Hello
I am trying to make a digital positron lifetime setup. For that one needs a fast digitizer with high GS/s and bandwidth (preferably in GHz). what will be the best digitizer card to make this setup? CAEN has a digitizer NIM module (model number- N6751) which gives 2GS/s for 2 channels and 500 MHz. Its based on the board from Paul Scherrer Institute (i think!). The other cards mentioned in the literature seem to be out of production now, especially the Acqiris ones. THere is one from GaGe (http://www.gage-applied.com/digitizers/12-bit/pcie/digitizer-compuscope-eon-express.htm) which seems to be slightly better then CAEN but the price is three times ($15k, while CAEN one is ~5k). So please let me know if there is a good card out there.
thank you in advance
It is convenient, in my opinion, to try digital oscilloscopes, LeCroy Wavepro 960 or Wavepro 950.
Reportedly, There is no difference in the time resolution between the two types of the oscilloscope.
They are quite costly, my brotha! If I remember correctly, lecroy Wavepro (i forgot the model number) was ~ $20k in 2009. If you are using it, how much did you pay for it? I do plan to buy a fast scope but not just now.
Choosing between CAEN and GaGe I would go with CAEN. The main reason for this is that I have only dealt with CAEN, but the dealings I have had with them have been good. We use their digitizer for new detector development and they helped us a great deal, even giving some support to our group in writing a custom firmware for the FPGA in the digitizer. As I said before, I have not dealt with GaGe so I do not know much about them; however, another alternative that you may have overlooked is XIA. A couple of the other research groups here use them and have had good results. (For instance MTAS (Modular Total Absorption Spectrometer) uses XIA Pixie digitizers and they have had few problems.)
Below is a link to the XIA products.
Sorry I cannot help discriminate between the two any more than that.
http://www.xia.com/products.html
Thanks for the info, James. I think I will go with the CAEN one. I am hearing lot of good things about them. The XIA might be tad slower then CAEN. They show timing resolution of ~ 40 ps with LaBr3 scintillator (one detector output , split into two---one arm delayed --- timing measured between the two arms).
We performed some tests to optimize our PALS system and we found that a 10 bit DC 252 digitizer working at 2 or 4 GS/s has a very nice resolution and it can detect too fast signals very well. With its own low pass filter or even with 500MHZ or 1GHZ external filters, the change in the resolution was not too much, a few ps only.
Thank you Ahmed. I think this model is discontinued. Do you have any alternative.
thank you
saurabh
you need a fast digitizer for direct sampling from preamplifier because in PALS technique timing resolution should be less than 400ps. I suggest you a 2GHz CAEN DIGITIZER. it is noteworthy that it is so expensive!
for more information you can conduct:www.caen.it
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