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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-9841
DTSTART:20260917T190000Z
DTEND:20260917T210000Z
DTSTAMP:20260912T031122Z
LAST-MODIFIED:20260911T194446Z
LOCATION:B343 Sterling
SUMMARY:Magnetic Null Points Drifted by Magnetic Pressure and Tension 
 Forces\, Preliminary Exam\, Mary Yu\, Physics PhD Graduate Student
DESCRIPTION:In configurations observed in natural systems\, 3D magneti
 c null points often appear during magnetic reconnection. In the Terres
 trial Reconnection Experiment (TREX) implemented in the Big Red Ball (
 BRB)\, magnetic reconnection is studied under controlled conditions in
  the collisionless regime. The applied configuration includes a cylind
 rically symmetric reconnection layer imploding onto the central axis o
 f the experiment. The reconnection process ends as the reconnection la
 yer reaches the center axis characterized by the formation of a double
  null-point configuration. This presentation will discuss how the two 
 null points form\, the rapid separation along the experimental z-axis\
 , and the energy conversion due to field line shortening. A 16-tip Lan
 gmuir probe is used for collecting data of electron density\, electron
  temperature\, plasma potential\, etc. High fidelity B-dot probes are 
 used for collecting magnetic field data that resolve the dynamics at l
 ength scales much smaller than the ion skin-depth. The data has been p
 rocessed to show the propagation of current layer of magnetic reconnec
 tion and magnetic nulls. The data shows ions are accelerated to the sp
 eed of magnetic null moving speed. Interesting features are found in d
 ata such as the electron heating at reconnection exhaust\, two-fluid H
 all effects yielding both quadrupolar and octopolar structures in the 
 out-of-plane magnetic field.
URL:https://www.physics.wisc.edu/events/?id=9841
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