POP: Magnetically Confined Plasmas, Heating, Confinement http://scitation.aip.org/ POP: Magnetically Confined Plasmas, Heating, Confinement Defect modes in one-dimensional magnetized plasma photonic crystals with a dielectric defect layer http://link.aip.org/link/?PHP/19/012509/1&agg=rss L. Qi, Z. Yang, and T. Fu<br/> By using transfer matrix method, properties of one-dimensional magnetized plasma photonic crystals with a dielectric defect layer are studied. Results show that several defect modes appear within the photonic band gaps; periodic number and collision frequency only affect transmission magnitude of th ... [Phys. Plasmas 19, 012509 (2012)] published Fri Jan 27, 2012. Energetics of runaway electrons during tokamak disruptions http://link.aip.org/link/?PHP/19/012507/1&agg=rss J. Riemann, H. M. Smith, and P. Helander<br/> In a tokamak disruption, a substantial fraction of the plasma current can be converted into runaway electrons. Although these are usually highly relativistic, their total energy is initially much smaller than that of the pre-disruption plasma. However, following a suggestion by Putvinski et al. [Pla ... [Phys. Plasmas 19, 012507 (2012)] published Thu Jan 26, 2012. Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies http://link.aip.org/link/?PHP/19/012508/1&agg=rss H. Kohno, J. R. Myra, and D. A. D'Ippolito<br/> A new finite element numerical scheme for analyzing self-consistent radio-frequency (RF) sheath-plasma interaction problems in the ion cyclotron range of frequencies is applied to various problems represented by simplified models for the tokamak scrape-off layer. The present code incorporates a modi ... [Phys. Plasmas 19, 012508 (2012)] published Thu Jan 26, 2012. Evidence cross-validation and Bayesian inference of MAST plasma equilibria http://link.aip.org/link/?PHP/19/012506/1&agg=rss G. T. von Nessi, M. J. Hole, J. Svensson, and L. Appel<br/> In this paper, current profiles for plasma discharges on the mega-ampere spherical tokamak are directly calculated from pickup coil, flux loop, and motional-Stark effect observations via methods based in the statistical theory of Bayesian analysis. By representing toroidal plasma current as a series ... [Phys. Plasmas 19, 012506 (2012)] published Mon Jan 23, 2012. Tokamak L/H mode transition http://link.aip.org/link/?PHP/19/012505/1&agg=rss K. H. Tsui and C. E. Navia<br/> Through the non field-aligned rotational tokamak equilibrium of a divergence-free plasma flow with a pair of transformed plasma variables w-vector=([mu]rho) nu-vector and [mu]p=([mu]p+w/2) [K. H. Tsui, Phys. Plasmas 18, 072502 (2011)], a preliminary understanding of the L/H equilibrium transition is ... [Phys. Plasmas 19, 012505 (2012)] published Thu Jan 19, 2012. Optical and magneto-optical properties of one-dimensional magnetized coupled resonator plasma photonic crystals http://link.aip.org/link/?PHP/19/012503/1&agg=rss S. M. Hamidi<br/> In this paper, the optical and magneto-optical properties of one-dimensional magnetized coupled resonator plasma photonic crystals have been investigated. We use transfer matrix method to solve our magnetized coupled resonator plasma photonic crystals consist of dielectric and magnetized plasma laye ... [Phys. Plasmas 19, 012503 (2012)] published Tue Jan 17, 2012. Topology of tokamak plasma equilibria with toroidal current reversal http://link.aip.org/link/?PHP/19/012504/1&agg=rss Paulo Rodrigues and Joao P. S. Bizarro<br/> Some general principles about scalar functions with critical points are used to rigorously ascertain that magnetic equilibria with both toroidal current reversal and nested magnetic surfaces are atypical solutions and highly unstable to arbitrary perturbations of boundary conditions and other parame ... [Phys. Plasmas 19, 012504 (2012)] published Tue Jan 17, 2012. Active control of the resistive