## Langmuir Probe

12 07 2010

Most of the parts for the Langmuir probe are here.

The probe will connect via the rear 8″ conflat:

Unfortunately, this 8″ conflat holds the chamber up! So I whipped up an 80/20 solution:

You can see the chamber is supported on either side by 80/20:

Stuart has the long socket wrench we’ll need:

We have ceramic tubes left over from the fusor grid. However, they don’t quit fit together.  I’ll have to file the smaller one with a diamond file. Easy.

An open question:

Finally… I still need to purchase the super thin tungsten wire that will form the tip of the Langmuir probe. Anyone have a foot or so of thin tungsten wire?

### 8 responses

13 07 2010

For thin tungsten wire, how about using the filament from a 500-watt halogen lamp? I am thinking of the tubular lamps which are sold for use on building sites etc.

13 07 2010

That thought crossed my mind as well.

13 07 2010

No help here; but the mathematics of Langmuir probe is interesting. Do you have a mathematical development for the none Boltzmann distribution of the polywell chamber? When you get it hooked up, I have no idea how; are you going to make the data available?
Ray

13 07 2010

I’m not sure if it’s possible, but you could try wire wrapping the tungsten around the electrode

14 07 2010

or use the filament of a normal light bulb. they have long thin tungsten wires

14 07 2010

Nah, just buy the stuff directly.

http://www.sigmaaldrich.com/catalog/ProductDetail.do?D7=0&N5=SEARCH_CONCAT_PNO|BRAND_KEY&N4=267554|ALDRICH&N25=0&QS=ON&F=SPEC

14 07 2010

let’s try that again.

http://tinyurl.com/2exlzet

15 09 2010

How thin is thin? TIG welding electrode?