Being near Boston I have seen the MOS electric show a few times. I compiled some high voltage spark highlights in this video, from a couple of different angles. https://www.youtube.com/watch?v=KyJbVkQPCiY
As Ed mentioned you can see there is at least a full meter separation between the VDG DC spark pulses and the AC Tesla coil pulses. They actually have five Tesla coils here. The two solid state musical ones are on one side, there is also what I suspect is a rotary spark gap coil on the right, but the primary circuit is tucked away, and as you can see in the video there are also two vaccum tube coils with small vertical discharges. I have been in the Faraday cage of that exhibit as well, they elevate it for the VDG spark to the cage, then lower it back down after. The only time they have TC and VDG at the same time is the grand finale as shown at the end of the video.
Years ago I just did a thought experiment about a VDG, instead of an iron core transformer, charging up the capacitor to power a TC. After talking with someone on this list about it, they pointed out the current from a VDG is so small that the TC streamers would be one every few seconds or so at best, so I didn't try it. The only other place I heard of that is John Hutchinson (crackpot alert) using a combination of VDG and TC together for a long period (30 minutes to an hour or more?) to create the Hutchinson effect with anti gravity and solid materials becoming non-newtonian or liquid like.... If you google or search youtube for that, there's plenty of videos about it.
----------------------------------
Brian Hall
________________________________
From: Tesla <tesla-bounces@xxxxxxxxxx> on behalf of Ed <evp@xxxxxxxxxxx>
Sent: Sunday, November 13, 2016 3:26 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Tesla coil x Van de Graaff
I have had only one chance to see the big VDG run at the Boston MOS and
it was awesome to say least! The TC's, at least when i was there, were
far enough away from the VDG terminal that they could have no effect.
Almost worth a trip to Boston just to see that show, at least for those
of us who love arcs and sparks....
Ed
On 11/13/2016 5:17 AM, Antonio Queiroz wrote:
> Em 11/11/2016 03:04, jimlux escreveu:
>> On 11/10/16 4:08 PM, Antonio Queiroz wrote:
>>> Hello:
>>>
>>> Did someone see what happens if you operate a Tesla coil close to a Van
>>> de Graaff generator, of similar size?
>>>
>>> Antonio Carlos M. de Queiroz
>>>
>>>
>>
>> With the VDG running? Or just sitting there.
>>
>> I've run my table top TC next to a tabletop VDG (Science First with
>> the 14" spheroid top electrode). The VDG top accumulates charge and
>> you get some streamers reaching out towards it.
>>
>>
>> The Boston Museum Of Science show has a bunch of large (By TC
>> standards) coils running next to a very large VDG. When the VDG is
>> running, pretty much anything with curvature in the vicinity shows
>> corona streamers. I don't recall if there were any streamers or
>> phenomena from the sphere on the VDG when they were running the TC.
> Of course with the VDG running. I would expect some change in the
> shape of the streamers, as with one polarity the charge in them would
> be attracted while with the other it would be repelled by the VDG. But
> as the alternance is fast the effect is probably subtle. Corona around
> the VDG may be affected too, but this would be more difficult to see.
> I will try when the weather gets drier here.
>
> Antonio Carlos M. de Queiroz
>
>
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