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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9486
DTSTART:20251203T203000Z
DTEND:20251203T223000Z
DTSTAMP:20260410T212410Z
LAST-MODIFIED:20251105T211149Z
LOCATION:Chamberlin Hall Room 5310
SUMMARY:Magnetically driven plasma jet experiments on the Big Red Ball
 \, Preliminary Exam\, Shreya Dwivedi
DESCRIPTION:Plasma jet experiments using planar coaxial electrodes wit
 h bias magnetic field\, emulating the    central object–accretion di
 sk system\, are conducted on the BRB at WiPPL. Hydrogen plasma jets   
  (density ∼ 1e+19m−3 at 11 ± 2eV) at high bias voltage (2–3kV) 
 are injected into different H plasma    backgrounds (density ∼ 1e+17
 m−3 at ∼ 5eV). Axial component Bz propagates downstream from the  
   gun\, undergoing collimation while elongating. The induced toroidal 
 field BÏ• shows pinching near the    column axis\, indicative of plasm
 a compression or helicity injection. The current density Jz is strongl
 y    collimated\, extending up to ∼ 90–100cm from the gun\, approx
 imately propagating along collimated    Bz lines. Later\, both Bz and 
 Jz distributions broaden and weaken\, suggesting relaxation or enhance
 d    interaction with the background plasma. This J − B topology is 
 consistent with earlier plasma jet    experiments. Bz with average pea
 k amplitude ∼ 240G remain collimated for longer durations when    je
 ts are launched into lower density plasma.: lasting ∼ 34μs at 1.0 Ã
 — 1e+17m−3 compared to ∼ 24μs    at 6.2 × 1e+17m−3 (each at 3k
 V bias). The propagation speed of Bz [90\, 76\, 46]km/s decreases with
     increasing background density ∼ [2.1\, 3.1\, 5.2] × 1e+17m−3\
 , for jets biased at 2kV.
URL:https://www.physics.wisc.edu/events/?id=9486
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