Search found 310 matches

by Jim Kovalchick
Wed Jul 25, 2018 11:15 pm
Forum: New User Chat Area
Topic: Trying for Tritium
Replies: 6
Views: 307

Re: Trying for Tritium

A person who is licensed to operate a reactor is only licensed to operate that reactor. A facility license is only applicable to the activities described in its license.

What you describe is very likely illegal for lots of reasons.
by Jim Kovalchick
Wed Jul 18, 2018 12:17 pm
Forum: Images du Jour
Topic: Killer deal on a GeLi gamma spec
Replies: 6
Views: 607

Re: Killer deal on a GeLi gamma spec

I'm not sure why you believe that intrinsic germanium detectors are inherently GeLi. High purity germanium detectors which do not drift and can be warmed are intrinsic. Looking at the vintage of your detector, I would say you have a chance that it could work if cooled. As near as I can tell, your de...
by Jim Kovalchick
Tue May 01, 2018 3:29 pm
Forum: Images du Jour
Topic: MATER-1
Replies: 10
Views: 1848

Re: MATER-1

Roberto, Their stem has a relatively thick alumina tube insulating it between the insulator and the stainless grid connector. Originally they put a thin alumina tube on a stem piece after the connector and before the grid. This thin piece seemed to be too thin at high voltages and sparked a great de...
by Jim Kovalchick
Tue May 01, 2018 11:18 am
Forum: Images du Jour
Topic: MATER-1
Replies: 10
Views: 1848

Re: MATER-1

This is an amazing fusor, and I felt privileged to participate in some of the first operations of it. It controls like a dream compared to my own especially after the alumina tube was removed from the stem just approaching the grid. Some improvements like a tungsten grid, a secondary ground grid, an...
by Jim Kovalchick
Tue Feb 20, 2018 6:28 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Saving another PNC-1
Replies: 6
Views: 1965

Re: Saving another PNC-1

I have never seen a schematic or manual. There are a few common issues. 1. Tube failure - To test for tube failure, attach the tube to a different device like a Ludlum 2000 scaler. Adjust the voltage to 1400 to 1600 and use a 1.5 mV threshold. See if you can get some counts. You can also check to se...
by Jim Kovalchick
Tue Feb 13, 2018 10:42 am
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 43
Views: 5542

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

Richard, I dont watch pressure much during runs because I don't control by it. I recall around 7 mtorr when I was done. That number is uncorrected for deuterium.
by Jim Kovalchick
Mon Feb 12, 2018 8:25 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 43
Views: 5542

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

Tried to break in my new grid today. Still a little noisy nearing 40 kV but starting to settle below that. Neutron numbers are improving with this grid's ability to take current. At 38 kV and 12 mA my BF3 tube was around 700 cpm. My rough estimate is 1.7+ million neutrons/sec.
by Jim Kovalchick
Sat Feb 03, 2018 3:15 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusion Claim - Jackson Oswalt
Replies: 15
Views: 2777

Re: Fusion Claim - Jackson Oswalt

Congrats Jackson!

You have a fine system. What are your plans for it? I recommend some activation. With a small fusor you can get in close with your samples. Silver is an easy starter.
by Jim Kovalchick
Mon Jan 29, 2018 12:15 pm
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 43
Views: 5542

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

A few more notes on the grid construction techniques I am using: 1. I wasn't sure at first how I was going to cut the braided tungsten. I have a hard enough time getting good cuts on single strand tungsten. You can't use cheap wire cutters because it will chunk your cutting edge. To my pleasure, I w...
by Jim Kovalchick
Mon Jan 29, 2018 12:01 am
Forum: Images du Jour
Topic: Wait, what? Tiny fusors? Not for me!
Replies: 43
Views: 5542

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

My current grid gets a little thermionically unstable at the high end of my operating range. I would like a little more current and voltage so I am pondering a new grid. I haven't installed it yet, but this one uses heavy braided tungsten instead of single strand. This also only has two loops becaus...