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Re: Useless questions



Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

read us patt.645,576 to read TESLA's  thoughts on ion clouds.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Fri, 01 Mar 2002 08:10:00 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: Useless questions
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Fri, 1 Mar 2002 08:15:32 -0700
> 
> Original poster: "Paul Nicholson by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <paul-at-abelian.demon.co.uk>
> 
> [3cm radar scattering from topload]
> Having thought about this, and after a bit of reading, it seems
> that ionised gas molecules in the vicinity would not be expected
> to contribute either to a radar return, or to enhancement of
> subsequent streamer formation.  It needs the greater mobility
> of free electrons to perform both functions.  In view of the
> very short time that free electrons can survive, we would therefore
> not expect to be able to use a simple radar to look for any
> effects persisting between RF cycles, or between bangs.  Such
> things as hot air channels, etc, would not show up on the radar.
> 
> But that still leaves open the possibility of using the returns'
> doppler beat to detect the advancing 'front' of the streamers.
> 
> Jim wrote:
>> the mixer diodes in these things (being optimized for doppler in
>> the audio range) probably don't have that kind of bandwidth (in
>> terms of parasitic C and R, forming a low pass filter..
> 
> Yes, I see the problem.
> 
> Moving in a different direction then...
> 
> Can we shine a bright light across the topload to illuminate a
> screen?  Hot air channels caused by streamers might be visible
> as slightly darker lines on the screen, since light passing through
> a hot channel would be scattered by the altered refractive index.
> 
> Then, if the screen was viewed by a TV camera, frames grabbed both
> during a bang, and between bangs, might give firm evidence that
> these hot channels persist between bangs, and might even show
> them being re-used at the next bang.
> 
> It might not be too easy to grab frames synchronously at two or more
> times the bps rate, but if frames were grabbed asynchronously, they
> could be sorted out if the primary gap was also visible in the
> image.  I recollect this kind of thing has been talked about before,
> but I don't know if it's been tried.
> --
> Paul Nicholson
> --
> 
> 
>