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Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
AH! I just rememberd a photo I took of a flyback arc in a xenon flash tube, the arc spiraled around the inside of the tube from one end to the other. The reflection makes it look like a double helix but it is infact just one.
The arc stayed in that corkscrew shape until I moved or any one else came close, but the important part is there were no perminant magnets, its HF AC and its a corkscrew.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I've seen that double helix photo before, but never got around to trying it. Shouldn't be that hard to validate, I would guess if it is real the helix is caused by field shaping or something. It looks very low power though, there are no streamers considering the exposure time. There's no real info to go by, like size or anything but I might give it a try.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Terry Fritz wrote ...
.. Although the effect is commonly obsserved, I don't know of any "offical" real science papers on it. I should note that I found these pictures: Which do show the powerful magnet deflecting the streamers. So maybe my little experiment was just not setup right to really detect anything...
This photo looks to me to simple field repulsion and nothing to do with magnetism on an AC streamer. Take the magnet and leave the foil wrapper in place and I believe it would look the same. This is the same as a corona ring effect on inhibiting adjacent sparks. A magnet would act differently and tend to split the streamer however the action of the heated channel probably overwhelms and nullify the effect which is why we dont see it much.
blackplasma wrote ...
Wow, I can't believe I just read that. ...TDU, I know you've got a pic of a plasma discharge inside a tube distorted by a big speaker magnet... I've never been sure if it was because of the presence of the field, or the capacitive effect of a big metallish object against the glass?....
Its a magnetic effect. The physics dept has one that makes a beam turn full circle as a demo. Thats how they bend beams for synchrotrons and linear accelerators before they get to the linear part
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Ok, I tried the pyramid thing to see if I could get a corkscrew / double helix type effect.
The results are pretty much inconclusive, although it does seem to make the discharge point upwards in a straight line as opposed to bushing out. Coil is my maplin coil in CW mode, with about 12 volts on the bridge, 15 second exposure.
Doesn't really prove much, as it was only a 5 minute job - uses aluminium tape, random angles, and 3 sides
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
I'd say that it would have to be the same geometry as the great pyramid. I also seem to remember that it said somewhere that the coil was in a vacuum. Not so easy there if that is so. But interesting to note that the "corkscrew" effect could possible be controlled to a full spiral, if of course the picture has validity. All I know is that it has been on the net for a long time with not much info other than the keelynet article.
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DRSSTCs and Long Pulse arcs (corkscrew effect)
