Search found 298 matches

by Jim Kovalchick
Fri Jan 12, 2018 10:03 pm
Forum: Please Introduce Yourself
Topic: Hello from Poland
Replies: 1
Views: 92

Re: Hello from Poland

Welcome Janusz. Good luck with your studies. We look forward to hearing about any fusor progress you make.

Jim Kovalchick
by Jim Kovalchick
Mon Jan 08, 2018 3:54 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

Thanks Richard. At this point achieving big numbers isnt among my primary goals, but they will help. I am particularly interested in doing some activation and fiddling with alternate neutron detection methods. Next steps - not necessarily in order of priority 1. Shielding - I am at the point where t...
by Jim Kovalchick
Mon Jan 08, 2018 1:44 am
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

An evening run of my fusor at 39 kV and 8.5 mA yielded 400 cpm on my BF3 tube. Given the distance from the chamber and comparison reading of the same tube at Richard's I am estimating that my fusor has passed the 1 million neutron mark.
by Jim Kovalchick
Sun Jan 07, 2018 5:40 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

This morning I finally confirmed neutrons from this latest fusor. I used the BF3 from our PNC-1 and the standard PNC cad covered parafin block moderator, but connected to an old Ludlum 2200. At 38 kV, 8 mA, and 5.9 mtorr I measured 300 cpm well over a foot from the fusor center. The moderator pull t...
by Jim Kovalchick
Sun Jan 07, 2018 12:55 am
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

-38 kV, 8 mA, 6 millitorr

I'm convinced my neutron indication is the issue. Our PNC-1 is on the blink, but I think I can connect its BF3 tube to a scaler.
by Jim Kovalchick
Sat Jan 06, 2018 6:23 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

I'm still having trouble getting neutrons out of my fusor. I'm troubleshooting my detector, but I decided to also do a little glow cleaning. Here is a pretty picture of some liow voltage deuterium plasma 4000 V and 10 mA.
by Jim Kovalchick
Mon Jan 01, 2018 7:55 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

A few updates for my fusor: 1. I did some runs with deuterium, but even at elevated voltage the neutron numbers were dubious at best. 2. With deuterium versus air in addition to neutrons I was expecting a plasma color change from air and higher pressure Paschen points. For a given voltage the Pasche...
by Jim Kovalchick
Thu Dec 28, 2017 12:44 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

As far as the ticking I was experiencing, it went away after I peeled the shielding on my hv x-ray machine cabling a few more inches back. I also rewrapped my insulation tighter and thicker with polyimide tape. I use polyimide on all my exposed conductor points. I have tested this on my new fusor un...
by Jim Kovalchick
Tue Dec 26, 2017 7:34 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

Dennis,
I just atripped back about 8 inches where there was only 4 before. This seemed to do the trick up to -40 kV. This is the highest voltage I've ever spent any time at. It made a nice tight spot of plasma.
by Jim Kovalchick
Tue Dec 26, 2017 5:39 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 35
Views: 1176

Re: Wait, what? Tiny fusors? Not for me!

First light for this chamber. 1. Started at -8 kV with air. 2. Walked voltage to - 17.8 kV holding about 8 mA. 3. Need to rework HV cable because I heard some ticking from the cable near tbe feed through at peak voltage. Probably dont have the shield stripped far enough back. 4. One of my grid wires...