Search found 1289 matches

by John Futter
Thu Nov 19, 2020 5:32 am
Forum: Images du Jour
Topic: First turbo pumpdown - smooth sailing!
Replies: 19
Views: 628

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: 444

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: 911

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: 6
Views: 1075

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: 968

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: 596

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"
by John Futter
Sat Oct 24, 2020 6:22 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Portable XRF detector window repair
Replies: 11
Views: 999

Re: Portable XRF detector window repair

I use a wad cutter to cut foils
Be is used as it is the first stable (sort of) metal in the periodic table ie low Z so low energy gammas / x-rays can go throught it
by John Futter
Thu Oct 22, 2020 9:35 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Portable XRF detector window repair
Replies: 11
Views: 999

Re: Portable XRF detector window repair

I do not understand
I put up 15micron thickness solution over your 13 micron measurement
and you need 120mm when you said originally 13 microns

or is the detector nearly 5 inches in diameter --i doubt\\

please clarify!!!!
by John Futter
Wed Oct 21, 2020 6:02 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Portable XRF detector window repair
Replies: 11
Views: 999

Re: Portable XRF detector window repair

use new Be foil
http://www.goodfellow.com/catalogue/GFC ... V2hvddblfZ
BE000210 looks right.
Be careful it is not good for you
you need the Be foil to keep it light tight and to remove the low energy spectrum (noise)
by John Futter
Tue Oct 20, 2020 12:37 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: My preamp design
Replies: 1
Views: 348

My preamp design

Couldn't put the schematic up in the FAQ section so here it is


Protel Schematic.pdf
(18.33 KiB) Downloaded 45 times