Search found 1697 matches

by Steven Sesselmann
Wed Oct 30, 2019 6:21 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 13
Views: 7405

Re: Collection of information about russian SNM tubes

I've got a question for you, steven: You spec your GS-NEUTRON-150 as 15% efficiency, is that with the moderator in a fast neutron field or just a spec for the tube and thermal neutrons? Lukas Lucas, I have an update on the efficiency numbers for the SNM-12. I built a GS-NEUTRON for a client and had...
by Steven Sesselmann
Wed Oct 30, 2019 6:08 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: F.I.C.S Fusion Runs
Replies: 40
Views: 13443

Re: F.I.C.S Fusion Runs

Hi Richard, Long time no speak... My fusion reactor has been in storage since last February as we are building ourselves a new house, in the mean time we are renting a house in the same street, so instead of explaining to the landlord why I have a fusion reactor in the garage, I decided to just cove...
by Steven Sesselmann
Fri Oct 04, 2019 12:54 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Diy Neutron detector tube
Replies: 11
Views: 1003

Re: Diy Neutron detector tube

Sam,

Well done, 10/10 for attempting to roll your own tube. Hope it works on the first attempt, but if not try try again..

What are you using as an anode wire inside, how thick is it and how did you prepared it?

One day I might try doing this myself.

Steven
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: 13
Views: 7405

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: 13
Views: 7405

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: 13836

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: 13836

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: 13836

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: 40
Views: 13443

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: 40
Views: 13443

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...