Three-dimensional structure of radiative cooling in impurity seeded plasmas in the Large Helical Device

Three-dimensionally localization of radiative cooling due to nitrogen (N2) seeding for divertor detachment was detected experimentally. Since the localization along some magnetic field lines induces toroidal asymmetry of heat load reduction on divertor plates, it should be avoided for fusion reactors. The three-dimensionally localized structure was extracted using Principal Component Analysis (PCA) from two-dimensional radiation images measured with an InfraRed imaging Video Bolometer (IRVB). By applying PCA to 34 images each in N2 seeded plasmas with toroidally-asymmetric heat load reduction and in neon (Ne) seeded plasmas with toroidally-symmetric heat load reduction, a radiation feature in N2 seeded plasmas was found as one of the principal components (PC). The three-dimensional transport code EMC3-EIRENE indicated that the ionization in one of the divertor legs is enhanced in nitrogen seeding compared with Ne seeding due to the difference in the first ionization energy. The magnetic field lines from the divertor leg were along the extracted radiation structure and were terminated by the divertor where the heat load decreased due to the N2 seeding. These results indicate that three-dimensionally localized structure of radiative cooling was detected experimentally

munechika-koyo/cherab_inversion: v0.1.5 Release

<h2>What's Changed</h2> <ul> <li> Update switcher.json by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/12</li> <li> Change version management system by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/13</li> <li> Fix a MFR bug and add tests by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/15</li> </ul> <p><strong>Full Changelog</strong>: https://github.com/munechika-koyo/cherab_inversion/compare/v0.1.4...v0.1.5</p&gt

munechika-koyo/cherab_inversion: v0.1 Release

<p>This is the first release after separating inversion functionalities from <code>cherab.phix</code></p> <h2>What's Changed</h2> <ul> <li>1st PR by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/1</li> <li>:memo: Add examples and rename to <code>core</code> module by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/2</li> <li>:memo: Add MFR notebook by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/3</li> <li>:construction_worker: Update CI workflows by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/4</li> <li>:construction_worker: fix cibuildwheel config by @munechika-koyo in https://github.com/munechika-koyo/cherab_inversion/pull/5</li> </ul> <h2>New Contributors</h2> <ul> <li>@munechika-koyo made their first contribution in https://github.com/munechika-koyo/cherab_inversion/pull/1</li> </ul> <p><strong>Full Changelog</strong>: https://github.com/munechika-koyo/cherab_inversion/compare/v0.1.dev0...v0.1</p&gt