Search found 1556 matches

by Dennis P Brown
Fri Jun 18, 2021 9:08 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Apparatus for Making a Deuterated Target
Replies: 5
Views: 177

Re: Apparatus for Making a Deuterated Target

Once you pump down, you close off the system and allow the deuterium to raise the system to its desired pressure, that extra 'T' isn't going to have much an impact; calculate the total volume for "zero torr". Then the volume of gas in the syringe - I bet the amount in the syringe is well above 10 mT...
by Dennis P Brown
Fri Jun 18, 2021 8:56 pm
Forum: Images du Jour
Topic: Finn Hammer, neutron club application
Replies: 11
Views: 233

Re: Finn Hammer, neutron club application

Well, first off, I can't open the vid of the neutrons/activation; it says its private. So, no go on that.

Also, you will need to associate numbers with your activation - so maybe post a graph of counts vs. time and post the results here so the 'YouTube' isn't completely necessary.
by Dennis P Brown
Tue Jun 15, 2021 10:18 am
Forum: Images du Jour
Topic: First hamfest in 18 months
Replies: 3
Views: 208

Re: First hamfest in 18 months

Isn't it simply fantastic that these incredible vaccines are so extremely successful and that life can finally get back to normal?
by Dennis P Brown
Thu Jun 10, 2021 11:32 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Custom Fusor Power Supply
Replies: 20
Views: 4951

Re: Custom Fusor Power Supply

Impressive work; you are really setting the bar for a home made power supply for a fusor that most could build. Keep experimenting and posting - you've created a great thread.
by Dennis P Brown
Sun Jun 06, 2021 10:38 pm
Forum: Images du Jour
Topic: Finn Hammer, fusor update.
Replies: 44
Views: 6538

Re: Finn Hammer, fusor update.

I submerged my ballast resistor under oil; fully synthetic auto oil since that is actually superior to many transformer oils. It not only electrically insulates it but dissipates heat significantly better than air.
by Dennis P Brown
Fri Jun 04, 2021 11:11 am
Forum: Images du Jour
Topic: Eastside Prep Fusor
Replies: 12
Views: 716

Re: Eastside Prep Fusor

The updates are nice and useful for proving work for evaluation for any listing. Nice set of pics - even more captions would be good, too. I really like the remote gas micro-valve gear drive/control system - clever. I see the lead shielding isn't painted - that is a safety issue that I am surprised ...
by Dennis P Brown
Wed Jun 02, 2021 7:06 pm
Forum: Images du Jour
Topic: CW, plasma, Paschen curve
Replies: 28
Views: 1125

Re: CW, plasma, Paschen curve

The output current the the NST isn't the main issue here and I wasn't being clear - the voltage multiplier caps will determine the output power and at 60 Hz that isn't going to be very much. The caps are charging too slowly.
by Dennis P Brown
Mon May 31, 2021 7:59 pm
Forum: Images du Jour
Topic: CW, plasma, Paschen curve
Replies: 28
Views: 1125

Re: CW, plasma, Paschen curve

A 60 Hz NST will never delivery any significant voltage and current for a CW that drives a plasma; once you hook it up to any real device to generate a plasma, the voltage will drop like a rock and the cap's will delivery very little current. Yes, a scope with its high impedance will show a differen...
by Dennis P Brown
Mon May 31, 2021 11:35 am
Forum: Vacuum Technology (& FAQs)
Topic: Diagnosing pressure rise in bell jar
Replies: 13
Views: 1318

Re: Diagnosing pressure rise in bell jar

Ever since I learned calculus, my simple math skills are terrible ... ;) ( I saw the top line as brown but now realize its two other colors that appear brown on my screen.) Fifteen microns per minute is a bit fast for simple out-gassing unless you have a huge surface volume, a very small, real leak ...
by Dennis P Brown
Mon May 31, 2021 11:24 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V - yet another whack at it.
Replies: 12
Views: 2533

Re: Fusor V - yet another whack at it.

The turtle wins over the 'too careless" faster hare.

I am guessing you are getting your new fusor ready for the October HEAS meeting? I certainly do not want to miss this one.