Search found 454 matches

by Wilfried Heil
Mon May 03, 2010 11:03 pm
Forum: Vacuum Technology (& FAQs)
Topic: Strange Feedthrough Flange
Replies: 9
Views: 4065

Re: Strange Feedthrough Flange

<t>Sure, 1/2" steel should be enough to squeeze down a viton gasket without bending. The flange that you have looks a bit thicker, like 3/4", so you just might make the other part with a similar thickness.<br/> <br/> I have this same feedthrough with a CF flange, running at up to 50 kV with no probl...
by Wilfried Heil
Mon May 03, 2010 9:24 pm
Forum: Vacuum Technology (& FAQs)
Topic: Strange Feedthrough Flange
Replies: 9
Views: 4065

Re: Strange Feedthrough Flange

The smallest ASA parts which I find now have an OD of 4.25" and various IDs from 0.50" up. You may have to make your own adapter flange, which should not be difficult to do.
by Wilfried Heil
Mon May 03, 2010 8:14 pm
Forum: Vacuum Technology (& FAQs)
Topic: Strange Feedthrough Flange
Replies: 9
Views: 4065

Re: Strange Feedthrough Flange

That's a 3.00" OD ASA flange, from the steampipe era. One flange has a groove for an o-ring, like your connector, and the counterpart is just a flat plate.
http://www.edwards.co.il/catalog/13/130107.pdf
by Wilfried Heil
Mon Apr 19, 2010 3:18 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: New Power Supply
Replies: 5
Views: 2772

Re: New Power Supply

<r>I have a Glassman supply on which I had to reverse the polarity, which was not difficult to do.<br/> Maybe this helps. The manual is available in the "Files" section of this forum.<br/> <br/> <URL url="http://www.fusor.net/board/viewtopic.php?f=11&t=4622#p27460"><LINK_TEXT text="viewtopic.php...
by Wilfried Heil
Thu Mar 04, 2010 1:55 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: NIM Shaping Amplifier Issue
Replies: 10
Views: 4623

Re: NIM Shaping Amplifier Issue

<t>You can use aluminum electrolytic caps for power supply bypassing, but you will need 10-20x higher capacitance for the same HF filtering effect as the tantalum caps.<br/> <br/> I would replace all the old caps with new tantalum caps of the same or slightly higher value.<br/> <br/> Wet electrolyti...
by Wilfried Heil
Fri Feb 26, 2010 12:45 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Convienient Deuturium Storage & Purification, ? Semi-Sealed Fusor
Replies: 4
Views: 2025

Re: Convenient Deuterium Storage & Purification, ? Semi-Sealed Fusor

<r>You can get small metal hydride storage tanks with a nickel-vanadium alloy, for about the price of an empty lecture bottle. I am using one of these at the moment.<br/> <br/> <URL url="http://www.fusor.net/board/viewtopic.php?f=6&t=2592#p12102"><LINK_TEXT text="viewtopic.php?f=6&t=2592#p12...
by Wilfried Heil
Sat Jan 30, 2010 11:30 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: OTC Ion Source Driver / Med-High Power RF Power Supply
Replies: 3
Views: 4045

Re: OTC Ion Source Driver / Med-High Power RF Power Supply

<r>No need to break anything. Just take the ferrite core apart, which comes in two pieces. The tube is manufactured first and then the ferrite ring is mounted around it. Drive frequency will be in one of the ISM bands, typically 250 kHz for the "low frequency" ones. You get both the RF driver circui...
by Wilfried Heil
Wed Jan 27, 2010 6:58 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Berkeley / Leung Fusor -vs- NSD Fusor
Replies: 4
Views: 2374

Re: Berkeley / Leung Fusor -vs- NSD Fusor

<r>Ka-Ngo Leung is working at LBNL / UC Berkeley, CA (not Berkley, Alabama...).<br/> <br/> <URL url="http://www.nuc.berkeley.edu/People/Ka-Ngo_Leung">http://www.nuc.berkeley.edu/People/Ka-Ngo_Leung</URL><br/> <br/> His compact neutron generators are interesting. Besides the small size, the main impr...
by Wilfried Heil
Thu Dec 10, 2009 11:57 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Reversing High Voltage Polarity
Replies: 11
Views: 6572

Re: Reversing High Voltage Polarity

The "DC Limit" is marked 0..10, which probably means 0..100% and not mA.
You can load the output and then see at which current it trips.
by Wilfried Heil
Wed Dec 09, 2009 4:28 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Reversing High Voltage Polarity
Replies: 11
Views: 6572

Re: Reversing High Voltage Polarity

<t>The red sticks next to the transformer are very likely selenium rectifier stacks in a full bridge configuration. The black kludge above them is a more recent silicon rectifier which replaces some or all of them. The orange parts in a Plexiglas cage on the right will be a smoothing capacitor for t...