TRestDetectorSignalToRawSignalProcess adding optional noise process

[mariajmz]

Adding optional noise process before and after the shaping process. For the moment, it applies the same noiseLevel before and after the shaping.

To use it, in the rml the user must specify noiseLevel for each type of signal tpc noiseLevelTpc and/or veto noiseLevelVeto. Here we show an example of the rml section:

<addProcess type="TRestDetectorSignalToRawSignalProcess" name="DetectorSignalToRaw" value="ON">   
            <parameter name="nPoints" value="512"/>
            <parameter name="triggerMode" value="integralThresholdTPC"/>
            <parameter name="triggerDelay" value="127"/>
            <parameter name="integralThresholdTPCkeV" value="0.1"/>
            <observable name="triggerTimeTPC" value="ON"/>
            <parameter name="readoutTypes" value="tpc,veto"/>

            <parameter name="samplingTpc" value="20ns"/>
            <parameter name="shapingTimeTpc" value="1200ns"/> 
            <parameter name="noiseLevelTpc" value="10"/>
            <parameter name="calibrationEnergyTpc" value="(0,1.83)keV"/>        
            <parameter name="calibrationRangeTpc" value="(0.05,0.5)"/>

            <parameter name="samplingVeto" value="500ns"/>
            <parameter name="shapingTimeVeto" value="3000ns"/> 
            <parameter name="noiseLevelVeto" value="5"/>
            <parameter name="calibrationEnergyVeto" value="(0,10)MeV"/>
            <parameter name="calibrationRangeVeto" value="(0.05,0.50)"/>
</addProcess>

For example, for a signal induced by an xray of 5.9keV:

The signal processed with noiseLevelTpc = 10 is:

And, with noiseLevelTpc= 50 is: