Search found 63 matches

by Robert Dwyer
Sun Dec 09, 2018 11:19 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: My progress II
Replies: 21
Views: 1999

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: 1504

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: 1422

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: 906

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: 1515

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: 883

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...
by Robert Dwyer
Fri Mar 30, 2018 11:24 pm
Forum: New User Chat Area
Topic: TIG welding advice.
Replies: 2
Views: 701

Re: TIG welding advice.

I was first taught to TIG weld by a coworker of mine who had been in the welding industry for years before deciding to pursue and engineering degree. He first had me watch him "stack beads" both with and without filler rod. He then had me do the same on some pieces of scrap stainless steel. Stacking...
by Robert Dwyer
Thu Mar 22, 2018 3:59 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Robert Dwyer Fusor Progress
Replies: 37
Views: 8443

Re: Robert Dwyer Fusor Progress

Hello Everyone, I have not posted in a while and I thought I might make an update on some of the latest news regarding my fusor. First, I did 3 more runs at varying distances (16cm, 12cm, 10cm from source), and found the average output of my device to be 220,000 n/s when running at 50kv at 4.7ma wit...
by Robert Dwyer
Thu Mar 22, 2018 3:31 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Helium-3 Fusor Thread
Replies: 15
Views: 4328

Re: Helium-3 Fusor Thread

Jackson, This sounds like a fun project. The acquisition of He3 would seem to be the hardest, along with obtaining a kilowatt-level power supply to run your fusor and 80kv or higher. You may be able to get lucky and find a university or old radiology lab that may have spare power supplies used in ol...
by Robert Dwyer
Sun Jan 07, 2018 4:18 am
Forum: Vacuum Technology (& FAQs)
Topic: Severe Outgassing Problems
Replies: 7
Views: 1137

Re: Severe Outgassing Problems

Never use Isopropyl for vacuum cleaning! It contains lots of water that will embed itself into the chamber walls then outgass during pump down. Acetone is ok, but still has the an issue with leaving films and some some water that may outgass. At my work we primarily use methonal for cleaning vacuum ...