Search found 262 matches

by George Schmermund
Fri Jul 29, 2016 6:33 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Hot Filaments And Ion Sources
Replies: 0
Views: 1239

Hot Filaments And Ion Sources

A fellow named Trevor Robson was an early attendee at the Vacuum Tube Workshop. He got pretty caught up in the hobby of building vacuum tubes and has been building his own tube lab at home. Along with this he has started a forum dedicated to gathering and sharing tips and techniques related to build...
by George Schmermund
Fri Apr 03, 2015 7:02 pm
Forum: Images du Jour
Topic: IEC Fusion - Neutron Club Entry
Replies: 36
Views: 11707

Re: IEC Fusion - Neutron Club Entry

It's not unusual for information that is not directly on the well beaten path here to be ignored. High sensitivity neutron detection has previously been reported sometime back (http://www.fusor.net/board/viewtopic.php?f=13&t=6245), but was ostensibly dissed by a resident oracle and the detector fell...
by George Schmermund
Thu Nov 20, 2014 11:47 pm
Forum: Vacuum Technology (& FAQs)
Topic: Hot Ion gauge filament repair
Replies: 19
Views: 5002

Re: Hot Ion gauge filament repair

Thoriated tungsten wire suitable for making filaments is readily available on eBay. The high emission characteristics of thorium are not really available in this wire unless the partial pressure of residual water vapor is considerably less than 10^-10 Torr. Most all of what's left in a properly clea...
by George Schmermund
Mon Nov 03, 2014 1:04 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Re Vacuum Tube Workshop
Replies: 1
Views: 1879

Re Vacuum Tube Workshop

Carl - Thanks for the positive comments! I've shifted this thread over to here so that we don't get scolded for having a discussion in the trading post forum. The Museum is exceedingly UNequipped for this project, but their spirits are high. The website images are of one of the labs I have at home. ...
by George Schmermund
Fri Oct 17, 2014 1:41 am
Forum: Vacuum Technology (& FAQs)
Topic: Disk Jet DP Reloaded
Replies: 4
Views: 1301

Disk Jet DP Reloaded

Well, the last attempt to present a coherent discussion about a DP design went south pretty quickly. I suppose that I'm partly responsible for it's race to the bottom. I shouldn't encourage group lunacy by responding to and amplifying absurdities. But after a few beers it's hard not to have some fun...
by George Schmermund
Wed Oct 15, 2014 11:47 pm
Forum: Vacuum Technology (& FAQs)
Topic: Disk Jet Diffusion Pump
Replies: 19
Views: 4753

Re: Disk Jet Diffusion Pump

I guess I'd have to say that I'm in accord with the posters here that make claims that a diffusion pump is easy to design and build. Their suggestions that a working pump can be constructed and preform well with only the proper assembly of such things as spray guns, car mufflers, stove pipes, invert...
by George Schmermund
Wed Oct 15, 2014 1:56 am
Forum: Vacuum Technology (& FAQs)
Topic: Disk Jet Diffusion Pump
Replies: 19
Views: 4753

Re: Disk Jet Diffusion Pump

What a novel concept, an upside down tree as a diffusion pump! Yes, you are correct that moisture retained in the roots would be an issue at start up.
by George Schmermund
Sun Oct 05, 2014 11:09 pm
Forum: Interesting Links
Topic: Convert a NST into a 50 kV power supply
Replies: 1
Views: 1763

Re: Convert a NST into a 50 kV power supply

Richard has already passed judgment on this video.

viewtopic.php?f=11&t=9245
by George Schmermund
Sun Sep 21, 2014 10:26 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: X-Ray Florescence With Am 241
Replies: 4
Views: 2009

Re: X-Ray Florescence With Am 241

David - I did a quick test with a piece of solder to see what the K and L series lines for lead and tin would look like with the current setup. The two L alpha and beta lines for Pb show up well along with the L lines of the Sn. Due to the low resolution of the detector, the lower energy Sn lines ar...