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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Building a railgun

Author Post
Plasma
Sat Jan 14 2017, 04:05AM Print View
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 15
I'm constructing a railing.

The power supply is a 15kv Nst, that goes throught a capacitive voltage divider, after the bridge rectifier it's around 9kv.
The capacitor bank has 12 microwave capacitors, 4 in series, with 3 parallel.

The rails are kept short and replaced with a permanent magnetic under the plastic drum.

The pellet moves around 1-5mm per arc.







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klugesmith
Sun Jan 15 2017, 04:12PM
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1478
Welcome back, Andrew. It's good to see you moving from ideas to real experiments with measured results.

Your picture shows a primitive electromagnetic motor, not a railgun (or railing, at least none obvious).
That's assuming a horizontal electric current in projectile, perhaps connected to fixed electrodes by sparks.

If there's a vertical magnetic field from your permanent magnet, projectile will be forced sideways.
I bet you can improve the outcome by making a better magnetic field. e.g. pole pieces, magnets on both top and bottom, permeable yoke connecting the far ends of magnets, etc.

How about the frame and ring-shaped magnets from a MWO magnetron, reassembled after you remove the electron tube and cooling fins?
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Plasma
Sat Jan 21 2017, 01:28AM
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 15
I've added a better magnetic path and more capacitors, every arc now consistently moves the pellet.

I collect about 4 capacitor a week, one layer has 24 caps, and aiming for five layers, per sparkgap
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Plasma
Sat Jan 21 2017, 01:32AM
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Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 15
Sorry for the double post having trouble posting pictures



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Dr. Slack
Sat Jan 21 2017, 07:47AM
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1564
mods, move to the projectiles board perhaps?
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Kizmo
Sat Jan 21 2017, 03:41PM
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 621
Moved :)
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Plasma
Sat Jan 28 2017, 02:32AM
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 15
Thanks Kludgesmith, it made the most improvement, see another thread.
I've finished the first layer, and plan to workout how to build the gun.
At the moment I've got a hot ionized alkali metal to pass between the electrodes, when the bank is full charged.

Don't really have much to add, it's only being 4-5 week on this project and there's heap to go throughout.

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Plasma
Sun Jan 29 2017, 04:00AM
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 15
In between these picture's the camera get blind, it looks like the arc goes back towards the potassium carbonate source



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Conundrum
Fri Feb 17 2017, 04:51AM
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: Republic of Guernsey
Posts: 3765
Nice!
How do you plan to avoid rail damage?
Also I speak for a lot of others when I say please be VERY careful.
With capacitors this big you won't survive even an indirect shock.

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