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SUMMARY:Electrostatic mode identification from a generalized wave-admittan
 ce vector
DTSTART:20170707T103000
DTEND:20170707T113000
DTSTAMP:20260408T033949Z
UID:217102f8ea7c8734d39e06affb40378859098b56bd8e0cdb62bc6a81
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. F. Skiff\, Dept. of Physics and Astronomy\, Univ. of Iow
 a\, Iowa City\, USA\nWe show how cross-correlation of the fluctuations in 
 LIF between two laser beams exciting optically isolated metastable lines c
 an be used to identify and separate the power spectra of plasma electrosta
 tic modes while using only a single measurement location.  A matrix of me
 asurements of:\n \nC(v\,v'\,t')= <df(x\,v\,t)df(x\,v'\,t-t')>t\,\n \nFou
 rier transformed over the time delay t'\, produces a Hermitian matrix when
  the two laser systems are tuned to the same set of Doppler-selected veloc
 ities.  We consider the effects of electrostatic waves on the LIF cross-c
 orrelation matrix.  Broad-band electrostatic waves are excited using a ca
 pacitive antenna driven with electrical white noise in a singly-ionized we
 akly-collisional ArII plasma column produced by a low power inductively co
 upled plasma source.\n \nModes can be identified by a generalized wave ad
 mittance which comes from the eigenvectors of the cross-correlation matrix
 .  We demonstrate the connection between this generalized impedance and t
 he usual definition.  Other extensions of the technique will be considere
 d.
LOCATION:PPB019
STATUS:CONFIRMED
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