Search found 1349 matches

by John Futter
Thu Feb 07, 2019 2:15 am
Forum: Announcements and Site Administration Topics
Topic: Fusor.net maintenance
Replies: 8
Views: 562

Re: Fusor.net maintenance

High Guys thanks for the effort

a question
When are we going to upgrade to HTTPS
modern operating systems label the site as insecure
And I no longer have access at work due to the site not being HTTPS
by John Futter
Sat Feb 02, 2019 8:08 pm
Forum: The Trading Post
Topic: What kind of connector is this?
Replies: 6
Views: 607

Re: What kind of connector is this?

Looks like a LEMO connector

Try RS components Circular connecotrs
by John Futter
Sat Feb 02, 2019 8:05 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 2134

Re: Spectrum Recorder PCI-E Card?

Again
What Harald wants to do is exactly what an MCA does-- pulse height into bins
and no a computer or microcontroler is not the way to go if you want to count fast
I have already given the answer
by John Futter
Tue Jan 29, 2019 3:12 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 2134

Re: Spectrum Recorder PCI-E Card?

As Steven has pointed out yet another offering using gate arrays to get gigabit equivalent input
And looking at thier enduse I would say they are eye wateringly expensive almost custom tfor the LHC
by John Futter
Mon Jan 28, 2019 6:14 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 2134

Re: Spectrum Recorder PCI-E Card?

Harald this is the bane of nuclear physics cured by backing away to keep deadtime very low - inverse square law (deadtime = rejected counts due to two or more arriving within the integration time) You can also use differing scintillators that are much faster in decay time so shaping time is coresspo...
by John Futter
Wed Jan 23, 2019 1:43 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 37
Views: 5846

Re: F.I.C.S Fusion Runs

Patrick I introduced Steven to making these high voltage zeners from Transil diodes These diodes exhibit extremely low leakage ie femtoamps so they can be used for self biased electrodes (such as secondary electron suppression and einzel lenses) and i have been using them for 15 years to provide the...
by John Futter
Wed Jan 23, 2019 1:36 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Institutional Quackery
Replies: 11
Views: 1142

Re: Institutional Quackery

I replied to this thread yesterday but it dissappeared down the dark hole field emmission as you have pointed out is limited by the munber of emmiters per square area you have to satisfy the Fowler Norheim conditions for it to happen you are doing well a few mA per sq cm emmiter surface. Negative io...
by John Futter
Tue Jan 22, 2019 4:01 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 45
Views: 2943

Re: Construction of Neutron Grade Fusor

Enzo the clue is in your x-ray graph of voltage vs dose it is your view port ie silicon and or some aluminium somewhere ie ceramic insulator for your high voltage all very good leak sites at about 20-30kV, Stainless holds back until 50kV or more do not assume that the x-rays follow striaght lines th...
by John Futter
Fri Jan 18, 2019 6:35 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 38
Views: 2386

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

I personally would never use labview for any real time application for a start it sits atop a non real time operating system. Getting reliable data in real time keeps many experts very busy one very good example is http://www.coultersmithing.com/forums/viewtopic.php?f=13&t=640 One place real time da...
by John Futter
Thu Jan 17, 2019 5:53 am
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 24
Views: 1561

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

Ive bought these connectors off RS components not cheap but they are there in 5 days from order and what use are these supplies bias supply for detectors, ion focusing ie einzel lens, secondary electron suppression and a stopper of car antenna benders --did this many years ago every friday night all...