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tuning_the_s800_xdt [2015/10/25 16:27] pereira |
tuning_the_s800_xdt [2015/10/26 12:33] pereira [Timing setup] |
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- | === Send beam to FP === | + | ==== Send beam to FP ==== |
* Ensure that the S800 spectrograph magnets are tuned to the right rigidity | * Ensure that the S800 spectrograph magnets are tuned to the right rigidity | ||
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- | === Object scintillator setup === | + | ==== Object scintillator setup ==== |
* Bias detector. Typical bias: **1200-1800 V** (up to 2200 V) | * Bias detector. Typical bias: **1200-1800 V** (up to 2200 V) | ||
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* Watch for no rate change on scaler display with a bias adjustment up or down of about 50-100 V | * Watch for no rate change on scaler display with a bias adjustment up or down of about 50-100 V | ||
- | === FP scintillator setup === | + | ==== FP scintillator setup ==== |
* Set trigger to “s800 trigger” | * Set trigger to “s800 trigger” | ||
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- | === Ionization Chamber setup === | + | ==== Ionization Chamber setup ==== |
* Gas should be [[Gas handling system# | * Gas should be [[Gas handling system# | ||
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- | === CRDCs setup === | + | ==== CRDCs setup ==== |
* **[[hv bias#hv remote control|Bias]]** CRDCs | * **[[hv bias#hv remote control|Bias]]** CRDCs | ||
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- | === Timing setup === | + | ==== Timing setup ==== |
+ | At present, there are three electronic " | ||
- | Overview: | ||
- | * There are three electronic " | + | * Select SpecTcl window S800_TOF.win |
+ | * Make sure that the time range of spectra is wide enough (e.g. between -3000 to 3000) | ||
+ | * 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 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 " | ||
+ | |||
+ | {{: | ||
* Although the ToF reference (" | * Although the ToF reference (" | ||
* Before going to the ToF modules, the OBJ and XFP signals are sent to a CANBERRA CFD 454 CFD in data U6 from the data-U6 patch panel (OBJ: patch panel #54, XFP: patch panel #1). (The exception is the OBJ signal into the MTDC) | * Before going to the ToF modules, the OBJ and XFP signals are sent to a CANBERRA CFD 454 CFD in data U6 from the data-U6 patch panel (OBJ: patch panel #54, XFP: patch panel #1). (The exception is the OBJ signal into the MTDC) | ||
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* All of the trigger signals are not pipelined and are thus subject to deadtime | * All of the trigger signals are not pipelined and are thus subject to deadtime | ||
- | === Checking Particle ID and rate at S800 FP === | + | ==== Checking Particle ID and rate at S800 FP ==== |
* Establish PID | * Establish PID | ||
* Refer to information on setting from A1900 FP | * Refer to information on setting from A1900 FP | ||
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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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- | === Setup beamline === | + | ==== Setup beamline |
* Object and XF scintillators and intermediate image PPACs inserted if they will be used | * 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 | * 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 | * Set spectrograph Brho for unreacted fragment | ||
- | === Start scalers === | + | ==== Start scalers |
* Use s800 account | * Use s800 account | ||
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* scalers (gives error if no bridge) | * scalers (gives error if no bridge) | ||
- | === Setting Optimization === | + | ==== Setting Optimization |
=== Focused optics === | === Focused optics === |