Search found 211 matches

by Jeroen Vriesman
Tue Feb 06, 2018 3:00 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Photon triggered Fusion
Replies: 10
Views: 8073

Re: Photon triggered Fusion

A free particle (e.g. D+) cannot absorb a photon, so the effect must be happening inside the D2 loaded Ti. Irradiating free D2 or D+ with X-rays is probably not doing anything. For a free particle momentum and energy cannot be conserved simultaneously for photon absorption, try it: photon: E=hv phot...
by Jeroen Vriesman
Fri Jan 19, 2018 9:20 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: High Voltage Supply for PMT
Replies: 9
Views: 3773

Re: High Voltage Supply for PMT

I tried a small royer-like oscillator with 2 TMS93.... CCFL transformers. These transformers are a bit bigger than the laptop CCFL transformers, which makes the supply a bit more powerful. The transformers are available on aliexpress, inexpensive. It produced about 2500V at 2mA. About 30kHz. I didn'...
by Jeroen Vriesman
Tue Dec 12, 2017 6:44 pm
Forum: Vacuum Technology (& FAQs)
Topic: Wire Yttria coating electrophoresis
Replies: 12
Views: 4129

Re: Wire Yttria coating electrophoresis

Ian,

I ordered a sample of the yttria colloid.
It was for free.
by Jeroen Vriesman
Sat Jun 17, 2017 4:37 pm
Forum: Vacuum Technology (& FAQs)
Topic: Wire Yttria coating electrophoresis
Replies: 12
Views: 4129

Re: Wire Yttria coating electrophoresis

Roberto,

thank you, that was exactly what I was looking for, I was thinking about electroplating tungsten with rhenium. Just don't know how yet...
by Jeroen Vriesman
Fri Jun 16, 2017 11:16 am
Forum: Vacuum Technology (& FAQs)
Topic: Wire Yttria coating electrophoresis
Replies: 12
Views: 4129

Re: Wire Yttria coating electrophoresis

Roberto, W/Re is indeed not that expensive usually. But (as far as I understand), I would need pure rhenium wire. The "enemy" is the tungsten-water cycle. Does tungsten-rhenium also suffer from this problem? This shows teh emission of yttria coated pure rhenium: http://www.sisweb.com/referenc/applno...
by Jeroen Vriesman
Tue Jun 13, 2017 9:07 am
Forum: Vacuum Technology (& FAQs)
Topic: Wire Yttria coating electrophoresis
Replies: 12
Views: 4129

Re: Wire Yttria coating electrophoresis

Dennis: I think vacuum would just make more bubbles. Roberto: thanks, I did know sisweb is selling it, but they don't have any prices on their site, bit afraid of the "request pricing", but I will ask them. Jerry: the basic procedure is in this post, we don have more for now. But as soon as we have ...
by Jeroen Vriesman
Mon Jun 12, 2017 1:38 pm
Forum: Vacuum Technology (& FAQs)
Topic: Wire Yttria coating electrophoresis
Replies: 12
Views: 4129

Wire Yttria coating electrophoresis

Hi all, Some preliminary experiments with yttria coating on tungsten: The result on the picture uses: a) an yttria colloid (10nm particles, water + acetic acid) b) a graphite anode (so we don't get any metallic contamination in the colloid, just Kolbe electrolysis) c) a 2% duty cycle -150V, 5A elect...
by Jeroen Vriesman
Thu Mar 16, 2017 9:05 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Repairing or reworking water damaged NaI(Tl) Crystals
Replies: 7
Views: 2691

Re: Repairing or reworking water damaged NaI(Tl) Crystals

I was talking to a chemist yesterday about this. He says the same thing as Rex and others in this thread "no way to get the water out". He said that diffusion of water is just way too slow, "it won't get out unless you kick it out". So the only other "maybe try this" guess I have is to try MIVAC; dr...
by Jeroen Vriesman
Wed Mar 15, 2017 2:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Repairing or reworking water damaged NaI(Tl) Crystals
Replies: 7
Views: 2691

Re: Repairing or reworking water damaged NaI(Tl) Crystals

I have no idea what this NaI-reworker might have done, but just thinking about it, I would try freeze-drying. Did it take a long time for him? (days?) I think about freeze drying because heating or vacuum alone could damage the crystal. But it's just a wild guess. Maybe the migration speed of water ...
by Jeroen Vriesman
Thu Mar 02, 2017 2:03 pm
Forum: Vacuum Technology (& FAQs)
Topic: Plasma + Fluorocarbon -> Leak-finding and... bad stuff?
Replies: 7
Views: 2209

Re: Plasma + Fluorocarbon -> Leak-finding and... bad stuff?

Some time ago I tried leak detection with the glow colour change method. I tried with argon and helium, but even letting in some helium or argon on purpose didn't change the colour. I didn't try difluoromethane, what is it that makes this gas so effective? Are there any other gases we should or shou...