Re: New He3 4Atm Tubes available

This area is for discussions involving any fusion related radiation metrology issues. Neutrons are the key signature of fusion, but other radiations are of interest to the amateur fusioneer as well.
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MARK-HARRISS
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Re: New He3 4Atm Tubes available

Post by MARK-HARRISS »

I'm interested!, sounds good.
Richard Hester
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Re: New He3 4Atm Tubes available

Post by Richard Hester »

I would assume a charge amp feedback capacitor of 1pf. This gives you a gain of 1V/picocoulomb. The value is also pretty standard. For example, it's used in the Ortec 107, a good old workhorse charge amp.
DaveC
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Re: New He3 4Atm Tubes available

Post by DaveC »

Geo -

I don't understand about the additional information your supplier needs. It would seem to me that a specific tube geometry, diameter, length and fill pressure, will generate a specific size charge pulse for a given type (energy) of detected event.

Is he seeking is some idea what source equivalent circuit is assumed in a commonly used charge sensitive detector?

From where I sit, a 1 pC discharge would be rather large, but a 1 pF feedback capacitance would allow perhaps fC detection levels, which seems pretty nice.

Dave Cooper.
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