Search found 454 matches

by Wilfried Heil
Mon Sep 10, 2012 12:49 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Is there any possible replacement for platinum wire in the electrolysis process?
Replies: 10
Views: 3817

Re: Is there any possible replacement for platinum wire in the electrolysis process?

<r>> But wouldn't the carbon electrode contaminate the D2O solution and be carried by air vapor when the D20 solution bubbles ?<br/> No. The pencil mines are made of a mixture of carbon and clay. They have a tendency to flake off during electrolysis, but all of that stays in the water. You can use a...
by Wilfried Heil
Mon Sep 10, 2012 11:23 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Is there any possible replacement for platinum wire in the electrolysis process?
Replies: 10
Views: 3817

Re: Is there any possible replacement for platinum wire in the electrolysis process?

<t>Certainly. You can use carbon electrodes from a pencil or from the inside of an old AA size battery. They will produce a black slurry in the water during electrolysis, which shouldn`t matter for this purpose.<br/> <br/> You can get any number of dead batteries from the collection box in a departm...
by Wilfried Heil
Thu May 03, 2012 10:22 am
Forum: Vacuum Technology (& FAQs)
Topic: Baratron
Replies: 12
Views: 4589

Re: Baratron

<t>There is an alternative, also from MKS. The MicroPirani 925 Series is a micromachined Pirani gauge that can measure in the lower millitorr region. The advantage is that it will work from atmosphere down to fusion pressure. It has just the right pressure range for a fusor, where the working pressu...
by Wilfried Heil
Sun Jan 15, 2012 5:06 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Soundcard-MCA using Ludlum Model 3 (+NaI(Tl))
Replies: 7
Views: 3941

Re: Soundcard-MCA using Ludlum Model 3 (+NaI(Tl))

<r>Here is the manual for the Model 3, which includes a full schematic.<br/> <br/> You can pick off the pulses at pin 3 of the "accessory connector" P2. <br/> Pins 2 and 6 are GND. (See p. 33 of the manual).<br/> <br/> These are digital pulses only, useful for counting. The sound signal which goes t...
by Wilfried Heil
Tue Aug 23, 2011 6:05 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Anomaly in demo fusor.
Replies: 15
Views: 6375

Re: Anomaly in demo fusor.

<r>Could it be that you have reversed the polarity with your new flyback supply?<br/> TV flybacks produce positive high voltage while the fusor's hollow cathode needs a negative voltage.<br/> <br/> What you see is a stable blob of plasma, which self-assembles under the right conditions:<br/> <URL ur...
by Wilfried Heil
Tue Aug 02, 2011 8:54 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Question about radiation shielding of reactors
Replies: 10
Views: 3906

Re: Question about radiation shielding of reactors

It'll be a long way to go before the fusor becomes a radiation problem.

The only real danger that I see is the electrical shock hazard, or maybe accidentally
touching the shell while it's still hot.
by Wilfried Heil
Sat Jul 02, 2011 5:43 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Voltage multiplier inside vacuum chamber
Replies: 14
Views: 5741

Re: Voltage multiplier inside vacuum chamber

<r>Hello and yes, something like that has been done. Have a look under "Dynamitron" high voltage generators.<br/> This is not a vacuum chamber, but one filled with an insulating gas like SF6.<br/> <URL url="http://accelconf.web.cern.ch/Accelconf/p65/PDF/PAC1965_0227.PDF"><LINK_TEXT text="http://acce...
by Wilfried Heil
Wed Jun 15, 2011 5:35 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Solid State Photo Detectors
Replies: 4
Views: 2070

Re: Solid State Photo Detectors

<r>CZT detectors can be used in arrays. Some advantages are that they are thicker than Si diodes and have very low dark current. They're not outrageously expensive for the smaller sizes.<br/> <URL url="http://www.icproto.com/typeroom/assets/uploads/CSR_2009-OctNov-111309_CZT.pdf"><LINK_TEXT text="ht...
by Wilfried Heil
Sat Jun 11, 2011 8:37 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Solid State Photo Detectors
Replies: 4
Views: 2070

Re: Solid State Photo Detectors

<r>Indeed there are "emerging technologies", which tend to replace the PMTs.<br/> <br/> You can use APD modules, if the 5 mm detector size is enough for you:<br/> <URL url="http://sales.hamamatsu.com/assets/pdf/parts_C/c5331_series_kacc1007e05.pdf"><LINK_TEXT text="http://sales.hamamatsu.com/assets/...
by Wilfried Heil
Thu May 12, 2011 3:48 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Inquiry response from LND - 3He tube
Replies: 20
Views: 5363

Re: Inquiry response from LND - 3He tube

<t>>Also I spoke with BTI and they said they had a 9 mrem option instead of the standard 33. I think that may be a reasonable option for the lower neutron output fusors<br/> <br/> The number on the BTI detector stands for bubbles per mrem, so the -33 is the more sensitive one.<br/> <br/> I would als...