Anomalous heating and plasmoid formation in a driven magnetic reconnection experiment
Journal Article
·
· Physical Review Letters
- Imperial College, London (United Kingdom)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- PSL Reserch Univ., Paris (France)
- Imperial College, London (United Kingdom); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Northwest Institute of Nuclear Technology, Xi'an (China)
- Xi'an Jiaotong Univ., Shaanxi (China)
- China Academy of Engineering Physics, Mianyang (China)
We present a detailed study of magnetic reconnection in a quasi-two-dimensional pulsed-power driven laboratory experiment. Oppositely directed magnetic fields (B=3 T), advected by supersonic, sub-Alfvénic carbon plasma flows (Vin = 50 km/s), are brought together and mutually annihilate inside a thin current layer (δ = 0.6 mm). Temporally and spatially resolved optical diagnostics, including interferometry, Faraday rotation imaging, and Thomson scattering, allow us to determine the structure and dynamics of this layer, the nature of the inflows and outflows, and the detailed energy partition during the reconnection process. We measure high electron and ion temperatures (Te = 100 eV, Ti = 600 eV), far in excess of what can be attributed to classical (Spitzer) resistive and viscous dissipation. Finally, we observe the repeated formation and ejection of plasmoids, consistent with the predictions from semicollisional plasmoid theory.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344; SC0001063
- OSTI ID:
- 1347671
- Alternate ID(s):
- OSTI ID: 1344617
- Report Number(s):
- LLNL-JRNL--704068
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 118; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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