Best way to produce 1 million volts dc

  • #1

Main Question or Discussion Point

I'm wanting to build a dc power source of 1 million volts more would be nice but ill start with a million and work my way up from there. Any suggestions would be helpufull. Is it possible to build a 1 million volt capacitor or should i build a capacitor bank to smooth out the ac current after its rectified or do you have a better suggestion for me. I'm wanting to build a coil gun with 1 million volts and not have to wait for capacitors to charge all the time just want to have a high voltage supply and fire it whenever. Any help will be greatly appreciated.
 

Answers and Replies

  • #2
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5
There are two basic methods to get 1 million volts DC. One way is to use the Van de Graaff approach with a moving belt. An example of this are the Emporer tandems (made by High Voltage Engineering), which have exceeded 10 million volts terminal voltage. See
http://en.wikipedia.org/wiki/Van_de_Graaff_generator
The other way is to use the Cockroft-Walton (or Marx generator) approach with a stack of high voltage diodes and capacitors for voltage multiplication. See
http://en.wikipedia.org/wiki/Cockcroft-Walton_generator
http://en.wikipedia.org/wiki/Marx_generator
 
  • #3
i don't know much about those i'm looking for a constant dc power supply though not something i have to wait to charge back up or anything just something thats always there.
 
  • #4
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i don't know much about those i'm looking for a constant dc power supply though not something i have to wait to charge back up or anything just something thats always there.
It's not a good idea to work with high voltage if you don't know much about it, let alone work with 1 million volts.

A rule of thumb is 10,000 volts per 1 cm of spark. At 1 million volts you will get 1 meter long sparks shooting around.

Also, regardless what way you will generate high voltage, there will always be some capacitance involved. From basic physics, the energy stored in a capacitor is proportional to voltage squared. At 1 million volts, even a relatively small internal capacitance can unload a lethal charge.
 
  • #5
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Here is a rather simple way to produce a high voltage, but not 1 million volts.

1) Assemble a parallel plate capacitor in a tank with ultra pure water as dielectric.
2) Charge up the plate to a high voltage.
3) Drain out the water.

This produces a very high voltage by decreasing the dielectric constant of the charged capacitor by a factor of about 80.
 
  • #6
Wouldn't you be drawing a ridiculous amount of power to achieve this. I would think a steady 1 million volts ps would require more then an average wall output.
 
  • #7
i don't know but thats what i need to do check out my other one talking about superconductors and high voltage it talks about what i want to do down in a reply i left. i have an idea to change the world i'm going to build it but i need your guys help to get it done. i don't care what power it takes or what i have to do to do it im going to do it. if you have any ideas it would be greatly appreciated.
 
  • #8
dlgoff
Science Advisor
Gold Member
3,790
1,674
Not 1MV but they look neat. One clames to be 50KV at 5ma.
http://www.amazing1.com/hv-dc-power-supplies.htm" [Broken]
 
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  • #9
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5
I have an old (40 years?) Mark Ten B CD (capacitor discharge) igniton system that can generate roughly 30 kV from less than 1 amp at 12 volts. This circuit charges a capacitor to about 300 to 400 volts using a dc-dc converter, and dumps it into the primary of a 12-volt automotive ignition coil when an electronic switch is triggered. I get 2 cm sparks (2.5 on a good day) out of it. For spark voltages over 100 kV, I think a Tesla coil would be good choice. I had a high school classmate who built a small one (about 1 meter high) for a class project (with the teacher's help).
 
  • #10
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I seem to recall that air at STP can withstand about 30KV per centimeter. One million volts would require a smooth conducting ball of two foot diameter to be charged to 1MV without arcing to infinity.
 
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  • #11
berkeman
Mentor
56,649
6,551
I'm wanting to build a dc power source of 1 million volts more would be nice but ill start with a million and work my way up from there. Any suggestions would be helpufull. Is it possible to build a 1 million volt capacitor or should i build a capacitor bank to smooth out the ac current after its rectified or do you have a better suggestion for me. I'm wanting to build a coil gun with 1 million volts and not have to wait for capacitors to charge all the time just want to have a high voltage supply and fire it whenever. Any help will be greatly appreciated.
What'cha plannin' on shooting this coil gan at?
 
  • #12
i'm not planning on shooting any coil gun well maybe one or two just for fun. What i'm wanting to do with it though is i have an idea for a propulsion system using this. i talk about it in my other post of superconductors and high voltage
 
  • #13
Here is a rather simple way to produce a high voltage, but not 1 million volts.

1) Assemble a parallel plate capacitor in a tank with ultra pure water as dielectric.
2) Charge up the plate to a high voltage.
3) Drain out the water.

