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Publication Figures

Publication Date:
0000-00-00

First Author:
Andrew Kirk

Title:
L-mode filament characteristics on MAST as a function of plasma current measured using visible imaging

Paper Identifier:
CP/15/441

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Figure Reference Title Description Number of Figure Data Items Identifier Download Figure Details
Figure 1 Simulation of effect of toroidal size of a filament on divertor profile Simulation of the effect that the toroidal size of a filament a) at the mid-plane has on b) the radial extent at the divertor shown as a function of distance from the LCFS. 0 CF/15/442 Download
Figure 2 Simulation of effect of filament characteristics on divertor profile Simulation of the effect that the mid-plane filament parameters for 30 filaments have on the radial divertor profile. 0 CF/15/443 Download
Figure 3 Operational space for filament study The operational space studied in terms of toroidal Field at the magnetic axis (BT) and plasma current for discharges in Connected Double Null (O) or Lower Single Null Diverted (? ) magnetic configurations. 0 CF/15/444 Download
Figure 4 fall off length as a function of plasma current The mid-plane fall off lengths of a) power and b) density as a function of IP determined from upper divertor measurements in the CDN discharges studied. 0 CF/15/445 Download
Figure 5 Background subtracted L-mode image Background subtracted image of a MAST L-mode plasma. The curved line superimposed on the image is the field line at the LCFS at a given toroidal location. The horizontal line is used to measure the radial propagation of the filaments. 0 CF/15/446 Download
Figure 6 example of filament finding algorithm Line integrated intensity as a function of toroidal angle. For each filament the toroidal location (vertical line) and the half width half maximum toroidal extent (horizontal line) determined are shown. 0 CF/15/447 Download
Figure 7 Distributions of mode number and toroidal and bi-normal filament size Normalised probability distribution of a) effective toroidal mode number, b) toroidal size and c) bi-normal size for two discharges with the same toroidal magnetic field and with plasma current of 400 kA (solid) and 900 kA (dashed). 0 CF/15/448 Download
Figure 8 Distribution of filament toroidal velocities Normalised probability distribution of the toroidal velocity of the filaments in the shot with IP=900 kA. 0 CF/15/449 Download
Figure 9 Effect of toroidal rotation on measured filament width Simulation of the effect on the toroidal rotation of the filament on the measured toroidal size a) a filament with a width = 5 cm, which has moved 2 cm during the exposure time of 3 ?micros b) the resulting smeared image produced with Gaussian fit (dashed line). 0 CF/15/450 Download
Figure 10 bi-normal filament width as a function of machine parameters Mean bi-normal filament size as a function of a) plasma current (IP), b) edge safety factor (q95) and c) parallel connection length (L//) in CDN (O) or LSND (?) magnetic configurations. 0 CF/15/451 Download
Figure 11 Distribution of filament radial size Normalised probability distribution of the radial size of the filaments for two discharges with the same toroidal magnetic field and with plasma current of 400 kA (solid) and 900 kA (dashed). 0 CF/15/452 Download
Figure 12 Radial filament size as a function of plasma parameters Mean radial filament size as a function of a) plasma current (IP), b) edge safety factor (q95) and c) parallel connection length (L//) in CDN (O) or LSND (?) magnetic configurations. 0 CF/15/453 Download
Figure 13 Bi-normal vs radial filament size 13 Bi-normal size versus radial size of filaments for the shot with IP=900 kA.The points with error bars represent the weighted mean of the data in that interval and the standard deviation of the distribution 0 CF/15/454 Download
Figure 14 Radial location of filaments as a fucntion of time The radial distance from the LCFS (dRLCFS) as a function of time for the individually identified filaments. 0 CF/15/455 Download
Figure 15 Intensity along radial chord The intensity along a radial chord (dRLCFS) and time. The superimposed lines show the trajectories that would be taken by filaments with different radial velocities. 0 CF/15/456 Download
Figure 16 distribution of radial velocities The probability distribution for the radial velocity determined by method 1 (dashed) and method 2 (solid) for the discharge with IP=400 kA. 0 CF/15/457 Download
Figure 16 Radial velocity distribution at IP 400 and 900 kA Normalised probability distribution of the radial velocity (Vr) of the filaments obtained using method 2 for two discharges with the same toroidal magnetic field and with plasma current of 400 kA (solid) and 900 kA (dashed). 0 CF/15/458 Download
Figure 17 Mean filament radial velocity as a fucntion of machine parameters Mean radial velocity (Vr) as a function of a) plasma current (IP), b) edge safety factor (q95) and c) parallel connection length (L//). Results using method 2 obtained in CDN (O) and LSND (?) magnetic configurations. 0 CF/15/459 Download
Table 1 Table of shots and shot parameters used in L-mode filament scaling paper Parameters for the L-mode discharges analysed in this paper: Shot number, analysis period, magnetic configuration (Connected Double Null (CDN) or Lower Single Null Diverted (LSND)), plasma current (IP), toroidal magnetic, field on axis (BT), line averaged density (ne) and injected neutral beam power (PNBI). 0 CF/16/72 Download