wall mode with power saturation http://link.aip.org/link/?PHP/19/012502/1&agg=rss Li Li, Yue Liu, and Yueqiang Liu<br/> An analytic model of non-linear feedback stabilization of the resistive wall mode is presented. The non-linearity comes from either the current or the voltage saturation of the control coil power supply. For the so-called flux-to-current control, the current saturation of active coils always results ... [Phys. Plasmas 19, 012502 (2012)] published Mon Jan 9, 2012. Hybrid time dependent/independent solution for the He I line ratio temperature and density diagnostic for a thermal helium beam with applications in the scrape-off layer-edge regions in tokamaks http://link.aip.org/link/?PHP/19/012501/1&agg=rss J. M. Munoz Burgos, O. Schmitz, S. D. Loch, and C. P. Ballance<br/> Spectroscopic studies of line emission intensities and ratios offer an attractive option in the development of non-invasive plasma diagnostics. Evaluating ratios of selected He I line emission profiles from the singlet and triplet neutral helium spin systems allows for simultaneous measurement of el ... [Phys. Plasmas 19, 012501 (2012)] published Fri Jan 6, 2012. Linear and nonlinear verification of gyrokinetic microstability codes http://link.aip.org/link/?PHP/18/122505/1&agg=rss R. V. Bravenec, J. Candy, M. Barnes, and C. Holland<br/> Verification of nonlinear microstability codes is a necessary step before comparisons or predictions of turbulent transport in toroidal devices can be justified. By verification we mean demonstrating that a code correctly solves the mathematical model upon which it is based. Some degree of verificat ... [Phys. Plasmas 18, 122505 (2011)] published Fri Dec 30, 2011. Gyrokinetic determination of the electrostatic potential of rotating magnetic islands in tokamaks http://link.aip.org/link/?PHP/18/122506/1&agg=rss M. Siccinio, E. Poli, F. J. Casson, W. A. Hornsby, and A. G. Peeters<br/> The electrostatic potential related to a magnetic island structure with imposed width and rotation frequency is studied by means of gyrokinetic simulations, which allow its self-consistent determination via the Poisson equation. An adiabatic response of the trapped ions at the island separatrix lead ... [Phys. Plasmas 18, 122506 (2011)] published Fri Dec 30, 2011. X-transport of ions in diverted tokamaks, with application to DIII-D http://link.aip.org/link/?PHP/18/122504/1&agg=rss Weston M. Stacey<br/> A calculation model for X-transport due to the radially outward grad-B and curvature drift of ions trapped poloidally in the null-B X-region just inside the X-point in diverted tokamaks is presented. Calculations are presented for two representative DIII-D [J. Luxon, Nucl. Fusion 42, 614 (2002)] sho ... [Phys. Plasmas 18, 122504 (2011)] published Thu Dec 29, 2011. Analytic model for coaxial helicity injection in tokamak plasmas http://link.aip.org/link/?PHP/18/122503/1&agg=rss R. H. Weening<br/> Using a partial differential equation for the time evolution of the mean-field poloidal magnetic flux that incorporates resistivity eta and hyper-resistivity Lambda terms, an exact analytic solution is obtained for steady-state coaxial helicity injection (CHI) in force-free large aspect ratio tokama ... [Phys. Plasmas 18, 122503 (2011)] published Tue Dec 13, 2011. Mean-field Ohm's law and coaxial helicity injection in force-free plasmas http://link.aip.org/link/?PHP/18/122502/1&agg=rss R. H. Weening<br/> A theoretical analysis of steady-state coaxial helicity injection (CHI) in force-free plasmas is presented using a parallel mean-field Ohm's law that includes resistivity eta and hyper-resistivity Lambda terms. Using Boozer coordinates, a partial differential equation is derived for the time evoluti ... [Phys. Plasmas 18, 122502 (2011)] published Tue Dec 13, 2011. Isotope mass and charge effects in tokamak