tuning_the_s800_xdt
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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tuning_the_s800_xdt [2015/10/22 17:04] pereira |
tuning_the_s800_xdt [2015/10/26 12:18] pereira [Timing setup] |
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| ====== Focus Mode ====== | ====== Focus Mode ====== | ||
| For most of the experiments in the S800, the analysis line is run in focus mode. In this optics, the analysis line is achromatic, i.e. the dispersive position of the beam focused in the target area (pivot point) does not depend on the momentum. Thus, this mode provides the biggest momentum acceptance (4%). On the other hand, since the spectrograph focal plane is chromatic, the resolution is limited to about 1 part in 1000 in energy. | For most of the experiments in the S800, the analysis line is run in focus mode. In this optics, the analysis line is achromatic, i.e. the dispersive position of the beam focused in the target area (pivot point) does not depend on the momentum. Thus, this mode provides the biggest momentum acceptance (4%). On the other hand, since the spectrograph focal plane is chromatic, the resolution is limited to about 1 part in 1000 in energy. | ||
| + | |||
| ===== Unreacted beam ===== | ===== Unreacted beam ===== | ||
| In the first part of the XDT, the rigidity of the S800 is typically set to match the value of the fragment beam (selected in the A1900) after passing through the S800 target. This is where the term " | In the first part of the XDT, the rigidity of the S800 is typically set to match the value of the fragment beam (selected in the A1900) after passing through the S800 target. This is where the term " | ||
| - | === 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) | ||
| + | |||
| + | {{:wiki: | ||
| * 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 | ||
| Line 258: | Line 263: | ||
| - | === 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 === | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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