21 Thomson Scattering: Electron heating ▶ Each 2D profile built from several (identical) shots with different vertical shift (P6). ▶ At later time (~5
{"Image DocumentName": "Thomson Scattering: Electron heating", "Image ImageDescription": "Ruby laser + P6 (vertical position) coils: 2D profile. Peaked Case: n = 1019 m-3 at 10.0 ms. Ruby TS laser. Hollow Case: n = 5 x 1018 m-3 at 10.0 ms. \u03c6. Each 2D profile built from several (identical) shots with different vertical shift (P6). At later time (~5 ms after merging) electron temperature still increasing. Significant electron heating often occurs after merging in a hollow structure. The 1-10 ms time-scale is in agreement with electron-ion equilibration time. \u03c4ie \u2248 0.2 ms   (Te [eV]/ T0)3/2 T0 = 10 eV. As well as 1D profiles at the midplane we also have some 2D profiles of electron temperature. Each of these figures is made up of several shots that are identical apart from the currents in the vertical position coils. So the Thomson Scattering laser is in a fixed position but the whole plasma is shifted vertically. There are two typical profiles, the peaked case.. at high density, and the hollow case .. at lower density. temperature continues to increase even after the merging has finished.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}