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tuning_the_s800_xdt [2015/10/21 14:05]
pereira 		tuning_the_s800_xdt [2015/10/21 16:50]
pereira [Unreacted beam]
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   * Adjust MCFD threshold:   * Adjust MCFD threshold:
 +      * Open configuration file **MCFD16.tcl** in **/user/s800/operations/daq/usb/Configs** 
       * The OBJ signal feeding this module is not patched out to data U6       * The OBJ signal feeding this module is not patched out to data U6
       * The OBJ signal from MCFD-16 module goes to the Mesytec MTDC32 module and scaler (channel OBJ.MCFD.Scint)        * The OBJ signal from MCFD-16 module goes to the Mesytec MTDC32 module and scaler (channel OBJ.MCFD.Scint) 
-      * Adjust CFD threshold looking at scalers. The ratio of OBJ to XFP scaler rates (channels OBJ.MCFD.Scint and XFP.MCFD.Scint) should reflect the transmission of the cocktail beam  +      * Make sure that the threshold of the XFP MCFD channel is reasonable. Rates in scaler channels XFP.Scint and XFP.MCFD.Scint should be comparable 
 +      * Adjust MCFD OBJ threshold looking at scalers. The ratio of OBJ to XFP scaler rates (channels OBJ.MCFD.Scint and XFP.MCFD.Scint) should reflect the transmission of the cocktail beam         
 +      * Save new threshold in configuration file **MCFD16.tcl** 
        
  
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           * Width of beam peak is proportional to A1900 p-acceptance in focus optics           * Width of beam peak is proportional to A1900 p-acceptance in focus optics
           * Width is narrower in match optics            * Width is narrower in match optics 
-          * Adjust anode HV to bring fuzzy maximum to around 600-700 channels (the ADC for each pad saturates at 1000 ch)+          * Adjust anode HV to bring fuzzy maximum to around 600-700 channels (saturation of each pad at ~ 1000 ch)
  
       * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** (top and middle spectra in the second column)       * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** (top and middle spectra in the second column)
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       * Spectra **crdc1.xg** and **crdc2.xg** (bottom spectra in first and second columns)       * Spectra **crdc1.xg** and **crdc2.xg** (bottom spectra in first and second columns)
-          * It shows the position of the beam in the dispersive direction, evaluated by calculating the "center of gravity" +          * It shows the position of the beam in the dispersive direction, evaluated by calculating the "center of gravity". The peak should be in the middle of the spectra in order to center the beam 
  
       * Spectra **crdc1.tac** and **crdc2.tac** (bottom spectra in third and fourth columns)       * Spectra **crdc1.tac** and **crdc2.tac** (bottom spectra in third and fourth columns)
-          * They correspond to the non-dispersive position of the beam in the CRDCs. The peak should be in the middle of the spectra in order to center the beam +          * They correspond to the non-dispersive position of the beam in the CRDCs. 
  
 {{:wiki:CRDCS-example.png?850|CRDCs summary spectra}} {{:wiki:CRDCS-example.png?850|CRDCs summary spectra}}
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 === Timing setup === === Timing setup ===
 +
 +rview:
 +
 +  * There are three electronic "sources" with time information for ToF calculation: Tennelec TACs, Phillips TDC, and Mesytec MTDC. Although the "start" signal in these three sources is given by E1 up, the electronic path from the detector to the module is different
 +  * MTDC:
 +      * The OBJ and XFP signals comes from the MCFD module
 +      * The OBJ signal into the MCFD comes from the detector via S3 patch panel #94 (going to the target area) 
 +      * The XFP signal into the MCFD module comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD XFP output in data U6
 +      * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide 
 +  * Tennelec TACs:
 +      * The OBJ and XFP signals do not go through the MCFD module
 +      * The OBJ stop signal comes from data-U6 patch panel #62, which is connected to the CANBERRA 454 CFD OBJ output in data U6. The corresponding CFD input is connected to data-U6 patch panel #54
 +
 +      * The XFP stop signal comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD OBJ output in data U6. The corresponding CFD input receives the signal via patch panel to data U1
 +
 +
 +      * 
 +      * the detector via S3 patch panel #94 (going to the target area) 
 +      * The XFP signal into the MCFD module comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD output in data U6
 +      * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide 
 +
 +
 +
 +  * Phillips TDC:
 +      * The OBJ and XFP signals do not go through the MCFD module
 +      * The OBJ stop signal comes from data-U6 patch panel #67.
 +      *  
 +      * The XFP signal into the MCFD module comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD output in data U6
 +
 +      * The full range of the TACs and Phillips TDC is ~400 ns
 +      * 
  
   * See [[http://groups.nscl.msu.edu/s800/Technical/Electronics/Electronics_frameset.htm]] for background information on the trigger setup   * See [[http://groups.nscl.msu.edu/s800/Technical/Electronics/Electronics_frameset.htm]] for background information on the trigger setup
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj

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