Search found 11109 matches

by Richard Hull
Sun Jan 20, 2019 5:03 am
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 29
Views: 2204

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

The micromase was pushed by Lesker for a few years and is no longer available. It was great and could warrant about one order of magnitude below a good mechanical pump that could go under 10 microns on its own. It had its own internal heater to purge bad stuff out and clean itself up. It was found b...
by Richard Hull
Sun Jan 20, 2019 4:56 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 2444

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

Chris has it right. USB is still forming and might never stop evolving the RS serials and GPIB are so dead, they are set in stone. Slow yet reliable and easily worked with to this day. You pay for the late and great super fasts which may or may not survive a new operating system or connectivity rage...
by Richard Hull
Sun Jan 20, 2019 4:45 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 1791

Re: 50kV Supply

75khz may heat the ceramic caps a bit and reduce the full power duty cycle run times, but it is rare you would need tremendous full power runs. 40kv @ 10 ma is 400 watts. In Tesla work, it was found that the higher the spark interrupt rate, ceramic capacitors would drop in capacitance as the silver ...
by Richard Hull
Sun Jan 20, 2019 4:34 am
Forum: Announcements and Site Administration Topics
Topic: Straw Poll / Proposal for San Francisco Area mini-meetup
Replies: 32
Views: 2689

Re: Straw Poll / Proposal for San Francisco Area mini-meetup

Bold effort and commended to the greatest degree. Keep trying and all the very best wishes for you and all those fusioneers in CA.

Richard Hull
by Richard Hull
Sat Jan 19, 2019 5:35 am
Forum: Images du Jour
Topic: Joe Gayo's Fusor - Neutron Detection Upgrade
Replies: 29
Views: 2204

Re: Joe Gayo's Fusor - Neutron Detection Upgrade

My First fusion was with a mechanical pump that could hit 5 microns, backed by a micromaze that bottomed my TC gauge. (actual vacuum unknown). The best I ever did with fusor III was 250kn/s but I never got above 32 kv. Now that we are into the wall loading concept, day to day operation will see a bi...
by Richard Hull
Fri Jan 18, 2019 11:58 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: 50kV Supply
Replies: 24
Views: 1791

Re: 50kV Supply

As Joe mentioned, the "stack" is the thing. If you have a negative multiplier you are 80% there. The tough stuff is done for you. Provided you are a good bit electronic savvy. There is no such thing as a 50kv, 6ma stack.(multiplier) There is only a 50kv, 6ma "power supply". Who here, when talking el...
by Richard Hull
Fri Jan 18, 2019 11:20 pm
Forum: Announcements and Site Administration Topics
Topic: Straw Poll / Proposal for San Francisco Area mini-meetup
Replies: 32
Views: 2689

Re: Straw Poll / Proposal for San Francisco Area mini-meetup

I mean nothing derogatory, but state a rather curious observation I have noted over the years. I have followed this thread through its bumps, fits, starts and stops. You folks in CA. have tried a number of times to get together and it has seemed to crumble after many attempts. I truly feel sorry for...
by Richard Hull
Fri Jan 18, 2019 4:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 3128

Re: Construction of Neutron Grade Fusor

All of the foregoing is good advice. Get a stable plasma for more than a minute above 25 kv and at a pressure of about 5-20mT and that is where you are going to see early fusion results. Burst of neutrons are more likely bursts of RF pulses into the detector. Again, what is your detection method. I ...
by Richard Hull
Thu Jan 17, 2019 2:48 pm
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1612

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

We assume it is a negative output supply.

Richard Hull
by Richard Hull
Thu Jan 17, 2019 2:44 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 2444

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

Regarding HF sensing for synchronization for the Atmel IC. If you go native and don't use the IDE in the Arduino, I have no idea. I use the Int0 on the Arduino and am able to count and record up to about 24,000 pulse per minute with a simple three line interupt service routine one of thus lines dema...