Difference: ClicSigDigi (2 vs. 3)

Revision 317 Aug 2012 - FrancisCullinan

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Digitiser Effects

In order to investigate the effect of the digitiser specifications, the noise and non-linearities of the electronics were removed. This allowed the limits imposed on the resolution by the digitiser noise to be determined. A simulation was run with the same parameters as in ClicSigProc but with a position sweep in x with a single train at each point so that the minimum resolution of the digitiser is visible. The minimum offset visible above the digitiser noise was also determined. This came to 170 nm and is the same for both deconvolution and DDC processing algorithms. The bandwidth of the digital filter used for the DDC was 45 MHz in both cases.

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  digires.png
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Timing

The timing of the single bunch waveform used for the deconvolution was varied between 20 ns before the start of the multibunch waveform up to 30 ns after. It can be seen that the start time of the deconvolved waveform that is shown in the plot in the left is at t0,deconvolved=t0,multibunch-t0,single. When this goes negative, the deconvolved waveform rolls round to the end of the window. Therefore, it is desired that the arrival time of the single bunch waveform is earlier than the arrival time of the multibunch waveform.

decontiming.png digires2.png

 
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META FILEATTACHMENT attachment="digisweep.png" attr="h" comment="" date="1344943677" name="digisweep.png" path="digisweep.png" size="43595" stream="digisweep.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="digires.png" attr="h" comment="" date="1344943692" name="digires.png" path="digires.png" size="43168" stream="digires.png" user="Public.FrancisCullinan" version="1"
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META FILEATTACHMENT attachment="decontiming.png" attr="h" comment="" date="1345215778" name="decontiming.png" path="decontiming.png" size="24360" stream="decontiming.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="digires2.png" attr="h" comment="" date="1345215793" name="digires2.png" path="digires2.png" size="35492" stream="digires2.png" user="Public.FrancisCullinan" version="1"
 
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