TRANSPORT IN MAGNETIZED PLASMAS INTERROGATED BY LCIF

1. TRANSPORT IN MAGNETIZED PLASMAS INTERROGATED BY LCIF DOE Plasma Science Center Control of Plasma Kinetics • 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 10 mTorr 30 mTorr 4 • Electron loss widths compared to computed ion, electron and hybrid gyroradii. • Measured Electron densities by LCIF and magnetic fields above magnetized electrode assembly HIGHLIGHT PLSC_0613

2. LASER LIGHT SCATTERING DURING PLASMA SYNTHESIS OF SILICON NANOPARTICLES DOE Plasma Science Center Control of Plasma Kinetics • 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 = 17.7 s t = 8.8 s t = 26.5 s upper electrode lower electrode t = 53.1 s t = 44.2 s t = 61.9 s t = 35.4 s HIGHLIGHT PLSC_0613