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Hello all,
This is my first post on this forum.
I've just built a gamma scintillation detector using a plastic scintillator and a Fairchild / Dumont 2750 photomultiplier tube. I'm using 4M7 resistors between each dynode, and a few 10n caps on the last few dynodes as to keep the voltage from dropping too much during pulses.
Everything seems to be working fine, but I'm just wondering if anybody has any knowledge about these PMTs, and knows if, maybe, the 1:1:1:1... divider is actually the most effective way of driving this PMT, or if maybe the PMT prefers a higher/different voltage between certain points (like, cathose -> first dynode or last dynode -> anode). I could find very little technical information about this particular tube, although it seems that they still sell on ebay.
I've been driving the total chain around 900-1100 volt because, below that there's very little gain and, above it the tube gets very noisy.
Hoping there's someone out there with a bit more experience on these beasts
Thanks in advance!
Regards,
Tom
This is my first post on this forum.
I've just built a gamma scintillation detector using a plastic scintillator and a Fairchild / Dumont 2750 photomultiplier tube. I'm using 4M7 resistors between each dynode, and a few 10n caps on the last few dynodes as to keep the voltage from dropping too much during pulses.
Everything seems to be working fine, but I'm just wondering if anybody has any knowledge about these PMTs, and knows if, maybe, the 1:1:1:1... divider is actually the most effective way of driving this PMT, or if maybe the PMT prefers a higher/different voltage between certain points (like, cathose -> first dynode or last dynode -> anode). I could find very little technical information about this particular tube, although it seems that they still sell on ebay.
I've been driving the total chain around 900-1100 volt because, below that there's very little gain and, above it the tube gets very noisy.
Hoping there's someone out there with a bit more experience on these beasts
Thanks in advance!
Regards,
Tom
