Search found 14 matches

by bthoma
Sun Jul 01, 2012 6:52 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Camera hints?
Replies: 9
Views: 3540

Re: Camera hints?

Use a mirror. I roasted my first camera shooting directly through a window into the chamber.
by bthoma
Sat Sep 03, 2011 5:07 pm
Forum: Fusion --- Past, Present, and Future
Topic: Taylor Wilson in the news again
Replies: 4
Views: 3064

Re: Taylor Wilson in the news again

<t>I agree with David. There are many people who go through life without using anything more than just the brain stem. My experience is that when on the topic of nuclear physics/theory I see that deer in the headlights look. The sad part is I see it all the time from college graduates. There are leg...
by bthoma
Sun Aug 07, 2011 9:57 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Grid size
Replies: 9
Views: 2282

Grid size

<t>I have a rather large fusor made from a 10" x 8" cross. Basically, it is a cylindrical chamber. I have been using a spherical grid made from tungsten. The grid I did first fusion on was about 1" and dwarfed by the chamber. Considering the size of a nuclei, a long distance, nonetheless. Advice fro...
by bthoma
Sun Aug 07, 2011 9:45 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV Feedthrough
Replies: 2
Views: 1607

HV Feedthrough

<t>So far, I have roasted one feedthrough which led me to purchase a good 70kV rated one. I have sputtered the inside of the good feedthrough insulator with stainless steel doing multiple neutron production runs. I needed to clean it. I took a gamble and bought some 600 grit aluminum oxide powder an...
by bthoma
Fri Jul 15, 2011 12:28 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Any Interest in BTI Group Buy?
Replies: 8
Views: 2673

Re: Any Interest in BTI Group Buy?

I could use one.
by bthoma
Mon Jul 11, 2011 1:00 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusion Run this weekend...
Replies: 4
Views: 1883

Fusion Run this weekend...

<t> I have finally found enough time away from work to get the fusor up and running. Preliminary results are posted below as well as pictures. I would like to confirm with a BTI detector, as soon as I can get one.<br/> The chamber has been sitting under vacuum since the HV feedthrough was replaced l...
by bthoma
Wed Apr 13, 2011 10:14 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Feedthrough Failure
Replies: 14
Views: 4617

Re: Feedthrough Failure

<t>Thanks Carl. I think the turbo is OK, though I may need to change out the bearings. It fired up and ran at 48K RPM with no chatter afterwards. I am just going to bit the bullet and get a feedthrough rated at 70KV. I really want to pursue automating the process. I figure isolating the instruments ...
by bthoma
Wed Apr 13, 2011 9:56 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Feedthrough Failure
Replies: 14
Views: 4617

Re: Feedthrough Failure

<t>This photo was taken after the failure. The grid had a new alumina sleeve around it, and the "glow" seen in the insulator is just ambient light from a ceiling fixture above the chamber. The chamber was filled with a 10 micron stew of air and helium. I was trying to insulate the sleeve with a thic...
by bthoma
Wed Apr 13, 2011 12:53 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Feedthrough Failure
Replies: 14
Views: 4617

Feedthrough Failure

<t>Here’s why it is good design practice to size all the items based on the power supply capability. I have a 30-40KV feedthrough. I have a 75KV power supply. I put a PLC control on my rig to control the power and turbo. Inputs are an ION gauge, vacuum transmitter, and convectron gauge. During a cle...
by bthoma
Sun Jan 09, 2011 2:57 pm
Forum: Images du Jour
Topic: Acrhived - Vacuum and Voltage
Replies: 7
Views: 3786

Re: Vacuum and Voltage

<t>John:<br/> That's the beauty of doing this project. I am building this in my shop at work, but all you see is stuff that required rebuild or refurb (except the roughing pump and the 30kV Supply - I got such a good deal on those I couldn't pass on it). I know we would all like to figure out how to...