Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session A6: New Directions in Plasma Science and Fusion |
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Sponsoring Units: DPP/GPAP NSBP/NSHP Chair: Steven Allen, Lawrence Livermore National Laboratory Room: Washington 5 |
Saturday, February 13, 2010 8:30AM - 9:06AM |
A6.00001: Application of Spectro-Polarimetric Techniques for Imaging Plasma Flows and Current Density in Fusion Devices Invited Speaker: Recent advances in optical coherence imaging have opened up new avenues for active and passive plasma diagnostic systems in fusion devices. Based on polarization interferometric architectures, these systems exploit the detector area to both target and image the projection of physical parameters such as the ion temperature, the flow speed, and the magnetic field pitch encoded in the spectral scene. These imaging devices are referred to as spectro-polarimeters. Following their description, we report recent imaging results of the magnetic field pitch angle associated with the motional Stark effect on injected neutral hydrogen obtained on the TEXTOR tokamak. With this active imaging capability, two-dimensional measurements of the current density can be deduced. In addition, we show two types of interferometric flow measurements at the edge of the DIIID tokamak using the passive plasma emission of CIII and the neutral beam induced CVI emission. We observe that the projected flow along the sight line is affected by the reversal of the toroidal current. Finally, an overview of future experimental campaigns to access physics pertaining to the edge flows in tokamaks will be discussed. [Preview Abstract] |
Saturday, February 13, 2010 9:06AM - 9:42AM |
A6.00002: Multi-energy SXR imaging for magnetically confined fusion studies Invited Speaker: Multi-energy soft X-ray imaging is being developed for fast ($<1$ ms) time and space-resolved measurements of the SXR emissivity profiles in multiple broadband energy ranges. The capabilities of this diagnostic technique for radio frequency heating experiments, fast electron temperature measurements, perturbative momentum, electron and impurity transport studies will be discussed, and examples of the impact on the ME-SXR profiles from several types of MHD activity such as NTMs, RWMs, ELMs and Fishbones will be presented. These results indicate that the ME-SXR technique has very good potential for non-magnetic control of fusion plasmas. This work was supported by U.S. DoE Contract No. DE-AC02-76CH03073 and DoE grant No. DE-FG02-99ER5452 at The Johns Hopkins University. [Preview Abstract] |
Saturday, February 13, 2010 9:42AM - 10:18AM |
A6.00003: Investigations of Dusty Plasmas in the Near Earth Space Environment Invited Speaker: Dusty plasmas in the near earth space environment have been argued to have important implications for global change and therefore continue to be a forefront research agenda in the space science community. The natural dust layer results in beautiful visual displays in the form of noctilucent (and polar mesospheric) clouds. Also, radar echoes associated with these clouds, phenomenologically termed Polar Mesospheric Summer Echoes PMSE, have been studied for the past 30 years due to their continued promise for providing remote sensing information on the natural dust layer. Recently, active space experiments have attempted to provide further information on the creation and evolution of the natural dust layer by investigation of an artificial dust layer utilizing sounding rocket experimental techniques. To this end, current research agendas involving dust layers in the near earth space environment will be discussed in this presentation. Emphasis will be placed on 1) utilization of high power radio wave modification experiments of the natural dust layer as a potential diagnostic technique and 2) computational modeling of turbulence in artificially generated dust layers in the space environment. Much of the discussion will summarize the effort at Virginia Tech over the past few years. [Preview Abstract] |
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