80kV needed..anyone?

[FadeToBlackened]

Not sure exactly where this would go, but since electronic is mentioned in this forum's description...

From <a href="http://www.powerlabs.org," target="_blank">www.powerlabs.org,</a> in regard to plasma globes:
</font><blockquote><font size="1" face="Verdana, Arial, Helvetica">quote:</font><hr /><font size="2" face="Verdana, Arial, Helvetica"> Fortunately, none of this is a problem unless you are working with VERY high vacuums (tens of milliTorrs or so) and feeding your globe more than 25Kilovolts, and you will know these rays are being emitted, as the glass glows green in the strike point (this happened to a normal light bulb I had, but that was at 80kV, not exactly your "average" plasma globe:) </font><hr /></blockquote><font size="2" face="Verdana, Arial, Helvetica">Yes, I want xrays. Anyone (I'm looking in your direction PYRO500 <img border="0" title="" alt="[Wink]" src="wink.gif" /> ) know a reasonably priced way to get said 80kV?

[xyz]

My coil driver puts out between 50-70kv and was very easy to make, it puts out pulses though and not a steady current flow (not sure if you need a steady flow in a plasma globe)

<a href="http://www.roguesci.org/cgi-bin/ewforum/ultimatebb.cgi?ubb=get_topic;f=4;t=000391" target="_blank">It is under this topic</a>

<small>[ October 18, 2002, 08:47 PM: Message edited by: xyz ]</small>

[PYRO500]

For a plasma globe you really need high frequency AC so I can think of two solutions for you one would be to use a tesla coil to power it but that takes alot more time and isn't worth it just for a plasma globe, the other is to go with an ignition coil driver. I'm not sure what the lamp dimmer/120V ones do but if you can get it to arc about 8.8 cm from points then you should have 80 KV.

[MnkyBoy]

Most ignition coils will put out a max of ~35 kV. That kind of juice is obtainable with a series of Marx Bank. (A series of caps that charge up in parallel, then get switched in series at time of discharge. Charge the caps at 20 kV, 20 kV X 4=80 kV).

Here is a link to Marx Bank at work Stats (http://www.cs.sandia.gov/ilab/apps/energy/zmachine.htm)

http://www.cs.sandia.gov/ilab/apps/energy/Z.gif

[Mr Cool]

I'd use an oscillator/amplifier (or isolated mains 240/120V) to drive a transformer, to get a modest 8-10kV, then a cockroft-walton multiplier of 8-10 stages to give you in the 80kV range, DC. Or if you want high power pulses use your 10kV to charge a Marx bank through a bridge rectifier. Just remember that the components in your multiplier/marx must be rated for 30% (safety margin) extra than the peak voltage that your transformer gives out, not the average voltage. And components in this voltage range can be expensive. Check eBay for them, you can get very good deals.

[Tuatara]

For 80kV DC, I'd start with a 15kV neon transformer. Peak voltage is about 22kV so you would only need a four stage multipier. Use EHT diodes eg BY84xx series or stacks of 1n4007s (cos theyre cheap). Caps you can build yourself using Al foil and polythene sheet.

Pulsed 80kV is easiest with a marx bank.

[Zerstoren Sie]

Here's a link that should answer all of your questions :

http://www.kronjaeger.com/hv/index.html#xray

You may have to look at the older version of his site to get the X-ray info. But, this all should be enough to do what you need. If not, check both the tesla coil and the high voltage webrings.

[Ghostcustom 24]

More HV links
http://www.geocities.com/CapeCanaveral/Lab/5322/links.htm

Some HV equip suppliers (try looking at their products)
http://home.earthlink.net/~jimlux/hv/supplier.htm