plasmas http://link.aip.org/link/?PHP/18/122501/1&agg=rss I. Pusztai, J. Candy, and P. Gohil<br/> The effect of primary ion species of differing charge and massspecifically, deuterium, hydrogen, and heliumon instabilities and transport is studied in DIII-D plasmas through gyrokinetic simulations with gyro [J. Candy and E. Belli, General Atomics Technical Report No. GA-A26818, 2010]. In linear si ... [Phys. Plasmas 18, 122501 (2011)] published Tue Dec 13, 2011. Three-dimensional magnetohydrodynamics simulations of counter-helicity spheromak merging in the Swarthmore Spheromak Experiment http://link.aip.org/link/?PHP/18/112512/1&agg=rss C. E. Myers, E. V. Belova, M. R. Brown, T. Gray, C. D. Cothran et al.<br/> Recent counter-helicity spheromak merging experiments in the Swarthmore Spheromak Experiment (SSX) have produced a novel compact torus (CT) with unusual features. These include a persistent antisymmetric toroidal magnetic field profile and a slow, nonlinear emergence of the n = 1 tilt mode. Experime ... [Phys. Plasmas 18, 112512 (2011)] published Wed Nov 30, 2011. Radial transport of energetic ions in the presence of trapped electron mode turbulence http://link.aip.org/link/?PHP/18/112510/1&agg=rss J. Chowdhury, W. Wang, S. Ethier, J. Manickam, and R. Ganesh<br/> The nature of transport of hot ions is studied in the presence of microturbulence generated by the trapped electron mode in a Tokamak using massively parallel, first principle based global nonlinear gyrokinetic simulation, and with the help of a passive tracer method. Passing and trapped hot ions ar ... [Phys. Plasmas 18, 112510 (2011)] published Tue Nov 29, 2011. Measurements accounting for the impediment of ion spin-up in rotating magnetic field driven field reversed configurations http://link.aip.org/link/?PHP/18/112511/1&agg=rss C. L. Deards, A. L. Hoffman, and L. C. Steinhauer<br/> Improved vacuum hygiene, wall conditioning, and reduced recycling in the rotating magnetic field (RMF) driven translation, confinement, and sustainmentupgrade (TCSU) field reversed configuration experiment have made possible a more accurate assessment of the forces affecting ion spin-up. This issue ... [Phys. Plasmas 18, 112511 (2011)] published Tue Nov 29, 2011. Effect of pedestal height and internal transport barriers on International Thermonuclear Experimental Reactor target steady state simulations http://link.aip.org/link/?PHP/18/112508/1&agg=rss T. Rafiq, A. H. Kritz, G. Bateman, C. Kessel, D. C. McCune et al.<br/> The Tokamak simulation code (TSC) is used to provide initial conditions for predictive TRANSPort and integrated modeling code (PTRANSP) simulations of ITER target steady state scenarios. The PTRANSP simulations are carried out using the new multi-mode (MMM7.1) and the gyro-Landau-fluid (GLF23) trans ... [Phys. Plasmas 18, 112508 (2011)] published Mon Nov 28, 2011. Hybrid equilibria of field-reversed configurations http://link.aip.org/link/?PHP/18/112509/1&agg=rss Loren C. Steinhauer<br/> This paper presents the first detailed model of hybrid equilibria relevant to field-reversed configuration experiments, leading to a system of equations that are solved for a range of fully two-dimensional equilibria. Several features of these highly kinetic objects are explored. The range of equili ... [Phys. Plasmas 18, 112509 (2011)] published Mon Nov 28, 2011. The role of surface currents in plasma confinement http://link.aip.org/link/?PHP/18/112507/1&agg=rss Anthony J. Webster<br/> During plasma instabilities, surface currents can flow at the interface between the plasma and the surrounding vacuum, and in most cases, they are a harmless symptom of the instability that is causing them. Large instabilities can lead to disruptions, an abrupt termination of the plasma with the pot ... [Phys. Plasmas 18, 112507 (2011)] published Tue Nov 22, 2011.