TRANSPORT IN MAGNETIZED PLASMAS INTERROGATED BY LCIF

DOE Plasma Science CenterControl of Plasma KineticsPLSC_0613 HIGHLIGHT

Measured Electron densities by LCIF and magnetic fields above magnetized electrode assembly

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).

Electron loss widths compared to computed ion, electron and hybrid gyroradii.

10 mTorr 30 mTorr4 10 mTorr

LASER LIGHT SCATTERING DURING PLASMASYNTHESIS OF SILICON NANOPARTICLES

DOE Plasma Science CenterControl of Plasma KineticsPLSC_0613 HIGHLIGHT

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

t = 35.4 s

upper electrode

lower electrode

t = 44.2 st = 53.1 st = 61.9 s