Collisionless cooling of perpendicular electron temperature in the thermal quench of a magnetized plasma
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866909369634914304 |
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| author | Zhang, Yanzeng Li, Jun Tang, Xianzhu |
| author_facet | Zhang, Yanzeng Li, Jun Tang, Xianzhu |
| contents | Thermal quench of a nearly collisionless plasma against a cooling boundary or region is an undesirable off-normal event in magnetic fusion experiments, but an ubiquitous process of cosmological importance in astrophysical plasmas. There is a well-known mismatch that what experimentally diagnosed is the drop in perpendicular electron temperature $T_{e\perp},$ but the parallel transport theory of ambipolar-constrained tail electron loss produces parallel electron temperature $T_{e\parallel}$ cooling. Here two collisionless mechanisms, dilutional cooling by infalling cold electrons and wave-particle interaction by two families of whistler instabilities, are shown to enable fast $T_{e\perp}$ cooling that closely tracks the mostly collisionless crash of $T_{e\parallel}.$ |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_08564 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Collisionless cooling of perpendicular electron temperature in the thermal quench of a magnetized plasma Zhang, Yanzeng Li, Jun Tang, Xianzhu Plasma Physics Astrophysics of Galaxies Thermal quench of a nearly collisionless plasma against a cooling boundary or region is an undesirable off-normal event in magnetic fusion experiments, but an ubiquitous process of cosmological importance in astrophysical plasmas. There is a well-known mismatch that what experimentally diagnosed is the drop in perpendicular electron temperature $T_{e\perp},$ but the parallel transport theory of ambipolar-constrained tail electron loss produces parallel electron temperature $T_{e\parallel}$ cooling. Here two collisionless mechanisms, dilutional cooling by infalling cold electrons and wave-particle interaction by two families of whistler instabilities, are shown to enable fast $T_{e\perp}$ cooling that closely tracks the mostly collisionless crash of $T_{e\parallel}.$ |
| title | Collisionless cooling of perpendicular electron temperature in the thermal quench of a magnetized plasma |
| topic | Plasma Physics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2312.08564 |