This produces a very high voltage by decreasing the dielectric constant of the charged capacitor by a factor of about 80.
Are you in essence storing the potential energy that the water had from gravity into additional energy per a charge as your dielectric changes from water to air?
 
  • #14
1,758
57
Go fly a kite in a thunderstorm.
 
  • #15
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1 million volts is way too much for a coil gun except maybe if that coil gun is as big as a house.
You only need a few thousand volts. You can build a power supply from a tv flyback transformer.
 
  • #16
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Put 250 of http://www.theneonstore.com/p-932-4k-ventex-12-vdc-neon-power-supply.aspx" [Broken] in series.
 
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  • #17
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0
Is there any way to increase the current of a Cockroft-Walton generator by adding tunnel diodes? I heard from someone years ago that a tunnel diode can increase current.
 
  • #18
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  • #19
I need the coils to have 1 million volts. I need a really powerful coil gun. But its not to shoot a projectile I want to but it on an aluminum ring with iron bolted to it in certain spots and make it spin as fast as I can. Will it eventually make it spin as fast as the magnetic field is generated. Thats why I want a steady supply and not something that you have to charge for one firing. I think a tesla coil might work can you wire that up to something. My idea is to use superconducting wire for the coils and some thick Mylar insulation. Go to superconductors.com and type 2 superconductors and check out the top one. Supposedly its superconducting at -40 degrees Fahrenheit. And put 1 million volts through those.
 
  • #20
RonL
Gold Member
1,096
215
I need the coils to have 1 million volts. I need a really powerful coil gun. But its not to shoot a projectile I want to but it on an aluminum ring with iron bolted to it in certain spots and make it spin as fast as I can. Will it eventually make it spin as fast as the magnetic field is generated. Thats why I want a steady supply and not something that you have to charge for one firing. I think a tesla coil might work can you wire that up to something. My idea is to use superconducting wire for the coils and some thick Mylar insulation. Go to superconductors.com and type 2 superconductors and check out the top one. Supposedly its superconducting at -40 degrees Fahrenheit. And put 1 million volts through those.
Don't know if this will help, but if you have a little time to look at the patents of a man that contributed so much in the early days, there is lots of mind stimulating drawings and wording in the body of his patents.

http://issuu.com/ericm814/docs/complete_patents_nikola_tesla
 
  • #21
521
70
So basically you want to build an electric motor that spins really fast.
Trust me, you don't need 1 million volts for that. You could even do it with just 12 V.
You don't need superconductors either.
What you need however are good bearings and the ring needs to be perfectly centered.
Why don't you just buy a motor and attach the ring to it?
 
  • #22
4,239
1
Alternatively, to generate 1MV, arrange to have 120 people in a large circle, on a dry day, each with a rubber comb.
 
  • #23
Well I need powerful electromagnets as powerful as i can get for my idea to work. I want the million volts I don't want to drop the power. I'm going to have 3 coils spinning the ring and 1 acting against that. And I need the force of the ring to overpower that one coil. maybe have to have another coil on so it passes through it. And exerts force on the electromagnet that is going against it as it goes through but if it does lower the speed of the other rings I need the other coils strong enough to spin it up to its top speed as fast as they can. Do you think its possible to get 1/4 of lightspeed out of this ring?
 
  • #24
RonL
Gold Member
1,096
215
Well I need powerful electromagnets as powerful as i can get for my idea to work. I want the million volts I don't want to drop the power. I'm going to have 3 coils spinning the ring and 1 acting against that. And I need the force of the ring to overpower that one coil. maybe have to have another coil on so it passes through it. And exerts force on the electromagnet that is going against it as it goes through but if it does lower the speed of the other rings I need the other coils strong enough to spin it up to its top speed as fast as they can. Do you think its possible to get 1/4 of lightspeed out of this ring?
I think you need to get a grasp of just how fast 1/4 lightspeed is. An electron will move about 3" in one nano second.(1 Billionth of a second)
Now go to a good source on spinning things, such as flywheels and motor armatures and study about how many RPM they can spin before flying to pieces (keep in mind that the hotter they get, the quicker they fly apart).

Just hope I didn't misunderstand your thoughts on whats spinning.:bugeye::smile:

Ron
 
  • #25
No I understand and i'm well aware of that hopefully the engine stays together. But its just going to be a metal ring thats spinning thats the only moving part period. It isn't like an engine where the pistons are reciprocating. A rotary engine only spins one direction and it can handle a lot of rpms but i'm only going to have one moving piece hopefully it works.
 

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