Search found 142 matches

by Liam David
Thu Jun 11, 2015 10:41 am
Forum: Images du Jour
Topic: Liam David Fusor Update
Replies: 42
Views: 16344

Re: Liam David Fusor Update

Yeah, it's not the right fitting. I used it earlier by brazing a washer to the end to act as a rudimentary seal surface along with a cast solder gasket. It undoubtedly leaked and I'm replacing it with a VCR to KF adapter soon. It's just in the picture for "show". Do I need silver plated SS gaskets o...
by Liam David
Thu Jun 11, 2015 1:15 am
Forum: Images du Jour
Topic: Liam David Fusor Update
Replies: 42
Views: 16344

Re: Liam David Fusor Update

At the moment, I am unable to deadhead the gauge. I got my new chamber in the mail today- it's a 6 way 2.75" conflat cross. Here is it assembled with used copper gaskets just for reference. http://i1186.photobucket.com/albums/z368/thedavidzoo/06101520571_zpsbsffop7s.jpg http://i1186.photobucket.com/...
by Liam David
Sat Jun 06, 2015 1:31 am
Forum: Images du Jour
Topic: Liam David Fusor Update
Replies: 42
Views: 16344

Re: Liam David Fusor Update

It's been a while since I last posted. I have bought a 6 way 2.75" conflat cross to serve as a new main chamber. It will get here next week. Also, when I'm roughing the chamber out, the pressure drops to ~55 mtorr (still leaks) and then starts to slowly rise to 56 and then 57 as the pump starts to w...
by Liam David
Wed Apr 15, 2015 4:24 pm
Forum: Images du Jour
Topic: Liam David Fusor Update
Replies: 42
Views: 16344

Re: Liam David Fusor Update

I discovered that one of the gas ball valves I use leaks, so I immediately suspected all of them. I bought a new vacuum butterfly valve for dirt cheap and replaced the ball valve. Now I can vent the mechanical pump and keep the chamber under vacuum. It leaks at about 0.5mTorr/s, and rises to 13 torr...
by Liam David
Tue Mar 03, 2015 12:50 am
Forum: Images du Jour
Topic: Liam David Fusor Update
Replies: 42
Views: 16344

Re: Liam David Fusor Update

After re-brazing a conflat to KF adapter and replacing part of my vacuum line with copper pipe, I got my chamber down to 35mTorr after 45 minutes of pumping(not great, but an improvement over 400mTorr). The pressure rises at about 1mTorr/sec when I close the valve. I cranked up the voltage and got a...
by Liam David
Mon Feb 23, 2015 1:35 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 60 kV feedthrough design?
Replies: 9
Views: 6191

Re: 60 kV feedthrough design?

Andrew Seltzman built a fluorinert cooled grid for his fusor.
http://www.rtftechnologies.org/physics/ ... d-grid.htm
by Liam David
Wed Feb 11, 2015 8:46 pm
Forum: Images du Jour
Topic: Liam David Fusor Update
Replies: 42
Views: 16344

Re: Liam David Fusor Update

Finally I bought a Granville Phillips Series 275 Convectron Gauge with digital display (part # 275538-GQ-T). I powered it up and is displays around 750 torr when in the correct horizontal orientation.The gauge has a 1/4" female VCR connection, and I do not want to buy some outrageously priced VCR to...
by Liam David
Sun Jan 11, 2015 3:24 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: New HF Driver Idea
Replies: 37
Views: 18636

Re: New HF Driver Idea

I hooked up a variac to the primary and turned the voltage to 5V at 7.3A. The output voltage was over 400V, compared to using a 15V 60mA power supply and getting 70V (because the output of flyback style transformers depend on the input current???). Over ~10V, the current was too much for my multimet...
by Liam David
Sat Jan 10, 2015 6:58 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: New HF Driver Idea
Replies: 37
Views: 18636

Re: New HF Driver Idea

I attached the 15V to the thick wires with the crimped-on bolt connectors. This primary has a resistance of 0.02 ohms. The springs, or the secondary, have a resistance of 110.6 ohms and this is where I got 70V AC out. From the outside, the core has inconsistent continuity, sometimes masking contact ...
by Liam David
Sat Jan 10, 2015 3:52 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: New HF Driver Idea
Replies: 37
Views: 18636

Re: New HF Driver Idea

I put 15V AC(60Hz) into the large wires that I thought were the secondary and got 70V out on the two springs. This seems way to low of a turn ratio to output multiple tens of kV at 60Hz in, so it must be a HF transformer.??? http://i1186.photobucket.com/albums/z368/thedavidzoo/2014-11-07_20-24-44_32...