56th Annual Meeting of the Division of Plasma Physics, October 27 – October 31, 2014, New Orleans, LA Increase ion temperature with neutral beams: Study.

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56th Annual Meeting of the Division of Plasma Physics, October 27 – October 31, 2014, New Orleans, LA Increase ion temperature with neutral beams: Study role of high-effective transform (i eff ~ 3) on ion confinement with tangential injection into high-electron temperature plasma Explore transport with E r in reactor-relevant ion root Study low-collisionality ion transport Higher density operation with neutral source control: Higher density core plasma and interface to scrape-off layer Study impurity transport and exhaust in ion root E r Reduce neutral source in core to facilitate density and exhaust control Explore feasibility of optimizing for reducing turbulent transport Builds on quasisymmetric magnetic topology which is optimized for improved neoclassical transport Upgrades needed for physics program: New vacuum vessel and type #1 coils for NBI and diagnostic access, improved conditioning, larger plasma/wall separation, more room for flexible divertor configurations ECH: 500 kW, 0.3 s, 56 GHz; energetic electron transport and beam target NBI: 2 X 300 kW 40 keV 0.3s systems (Budker Inst./ Compass D units) Infrastructure upgrades to accommodate new capabilities Bader UP , Talmadge (UP ) HSX Upgrade Overview of the HSX Program and Plans for Upgrade D.T. Anderson & the HSX Team HSX Plasma Laboratory, Univ. of Wisconsin, Madison, USA; Overview Present experimental program concentrated on 4 main areas: 1) equilibrium reconstruction, 2) core transport, 3) plasma flows and electric fields and 4) edge transport. Experimental and theoretical results illuminate physics issues that impact Wendelstein 7-X, which comes on-line in  Equilibrium reconstruction demonstrates time evolution of bootstrap current, critical to proper functioning of W7-X divertor.  Heat pulse propagation experiment demonstrates lack of stiffness in heat transport, in agreement with 3-D gyrokinetic calculations using two kinetic species  Improvement in neoclassical theory are being benchmarked and demonstrated experimentally.  Work has begun on using motional stark effect to measure radial electric field and bootstrap current profile in HSX.  Edge studies show electric field in edge island which could impact W7-X divertor and is not included in EMC3-EIRENE modeling. Proposal submitted by Prof. O. Schmitz as PI investigates 3-D equilibrium reconstruction and impact on edge transport and island divertor performance in W7-X involving HSX, CTH (Auburn) and small plasma device. HSX upgrade planned to focus on hotter ion temperatures, ion root transport, turbulent transport mitigation and divertor optimization. Equilibrium Reconstruction Core Transport Plasma Flow & Electric Fields Edge Transport Equilibrium Reconstruction Theory and Modeling Optimized coil placement Spark V3FIT Experiment Reduced profile uncertainty Eddy current modeling Bootstrap current evolution & rational surfaces eChlechowitz UP Core Transport Theory and Modeling GENE calculations confirm experimental lack of stiffness in core. Faber CP (Monday) Optimization of auxiliary coil currents to reduce TEM transport Talmadge UP Experiment Pulse propagation experiments indicate transport is not stiff in core. Weir TI (Monday) Interferometer measurements of density fluctuations show increase with decreasing L n (off-axis heating), consistent with TEM drive Deng UP Plasma Flow & Electric Fields Theory and Modeling Compare DKES and PENTA codes, both assume mono- energetic distribution, to SFINCS (Landreman) and FORTEC-3D (Satake) which do not Smoniewski UP Experiment Inboard/outboard CXRS measurement of Pfirsch-Schluter flow indicates larger core Er than measured previously Kumar UP Examine Motional Stark Effect to measure Er and B using spectral fitting Ruiz UP and polarimetry Dobbins UP Reynolds stress measurements at plasma edge suggest that in a quasisymmetric stellarator, it influences Er Wilcox YP (Friday) Edge Transport Theory and Modeling Simulate edge Te, ne and plasma flow at edge with EMC3-EIRENE given different boundary conditions Bader UP Compare DEGAS neutral calculations to EIRENE Stephey Experiment Electric fields measured within islands that is not modeled with EMC3-EIRENE Akerson UP Study neutral fueling in preparation for pumped limiter studies Stephey UP Proposed Collaboration with W7X Joint proposal with Auburn University aims at investigating 3-D equilibrium effects on edge transport and divertor performance at Wendelstein 7-X. P.I.: O. Schmitz, UW-Madison Domestic activities include HSX, CTH, helicon linear device, EMC3- EIRENE and V3FIT. Briesemeister 2013: CXRS measurements of E r do not agree with model at center and edge. Is the model or the expt in error? Schmitt, PoP Sept. 2014: momentum conservation and E r impacts bootstrap current in HSX Activities on HSX center on validation and testing of EMC3- EIRENE, implement and test line ratio spectroscopy on helium as a divertor diagnostic, and explore helium exhaust. Proposal takes advantage of HSX strength in examining core- edge coupling.