2D soft x-ray system on DIII-D for imaging the magnetic topology in the pedestal region

Shafer, M. W.; Battaglia, D. J.; Unterberg, E. A.; Evans, T. E.; Hillis, D. L.; Maingi, R.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10E534
Academic Journal
A new tangential two-dimensional soft x-ray imaging system (SXRIS) is being designed to examine the edge island structure in the lower X-point region of DIII-D. Plasma shielding and/or amplification of the calculated vacuum islands may play a role in the suppression of edge-localized modes via resonant magnetic perturbations (RMPs). The SXRIS is intended to improve the understanding of three-dimensional (3D) phenomena associated with RMPs. This system utilizes a tangential view with a pinhole imaging system and spectral filtering with beryllium foils. SXR emission is chosen to avoid line radiation and allows suitable signal at the top of a H-mode pedestal where Te∼1-2 keV. A synthetic diagnostic calculation based on 3D SXR emissivity estimates is used to help assess signal levels and resolution of the design. A signal-to-noise ratio of 10 at 1 cm resolution is expected for the perturbed signals, which are sufficient to resolve most of the predicted vacuum island sizes.


Related Articles

  • Beryllium foil transition-radiation source for x-ray lithography. Piestrup, M.A.; Boyers, D.G.; Pincus, C.I.; Harris, J.L.; Caplan, H.S.; Silzer, R.M.; Skopik, D.M. // Applied Physics Letters;7/8/1991, Vol. 59 Issue 2, p189 

    Examines the use of beryllium foil transition-radiation source for x-ray lithography. Penetration of beryllium foil by a relativistic electron beam; Measurement of the maximum total soft x-ray power; Comparison between the calculated spectral photon density of the aluminum and beryllium radiators.

  • IMPROVED HYBRID MODEL FOR DENOISING POISSON CORRUPTED XRAY IMAGES. Umadevi, N.; Geethalakshmi, S.N. // International Journal on Computer Science & Engineering;2011, Vol. 3 Issue 7, p2610 

    Medical practitioners are increasingly using digital images during disease diagnosis. Several state-of-the-art medical equipments are producing images of different organs, which are used during various stages of analysis. Examples of such devices include MRI, CT, ultrasound and X-Ray. Out of...

  • Impact of the X-ray system setting on patient dose and image quality; a case study with two interventional cardiology systems. Vassileva, J.; Vano, E.; Ubeda, C.; Rehani, M.; Zotova, R. // Radiation Protection Dosimetry;Jul2013, Vol. 155 Issue 3, p329 

    This study investigates the influence of the initial X-ray system setting on patient doses and image quality in interventional cardiology procedures. Two dedicated interventional cardiology systems were studied: a system with image intensifier (II) and a flat detector (FD) system. Entrance...

  • Hard-X-ray dark-field imaging using a grating interferometer. Pfeiffer, F.; Bech, M.; Bunk, O.; Kraft, P.; Eikenberry, E. F.; Brönnimann, Ch.; Grünzweig, C.; David, C. // Nature Materials;Feb2008, Vol. 7 Issue 2, p134 

    Imaging with visible light today uses numerous contrast mechanisms, including bright- and dark-field contrast, phase-contrast schemes and confocal and fluorescence-based methods. X-ray imaging, on the other hand, has only recently seen the development of an analogous variety of contrast...

  • Present Status of the Nanotomography System at BL47XU at SPring-8 and Its Efficiency Improvement Using Double-Condenser Optics. Takeuchi, A.; Suzuki, Y.; Uesugi, K. // AIP Conference Proceedings;9/9/2011, Vol. 1365 Issue 1, p301 

    Although imaging x-ray nanotomography developed at beamline BL47XU of SPring-8 has reached a spatial resolution less than 200 nm, poor intensity and low signal-to-noise ratio are more serious problems in the system using zone plate optics. Improvement of the diffraction efficiency of Köhler...

  • Hard X-ray Fourier Transform Holography Using a Reference Scatterer Fabricated by Electron-Beam-Assisted Chemical-Vapor Deposition. Suzuki, M.; Kondo, Y.; Isogami, S.; Tsunoda, M.; Takahashi, S.; Ishio, S. // AIP Conference Proceedings;9/9/2011, Vol. 1365 Issue 1, p293 

    We present a fabrication method for a reference source that is efficient when used for lensless Fourier transform holography. This method produces a reference source that yields high spatial resolution and enhanced signal-to-noise ratio in a Fourier-transformed real-space image, and is...

  • A Condenser Scanner for Artifact-Free, Large Field of View, Full-Field X-ray Microscopy at Synchrotrons. Rudati, J.; Irwin, J.; Tkachuk, A.; Andrews, J. C.; Pianetta, P.; Feser, M. // AIP Conference Proceedings;9/9/2011, Vol. 1365 Issue 1, p136 

    Most full-field microscopes at synchrotrons exhibit a highly peaked illumination in the center of the field of view for stationary condenser and objective optics. This illumination pattern is typically reference-corrected by division with an image without the sample to correct for the uneven...

  • Artifact Reduction in Industrial Computed Tomography via Data Fusion. Schrapp, Michael; Goldammer, Matthias; Stephan, Jürgen // AIP Conference Proceedings;2014, Vol. 1581, p1961 

    As the most stressed part of a gas turbine the first row of turbine blades is not only a challenge for the materials used. Also the testing of these parts have to meet the highest standards. Computed tomography (CT) as the technique which could reveal the most details also provides the biggest...

  • Dynamic granularity of imaging systems. Geissel, Matthias; Smith, Ian C.; Shores, Jonathon E.; Porter, John L. // Review of Scientific Instruments;Nov2015, Vol. 86 Issue 11, p1 

    Imaging systems that include a specific source, imaging concept, geometry, and detector have unique properties such as signal-to-noise ratio, dynamic range, spatial resolution, distortions, and contrast. Some of these properties are inherently connected, particularly dynamic range and spatial...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics