tuning_the_s800_xdt
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tuning_the_s800_xdt [2015/10/22 15:10] pereira |
tuning_the_s800_xdt [2015/10/26 12:41] 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) | ||
| Line 64: | Line 65: | ||
| * 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# | ||
| Line 107: | Line 108: | ||
| - | === CRDCs setup === | + | ==== CRDCs setup ==== |
| * **[[hv bias#hv remote control|Bias]]** CRDCs | * **[[hv bias#hv remote control|Bias]]** CRDCs | ||
| Line 157: | Line 158: | ||
| - | === Timing setup === | + | ==== Timing setup ==== |
| + | At present, there are three electronic " | ||
| - | rview: | ||
| - | * There are three electronic " | + | * Select SpecTcl window **S800_TOF.win** |
| - | * The OBJ, XFP, and E1 up signals | + | * The three columns correspond to the RF-FP ToF (left), OBJ-FP (center), and XFP-FP (right) |
| - | * Before going to the TACs and TDC, 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 first (top) row corresponds |
| - | * MTDC: | + | * The second row corresponds |
| - | * The OBJ signal into the MCFD comes from the detector via S3 patch panel #94 (going to the target area) | + | * The third row corresponds |
| - | * The XFP signal into the MCFD module comes from data-U6 patch panel #70, connected | + | * The fourth row corresponds |
| - | * SpecTcl calculates the ToF by substracting | + | * 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 |
| - | * The MTDC timing signals do not require external delay adjustments | + | * An empty ToF spectrum means that either |
| - | * Tennelec TACs: | + | * The MTDC spectra should never be empty because the matching window is sufficiently wide (around 4000 ns) |
| - | * The OBJ **stop** signal to the " | + | |
| - | * The XFP **stop** signal to the " | + | |
| - | * Phillips TDC: | + | {{:wiki: |
| - | * The OBJ output signal from the CANBERRA 454 CFD is delayed with the low-noise delay boxes in data-U6, and sent to the TDC via patch panel #67 | + | |
| - | * The XFP output signal from the CANBERRA 454 CFD is delayed with the low-noise delay boxes in data-U6, and sent to the TDC via patch panel #66 | + | |
| - | * The TDC start is sent from the ULM trigger module. Since the delay of the S800 trigger may be adjusted during XDT, the stop signals (e.g. from OBJ or XFP) will need to be re-adjusted. | + | |
| - | | + | |
| - | * 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 | + | |
| - | * They can be inspected, however using the GUI | + | |
| - | + | ||
| - | + | ||
| - | * 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 | + | |
| - | + | ||
| - | * 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 | + | |
| Line 219: | Line 200: | ||
| * 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 | ||
| Line 232: | Line 213: | ||
| - | === 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 255: | Line 236: | ||
| - | === 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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