x-hdf5 application/postscript application/postscript application/x-hdf5 application/pdf application/postscript application/x-hdf5 application/postscript application/x-hdf5 application/postscript application/postscript application/postscript application/x-hdf5 application/postscript application/postscript 1.0 Custom terms specific to this dataset 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&gt;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&lt;2×10^20 m^-3) and strong plasma shaping (δ&gt;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.