Electronics > Projects, Designs, and Technical Stuff

50Ohm water cooled coaxial cable and connectors?

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Plasmateur:

--- Quote from: T3sl4co1l on October 13, 2019, 05:44:24 am ---It's rated for 80kW and 200°C, what's your problem?! :-DD

Tim

--- End quote ---

There's no problem on that front, although it can easily get hotter than 200°C on the surface of the glass containing the plasma and the coil producing the plasma if water isn't run through it.

The problem is finding a nice aesthetically appealing and easy to connect solution.

coppercone2:
the idea of hard line that is flow cooled and moving dielectric around the conductor is interesting

DaJMasta:
But probably extremely hard to execute, any residual oil, magnet/shaft wear from a pump, or other impurities would change the dielectric and resistive properties of the insulator of the cable.... it would be a nightmare to keep consistent.



I presume it would have to exists if the cables exist - I assume the water wouldn't cool that effectively unless the terminated end was part of the loop, so unless the water channel actually is split for out and back and it's terminated before the bulkhead, they would have to be out there somewhere.

Maybe a place to start is contacting the manufacturer of such a coax cable?  I'm sure they'd be happy to point you to their own parts if they have a commercially available stock, and maybe that can give you a physical feature to look for in other connectors or a baseline to have one machined yourself.  Maybe there's even a water cooled coax that just has the water in a jacket, so that you can use a standard connector and then the water line goes to a separate connection straight out of the jacket.

coppercone2:
particulate filters and teflon mag drives would help but it is a nasty problem

MagicSmoker:

--- Quote from: Plasmateur on October 13, 2019, 06:25:09 pm ---There's no problem on that front, although it can easily get hotter than 200°C on the surface of the glass containing the plasma and the coil producing the plasma if water isn't run through it.

The problem is finding a nice aesthetically appealing and easy to connect solution.

--- End quote ---

Interesting problem you have there. This sounds an awful lot like a vacuum sputtering system and if so, I wonder if you couldn't inductively couple RF to the chamber, neatly sidestepping issues with cables heating as a byproduct of plasma generation.

Sometimes the best solution is an orthogonal one... but sometimes brute force is, indeed, the only option. If the latter is all that is left then look for coax/hardline with teflon dielectric. It is also possible to pressurize some types of hardline with a custom gas fill like helium or SF6 for both better thermal conductivity and higher dielectric strength.

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