Search found 142 matches

by Liam David
Sat Jul 06, 2019 4:33 pm
Forum: Images du Jour
Topic: I'm back, and fusing
Replies: 5
Views: 4380

I'm back, and fusing

It's been a few years since I posted in these forums, though recent progress on my fusor and a free summer have demanded I return. I have likely been grouped with the scores of youngsters who arrive here excited but fade away having failed to achieve fusion or lost interest. I want to remove myself ...
by Liam David
Wed Jan 04, 2017 1:44 am
Forum: Images du Jour
Topic: First Fusion for Liam David - Neutron Club Application
Replies: 14
Views: 6477

Re: First Fusion for Liam David - Neutron Club Application

I have a 2.75" butterfly valve between the turbo and chamber and I always throttle the pump before introducing deuterium. It does wonders for gas usage. Dennis, what is the Cv for the needle valve you're using? I use one with a 0.05Cv (I think the rating is for water, but I'm not too sure), which wo...
by Liam David
Tue Dec 27, 2016 5:05 am
Forum: Images du Jour
Topic: First Fusion for Liam David - Neutron Club Application
Replies: 14
Views: 6477

Re: First Fusion for Liam David - Neutron Club Application

I have the Spellman supply, chamber, and cart all grounded to a central port and then a grounding rod stuck eight feet in the dirt outside. Based on some more testing I did today, I believe that the counts I received yesterday were electrical noise. I will have to do a lot more testing and improve t...
by Liam David
Mon Dec 26, 2016 10:33 pm
Forum: Images du Jour
Topic: First Fusion for Liam David - Neutron Club Application
Replies: 14
Views: 6477

Re: First Fusion for Liam David - Neutron Club Application

I did not have a ballast resistor in the first runs, but I will use a 60k resistor in my next attempt. Kinda sorta forgot it.... I am almost done with a mains frequency 50kV x-ray supply which will allow me to push the fusor to the limits without having an electronic unit shut off on me, so I'll pro...
by Liam David
Mon Dec 26, 2016 12:35 am
Forum: Images du Jour
Topic: First Fusion for Liam David - Neutron Club Application
Replies: 14
Views: 6477

First Fusion for Liam David - Neutron Club Application

Today, December 25, 2016, I ran my fusor with deuterium for the first time and I believe that I have achieved fusion. I have documented my progress semi-regularly on the forums for the past few years, mostly in the images du jour section, but I'll give an overview of my system before I discuss the r...
by Liam David
Wed Dec 07, 2016 12:20 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Don't Build This HV Feedthrough
Replies: 6
Views: 3764

Re: Don't Build This HV Feedthrough

For the smaller feedthrough, I used a 1/4" Swagelok cap with two o-rings in it since the ferrules I used are stainless steel. On the larger one I'll be building, I'll use a 3/4 Swagelok cap with teflon ferrules, which will allow me to seal against the insulator and electrically connect to the inner ...
by Liam David
Tue Dec 06, 2016 4:06 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Don't Build This HV Feedthrough
Replies: 6
Views: 3764

Don't Build This HV Feedthrough

As I was ramping up the power to my fusor the other day, my Spellman supply tripped and I heard some arcing at around 21kV. I couldn't find the source of the problem until I looked behind the lead vest I had draped over the chamber. The custom HV feedthrough I made arced through the insulator, and w...
by Liam David
Sat Dec 03, 2016 4:41 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 71613

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

It's a 60k resistor, and operating it with vs. without the resistor seems to have very little effect.
by Liam David
Sat Dec 03, 2016 4:41 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 71613

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

It's a 60k resistor, and operating it with vs. without the resistor seems to have very little effect.
by Liam David
Sat Dec 03, 2016 2:44 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA
Replies: 157
Views: 71613

Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

I ran the functioning power supply with my fusor today and had some problems. I could turn the voltage up to 27kV, but plasma would not establish at any voltage around 15mtorr. Turning the voltage above 27kV got plasma to establish for a fraction of a second, but the over current light came on immed...