Advanced Laser and RF Plasma Sources and Diagnostics
Abstract
We have made substantial research progress during the past three years with highlights including: Measurements of 193 nm (6.42 eV photon) laser quantum-resonant multi-photon absorption and ionization (REMPI) processes in air that produce breakdown (n> 10(exp 14)/cc) for rf moderate density (10(exp 12)/cc), sustainment at lower(< 2 kW) coupled power levels with 200 cc volumes. Millimeter wave interferometry and optical emission spectroscopy measurements of laser focused seed air plasmas with improved matching for rf-sustainment have produced high densities (ne > 10(exp 12)/cc ), at much higher initial pressures (80 torr) than can be obtained with rf alone (45 torr). Production of plasma rf self bias accelerated argon ion beams with the highest beam energies per Watt in the literature (165 eV at 500 W rf power). This accomplishment includes substantially exceeding the research results of helicon double layer ion acceleration research from Australia, Europe, Russia and the United States, including a detailed descrition axial ion beam evolution. The results of this research are described in six reviewed scientific journal articles in the Physics of Plasmas, the Journal of Applied Physics and the IEEE Journal of Plasma Science.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2013
- Accession Number
- ADA580392
Entities
People
- John Scharer
Organizations
- University of Wisconsin–Madison