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Shiga, Nobuyasu

Works: 3 works in 4 publications in 1 language and 7 library holdings
Roles: Author
Publication Timeline
Publications about Nobuyasu Shiga
Publications by Nobuyasu Shiga
Most widely held works by Nobuyasu Shiga
Experimental studies of thermal fluctuations in electron plasmas by Nobuyasu Shiga( file )
2 editions published in 2004 in English and held by 5 libraries worldwide
Landau Damping of Electron Plasma Waves in the Linear and Trapping Regimes ( Book )
1 edition published in 2002 in English and held by 1 library worldwide
Linear Landau damping and nonlinear wave-particle trapping oscillations are observed with m(sub theta) = 0 standing plasma waves (Trivelpiece-Gould modes) in a trapped pure electron plasma. The measured linear damping rate (10 (exp -3 </^gamma/omega </^ 10 (exp -1) agrees quantitatively with Landau damping theory for moderate plasma temperatures (1 <T <3 eV), and exceedingly low wave amplitudes (delta n/n <10 (exp -6). At larger amplitudes, the wave initially damps at the Landau rate, then develops trapping oscillations at frequency ohm(sub tr), causing the effective damping rate to decrease with amplitude as first predicted by O'Neil in 1965. For comparison, the measured damping rate is observed to decrease dramatically when the resonant particles are eliminated by truncating the nominally Maxwellian velocity distribution
Thermal Excitation of Trivelpiece-Gould Modes in a Pure Electron Plasma ( Book )
1 edition published in 2002 in English and held by 1 library worldwide
Thermally excited plasma modes are observed in trapped, near-thermal-equilibrium pure electron plasmas over a temperature range of 0.05 <T <5 eV. The measured thermal emission spectra together with a separate measurement of the wave absorption coefficient uniquely determines the temperature. Alternately, kinetic theory including the antenna geometry and the measured mode damping (i.e. spectral width) gives the plasma impedance, obviating the reflection measurement. This non-destructive temperature diagnostic agrees well with standard diagnostics, and may be useful for expensive species such as anti-matter
English (4)
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