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tuning_the_s800_xdt [2015/10/29 13:25]
pereira [Checking Particle ID and rate at S800 FP] 		tuning_the_s800_xdt [2017/04/08 13:40]
pereira [FP scintillator setup]
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   * Set trigger to “s800 trigger”    * Set trigger to “s800 trigger” 
-      * Ensure that the **[[s800 daq tools#trigger GUI|trigger GUI]]** application is ready. Otherwise, open it by clicking button **[[s800 daq tools#Run Control Window|Launch ULM GUI]]** in ReadoutGUI +      * Ensure that the **[[s800 daq tools#trigger GUI|trigger GUI]]** application is ready. Otherwise, open it by clicking button **[[s800 daq tools#Run Control Window|Launch ULM GUI]]** in [[#ReadoutGUI|ReadoutGUI]] 
           * Under trigger tab select **s800 trigger** (which is E1 up by definition)           * Under trigger tab select **s800 trigger** (which is E1 up by definition)
           * Deselect experiment trigger           * Deselect experiment trigger
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           * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** to assert new trigger condition           * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** to assert new trigger condition
  
-  * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** in directory **/user/s800/operations/spectcl/s800v7/Windows**+  * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** in directory **/user/s800/operations/spectcl/s800v7/Windows**. (NOTE: Spectra definition files can be found in directory **/user/s800/operations/spectcl/s800v7/Definitions**. A good file with useful spectra is **s800xdt.tcl**) 
  
   * Adjust **[[hv bias|bias]]** looking at 2D spectra **e1.deup_e1.dedown** (showing the parameters s800.fp.e1.de_down vs. s800.fp.e1.de_up) for the FP E1 scintillator   * Adjust **[[hv bias|bias]]** looking at 2D spectra **e1.deup_e1.dedown** (showing the parameters s800.fp.e1.de_down vs. s800.fp.e1.de_up) for the FP E1 scintillator
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       * The two spectra in the fifth row corresponds to the MTDC summary spectra of OBJ-FP and XFP-FP ToFs (zoomed in). The spectra show the ToF (vertical axis) vs. hit number (horizontal axis). Note that in a unreacted-beam setting, the first hit typically provides the "good" ToF (i.e. start and stop signals come from the same event). This is not the case in a reaction setting, where the rates in the XFP and OBJ detectors are much higher than in the FP SCI        * The two spectra in the fifth row corresponds to the MTDC summary spectra of OBJ-FP and XFP-FP ToFs (zoomed in). The spectra show the ToF (vertical axis) vs. hit number (horizontal axis). Note that in a unreacted-beam setting, the first hit typically provides the "good" ToF (i.e. start and stop signals come from the same event). This is not the case in a reaction setting, where the rates in the XFP and OBJ detectors are much higher than in the FP SCI 
       * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow        * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow 
-      * The MTDC spectra should never be empty because the matching window is sufficiently wide (around 4000 ns)+      * The MTDC delays should never need to be adjusted because the matching window is sufficiently wide (around 4000 ns)
  
 {{:wiki:SpecTcl-e14019-run103.jpg?850|S800_ToF.win page}} {{:wiki:SpecTcl-e14019-run103.jpg?850|S800_ToF.win page}}
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       * Using the cursor mouse, check the lower and higher limits defining the region in the MTDC ToF spectra with the "good" ToF peak. Do it for the three ToFs: RF-FP, OBJ-FP, and XFP-FP       * Using the cursor mouse, check the lower and higher limits defining the region in the MTDC ToF spectra with the "good" ToF peak. Do it for the three ToFs: RF-FP, OBJ-FP, and XFP-FP
       * Go to the **Variables** page in SpecTcl GUI and assign the limits to the following variables:        * Go to the **Variables** page in SpecTcl GUI and assign the limits to the following variables: 
-              * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_rfhigh** for RF-XFP +              * **s800.fp.vmetdc.mtdc_rflow** and **s800.fp.vmetdc.mtdc_rfhigh** for RF-XFP 
-              * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_rfhigh** for OBJ-XFP+              * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_objhigh** for OBJ-XFP
               * **s800.fp.vmetdc.mtdc_xfplow** and **s800.fp.vmetdc.mtdc_xfphigh** for XFP-XFP               * **s800.fp.vmetdc.mtdc_xfplow** and **s800.fp.vmetdc.mtdc_xfphigh** for XFP-XFP
       * For each ToF, SpecTcl will search the hit number that fits in the selected region. The new MTDC ToF parameters are **s800.fp.vmetdc.mtdc_rf**, **s800.fp.vmetdc.mtdc_obj**, and **s800.fp.vmetdc.mtdc_xfp**        * For each ToF, SpecTcl will search the hit number that fits in the selected region. The new MTDC ToF parameters are **s800.fp.vmetdc.mtdc_rf**, **s800.fp.vmetdc.mtdc_obj**, and **s800.fp.vmetdc.mtdc_xfp** 
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       * Adjust the TDC delays of E1 up, down using the Delay GUI       * Adjust the TDC delays of E1 up, down using the Delay GUI
       * In principle, the TACs delays don't need to be adjusted       * In principle, the TACs delays don't need to be adjusted
 +
 +
 +  * Check the efficiencies of the Phillips TDC, TACs, and MTDC for the OBJ-FP and XFP-FP ToFs:
 +      * Make a gate on spectrum **IC.SUM** selecting the region of interest, and call it "IC"
 +      * Looking at the ToF spectra gated on "IC" compare the recorded events in the spectra with the number of events in the gate
 +      * The window file **S800_TOF_EFFICIENCY.win** includes all the spectra needed
 +
  
 ==== Checking Particle ID and rate at S800 FP ==== ==== Checking Particle ID and rate at S800 FP ====
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               * What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime)               * What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime)
           * Move blocker, decrease attenuator, repeat           * Move blocker, decrease attenuator, repeat
 +
 +      * If necessary, do the ToF corrections to improve the PID resolution (instructions [[During experiments#Particle identification corrections|here]])
  
  
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj

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