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4hv.org :: Forums :: High Voltage
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450KV 225nF marx bank questions

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colin heath
Wed Mar 06 2013, 09:08PM Print
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
Hello All,

I am about to start building a 10 stage 450kv marx bank. this thing will be 225nf per stage capacitance using pulse caps. Obviously this is seriously high power and am looking to throw some ideas about regarding protection of electrical equipment in vicinity!!! I am assuming nasty induced voltages and some serious noise.

should this beast be inside a faraday cage? my suspicion is yes.

Cheers,

Colin
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Ash Small
Thu Mar 07 2013, 02:42AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Now this I have to see. Are you still at the same place, Colin?
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teravolt
Thu Mar 07 2013, 04:21AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
hi Colin I built these marxes

Link2

and I got to about 800kv with 3.5ft arcs and with these caps it went off like a gunshot and to fast to see. it is a fun and dangerous project. it started getting to heavy to move so it will have to be built in sections I hope to finish it some day. You should make some shorting sticks so you can short one cap at a time case you lose some charging resistors. EMP is a pausiblity so a open or shielded place is a good idea. so all expensive equipment should be unpluged and put away. what do the caps look like
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vircator
Thu Mar 07 2013, 06:32AM
vircator Registered Member #3217 Joined: Mon Sept 20 2010, 06:14AM
Location: Switzerland
Posts: 15
Colin

What kind of capacitors do you use?
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colin heath
Thu Mar 07 2013, 09:25AM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
Ash Small wrote ...

Now this I have to see. Are you still at the same place, Colin?
Hi Ash,

Yeah still same place, feel free to pop over once I have this built would be good to catch up!

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colin heath
Thu Mar 07 2013, 10:18AM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
Here are the caps
1362651508 123 FT151504 Image
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colin heath
Thu Mar 07 2013, 10:23AM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
teravolt wrote ...

hi Colin I built these marxes

Link2

and I got to about 800kv with 3.5ft arcs and with these caps it went off like a gunshot and to fast to see. it is a fun and dangerous project. it started getting to heavy to move so it will have to be built in sections I hope to finish it some day. You should make some shorting sticks so you can short one cap at a time case you lose some charging resistors. EMP is a pausiblity so a open or shielded place is a good idea. so all expensive equipment should be unpluged and put away. what do the caps look like
Yes I think shielding is going to be needed so may build a faraday cage. Yes the discharge probe is going to be important. Safety around this is going to be essential.

Nice lookingmarx there and love the multiplier design :)
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colin heath
Thu Mar 07 2013, 12:54PM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
OK I am already talking myself out of this project! All the effort and cost then what will be left? A unit so powerful I cant fire it at home or if i do maybe wipe out electronics, blow things to pieces.
Then after firing a few times what do I do with it? A tesla coil discharge is fully visible and exciting whereas the marx is likely going to flash so quick and so loud i wont see much.

Maybe a seriously powerful accelerator of some kind woul dbe more interesting?
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Ash Small
Thu Mar 07 2013, 02:54PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
colin heath wrote ...

Maybe a seriously powerful accelerator of some kind woul dbe more interesting?

I'd collaborate with you on that, Colin, I'm building one myself, and I'm only ten or twelve miles from you now.
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colin heath
Thu Mar 07 2013, 03:23PM
colin heath Registered Member #123 Joined: Fri Feb 10 2006, 12:58PM
Location:
Posts: 162
Hi Ash, that sounds like a plan. Are you talking particle or metal object accelerator though :)
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