Search found 67 matches

by Robert Dwyer
Thu Jan 03, 2019 2:08 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 24
Views: 1720

Re: How to figure out the specs of old Rigaku scintillation tube probe?

The radiation safety aspect of operating such a supply cannot be overstated. At 50kv and 300ma the amount of x-rays produced in a typical fusor will be copious and lethal. At 50kv 5ma, I was producing a measured dose of 2mrem/hr 4 feet away from my device. Assuming you aren't running a a true ion be...
by Robert Dwyer
Tue Jan 01, 2019 3:35 am
Forum: Fusion --- Past, Present, and Future
Topic: NIF 1.9e16 Neutron Shot!
Replies: 5
Views: 646

Re: NIF 1.9e16 Neutron Shot!

I've always wondered how much of NIF's overbudget and delay was a lack of understanding of the materials needed (I.E. the short lifetime of the laser glass, building an in-situ cryogenic fill station rated for Tritium), how much of it was bureaucracy, and how much was mismanagement or willfull misin...
by Robert Dwyer
Mon Dec 31, 2018 6:36 am
Forum: Fusion --- Past, Present, and Future
Topic: NIF 1.9e16 Neutron Shot!
Replies: 5
Views: 646

NIF 1.9e16 Neutron Shot!

I was browsing the internet for some information on x-ray plasma diagnostics, when I came across this article from June from LLNL. NIF achieved a record shot 1.9e16 neutrons from a shot. That's a lot of neutrons! This outperforms the little reactor at my university, as well as some of the smaller TR...
by Robert Dwyer
Mon Dec 31, 2018 6:02 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 24
Views: 1720

Re: How to figure out the specs of old Rigaku scintillation tube probe?

It says in the article you posted that this is an x-ray tube not a scintillator. Good luck powering it, but I still suggest you dont try as 50kv 300ma x-ray tube is lethal.
by Robert Dwyer
Sun Dec 09, 2018 11:19 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 27
Views: 3353

Re: My progress II

It looks like the plasma may be heating the chamber walls and cause outgassing which explains the pressure spike. I will say that when I operated my fusor which was made from a 4-way cross I could not have a stable plasma below 30 microns. I tried my hardest to get my pressure as low as I could as I...
by Robert Dwyer
Wed Oct 24, 2018 8:33 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Overview of D-D and D-T Fusion Detectors
Replies: 16
Views: 2350

Re: Overview of D-D and D-T Fusion Detectors

One of my jobs is working in fusion neutron detection for pulsed power. I cannot name one of the neutron detection methods that are in the hands of the amaeture that have not been mention here. If you want to try and detect D+T fusion reactions you can try, good luck. The same detection methods for ...
by Robert Dwyer
Wed Oct 24, 2018 8:07 pm
Forum: New User Chat Area
Topic: Radio waves to increase fusion yield
Replies: 12
Views: 1883

Re: Radio waves to increase fusion yield

I really would not suggest using microwaves, due to the potential danger, until you get more experience working with Rf plasmas under your belt. I work in a lab that studies RF generated plasmas and have conducted research on various topics of interest to those in fusion (turbulence, Ion-neutral col...
by Robert Dwyer
Fri Sep 28, 2018 3:05 am
Forum: New User Chat Area
Topic: Budget and Insulator Questions
Replies: 7
Views: 1179

Re: Budget and Insulator Questions

If you are on a campus that is doing research that requires vacuum equipment, almost certainly you can find a professor that knows of a storage cabinet that contains spare gauges, flanges, pumps etc... I was AMAZED at what I have found laying around in old storage closets at my university, under pil...
by Robert Dwyer
Tue Jun 12, 2018 2:01 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Atlas of Neutron Capture Cross Sections
Replies: 3
Views: 1696

Atlas of Neutron Capture Cross Sections

Hello All, In my time working with various neutron diagnostics, I came across this very useful tool I thought I would share. https://www-nds.iaea.org/ngatlas2/ This is an Atlas of Neutron capture cross sections vs. energy compiled by those at the IAEA Nuclear Data Center. Be it for fun, or for detec...
by Robert Dwyer
Wed Jun 06, 2018 9:03 pm
Forum: New User Chat Area
Topic: Metal Deuteride Grid Idea
Replies: 1
Views: 985

Re: Metal Deuteride Grid Idea

In reality, most metal grid materials would work. You run into issues of ion bombardment, heating, etc... which effects material thickness and your overall design. Tantalum is a good high temperature material for a fusor. I've used both molybdenum and niobium grids before with no problem. Even Stain...