Search found 325 matches

by Jim Kovalchick
Mon Jan 27, 2020 8:08 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor Running, No Neutron Detection
Replies: 15
Views: 248

Re: Fusor Running, No Neutron Detection

I'm not convinced it's your counter. 2 to 4 mA at 25 to 30 kV is not necessarily a lot of fusion in a small cross fusor. My cross fusor started popping neutrons out at around 8 to 10 mA and above 30. The results were variable too with one day neutrons and next none. Have you tried different gas flow...
by Jim Kovalchick
Thu Jan 23, 2020 12:38 pm
Forum: Announcements and Site Administration Topics
Topic: A biography based forum for select neutron club members
Replies: 3
Views: 166

Re: A biography based forum for select neutron club members

Andrew Seltzman comes to mind for me. His work included innovative grid cooling and ion sources. He also has long history of contribution to the forum.
by Jim Kovalchick
Tue Jan 21, 2020 12:50 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: First attempt at activating Indium
Replies: 5
Views: 389

Re: First attempt at activating Indium

Nice work Mark! When I read that you used big blocks of parafin, I was reminded of a historic treasure I recently visited in Munich. At the Deutsches Museum, they exhibit Otto Hahn's lab desk complete with version of Meitner's experiment that first measured fission, complete with a big block of wax....
by Jim Kovalchick
Fri Jan 17, 2020 4:14 pm
Forum: Images du Jour
Topic: Visit to Jon Rosenstiel's
Replies: 7
Views: 558

Re: Visit to Jon Rosenstiel's

Thanks Frank. I figured he was looking at either proton recoil or xrays/gammas because I dont see a moderator.
by Jim Kovalchick
Fri Jan 17, 2020 11:17 am
Forum: Images du Jour
Topic: Visit to Jon Rosenstiel's
Replies: 7
Views: 558

Re: Visit to Jon Rosenstiel's

Ian, trace it out from his chamber to the vacuum valve. Looks like a turbo to me.

I'm interested in what he's trying to detect with the pmt.

Jim K
by Jim Kovalchick
Tue Jan 14, 2020 9:13 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Increasing use of cylindrical fusors
Replies: 5
Views: 454

Re: Increasing use of cylindrical fusors

When I was breaking in my fusor, I gradually over successive runs would raise my voltage in steps with current relatively steady. I rode the Paschen curve by a combination of throttling closed the d injection and/or cracking my vacuum valve open a little more. I experienced good control on multiple ...
by Jim Kovalchick
Tue Jan 14, 2020 5:42 am
Forum: Images du Jour
Topic: Jim Kovalchick -My attempt at smaller fusor
Replies: 26
Views: 1536

Re: Jim Kovalchick -My attempt at smaller fusor

Jon, I wouldn't be surprised if it was, but I don't know if the titanium I used was an alloy or not. I bought a small sheet of it at a past HEAS. I think from T.R. Leary.

I'm away from my lab for a while now to check, but I think the sheet had some numbers and/or letters etched on it.



Jim K
by Jim Kovalchick
Mon Jan 13, 2020 1:15 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Increasing use of cylindrical fusors
Replies: 5
Views: 454

Re: Increasing use of cylindrical fusors

I'm not bought into titanium grids. I think they liberate gas too much for my liking.
by Jim Kovalchick
Tue Jan 07, 2020 2:51 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Amptek Digital Pulse Processor
Replies: 13
Views: 1096

Re: Amptek Digital Pulse Processor

I had some time this evening to tinker with my DP5 board. I put a dab of solder between the pads at R28. I connected it by usb to my Windows 10 laptop which auto detected and loaded the correct drivers. I installed the DppMCA software which connected to the DP5 without issue. When I get more time, I...
by Jim Kovalchick
Sun Jan 05, 2020 11:32 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: CMOS Neutron Detection
Replies: 4
Views: 201

Re: CMOS Neutron Detection

There is no doubt that CCDs and CMOS show interaction events for gamma and higher energy xrays. Some of the interactions cause pixel sparkle and sometimes permanent damage. In my years of work at a nuke plant I've seen plenty of toasted cameras, mostly ccd, toasted by gammas. My readings are far fro...