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Title: Structure of a magnetic flux annihilation layer formed by the collision of supersonic, magnetized plasma flows

We present experiments characterizing the detailed structure of a current layer, generated by the collision of two counter-streaming, supersonic and magnetized aluminum plasma flows. The anti parallel magnetic fields advected by the flows are found to be mutually annihilated inside the layer, giving rise to a bifurcated current structure—two narrow current sheets running along the outside surfaces of the layer. Measurements with Thomson scattering show a fast outflow of plasma along the layer and a high ion temperature (Ti~¯ZTe, with average ionization ¯Z=7). Lastly, analysis of the spatially resolved plasma parameters indicates that the advection and subsequent annihilation of the in-flowing magnetic flux determines the structure of the layer, while the ion heating could be due to the development of kinetic, current-driven instabilities.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [1] ;  [1] ;  [5] ;  [6] ;  [1] ;  [7] ;  [1] ;  [1] ;  [1]
  1. Imperial College, London (United Kingdom)
  2. Imperial College, London (United Kingdom); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Sorbonne Univ., Paris (France); PSL Research Univ., Paris (France)
  4. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  5. Xi'an Jiaotong Univ., Xi'an (China)
  6. China Academy of Engineering Physics, Mianyang (China)
  7. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-697686
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
AC52-07NA27344; F03-02NA00057; SC-0001063
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING
OSTI Identifier:
1346128
Alternate Identifier(s):
OSTI ID: 1254891