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2 psi is about 100 torr (100000 microns/mili torr). Any 2 stage oil mechanical pump will easily go to 1 torr. (I'm not sure about dry diaphragm pumps). At 1 torr you can use whatever materials you want, plastcs, epoxy, etc... Below 100 mili Torr things get tricky.
I'm not sure how you come up with the 2 torr figure, why do you need a vacuum and not plain room pressure?
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
I'm not sure how you come up with the 2 torr figure, why do you need a vacuum and not plain room pressure?
The electric field will accelerate the charge particles, say at 20kv to 83,876,580m/sec, but with the collisions at 1 atmosphere it drops down to 5032.5um/sec between collisions,kinetic energy of 0.000071eV, I need 15keV. If i could build 800kv power supply and the arc reach 0.5M degrees it should work, I think...
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Daedronus wrote ...
You would want a 100% oil free system if you make microprocessors or something, not common things.
I used to work for one of the leading suppliers of 'systems that make microprocessors' and, while we did supply oil free pumps sometimes, the vast majority of systems we supplied used backing pumps with oil in, although they did (without exception, I think) use a type of special 'Fomblin' oil.
Back to the pump question, I would recommend a dual stage oil mechanical pump.
Newer and cleaner the better, but any should not have any problems to exceed the 2 psi requirement, in fact they should have no problem to get below 200 - 300 miliTorr. If you get one used make sure to replace the oil with the proper kind.
Use any kind of 2 parts metal filled epoxy to make seals, but don't use silicone, the kind that out gasses acetic acid while curing. In fact don't use any kind of solvent or single part cure adhesive, because they tend to cure forever, outgs junk and they can contaminate the oil in the pump.
I would recommend to use a proper bellow connection to the pump, not a plastic hose. They are quite cheap:
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
Working on a new area, A MHD thruster for a rocket. Being looking over the forum for can crushers, will try it with 10 microwave caps in parrellel for the coil and 10 in series for the spark gap, only collected 5. Running the nst looks like the prinpcile works :), just getting the amps will be the tricky part.
If any one reads this, what would be the effect of 10uF at 1kv for a can crusher, and would 15kv 100nF work as one. Getting the coil and spark to fire as one might be a problem
Just a test, will try with some more amps, F=I*Length*B, Increase the length of the arc and more current should make more of a jet outwards
This is useing a MOT, with a voltage doubler, I need more caps.... The MOT is running 240volt 2.5amps, this is the volatge doubler, going to need to put a switch to stop power flowing into the caps just before firing.
From the first post having wire charged and in a circle pattern makes it spin, adding some magnetic to add to the effect. Will try with the caps and see how much amps min needed to make the arc get close to 90 degrees
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Joined: Fri Dec 16 2011, 03:15AM
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Posts: 874
The ordering of CCTO didn't go through in the amount I wanted, but found this site , the Barium Titanate is $222 for 5kg, which I'm hoping to build 14*2 caps for a voltage multiplier running the NST.
Below is a experiment into a fuser which I plan to run from the CW, and the vacuum pump from the 5 above post.
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