Search found 1458 matches

by Richard Hester
Wed May 13, 2015 7:01 am
Forum: Vacuum Technology (& FAQs)
Topic: TG-550 TC vac gauge tube
Replies: 9
Views: 2037

Re: TG-550 TC vac gauge tube

Here is a picture of a 1518-based gauge (too expensive by far), showing its scale - pretty good.
by Richard Hester
Wed May 13, 2015 6:35 am
Forum: Vacuum Technology (& FAQs)
Topic: TG-550 TC vac gauge tube
Replies: 9
Views: 2037

Re: TG-550 TC vac gauge tube

There was a discussion of fusor - applicable thermocouple gauge tubes way back in the early years of the forum (maybe even as far back as the first "songs" site). There are basically three thermocouple vacuum gauge tube types that are maximally useful for our efforts here in that they have extended ...
by Richard Hester
Tue May 12, 2015 3:36 am
Forum: Vacuum Technology (& FAQs)
Topic: TG-550 TC vac gauge tube
Replies: 9
Views: 2037

Re: TG-550 TC vac gauge tube

Unless this tube crosses to something as simple-minded as a Hastings DV-6, I wouldn't bother. The Anelva controller that interfaces to this tube looks pricey., and nothing is decipherable as to the actual range of the tube, as the controller/gauge uses an LED bargraph display. It may clone to someth...
by Richard Hester
Fri May 01, 2015 3:13 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gadolinium Loaded Scintiilaors for Neutron Detection
Replies: 26
Views: 5877

Re: Gadolinium Loaded Scintiilaors for Neutron Detection

There's been a fair number of nibbles for neutron detectors in the intervening years, mostly in the realm of scintillators. Boron Nitride and Boron Carbide both might be useful as thermal neutron scintillators. Polyethylene Naphthalate (PEN) is useful as a basic plastic requiring no wavelength shift...
by Richard Hester
Thu Apr 30, 2015 4:00 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gadolinium Loaded Scintiilaors for Neutron Detection
Replies: 26
Views: 5877

Re: Gadolinium Loaded Scintiilaors for Neutron Detection

I am "guest" - I don't know why the forum stripped the name from some previous posts of mine and not others. As usual, things like this are presented as "items of interest" rather than a be-all and end-all. I was actually interested in something like this a few years ago, especially a Gd-loaded sili...
by Richard Hester
Tue Mar 17, 2015 5:57 am
Forum: Images du Jour
Topic: My Vacuum System Progress
Replies: 8
Views: 1933

Re: My Vacuum System Progress

If you're using silicone pump oil, you don't want the cooling water to be too cold, at it impedes the flow of condensed oil on the walls getting back to the bottom of the pump - more crucial for DC-705, perhaps less so for 704. A radiator and fan might be a better option.
by Richard Hester
Sun Jan 11, 2015 2:31 am
Forum: Interesting Links
Topic: New tabletop particle accelerator
Replies: 6
Views: 2493

Re: New tabletop particle accelerator

Here's the reference to vacuum breakdown and other experiments contemplated for ultrashort pulse high-intensity lasers. Vacuum breakdown was mentioned as far back as the early 70's - laser technology is finally getting to the point where it's capable - a matter of finesse rather than brute power/ene...
by Richard Hester
Sat Jan 03, 2015 12:40 am
Forum: Interesting Links
Topic: New tabletop particle accelerator
Replies: 6
Views: 2493

Re: New tabletop particle accelerator

The petawatt lasers are extremely small compared to the monster in Livermore - their high wattage is derived from extremely short pulse width (femtoseconds), generated by a big table full of expensive optics using frequency chirp/pulse compression techniques. The Ti-sapphire laser that drives the me...
by Richard Hester
Sat Jan 03, 2015 12:27 am
Forum: Vacuum Technology (& FAQs)
Topic: Kurt J. Lesker 275i series - Seems like a great buy!
Replies: 9
Views: 1878

Re: Kurt J. Lesker 275i series - Seems like a great buy!

D-shell connectors don't work for the classic Convectron gauge - they use some sort of &**### proprietary connector (G-P uses the same/similar connector for their ion gauges.. The Mini-Convectrons may be another matter, however. I have both around the house, though I can more readily lay my hands on...
by Richard Hester
Fri Jan 02, 2015 5:30 am
Forum: Vacuum Technology (& FAQs)
Topic: Kurt J. Lesker 275i series - Seems like a great buy!
Replies: 9
Views: 1878

Re: Kurt J. Lesker 275i series - Seems like a great buy!

Convectron gauges and controllers are cheap enough on E-pay - it's the cables that'll get you, though I suppose I could improvise using some multi-conductor wire and individual female contacts w/heatshrink.