Search found 437 matches

by Tyler Christensen
Sun Apr 01, 2012 3:40 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S. Construction
Replies: 50
Views: 17755

Re: F.I.C.S. Construction

<t>I have had cheap digital meters do exactly what you describe, and more expensive meters work great. I think it really just comes down to the quality of the meter. An analog is almost sure to work, though.<br/> <br/> I started using my scope as a volt meter which I really like, I will probably nev...
by Tyler Christensen
Tue Mar 20, 2012 7:20 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: CF vs KF flanges
Replies: 10
Views: 5231

Re: CF vs KF flanges

<t>My chamber was a combination of CF and KF. CF on the large hemisphere (pretty much the only option there, assuming you're going for the standard spherical chamber). I have one CF2.75 for the feedthrough since almost all surplus feedthroughs you find appropriate for fusors will be CF. I have KF on...
by Tyler Christensen
Sun Feb 19, 2012 9:20 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Power company Transformer
Replies: 2
Views: 2419

Re: Power company Transformer

<t>If the primary has a fully floating 24940 (not case-center-tapped) then yes, because you can put 120Vac on the "secondary" (now a primary) and rectify the 24940 winding, you'll get 35165Vdc_peak. If it is center tapped case grounded, then it's not so useful unless you put a multiplier on it (whic...
by Tyler Christensen
Tue Feb 14, 2012 5:27 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Simple GM probe construction, end-window tube
Replies: 12
Views: 5308

Re: Simple GM probe construction, end-window tube

I've run up to 1.8kV for my he3 supply through many BNC cables, several of very low quality, and have never once had an arc over issue. Maybe I'm just incredibly lucky, but I've always disregarded the suggested voltages that in my experience seem absurdly low.
by Tyler Christensen
Sun Feb 05, 2012 7:29 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Getting surplus parts from colleges.
Replies: 10
Views: 3891

Re: Getting surplus parts from colleges.

<t>It really depends where you are. Here at MIT I can basically get anything, everything is thrown away. There is no sales of old equipment, not worth the time. There are large electronics and lab dump sites that are accessible to students and we can take whatever we want day or night. On top of tha...
by Tyler Christensen
Mon Jan 16, 2012 2:42 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Please help with grid.
Replies: 3
Views: 2241

Re: Please help with grid.

Just a warning that I discovered through accident, anything made of a soft metal threaded on near the grid will permanently weld onto the threading. In my case that was aluminum. Copper would likely do alright, at least better than aluminum.
by Tyler Christensen
Sat Jan 14, 2012 12:23 am
Forum: Vacuum Technology (& FAQs)
Topic: Turbopump questions
Replies: 12
Views: 6620

Re: Turbopump questions

If it says that, it should be fine through vertical. All the turbo's I have worked with have been installed upside-down and haven't had troubles (of course it was confirmed with the manual that any orientation is acceptable before doing so)
by Tyler Christensen
Tue Jan 10, 2012 4:56 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Ion Steering Fins - Experimental Results
Replies: 6
Views: 2921

Ion Steering Fins - Experimental Results

<r>I was playing around in Poission Superfish and came up with a geometry that I thought should steer ions to avoid grid wires. Apparently this idea has come up before, also (Steven pointed me to this old discussions: <URL url="http://www.fusor.net/board/viewtopic.php?f=14&t=6580#p44586"><LINK_T...
by Tyler Christensen
Sun Dec 18, 2011 4:12 pm
Forum: Images du Jour
Topic: Archived - Plasma Created (also soft X-ray?) - Maarten van der Meer jr and Arnaud van Haaster
Replies: 4
Views: 2505

Re: Plasma Created (also soft X-ray?) - Maarten van der Meer jr and Arnaud van Haaster

<t>I don't think those are x-rays, they look like little discharges off of sharp parts of your grid and chamber, which happen a lot when conditioning a new grid at higher voltages.<br/> <br/> X-ray dots are different in two ways. One, they are distinct single pixel spots, sometimes maybe a few pixel...
by Tyler Christensen
Wed Dec 14, 2011 12:39 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Cleaning vacuum oil from a Glass Viewport
Replies: 6
Views: 3737

Re: Cleaning vacuum oil from a Glass Viewport

<t>You shouldn't use those because they are water based, and water is bad on vacuum equipment. You want to use a solvent such as acetone or ethanol. What usually works well is to get the bulk of the cleaning done with acetone, then finish off with ethanol which leaves no coating upon evaporation unl...