Search found 28 matches

by Lukas Springer
Wed Feb 27, 2019 7:01 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 13
Views: 7817

Re: Collection of information about russian SNM tubes

There is no corona noise, that is true, but gamma peaks get huge. With some corona current gamma rejection becomes really easy, since all gamma events are drowned out in the noise and only neutron events get above it. Setting your disc to ~1.5 times the voltage of your noise pretty much garantees yo...
by Lukas Springer
Wed Feb 27, 2019 4:49 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 13
Views: 7817

Re: Collection of information about russian SNM tubes

From ~2/3 of the corona ignition voltage to the ignition voltage it is in that "prop mode" region, being very responsive to gamma.
What do you want to achive with running it below its nominal voltage?
Maybe I can test for that.
by Lukas Springer
Wed Feb 27, 2019 11:44 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 13
Views: 7817

Re: Collection of information about russian SNM tubes

I finally got around collecting the data, here are my results: My setup was: Canberra 3106D HVPS HP 5554A charge sensitive preamp (47M Bias Resistor) Canberra 2031 SCA NM 172 Ratemeter Rigol DS1054z Oscilloscope Amersham Buchler 3.7 GBq AmBe source, ~2.2E5 n/s One SNM-18-1 4.6 Bar He3 Corona tube Tw...
by Lukas Springer
Tue Feb 26, 2019 8:27 am
Forum: Announcements and Site Administration Topics
Topic: The Occasional Fusor.net Fund Raiser - 2019 Edition
Replies: 16
Views: 6661

Re: The Occasional Fusor.net Fund Raiser - 2019 Edition

For some reason I get an error after entering everything in the paypal link above, but the one on the front page works.
by Lukas Springer
Wed Feb 20, 2019 10:09 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: SNM-11/СНМ-11 Tube - Again ...
Replies: 12
Views: 6277

Re: SNM-11/СНМ-11 Tube - Again ...

I'd be interested in doing a FAQ, since this is kinda what I tried to do with this thread: https://www.fusor.net/board/viewtopic.php?f=13&t=12474 I will collect more data tomorrow, write up something and post it here, but that might take a while, since I've got a lot of exams right now. Peter, I kno...
by Lukas Springer
Tue Feb 19, 2019 3:59 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: SNM-11/СНМ-11 Tube - Again ...
Replies: 12
Views: 6277

Re: SNM-11/СНМ-11 Tube - Again ...

They have some U ore samples with a couple hundred µSv/h, I hope that is enough to test gamma rejection. I attached the (simplified) datasheet for the SNM-11, where it states that corona ignition voltage is no more than 700 V and working voltage is 1600 V. What do you mean your preamp noise was 15 k...
by Lukas Springer
Mon Feb 18, 2019 10:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: SNM-11/СНМ-11 Tube - Again ...
Replies: 12
Views: 6277

Re: SNM-11/СНМ-11 Tube - Again ...

I can compara my two SNM-11 to see if there's any difference in ignition voltage, pulse amplitude, etc. What do you mean by "a very hot U source"? Very high input voltage to the fusor? I have not seen any kind of sweet spot on my tubes, quite the opposite; they seem to be very constant in their outp...
by Lukas Springer
Mon Feb 18, 2019 10:11 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: SNM-11/СНМ-11 Tube - Again ...
Replies: 12
Views: 6277

Re: SNM-11/СНМ-11 Tube - Again ...

I have two SNM-11 here and will get a good neutron source next thursday, do you want me to test anything specific? Just below the corona ignition point is the proportional region, where you don't get any corona noise, but also lower gas multiplication and most importantly a less stable multiplicatio...
by Lukas Springer
Mon Feb 18, 2019 9:41 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 13
Views: 7817

Re: Collection of information about russian SNM tubes

Next thursday I'm getting access to a decent neutron source, to test the detectors properly. Right now I have 1 SNM-18-1 He3 and 2 SNM-11 B10 tubes. I will try to measure their efficiency, gamma rejection, if they can be used in the proportional region, etc. Is there anything you want to be tested? ...
by Lukas Springer
Mon Oct 22, 2018 5:42 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: LENR / Solid State Fusor
Replies: 12
Views: 6992

Re: LENR / Solid State Fusor

Just look up "Beam on Target Fusion"