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Advice needed.. PMT

Discussion in 'Electronic Basics' started by jack, Aug 29, 2003.

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  1. jack

    jack Guest

    I'm working on a project now where I want to observe dark current
    pulses on a PMT. The output from a PMT can be considered a almost pure
    current source ( I've read) and I'm trying to figure out the best
    electronics to put between the anode and my scope. I'm configuring the
    tube as pulse mode to be used with a scintillator,so I have it as
    cathode grounded, and for starters I have a coupling capacitor just
    after the anode output. OK, several questions...
    Do I need a preamp or should I go straight into an op amp and if so
    what op amp is best? From my meager knowledge i have read a
    transimpedence op amp may be what I'm looking for as it takes a
    current and converts to voltage, and has the advantage of high slew
    rates which I like as these current pulses are in the 5 to 20 ns
    range. Before I go further with a scintillator,I would like to
    understand the nature of noise in these tubes and would like to build
    the electronics to do this. I have read the Hamamatsu handbook on this
    but in my opinion they did not give as much attention to pulse mode
    electronics as they did analogue operation. Does anyone have any
    experience with this or any suggestions? Any help would be
    appreciated. jack
  2. Dana Raymond

    Dana Raymond Guest

    I know this isn't what you asked about... Just wanted to throw in my 2

    Many PMT tube manufacurers have amplifier assemblies available for purchase
    (also power supplies, RS232 readout converters, etc).

    Just in case this is a one off and you are willing to Buy instead of Build!

    Dana Frank Raymond
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