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tuning_the_s800_xdt [2015/10/26 13:21] pereira [Timing setup] |
tuning_the_s800_xdt [2015/10/26 14:04] pereira |
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* If necessary, adjust delays: | * If necessary, adjust delays: | ||
- | * Using ULM GUI assign TDC-start to one of the Inspect Trigger channels and trigger the scope with it | + | * Using the [[S800 DAQ tools# |
- | * Select the timing signals (Delay inspect channels) E1 up, OBJ and XFP with the Delay GUI and look at them in the scope | + | * 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 |
- | * Adjust the TDC delays of OBJ and XFP using the delay boxes connected to the CANBERRA CFD in data U6 | + | * 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 | * 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 | ||
+ | |||
==== Checking Particle ID and rate at S800 FP ==== | ==== Checking Particle ID and rate at S800 FP ==== | ||
- | | + | |
- | * Refer to information on setting from A1900 FP | + | * Select SpecTcl window **S800_PID.win** in directory **/ |
- | * dE-TOF | + | * The three columns correspond |
- | | + | * The first (top) row corresponds to the Phillips TDC |
- | | + | * The second row corresponds to the MTDC with just the first hit included |
- | | + | * The third row corresponds |
- | * Document | + | * You might need to adjust the limits of the spectra to get a good resolution |
- | * Measure beam current with appropriate Faraday cups | + | |
- | * Timed run | + | {{: |
+ | |||
+ | |||
+ | | ||
+ | * 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 | ||
+ | * In [[s800 SpecTcl|SpecTcl GUI]], click **Attach to File** and select data file **run-xxxx-xx.evt** in directory **/ | ||
+ | * Check the run time and live time from the corresponding scaler file in directory **/ | ||
+ | * Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission | ||
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==== Analysis line classic PPAC setup (Focus optics only) ==== | ==== Analysis line classic PPAC setup (Focus optics only) ==== | ||
+ | |||
* " | * " | ||
* Classic PPACs have rate limitations from pileups | * Classic PPACs have rate limitations from pileups | ||
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* Confirm correlations between dispersive angle at intermediate image and p in FP (e.g., crdc1x). This correlation will be somewhat washed out by straggling in the target; in principle, this should be checked without the target, but the benefit vs. cost in time to remove the target is not worth it. | * Confirm correlations between dispersive angle at intermediate image and p in FP (e.g., crdc1x). This correlation will be somewhat washed out by straggling in the target; in principle, this should be checked without the target, but the benefit vs. cost in time to remove the target is not worth it. | ||
- | |||
- | |||
- | ==== Setup beamline ==== | ||
- | * Object and XF scintillators and intermediate image PPACs inserted if they will be used | ||
- | * If Object scintillator will not be used, there is no reason to look at beam on it unless to debug a problem with the transmission | ||
- | |||
- | * Set spectrograph Brho for unreacted fragment | ||
- | |||
- | ==== Start scalers ==== | ||
- | * Use s800 account | ||
- | |||
- | * Make sure experiment daq is: | ||
- | * Stopped | ||
- | * Gone | ||
- | * Open terminal window (from bottom of mac) | ||
- | * ssh to spdaq20 | ||
- | * ps auw | grep Readout | ||
- | * Does not get restarted | ||
- | |||
- | * Under operations folder on mac | ||
- | * scalers (gives error if no bridge) | ||
==== Setting Optimization ==== | ==== Setting Optimization ==== | ||
=== Focused optics === | === Focused optics === | ||
+ | |||
* Expectations for A1900 FP to S800 FP transmission | * Expectations for A1900 FP to S800 FP transmission | ||
* 80% or better for mid-Z fragments | * 80% or better for mid-Z fragments | ||
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* Document optimized transmission with another run to disk to measure rate of fragment of interest at S800 FP | * Document optimized transmission with another run to disk to measure rate of fragment of interest at S800 FP | ||
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- | |||
- | === Matched optics === | ||
- | * Typically much more time is invested for optimizing optics for matched optics than for focused optics | ||
- | |||
- | * One input is optimizing for transmission | ||
- | |||
- | * For tritons a scintillator is required at the pivot position since fragments at 5 Tm will not reach S800 FP | ||
- | |||
- | * The last two analysis line triplets are used to tweak for the desired optical properties | ||
- | |||
- | * Document optimized transmission with another run to disk to measure rate of fragment of interest at S800 FP | ||
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==== Setting up Reaction Settings ==== | ==== Setting up Reaction Settings ==== | ||
+ | |||
* Calculating reaction setting | * Calculating reaction setting | ||
* Center unreacted beam at S800 FP | * Center unreacted beam at S800 FP | ||
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==== Coincidences ==== | ==== Coincidences ==== | ||
+ | |||
* Overview | * Overview | ||
* Most experiments at the S800 involve setting up an auxiliary detector system (e.g. SeGA, HiRA, etc) to be used in coincidence with the standard detectors of the S800. | * Most experiments at the S800 involve setting up an auxiliary detector system (e.g. SeGA, HiRA, etc) to be used in coincidence with the standard detectors of the S800. | ||
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====== Dispersion Matching tuning ====== | ====== Dispersion Matching tuning ====== | ||
+ | |||
In the dispersion-matching optics, the S800 focal point is achromatic, i.e. the position of the beam in the dispersive direction does not depend on the momentum. As a consequence, | In the dispersion-matching optics, the S800 focal point is achromatic, i.e. the position of the beam in the dispersive direction does not depend on the momentum. As a consequence, | ||