1. TRANSPORT IN MAGNETIZED PLASMAS INTERROGATED BY LCIF
Plasma transport magnetized low temperature plasmas is important to understand but challenging to diagnose. The plasma leak width through cusps at anodes contributes to loss of plasma.
Collaborative study to address fundamental issues about electron loss
Segmented, magnetized electrode to establish and quantify plasma confinement (A. Hubble and J. Foster, U. Michigan).
Laser Collisional Induced Fluorescence (LCIF) to interrogate plasma distribution (E. Barnat and B. Weatherford, SNL).
10 mTorr
30 mTorr 4
Measured Electron densities by LCIF and magnetic fields above magnetized electrode assembly
Electron loss widths compared to computed ion, electron and hybrid gyroradii.
DOE Plasma Science Center
Control of Plasma Kinetics
PLSC_0613
HIGHLIGHT 1

2. LASER LIGHT SCATTERING DURING PLASMA
SYNTHESIS OF SILICON NANOPARTICLES
Using a newly constructed plasma reactor and laser light scattering experiment, nucleation, growth and movement of silicon nanoparticles in a silane-argon plasma are being studied.
Periodic laser light scattering is observed from the nanoparticles as they nucleate, grow, become trapped above the electrode, and are finally swept out of the reactor with flow. The entire cycle repeats.
The mechanism of this phenomena is being studied by combining experiments with theoretical modeling.
t = 0 s
t = 8.8 s
t = 17.7 s
t = 26.5 s
upper electrode
lower electrode
t = 61.9 s
t = 53.1 s
t = 44.2 s
t = 35.4 s
DOE Plasma Science Center
Control of Plasma Kinetics
PLSC_0613
HIGHLIGHT 2