Experimental Studies Of Magnetic Reconnection In Laboratory

We review results from the most recent experiments in the past 2 decades inwhich magnetic reconnection has been generated and studied in controlled lab-oratory settings. Laboratory experiments are crucial for understanding the fun-damental physics of magnetic reconnection since they can provide well-correlatedplasma parameters at multiple plasma locations simultaneously, while satellitescan only provide information from a single location at a given time in a spaceplasma. We have already study detailed of the experimental device of magneticreconnection, summarize the results of magnetic reconnection in laboratory: re-connection model in collision plasma, the Hall e?ect and electron di?usion regionin collisionless plasma, ion acceleration and heating, the electrostatic and electro-magnetic ?uctuations in reconnection, electromangetic radiation in reconnection.But there are many issues need in-depth study in laboratory, such as the electronacceleration and heating, particle heating mechanisms, fast reconnection model,boundary condition of reconnection and 3D e?ect of reconnection.Based on the Linear Magnetized Plasma device(LMP) of University of Scienceand Technology of China, a experimental device of magnetic reconnection is estab-lished: built the Helicon plasma source, compared to the original filament source itcan produced the higher plasma density; design the current plate for magnetic fieldtopologies of reconnection, and developed a large pulse current sources, increasethe current of plate, drive the plasma in?ow, produced the magnetic reconnec-tion process; built the movable system in 2D cross section and the basic diagnostictools, magnetic probe, electrostatic probe and other. We can measured the plasmaparameter distribution through the moving of probe in 2D cross section; build dataacquisition systems, achieve the automation of the discharge system and the dataacquisition system, through the output of computer's serial port, using matlabprocess control the time of Helicon discharge and the time of apply of pulse cur-rent, and same time control the collection of acquisition system, greatly simplifiesthe workload of data collection in the whole cross section.After completed of all preparations, we completed the work of the debugging of the whole system. The peak current in each current plate reached 3000A,we received the magnetic field distribution in vacuum and plasma by magneticprobe, obtained the common ?ux and plasma current in experiment. There is nocurrent generation in current plate, but in current bar, the magnitude of axialcurrent is found to scale with the number of passing particles. Parallel electricfield is measured by emissive probes, the existence of a large electric field relatedto the reconnection process is verified. Magnetic ?ux doesn't pile up because ofthe parameter region in our case, which is consistent with the result of numericalsimulation.Plasma density is measured by electrostatic probes in the cross section, in-creased the pulse current, found the change of distribution of plasma densityby cylindrical symmetric distribution into a tilt-shaped, and the direction of tiltchange with the direction of pulse current,direction of the axial magnetic field,and the direction of the plasma source. After analysis, the tilt of plasma densitydecided by the shape of the 3D magnetic field, due the di?usion of plasma in axial,the distribution of plasma density has changed.