Dear all,
I asked for your advice about amplifiers for MCP detectors this summer.
I had many answers (thanks a lot!) and many of you asked to post the
results.
ORTEC preamplifiers seem to be the best solution for our application.
The ratio quality/price is quite good (compared to SRS for example) and
they have the advantage of being quite small which makes it possible to
connect them on top of our TOF mass spectrometer directly at the MCP
output e not amplifying any noise picked up in the cables).
I have chosen the model 9326 which is perfect for the kind of signal we
have (the mass peaks are about 20ns wide FWHM). If your signal are
faster (few ns or less) the model VT120A/B/C will be more adapted. Their
main drawback is that they are meant to be powered via ORTEC amplifiers
but you can easily make yourself the power supply as they required only
12V (with less than 3mV ripple) and 100mA (9326) or 50mA (VT120A/B/C).
The model 9326 provides a 5, 10 or 20 times non inverting amplification
(set by a jumper in the preamp - very easy to do) and the VT120 provide
either 20 times non inverting (VT120C), 200 times inverting (VT120B) or
200 times non inverting (VT120A).
Greetings,
piR
--
Pierre Çarçabal
University of Oxford
Physical and Theoretical Chemistry Laboratory
South Parks Road
Oxford OX1 3QZ
phone : +44 (0)1865 275 469 (office)
+44 (0)1865 275 447 (lab)
fax : +44 (0)1865 275 410
e.mail: [log in to unmask]
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