Search found 1270 matches

by Jon Rosenstiel
Sat Mar 27, 2021 2:51 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Activation of Uranium (Redux)
Replies: 3
Views: 558

Re: Neutron Activation of Uranium (Redux)

I was really impressed at how stable she ran. I did minutely readjust the throttle valve a few times during the run, mainly because I didn’t want the hv to creep up the slightest... have already gone through too many feedthroughs. I have some quartz tubing, one of these days I’m going to try my hand...
by Jon Rosenstiel
Fri Mar 26, 2021 9:27 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Activation of Uranium (Redux)
Replies: 3
Views: 558

Neutron Activation of Uranium (Redux)

Previous work from Carl Willis and myself… https://fusor.net/board/viewtopic.php?f=13&t=5846&p=38723&hilit=uranium#p38723 https://fusor.net/board/viewtopic.php?f=13&t=5860&p=34304&hilit=uranium#p34304 As expected, this latest attempt turned up the anticipated 74 KeV gamma from U-239. But what also t...
by Jon Rosenstiel
Wed Mar 03, 2021 12:42 am
Forum: Control and Instrumentation Hardware and Software
Topic: Software to collect and display measured data.
Replies: 16
Views: 1298

Re: Software to collect and display measured data.

Some years back I bought a data acquisition starter kit from these folks, works well for plotting leak-up rate.

https://www.dataq.com/

Jon Rosenstiel
by Jon Rosenstiel
Thu Feb 18, 2021 11:11 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 21
Views: 2907

Re: One more cube fusor

Wow! Very nice Finn, love what you've done with your cooling system. More than once I've sat staring at my cube trying to visualize how to configure cooling water passages similar to what you have done. Good, and very neat, work. Steampunk-ish indeed.

JonR
by Jon Rosenstiel
Thu Feb 18, 2021 10:06 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Titanium Coated Endcaps for the Cube Fusor
Replies: 20
Views: 1666

Re: Titanium Coated Endcaps for the Cube Fusor

Roberto,
I tried what this guy in the video shows, and it did result in a thin coating. But it's extremely slow, and the titanium wire filaments burn out much too easily.

https://youtu.be/-lh1LhoRBaY

JonR
by Jon Rosenstiel
Thu Feb 18, 2021 4:12 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Titanium Coated Endcaps for the Cube Fusor
Replies: 20
Views: 1666

Re: Titanium Coated Endcaps for the Cube Fusor

I wonder if titanium’s effect on neutron production is, in some way, related to its gettering action? During the coating process I’ve noticed that when the Ti pellets melt and start vaporizing chamber pressure drops about 2E-05 Torr.

JonR
by Jon Rosenstiel
Thu Feb 18, 2021 12:53 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Titanium Coated Endcaps for the Cube Fusor
Replies: 20
Views: 1666

Re: Titanium Coated Endcaps for the Cube Fusor

Thanks Roberto.

The endcaps have a concave radius, and from my experience titanium sheet is nearly impossible to form.

JonR
by Jon Rosenstiel
Thu Feb 18, 2021 12:11 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Titanium Coated Endcaps for the Cube Fusor
Replies: 20
Views: 1666

Re: Titanium Coated Endcaps for the Cube Fusor

Jim, Today I tried (twice) what you suggested, taking a reading at 40 kV after a 50 kV run. The changes were small, just the typical run to run differences. I'm attaching a paper with info gleaned from the K J Lesker website. As I pretty much followed what they had done I would guess the Ti coating ...
by Jon Rosenstiel
Wed Feb 17, 2021 10:45 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Titanium Coated Endcaps for the Cube Fusor
Replies: 20
Views: 1666

Re: Titanium Coated Endcaps for the Cube Fusor

Thank you for the kind words Richard, but you guys never get to see all the stuff I screw up and have to toss out.

JonR
by Jon Rosenstiel
Wed Feb 17, 2021 1:29 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Titanium Coated Endcaps for the Cube Fusor
Replies: 20
Views: 1666

Re: Titanium Coated Endcaps for the Cube Fusor

Thanks guys.

Liam, as of yet I haven't noticed any issues with outgassing, she's been quite stable. Did have lots of outgassing/runaway problems (not sure which it was) with a titanium cathode. Now I'm wondering about how well an embedded titanium target (al la Mark Rowley) would work.

JonR