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--- tuning_the_s800_xdt [2015/10/26 12:41]
pereira [Timing setup]
+++ tuning_the_s800_xdt [2015/10/26 13:57]
pereira [Checking Particle ID and rate at S800 FP]
@@ Line 163: / Line 163: @@
   * Select SpecTcl window **S800_TOF.win**
-      * The three columns correspond to the RF-FP ToF (left), OBJ-FP (center), and XFP-FP (right)
+      * The three columns correspond to the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right)
       * The first (top) row corresponds to the Phillips TDC
       * The second row corresponds to the MTDC with all the hits included
       * The third row corresponds to the MTDC with only the first hit
-      * The fourth row corresponds to the ORTEC TACs. Note that there is not RF-FP TAC
+      * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC**
       * 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). In an unreacted setting, one expects to see the most of the "good" ToF peak recorded in the first hit
       * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow
@@ Line 174: / Line 174: @@
 {{:wiki:SpecTcl-e14019-run103.jpg?850|S800_ToF.win page}}
-  * Adjust delays for
+  * If necessary, adjust delays:
-  *
+      * Using the [[S800 DAQ tools#Trigger GUI|ULM trigger GUI]] assign TDC-start to one of the Inspect Trigger channels and trigger the scope with it
-  *
+      * Select the timing signals (Delay inspect channels) E1 up, OBJ and XFP with the [[S800 DAQ tools#Delay Window|Delay GUI]] and look at them in the scope
-   * Phillips TDC:
+      * Adjust the TDC delays of OBJ and XFP using the delay boxes connected to the CANBERRA CFD 454 in data U6
+      * Adjust the TDC delays of E1 up, down using the Delay GUI
+      * In principle, the TACs delays don't need to be adjusted
+==== Checking Particle ID and rate at S800 FP ====
-  * See [[http://groups.nscl.msu.edu/s800/Technical/Electronics/Electronics_frameset.htm]] for background information on the trigger setup
+  * Select SpecTcl window **S800_PID.win** in directory **/user/s800/operations/spectcl/Windows**
+      * The three columns correspond to the PID determined with the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right)
-  * The TDC delays can only be changed when the run control is stopped; must SAVE settings before starting run control not to overwrite adjustments being made
+      * The first (top) row corresponds to the Phillips TDC
+      * The second row corresponds to the MTDC with just the first hit included
-  * The “S800” trigger is from E1 up signal
+      * The third row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC**
+      * You might need to adjust the limits of the spectra to get a good resolution
-  * Trigger the scope with the “Live Trigger” signal patched to data-U6
-      * There are 4 trigger inspect channels patched to data-U6 that can be assigned using the trigger GUI
-  * Examine the timing of each of the selectable listed signals with respect to the “Live Trigger” signal
-      * There are 4 TDC inspect channels patched to data-U6 that can be assigned using the trigger GUI
-      * The full range of the TDC is 400 ns
-      * Set each timing to 200 ns
-          * TDCs of last 4 listed signals (including XF and object scintillators) are bypassed with cable delays inside the vault and thus their delays cannot be controlled with the GUI
-          * They can be inspected, however using the GUI
-  * Information
-      * The signal delays controlled by the GUI (and not by cable delays) are not “pipelined” -– i.e., any new signals that arrive during the delay time of a previous signal are lost and thus deadtime is introduced into the system.  The signals delayed passively by cables are “pipelined” and thus are not subject to deadtime losses
-      * All of the trigger signals are not pipelined and are thus subject to deadtime
-==== Checking Particle ID and rate at S800 FP ====
-  * Establish PID
-      * Refer to information on setting from A1900 FP
-      * dE-TOF
-           * dE signal from Ion Chamber
-           * TOF from XF or Object scintillator to S800 FP
-           * Not necessary to implement dE- or TOF-based corrections
-      * Document rate of fragment of interest with run to disk
-          * Measure beam current with appropriate Faraday cups
-          * Timed run
+{{:wiki:SpecTcl-e14019-PID-r103.jpg?850|S800_PID.win page}}
+  * Establish PID and measure rate
+      * Determine the blob that corresponds to the unreacted beam (refer to information on setting from A1900 FP)
+      * Take gates around the fragment of interest
+      * Measure the beam intensity the appropriate faraday cup
+      * Take a run on disk
+      * Measure the beam intensity again and calculate the average value
+      * In **[[s800 SpecTcl|SpecTcl GUI]], click **Attach to File** and select data file **run-xxxx-xx.evt** in directory **/user/s800/stagearea/experiment/runxxxx**, where xxxx stands for the run number
+      * Check the run time and live time from the corresponding scaler file in directory **/user/s800/converged_daq/scalers**
+      * Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission
 ==== Analysis line classic PPAC setup (Focus optics only) ====
   * "Classic" PPACs are the default detector, not TPPACs or CRDCs

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