Search found 1391 matches

by Dennis P Brown
Sat Jan 20, 2018 12:33 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Voltage multiplier help
Replies: 4
Views: 135

Re: Voltage multiplier help

A neon sign transformer (NST) will not work for a fusor grade (read detectable neutrons) voltage multiplier - NST units are designed for 60 Hz and to supply only an initial surge current and rather low sustained/continuous current. Read Richard's excellent studies on this very subject! Also, do read...
by Dennis P Brown
Fri Jan 19, 2018 2:27 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: New pulsotron production line
Replies: 6
Views: 176

Re: New pulsotron production line

Do remember that there is one born every minute and this guy, for what ever reason, is looking for one of those. By the way, I can build a warp drive star ship - no problem. Believe me? If so, I also have a bridge in New York city for sale - cheap, too. I'll throw in a warp drive engine (sorry, no s...
by Dennis P Brown
Thu Jan 18, 2018 5:33 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Neutron temperature
Replies: 5
Views: 155

Re: Neutron temperature

Not sure what you mean since I have never seen temperature really used to qualify the energy of a neutron. While the term "thermal" is used for a class of neutron energies (under some arbitrarily defined number in eV), eV is still the unit used to define any such energy; for instance, a 'room temper...
by Dennis P Brown
Thu Jan 18, 2018 5:22 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: A Bunch of Successes
Replies: 2
Views: 152

Re: A Bunch of Successes

Very glad to hear. Onward towards a fusor.
by Dennis P Brown
Tue Jan 16, 2018 1:51 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: A Bunch of Failures
Replies: 46
Views: 1279

Re: A Bunch of Failures

In a previous post you said: Note: I had filled the pump up to the max marking. I lost this much oil after 1hr 10mins of combined run time (two 20 minute runs and one 30 minute run). Is this normal? No, that is not normal! No way that much oil should be lost even if the ballast is open. I have used ...
by Dennis P Brown
Sat Jan 13, 2018 11:44 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: A Bunch of Failures
Replies: 46
Views: 1279

Re: A Bunch of Failures

Are you just pumping on the vacuum gauge? A decent pump will never pull just 500 microns; either you have a massive leak - i.e. a bad o-ring or non-vacuum tight connection between the gauge and pump body (Also, have you tried listening for a leak?) or water in the pump (so Bruce's advice will help t...
by Dennis P Brown
Thu Jan 11, 2018 2:05 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Ludlum 12 Ratemeter Issues
Replies: 10
Views: 373

Re: Ludlum 12 Ratemeter Issues

My unit had a few issues being old and having had corrosion issues. The later problem is not your issue here. Did you ohm the cable and cable & unit to confirm no grounding issues with the high voltage side of the unit/cable? That can be an issue - also, make certain the high voltage line in the uni...
by Dennis P Brown
Wed Jan 10, 2018 5:00 pm
Forum: Vacuum Technology (& FAQs)
Topic: Question About Design Trade-offs for Backing Pumps
Replies: 20
Views: 506

Re: Question About Design Trade-offs for Backing Pumps

If you are hoping to use a diffusion pump without a real cold trap your system might not get below 10^-6 torr. Worse, the oil vapor back flow from the DP will contaminate the system even if you gate the DP off after reaching low enough for the ion pump to start. You might need a dry ice/alcohol or s...
by Dennis P Brown
Tue Jan 09, 2018 11:16 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: A Bunch of Failures
Replies: 46
Views: 1279

Re: A Bunch of Failures

As long as you are prepared to properly clean out the pump - remember, that is no simple task to really remove the wrong oil if its vapor pressure may be a future issue - then fine. The oil will provide the pump lubrication to enable you top test its operation. However, might be easier in the long r...
by Dennis P Brown
Mon Jan 08, 2018 10:39 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: A Bunch of Failures
Replies: 46
Views: 1279

Re: A Bunch of Failures

While 500 microns is terrible for a good pump, that it had little oil can explain that figure but also, an excellent way to destroy the pump. Always fill the pump to the correct level before operation.