Building the Langmuir Probe

20 07 2011

All photos.

Today I began fabricating the Langmuir probe.

I am using a tungsten light bulb filament as the probe tip:

The rest is just ceramic tubing to hold it in place.  The filament is so thin and so fragile.

I use insulating varnish to hold it all together. I have to let this cure over night:

This will attach to the feedthrough:

The Langmuir probe will show the floating potential of the plasma… The dependent variable in the Sydney Experiment.

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3 responses

21 07 2011
Darcythomas

Won’t the nail Polish degas? And or get damaged by the hot plasma?

21 07 2011
Mark Suppes

Its insulating varnish. Yes, it may degas and yes it may get damaged by the plasma. I feel like I need to move forward with what I got. It can always be improved.

Its a moot point anyway because I broken the assembly this morning!

22 06 2012
Noor

i want to ask you about this probe when um trying to make a probe i faced a problem because tungsten is just one wire and i tight it with copper wire . How can i close the prob’s circuit with just one wire ??

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