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tuning_the_s800_xdt [2015/10/26 14:01] pereira |
tuning_the_s800_xdt [2015/10/26 14:04] pereira |
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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 | ||
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==== Checking Particle ID and rate at S800 FP ==== | ==== Checking Particle ID and rate at S800 FP ==== | ||
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* Take a run on disk | * Take a run on disk | ||
* Measure the beam intensity again and calculate the average value | * 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 **/ | + | * 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 **/ | * 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 | * Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission | ||
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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. | ||
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- | ==== Setup beamline ==== | ||
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- | * 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 | ||
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- | * Set spectrograph Brho for unreacted fragment | ||
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- | ==== Start scalers ==== | ||
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- | * Use s800 account | ||
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- | * 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 | ||
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- | * Under operations folder on mac | ||
- | * scalers (gives error if no bridge) | ||
==== Setting Optimization ==== | ==== Setting Optimization ==== | ||
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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 === | ||
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- | * Typically much more time is invested for optimizing optics for matched optics than for focused optics | ||
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- | * One input is optimizing for transmission | ||
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- | * For tritons a scintillator is required at the pivot position since fragments at 5 Tm will not reach S800 FP | ||
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- | * The last two analysis line triplets are used to tweak for the desired optical properties | ||
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- | * Document optimized transmission with another run to disk to measure rate of fragment of interest at S800 FP | ||