Search found 1303 matches

by John Futter
Fri Dec 11, 2020 6:42 am
Forum: Interesting Links
Topic: Selected Topics in Nuclear Electronics
Replies: 3
Views: 1652

Re: Selected Topics in Nuclear Electronics

Cai what a blast from the past. All of the theory in there I was taught in my analog electronics class in the mid 70's had not remember most of it until seeing that, I still understand it all!!! now of course there are monolithic solutions to most of the circuit blocks. I cut my teeth repairing nucl...
by John Futter
Tue Dec 01, 2020 4:15 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection moderator embedded activation!
Replies: 31
Views: 4452

Re: Neutron detection moderator embedded activation!

Richard
Change the "beat gun " source to "Beta gun" source in your diagram

but well done
by John Futter
Tue Dec 01, 2020 4:04 am
Forum: Vacuum Technology (& FAQs)
Topic: Home built mass spectrometer
Replies: 15
Views: 1899

Re: Home built mass spectrometer

Ok thanks for the update on how you are doing it The double peaks might be from not having a load on your acceleration voltage so that what is commanded to the power supply is not the actual voltage due little load and some stray capacitance in your system keeping the actual acceleration voltage hig...
by John Futter
Mon Nov 30, 2020 7:29 am
Forum: Vacuum Technology (& FAQs)
Topic: Home built mass spectrometer
Replies: 15
Views: 1899

Re: Home built mass spectrometer

You get double peaks with your magnets remanence ie it remembers a bit of field when at zero current. There are techniques to buck this but using a field probe is the best way and close the magnetic loop ie your electronics will automatically buck the remanence. so peaks going up in current are shif...
by John Futter
Thu Nov 19, 2020 5:32 am
Forum: Images du Jour
Topic: First turbo pumpdown - smooth sailing!
Replies: 24
Views: 2017

Re: First turbo pumpdown - smooth sailing!

Christoffer I'm puzzled by the high turbo temp 60 degrees is high considering assumed no load ie blanked off. when a turbo that hasn't been used for some time is started you are supposed to ramp it up part way through its range and stop doing it again and again creeping higher in rpms. This is to re...
by John Futter
Wed Nov 11, 2020 4:24 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Low current, high voltage safety
Replies: 4
Views: 679

Re: Low current, high voltage safety

Sam Even these little supplies are lethal if used with an output capacitor And by this I mean capacitance such as maybe you using a coax cable ie about 30pf per foot not including the capacitance of the last multiplier output stage to connect with all of these will give a very nasty current spike th...
by John Futter
Sun Nov 08, 2020 7:28 am
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ - How to boost fusion in operation - Wall loading and cooling
Replies: 16
Views: 1372

Re: FAQ - How to boost fusion in operation - Wall loading and cooling

Yes BUT!
I could also be hydrogen from water adsorption in the system being disassociated by ionic conditions from the plasma IE H+ being liberated
Richards supposition is worth the test, if all deuterium then plenty of neutrons, if only a few then contamination from H+ and other ions
by John Futter
Sat Nov 07, 2020 4:11 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Quick and dirty PIGatron
Replies: 9
Views: 1816

Re: Quick and dirty PIGatron

Maciek You do not need to put multiple holes for gas distribution You are in the molecular flow region at these vacuums so the gas fills (expands to fill) the void immediately. So one small hole would be ample and help with gas regulation. Also as you have surmised the exit canal could be smaller I ...
by John Futter
Wed Nov 04, 2020 6:13 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Electroacoustic resonance and fusion
Replies: 6
Views: 2696

Re: Electroacoustic resonance and fusion

A Troll who does not read the rules!@!!!
by John Futter
Mon Oct 26, 2020 6:11 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor Grid from the ball in the center of a Plasma Ball
Replies: 4
Views: 787

Re: Fusor Grid from the ball in the center of a Plasma Ball

Jack
It might help if you followed the rules
1./ please amend your name from Jack W to Jack Wilson
2./ Your first post should have been in the "please introduce Yourself Forum"

Your question above should have been asked in the "new user chat area"