Search found 1694 matches

by Steven Sesselmann
Thu Feb 28, 2019 10:59 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 12
Views: 6043

Re: Collection of information about russian SNM tubes

Lukas, As you know the specs are all in Russian and if I recall correctly only lists background or self count. My estimate for the efficiency of the SNM-12 tube is based on some tests I did at the University of Sydney with an AmBe neutron source said to emit around 2x10^6. Tests were done with a 90 ...
by Steven Sesselmann
Thu Feb 28, 2019 12:09 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 12
Views: 6043

Re: Collection of information about russian SNM tubes

Hi Guys, Just a reminder that David Housley and myself developed this little board for the Russian Corona counters, specifically the SNM-12 (CHM-12) and similar tubes. It's a schmidt trigger circuit and turns the noisy signal into a nice flat baseline with strong pulses. It can operate on a 9V batte...
by Steven Sesselmann
Thu Jan 31, 2019 12:48 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 11631

Re: Spectrum Recorder PCI-E Card?

Steven, is there a turn key solution for pulse stretching? What I use is just a fast rail to rail opamp as a current amplifier with a high impedance drain, so when a pulse comes in via the coupling, it takes time to filter through. Obviously this only works when the pulse count rate is slow, otherw...
by Steven Sesselmann
Wed Jan 30, 2019 3:36 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 11631

Re: Spectrum Recorder PCI-E Card?

Meanwhile I have figured out, that the signal amplitude of a (negative voltage) scintillation tube typically is in the range of ~20 mV with a pulse length of ~20 ns. What exactly are you trying to achieve with GHz sampling? Can you amplify and stretch the pulse so you can sample at a lower rate? Th...
by Steven Sesselmann
Mon Jan 28, 2019 11:38 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spectrum Recorder PCI-E Card?
Replies: 39
Views: 11631

Re: Spectrum Recorder PCI-E Card?

Hello Harald,

At the recent IEEE in Sydney I was talking with one of the exhibitors from Hawaii who explained that they design and make ADC's with Giga Bit sampling, might be something.

http://www.naluscientific.com


Steven
by Steven Sesselmann
Fri Jan 25, 2019 3:19 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 37
Views: 12255

Re: F.I.C.S Fusion Runs

Joe,

Let me record some data over the weekend and get back to you on that question..

Steven
by Steven Sesselmann
Thu Jan 24, 2019 10:58 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 37
Views: 12255

Re: F.I.C.S Fusion Runs

Patrick, Thanks for comments. It is sometimes easy to point out the weaknesses in other peoples systems, while forgetting that those persons have worked tirelessly for years, on limited budgets and made many mistakes along the way. The path to break even fusion is not known, so we try to remain pure...
by Steven Sesselmann
Thu Jan 24, 2019 3:29 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 37
Views: 12255

Re: F.I.C.S Fusion Runs

Joe, Well spotted, should be an interesting read. I intend to do an experiment with a number of CR39 dosimeters placed at various positions around my reactor, this should not only close the debate on isotropic emission but also give me a better number on efficiency. There is absolutely no reason for...
by Steven Sesselmann
Thu Jan 24, 2019 2:13 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 37
Views: 12255

Re: F.I.C.S Fusion Runs

Joe, Disagree if you like, but consider this... We are setting up a unique plasma condition, offering deuterons an opportunity to fuse, where the opportunity is favourable in the axial direction by around 50 kV, then we let nature be the boss. To me it is not at all a surprise when nature takes the ...
by Steven Sesselmann
Thu Jan 24, 2019 1:31 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 37
Views: 12255

Re: F.I.C.S Fusion Runs

Joe, Yes of course..., Newtons third law right? "For every action there is an equal and opposite reaction" If the alpha particle/proton can only go to ground via the tube, then the neutron can only go in the opposite direction right? This is all pretty obvious now, but it has taken me since 2005 to ...