Search found 128 matches

by Bruce Meagher
Thu Mar 28, 2019 4:01 pm
Forum: Images du Jour
Topic: We've got plasma!
Replies: 7
Views: 4050

Re: We've got plasma!

Your team has a very nice looking setup. I would suggest you be careful reporting your pressure results with such precision. I would be surprised if your pressure gauge has the precision or accuracy to report to the tenth of a millitorr. With the proliferation of digital gauges it's easy to forget t...
by Bruce Meagher
Mon Mar 18, 2019 6:37 pm
Forum: Announcements and Site Administration Topics
Topic: Commentary on Doing Fusion
Replies: 17
Views: 9367

Re: Commentary on Doing Fusion

Here’s my take… If you look back to the first “youngest” fusonieer, Taylor, we see his fusor was hardly a solo effort. Taylor's first working fusor was built in a lab at the University of Nevada, with many, if not most, of the parts and detection gear coming from the university. In several of Taylor...
by Bruce Meagher
Thu Mar 14, 2019 10:13 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Vaccum Leak Testing / Technique and Power Supply Question
Replies: 18
Views: 10042

Re: Vaccum Leak Testing / Technique and Power Supply Question

Ian, I think you’re giving incorrect advice on vacuum pump oil. Look at the experiment Tyler ran to see why typical A/C vacuum oil is a poor choice http://www.fusor.net/board/viewtopic.php?f=10&t=12189&p=80054&hilit=Tyler#p80054 I'd recommend ballasting the pump for a couple hours with the inlet bla...
by Bruce Meagher
Thu Feb 14, 2019 6:09 pm
Forum: Vacuum Technology (& FAQs)
Topic: Cleaning/Repairing Edwards E2M5
Replies: 27
Views: 14225

Re: Cleaning/Repairing Edwards E2M5

Before you disassemble your pump are your sure you don't have a leak around the BSP threads on the intake flange? I know I steered you to the inexpensive intake flange, and as I mentioned this cheap version does not have a proper o-ring seal. The BSP threads are straight making it a little more diff...
by Bruce Meagher
Thu Feb 07, 2019 7:13 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 16585

Re: Construction of Neutron Grade Fusor

Congratulations Enzo! It’s great seeing you working closely with your dad to create and run some cool science experiments. I believe you are the first person to use the GS Neutron detector to claim fusion. It seemed like you went through some issues, and it would be a good separate post to describe ...
by Bruce Meagher
Thu Feb 07, 2019 6:24 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Reaching Out
Replies: 1
Views: 1665

Re: Reaching Out

Hi Jack,

I'm in San Diego and can meet up if you're willing to make the drive down from OC. PM or email me.

Bruce
by Bruce Meagher
Tue Jan 22, 2019 8:39 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 16585

Re: Construction of Neutron Grade Fusor

It’s great you’re continuing to gather data. From the video it would appear you are producing lots of neutrons, but running the test mentioned previously should help your case. My inverse square law comment was about the impact of moving the detector farther from the core, but as you noted it also a...
by Bruce Meagher
Mon Jan 21, 2019 5:11 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 16585

Re: Construction of Neutron Grade Fusor

Excellent job Enzo and dad! You guys have created a very nice setup. Couple comments: In the video when you were doing the unmoderated runs you sometimes drop the tube slightly behind the moderator. Leaving the moderator there will still present some thermal neutrons to the tube (explaining a few of...
by Bruce Meagher
Tue Jan 15, 2019 7:54 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 24
Views: 11877

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

I believe an NaI scintillator is the wrong device for optimizing a low energy ion beam. IMO, the very first step would be measuring the beam current with a faraday cup and an electrometer. Alpha’s from #1 will not make it through your window (edit: I assume you mean helium ions from an ion source no...
by Bruce Meagher
Fri Jan 11, 2019 6:19 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 24
Views: 11877

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

Harald, I’ll be following your efforts with much interest. I would imagine you’ll have to do a complete teardown to really understand what you have purchased. There is no way of knowing the signals on the connectors unless you reverse engineer the electronics inside (or get a schematic from Rigaku)....