Fluctuation spectra in the NASA Lewis bumpy-torus plasma

By: Nasa, National Aeronautics and Space Adm

The electrostatic potential fluctuation spectrum in the NASA Lewis bumpy-torus plasma was studied with capacitive probes in the low pressure (high impedance) mode and in the high pressure (low impedance) mode. Under different operating conditions, the plasma exhibited electrostatic potential fluctuations (1) at a set of discrete frequencies, (2) at a continuum of frequencies, and (3) as incoherent high-frequency turbulence. The frequencies and azimuthal wave numbers were determined from digitally implemented autopower and cross-power spectra. The azimuthal dispersion characteristics of the unstable waves were examined by varying the electrode voltage, the polarity of the voltage, and the neutral background density at a constant magnetic field strength. Singh, C. M. and Krawczonek, W. M. and Roth, J. R. and Hong, J. Y. and Powers, E. J. Glenn Research Center NASA-TP-1257, E-8696 RTOP 506-25

• Format: Paperback
• Language: English
• ISBN: 1720212414
• ISBN13: 9781720212416
• Release Date: January 1
• Publisher: Independently Published
• Length: 26 Pages
• Weight: 0.19 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"