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These pages provide an access point to data contained in CCFE published journal papers.  By selecting a paper, and then a specific figure or table, you can request the related underlying data if it is available for release.

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Publication Figures

Publication Date:
2020-10-21

First Author:
A. R. Jackson

Title:
Diagnosing fast ion redistribution due to sawtooth instabilities using fast ion deuterium-alpha spectroscopy in the Mega Amp Spherical Tokamak

Paper Identifier:
CP/20/224

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Figure Reference Title Description Number of Figure Data Items Identifier Download Figure Details
Figure 1 Example FIDASIM spectrum Example spectra generated with FIDASIM of the toroidal view on MAST showing the FIDA, BES and halo components of the spectra. The dotted vertical line shows the location of the rest wavelength of deuterium-alpha emission, 656.1 nm. The BES (beam emission spectroscopy) peaks are caused by collisional excitation of beam neutrals to n=3 states. There are three such peaks since the beam contains neutrals with energies equal to one half and one third of the primary energy. 2 CF/20/225 Download
Figure 2a Spatial distribution of fast ions before a sawtooth crash The simulated fast-ion density in an azimuthal cross section of MAST before a sawtooth crash, with the flux surfaces shown in black. 1 CF/20/228 Download
Figure 2b Spatial distribution of fast ions after a sawtooth crash The simulated fast-ion density in an azimuthal cross section of MAST after a sawtooth crash, with the flux surfaces shown in black. 1 CF/20/229 Download
Figure 3a, 3b, 3c, 3d Time traces of various plasma parameters Time traces of plasma parameters for the three shots used in averaging (29880, 29881, 29882). (a) NBI power, (b) neutron rate, (c) core electron temperature, (d) core electron density. 0 CF/20/230 Download
Figure 4 Soft X-ray time traces for shots 29880, 29881, 29882 Soft X-ray (SXR) trace showing a sawtooth crash for shots #29880, #29881 and #29882. 0 CF/20/231 Download
Figure 5 Full redshifted spectrum showing the experimental results, the summation of the synthetic spectral components and the FIDA synthetic component alone Full experimental FIDA spectrum for shot #29880 along with the corresponding synthetic spectrum, showing the summation of all the synthetic components and the synthetic FIDA component in isolation (using the Kadomtsev model only, as an example). The shaded area shows the extent of the experimental spectrum that is usable for analysis. All other wavelength regions are unusable for fast ion studies due to an optical mask blocking bright unwanted regions of the spectra, unwanted spectral components dominating the FIDA component, or the lack of any fast ion signal at all. 2 CF/20/232 Download
Figure 6 FIDA and FIDASIM spectra, before and after a sawtooth crash Spectra observed before and after a crash, with the experimental results and the synthetic spectra for the 3 different sawtooth models. 2 CF/20/233 Download
Figure 7a-7f Relative change in spectra over a number of FIDA channels Spectral radiance across a number of FIDA channels. Note that the full energy BES peak appears at different locations depending on channel. The grey shaded area in plots (a)-(e) designates where the effect of the peak has a significant effect on the synthetic data, so direct comparisons between the observations and the models cannot be made here. 2 CF/20/234 Download
Figure 8 Simulated fast-ion velocity distributions before and after a sawtooth crash. Simulated fast ion distributions for R = 1.205 m in the device midplane using the Kadomtsev model. (a) Before crash, (b) after crash. The green contours represent the weight function for the FIDA diagnostic in the fast-ion dominated wavelength range and the spatial location of measurement. 2 CF/20/235 Download
Figure 9 Relative change after a sawtooth crash in fast-ion velocity distribution over 3 different sawtooth models. The relative change in the fast-ion distribution function for R = 1.205 m in the device midplane. (a) Kadomtsev, (b) Ergodic Kadomtsev, (c) Porcelli. Areas in green represent phase-space regions with a fast-ion presence after the crash that had no presence before. Note that in some regions there is a positive change of greater than 10%. The black contours represent the weight function for the FIDA diagnostic in the fast-ion dominated wavelength range and the spatial location of measurement. 3 CF/20/236 Download
Figure 10(a)-10(f) Relative change in spectra after a sawtooth crash for a single channel over a number of averaged time windows. Relative change in the spectral radiance at R = 1.205 m in the device midplane, averaged over the indicated time windows. 4 CF/20/237 Download
Figure 11a Top-down schematic of a MAST plasma, with passive FIDA channels Available toroidally-viewing passive chords, with selected chord highlighted in red. The black circles show the minimum and maximum extent of the plasma. 2 CF/20/238 Download
Figure 11b Passive signal observed before, during and after a sawtooth crash Spike and decay of passive signal seen during a sawtooth crash. The decaying part of the signal has been fitted with an exponential. 1 CF/20/239 Download