# Published Data

### 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.

### Publication Figures

Publication Date:

0000-00-00

First Author:

Luke Easy

Title:

Investigation of the Effect of Collisionality on Scrape Off Layer Filaments using Three Dimensional Simulations

Paper Identifier:

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Figure Reference | Title | Description | Number of Figure Data Items | Identifier | Download Figure Details | ||
---|---|---|---|---|---|---|---|

Figure 1 | Fig 1. Equilibrium Fields | 1 | CF/15/269 | Download | |||

Figure 2 | Fig 2. Reference case v_f vs delta_perp | Dependence of the characteristic radial velocity, v_f , on its initial perpendicular length scale ??. The analytical scaling estimates for the inertial and sheath current regimes are also plotted for comparison. | 0 | CF/15/271 | Download | ||

Figure 3 | Fig 3. Reference case current balance delta_perp = 28 | Divergence of each current density divided by particle density, from the reference case ?? = 28 filament at various perpendicular planes along the the field line. The quantities are plotted at the time at which the filament’s characteristic radial velocity, v_f , occurred. | 0 | CF/15/274 | Download | ||

Figure 4 | Fig 4. J_parallel comparison | Structure of J_parallel in a y ? z plane through the middle of ?? = 28 filaments at the time of their peak radial velocities. The left, centre and right plots respectively correspond to the reference case, the enhanced target localised resistivity nu_{parallel div} = 10000nu_{parallel0} case, and the uniformly enhanced resistivity ?? = 2500nu_{parallel0} case filaments. Each case is plotted at the time at which the filament’s characteristic radial velocity, v_f , occurred. | 0 | CF/15/275 | Download | ||

Figure 5 | Fig 5. Reference case current balance delta_perp = 5 | Divergence of each current density divided by particle density, from the reference case ?? = 5 filament at various perpendicular planes along the the field line. The quantities are plotted at the time at which the filament’s characteristic radial velocity, v_f , occurred. | 0 | CF/15/276 | Download | ||

Figure 6 | Fig 6. v_f vs delta_perp for enhanced sheath localised resistivities | Dependence of the characteristic radial velocity, v_f , on its initial perpendicular length scale ?? for each of the values of nu_{parallel div }used in the enhanced target localised resistivity scan. | 1 | CF/15/277 | Download | ||

Figure 7 | Fig 7. Current Balance delta_perp = 28, Enhanced sheath localised resistivity | Divergence of each current density divided by particle density, from the enhanced target localised resistivity ?? = 28, nu_{parallel div} = 10000 nu_{parallel 0} filament at various perpendicular planes along the the field line. The quantities are plotted at the time at which the filament’s characteristic radial velocity, v_f , occurred. | 0 | CF/15/278 | Download | ||

Figure 8 | Fig 8. Comparion of the Potential difference between the mid plane and the sheath for low and high resistivities | Potential difference formed between the mid-plane and sheath, ?_{-}(z=L_parallel/2) ? ?_{-}(z=L_parallel) , in ?? = 100 filaments, at the time of their peak radial velocity. The left and right hand plot respectively the reference nu_parallel = nu_{parallel 0} and enhanced resistivity nu_{parallel div}= 1000nu_{parallel 0} cases. Each quantity is plotted at the time at which the filament’s characteristic radial velocity, v_f occurred. | 0 | CF/15/279 | Download | ||

Figure 9 | Fig 9. v_f vs Gamma_{sheath} + Gamma_parallel for a delta_perp = 100 filament | Dependence of a ?? = 100 filament’s characteristic radial velocity, v_f , on Gamma_{sheath} + Gamma_parallel. With the exception of the highest Gamma_{sheath} + Gamma_parallel point for each data series, in which polarisation currents were not negligible, a linear dependence of v_f on Gamma_{sheath} + Gamma_parallel is displayed. Gamma_parallel was scaled by a factor of 0.75 when plotting the uniform nu_parallel data series, to account for the fact that the effective resistance to parallel currents travelling to the sheath from the midplane at z = 0 is approximately double that from the front of the filament at z ? L_parallel/2. | 0 | CF/15/280 | Download | ||

Figure 10 | Fig 10. delta_perp – Gamma_parallel regime plot | Diagram of each filament regime location in Gamma_parallel ? ?? space. The measured locations of the transition from the inertial regime, ??, for different values of Gamma_parallel are plotted using markers, whilst the analytical prediction from Reference 17 for the location of ?? is plotted using a solid black line. The horizontal dashed lines mark the values of Gamma_parallel corresponding to those used in the sheath localised and uniform resistivity scans, with the colours of the lines matching the colours of the markers used for their associated dataset in Figures 6 or 11. | 0 | CF/15/281 | Download | ||

Figure 11 | Fig 11. v_f vs delta_perp for enhanced uniform resistivity | FIG. 11. Dependence of the characteristic radial velocity, v_f , on its initial perpendicular length scale ?? for each of the values of nu_parallel used in the uniformly enhanced resistivity scan. | 1 | CF/15/282 | Download | ||

Figure 12 | Fig 12. Current Balance delta_perp = 28, Uniform sheath localised resistivity | Divergence of each current density divided by density, from the uniformly enhanced resistivity case ?? = 28,nu_parallel = 2500nu_{parallel 0} filament at various perpendicular planes along the the field line. The quantities are plotted at the time at which the filament’s characteristic radial velocity, v_f occurred. | 0 | CF/15/283 | Download | ||

Figure 13 | Fig 13. Density structure in x-z plane of enhanced sheath localised and uniform resistivities for delta_perp = 28 filaments | Comparison of the structure of the density pertur- bation, n_f , in an x ? z plane through the middle of filaments using enhanced target localised resistivity nu_{parallel div} = 10000nu_{parallel0} and uniformly enhanced resistivity nu_parallel = 2500nu_{parallel0}. Both fila- ments were initialised with ?? = 12 and are shown at the time at which their characteristic radial velocities occurred. The values of resistivity are such that ?? is approximately equal in both cases. Ballooning is exhibited in the nu_parallel = 2500nu_{parallel0}. | 0 | CF/15/284 | Download | ||

Figure 14 | Fig 14. v_x vs t at various positions along the field line for delta_perp = 12 filaments at different resistivities | Drift plane radial velocity, v_x, plotted against time at various positions along the field line, for ?? = 12 filaments. The top, middle and bottom plots respectively correspond to the reference resistivity case, the uniformly enhanced resistivity nu_{parallel} = 2500nu_{parallel 0} case and the enhanced sheath localised resistivity nu_{parallel div} = 10000nu_{parallel 0} case. Ballooning is exhibited in the nu_{parallel} = 2500nu_{parallel 0} case. | 0 | CF/15/285 | Download | ||

Figure 15 | Fig. 15. Estimate of u_{parallel div} as function of T_e | Estimate of relative magnitude of the normalized collisionality in the divertor region, nu_{parallel div}, (and each of its constituent terms, nu_{parallel div}^{ei} and nu_{parallel div}^{en}) compared to nu_{parallel 0} as a function of temperature in the divertor, T_{e}^{div}. | 0 | CF/15/317 | Download | ||

Table 2 | Table 2. Estimated divertor temperature required to produce the values of u_{parallel div} used | Estimated divertor temperature required to produce the values of $nu_{parallel div}$ used in the sheath localised enhanced resistivity scan | 0 | CF/15/318 | Download | ||

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