Search found 738 matches

by Jerry Biehler
Thu Jan 21, 2021 1:34 pm
Forum: Items For Sale
Topic: Nice vacuum gear from UW Seattle.
Replies: 2
Views: 174

Re: Nice vacuum gear from UW Seattle.

That's a very similar setup to what I have at home. I had a Leybold D30 pump with the smallest Ruvac roots blower. For my large chambers they help get them down to turbo pressure quickly, I can't remember where you kick in the roots, this one does not have a high pressure bypass. I did add a VFD so ...
by Jerry Biehler
Mon Jan 18, 2021 6:21 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Low Cost Spectrometer and Plasma Spectroscopy
Replies: 2
Views: 251

Re: Low Cost Spectrometer and Plasma Spectroscopy

I have an assortment of different spectrometers. I do have one of the ocean optics ones that connects to a PCI card, another little serial based one acton spectrapro 150 and the big one I just got working again, a Optronic Laboratories 740A/D that I just got running https://hackaday.io/project/17598...
by Jerry Biehler
Sat Sep 12, 2020 10:31 am
Forum: Items For Sale
Topic: Philips High Tension Generator 100Kv
Replies: 7
Views: 993

Re: Philips High Tension Generator 100Kv

The amount of emission current in a TEM or SEM is tiny. We are talking picoamps. So these power supplies are kind of useless for anything outside of what they were intended for.
by Jerry Biehler
Tue Sep 01, 2020 11:28 pm
Forum: Vacuum Technology (& FAQs)
Topic: Foreline KF O-ring greasing
Replies: 4
Views: 776

Re: Foreline KF O-ring greasing

If you are seeing that slow of a leak that levels out you probably has something outgassing in your foreline.
by Jerry Biehler
Tue Jul 28, 2020 3:50 am
Forum: Vacuum Technology (& FAQs)
Topic: Help Finding Documentation
Replies: 5
Views: 1470

Re: Help Finding Documentation

Yup, thats an ion pump. Probably came off a field emission SEM. Good for getting down to really low which the field emission emitter needs to live happily. Unless you plan on building a UHV system I would probably sell the pump itself on ebay. JEOL probably wont give you the time of day and they gen...
by Jerry Biehler
Sun Jul 26, 2020 11:40 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Australian Breakthrough Fusion (Duh, Chirp Lasers)
Replies: 12
Views: 2326

Re: Australian Breakthrough Fusion (Duh, Chirp Lasers)

Tripling YAG gets you 355nm, 266 for quadruple. But the losses go up every time you go up a harmonic where we were pushing 8W of green to get 2W of 266.
by Jerry Biehler
Mon Jun 22, 2020 9:52 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Transformer Input Meanings
Replies: 6
Views: 1286

Re: Transformer Input Meanings

P1 , P2, or P3 are your primary connections. SHLD is shield, the shield on the cable supplying the power to the primary. If there is a shield it might be a high frequency drive transformer which you will need to either get or build a drive for it. With the physical size of both being so small I woul...
by Jerry Biehler
Sun Jun 21, 2020 8:27 pm
Forum: Announcements and Site Administration Topics
Topic: Space X conversation Xfer
Replies: 4
Views: 1235

Re: Space X conversation Xfer

There is an array of switches below the touch screen for critical functions. But both screens can do the same functions so even if one screen died you still have the other. So first earth would have to lose control of the capsule, then both screens need to die. At that point so many things have gone...
by Jerry Biehler
Tue Jun 02, 2020 8:05 am
Forum: Vacuum Technology (& FAQs)
Topic: Old oil for the turbo
Replies: 5
Views: 1777

Re: Old oil for the turbo

It depends, how much is worth risking the bearing in your pump. You can get off-brand versions of the same oil, I would rather do that than risk expensive bearings.
by Jerry Biehler
Sat May 23, 2020 5:37 pm
Forum: Vacuum Technology (& FAQs)
Topic: Foreline valve and trap - what is neccesary?
Replies: 13
Views: 2540

Re: Foreline valve and trap - what is neccesary?

Not a strange mix, thats just your average valve, air operated. They use a solenoid to supply air pressure to a piston which either opens or closes the valve. Technically you could convert one to manual but it is more trouble than it is worth. And those are generic valves. These are true pump isolat...