Differences

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--- tuning_the_s800_xdt [2015/10/29 10:48]
pereira [Timing setup]
+++ tuning_the_s800_xdt [2015/10/29 11:26]
pereira [Timing setup]
@@ Line 182: / Line 182: @@
       * Adjust the TDC delays of E1 up, down using the Delay GUI
       * In principle, the TACs delays don't need to be adjusted
+  * Due to the MTDC has multi-hit capabilities. Let's assume that
+  * Now Let's imagine a situation where the rate from OBJ detector is much higher than from the FP detector. During this window, the MTDC will record one hit from the FP scintillator (which SpecTcl uses as the start ToF reference) and multiple hits from the OBJ scintillator (stops). As a results, we will have a series of OBJ-FP ToFs.
+  * Each of the ToFs from the MTDC has an array of parameters. For instance, for the OBJ-FP ToF, SpecTcl assigns an array of parameters s800.fp.vmetdc.obj.i, where i=0 stands for the first hit, i=2 second hit and so on.
+  * In an unreacted-beam setting at moderate rates, the first hit i=0 does typically correspond to the good ToF (start and stop come from the same event, as shown in the summary spectra above)
+  * This is not the case in a typical reaction setting, where there is a chance that earliest ToF hits

S800 Documentation