Final Report for DoE Grant DE-FG02-06ER54878, Laboratory Studies of Reconnection in Magnetically Confined Plasmas

Jan Egedal-Pedersen

关键词: BOUNDARY CONDITIONS;    CONFIGURATION;    KINETICS;    MAGNETIC FIELDS;    MAGNETIC RECONNECTION;    MAGNETOTAIL;    PHYSICS;    TRAJECTORIES;    TRAPPED ELECTRONS plasma;    collisionless magnetic reconnection;    Versatile Toroidal Facility;   

DOI  :  10.2172/1030564
RP-ID  :  DOE/ER/54878-F
PID  :  OSTI ID: 1030564
Others  :  TRN: US1202105

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

The study of the collisionless magnetic reconnection constituted the primary work carried out under this grant. The investigations utilized two magnetic configurations with distinct boundary conditions. Both configurations were based upon the Versatile Toroidal Facility (VTF). The first configuration is characterized by open boundary conditions where the magnetic field lines interface directly with the vacuum vessel walls. The reconnection dynamics for this configuration has been methodically characterized and it has been shown that kinetic effects related to trapped electron trajectories are responsible for the high rates of reconnection observed. This type of reconnection has not been investigated before. Nevertheless, the results are directly relevant to observations by the Wind spacecraft of fast reconnection deep in the Earth magnetotail. The second configuration was developed to be specifically relevant to numerical simulations of magnetic reconnection, allowing the magnetic field-lines to be contained inside the device. The configuration is compatible with the presence of large current sheets in the reconnection region and reconnection is observed in fast powerful bursts. These reconnection events facilitate the first experimental investigations of the physics governing the spontaneous onset of fast reconnection. In this Report we review the general motivation of this work, the experimental set-up, and the main physics results.