Search found 452 matches

by ian_krase
Thu Oct 11, 2018 2:58 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Titanium walls
Replies: 4
Views: 586

Re: Titanium walls

Sputtering Ti is also possible.

You could research Quartz Crystal deposition monitors. The detuning of a Crystal oscillator measures the mass per area.

You could also possibly measure mass loss of your Ti source with sensitive analytical balance.
by ian_krase
Thu Sep 27, 2018 5:44 am
Forum: Please Introduce Yourself
Topic: Introduction
Replies: 3
Views: 376

Re: Introduction

Yeah, maybe the Doug Coulter way is the way to go.

(I'm looking at rural land right now actually)
by ian_krase
Thu Sep 27, 2018 5:43 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: What vacuum chamber do I use?
Replies: 10
Views: 523

Re: What vacuum chamber do I use?

An alternative to the hemispheres is a smaller (2 to 4 inches) "pipe tee" fusor.
by ian_krase
Thu Sep 27, 2018 5:42 am
Forum: New User Chat Area
Topic: Budget and Insulator Questions
Replies: 7
Views: 654

Re: Budget and Insulator Questions

You may not need to insulate the stalk inside your fusor - Paschen's Law is a funny thing. I didn't in my very rudimentary demo fusor If you do, you can buy alumina ceramic tubing or "fish spine" beads from McMaster. Not too costly. Or even use kapton tape (very cheap dirty solution). You can use KF...
by ian_krase
Thu Sep 27, 2018 5:32 am
Forum: New User Chat Area
Topic: Would a heated Barium oxide filament survive in a deuterium environment?
Replies: 4
Views: 246

Re: Would a heated Barium oxide filament survive in a deuterium environment?

I would worry more about residual air every time you go to to air. Barium is mostly used in vacuum tubes that are never ever vented. A better idea might be yttrium as used in ion gauges - or just bare tungsten, it works and is vastly simpler. I'm curious at this choice of ion gun - it's my impressio...
by ian_krase
Tue Sep 11, 2018 7:46 pm
Forum: Images du Jour
Topic: My first plasma
Replies: 12
Views: 1244

Re: My first plasma

One thing that might be tried is to have separate beam blocks and structural vacuum chamber. The former can be made of cheap thin glass.
by ian_krase
Sun Sep 09, 2018 8:12 am
Forum: Images du Jour
Topic: Sharing hamfest booty images
Replies: 27
Views: 5499

Re: Sharing hamfest booty images

Nice valve! I paid more like 30 for mine!
by ian_krase
Sun Sep 09, 2018 4:07 am
Forum: Images du Jour
Topic: My first plasma
Replies: 12
Views: 1244

Re: My first plasma

Not sure what you mean by an "arc from the grid to the glass" -- may need better pictures.

Your glass looks too clear for sputtering to be a big problem. Is there a hot spot?
by ian_krase
Thu Sep 06, 2018 2:38 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Capacitor blasts and automatic impedance matching
Replies: 1
Views: 259

Capacitor blasts and automatic impedance matching

I am sort of curious whether there's any practical circuit that automatically does some form of impedance matching on capacitor discharges -- can crushers, spot welders, flashlamp flashers, etc.
by ian_krase
Thu Aug 30, 2018 5:30 am
Forum: Vacuum Technology (& FAQs)
Topic: convectron 275 tube and controller
Replies: 9
Views: 1202

Re: convectron 275 tube and controller

Edge 10L -> Shield -> 1 -> Null Whiteblack Edge 11 -> Lowp -> 3 -> Tub 3 Redblack Edg 12 13 -> HighP -> 4 - > Tub1 Red Edge 14 -> Comp -> 8 -> Tub2 Greenblack Edge 15 -> Sense -> 9 -> Tub5 Green Here is the wiring table from my own attempt. The same for both analog and digital gauge controllers. The...