Re: Magnequench RSG (was magnetic field with flat spiral)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "marc metlicka by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>

Dave,
(snipped)

> 
> This was a dramatic demonstration of the magnetic blowout principle, in a
> very cobbled up affair.  That why my comment of a C magnetic structure
> with even ceramic magnets may provide enough field intensity to be beneficial
> with quenching on the main HV electrodes of a RSG (AS or S)


  I'm sorry if you misunderstood my intention, I agree with you totally
and await your results with enthusiasm.
 I was actually thinking out loud, (or with my finger). I'm wondering if
the slight delay that it takes to energize the core of an electromagnet,
would allow the arc to initiate with full current potential and then the
electromagnet would smoothly extinguish it?
  I did put a magnetron magnet under the electrodes of the stsg once, it
seemed to work just as well as a strong air source. I posted it in a
long posting on the triggered gap last year, it was mixed in with a
bunch of the first stsg results (way back when no one would consider the
stsg idea)?
 I would like to try this electromagnet idea in the near future, it may
solve a problem i'm having with the 13khz coils gap, we'll see.
 But i never meant to show disrespect to you, please forgive?
Take care,
Marc M.


> 
> Regards
> Dave Sharpe, TCBOR
> Chesterfield, VA. USA
> 
> Tesla list wrote:
> 
> > Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <evp-at-pacbell-dot-net>
> >
> > > > David Sharpe wrote:
> > > >
> > > > > Ed
> > > > > Not doubting may have to go to NIB or SaCo to get
> > > > > BH product high enough to do the job.  However if
> > > > > I mount in a 'C' magnetic armature (1), and shape pole
> > > > > faces to focus what magnetic flux we got (2), we may be
> > > > > surprised at the available flux density.  The magnetron
> > > > > ring magnets are cheap, compared to a rare earth, and
> > > > > magnetic quenching was captured on a video tape at
> > > > > Richards nearly 8 years ago, using a WWII Alnico
> > > > > magnetic radar magnet.  These modern ferrite magnets
> > > > > are at least 3X to 5X stronger then first (and second)
> > > > > generation alnico products.  Worth giving it a whack
> > > > > and see what falls out of it.
> >
> >         Not having access to that tape, and being too cheap to buy it,
wonder
> > if you could just give a word summary of what happened? Not sure what
> > WWII magnetron magnet you used.  Typical flux density for the S-Band
> > maggies was about 1000-1500 gauss across a gap of the order of 1-1/4",
> > and for X-Band it was about 2500 gauss across a gap of the order of
> > 5/8".  I don't have my magnetic properties handbook here at home, but
> > think you're mistaken about the relative magnetizing power of the
> > ferrite and alnico magnets.  If I can remember I'll take a look at that
> > next week.  By the way, one of the permanent magnetic materials
> > companies has some excellent reference data on magnets on its web page,
> > but that is also bookmarked at work and not at home.  They most
> > specifically compare the ferrites and more modern rare-earth magnets
> > with the various alnico's and nickel-iron.
> >
> > > How about electromagnets? The time delay between initial current pulse
> > > and magnetic activity would give an interesting twist to "tuning"?
> > >  I think the diac\Triac pair would work, but then a real circuit?
> > > I like it!
> > >
> > > Marc M.
> >
> >         Electromagnets were used for quenching during the entire era of ARC
> > transmitters.  They were hooked in series with the arc and thus provided
> > the stabilizing effect of series inductors.  The current in the magnet
> > varied as the arc current varied, which may have provided some sort of
> > current regulation, though don't remember seeing any discussion about
> > that.  No doubt that electromagnets would work in Dave's application and
> > have the advantage of adjustability, but it would take a lot of a magnet
> > to equal what those little permanent magnets can do!
> >
> > Ed