tuning_the_s800_xdt
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tuning_the_s800_xdt [2015/10/20 15:01] pereira |
tuning_the_s800_xdt [2015/10/22 17:04] pereira |
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| === Send beam to FP === | === Send beam to FP === | ||
| + | * Ensure that the S800 spectrograph magnets are tuned to the right rigidity | ||
| + | |||
| + | * Verify that the beam blocker (labeled I255 Slits) in the S3 page of Barney is open: | ||
| + | * Expected " | ||
| * Ensure that CRAD04 (typically connected to object scintillator) is enabled with a rate limit of **20 kHz** (CRAD04 looks at E1 up FP scintillator) | * Ensure that CRAD04 (typically connected to object scintillator) is enabled with a rate limit of **20 kHz** (CRAD04 looks at E1 up FP scintillator) | ||
| - | * FP rate limit: **6 kHz** | + | * Remember: S800 FP rate limit is **6 kHz** |
| * **[[hv bias|Bias]]** S800 FP scintillator photomultipliers | * **[[hv bias|Bias]]** S800 FP scintillator photomultipliers | ||
| * Set bias to best guess based on previous experience for the fragment Z being used (bias will be adjusted later during tuning) | * Set bias to best guess based on previous experience for the fragment Z being used (bias will be adjusted later during tuning) | ||
| - | * Typical values: | + | * Typical values |
| * For He-3 @ ~130 MeV/u: UP (1790 V); DOWN (1760 V) | * For He-3 @ ~130 MeV/u: UP (1790 V); DOWN (1760 V) | ||
| * For Be-12 @ ~30 MeV/u: UP (1770 V); DOWN (1700 V) | * For Be-12 @ ~30 MeV/u: UP (1770 V); DOWN (1700 V) | ||
| Line 29: | Line 33: | ||
| * Remove stops to look for beam at S800 FP with **[[s800 daq tools# | * Remove stops to look for beam at S800 FP with **[[s800 daq tools# | ||
| - | * Look at FP scintillator scalers (E1 up, E1 down): | + | * Look at FP scintillator scalers (E1 up, E1 down) |
| - | * There are typically a few scaler counts without beam | + | * There are typically a few scaler counts without beam |
| - | * Ion chamber does not have scalers | + | |
| Line 40: | Line 44: | ||
| * Use **[[electronics overview|scope]]** to look at signal patched out to data U6 (channel #54 in data U6 patch panel) | * Use **[[electronics overview|scope]]** to look at signal patched out to data U6 (channel #54 in data U6 patch panel) | ||
| - | * This signal is sent to the CFD in data U6 | + | * This signal is sent to the CANBERRA 454 Quad CFD in data U6 |
| - | * Check raising time and amplitude. Good signal: | + | * One of the output from this CFD is sent (via patch panel #62) to the TAC and scaler (channel OBJ.Scint) in S3. The other output goes through a passive delayed, and is sent (via patch panel #67) to the Phillips TDC |
| + | * Check raising time and amplitude. Good signal: | ||
| - | * Using the scope, check the CFD setting | + | * Using the scope, check the CFD setting: |
| * Check CFD walk inspect signal in scope by triggering scope with CFD output | * Check CFD walk inspect signal in scope by triggering scope with CFD output | ||
| - | * Ensure that CFD delay cable is ok: about 80% of raising time of the input signal | + | * Ensure that CFD delay cable is ok: about 80% of raising time of the input signal |
| + | * Adjust CFD threshold looking at scalers. The ratio of OBJ to XFP scaler rates (channels OBJ.Scint and XFP.Scint) should reflect the transmission of the cocktail beam | ||
| + | * Adjust MCFD threshold: | ||
| + | * Open configuration file **MCFD16.tcl** in **/ | ||
| + | * The OBJ signal feeding this module is not patched out to data U6 | ||
| + | * The OBJ signal from MCFD-16 module goes to the Mesytec MTDC32 module and scaler (channel OBJ.MCFD.Scint) | ||
| + | * Make sure that the threshold of the XFP MCFD channel is reasonable. Rates in scaler channels XFP.Scint and XFP.MCFD.Scint should be comparable | ||
| + | * Adjust MCFD OBJ threshold looking at scalers. The ratio of OBJ to XFP scaler rates (channels OBJ.MCFD.Scint and XFP.MCFD.Scint) should reflect the transmission of the cocktail beam | ||
| + | * Save new threshold in configuration file **MCFD16.tcl** | ||
| + | |||
| * 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 | ||
| Line 52: | Line 66: | ||
| === FP scintillator setup === | === FP scintillator setup === | ||
| - | * Set trigger to “s800 trigger” | + | * Set trigger to “s800 trigger” |
| - | * Ensure that the **[[s800 daq tools# | + | * Ensure that the **[[s800 daq tools# |
| - | * Under trigger tab select **s800 trigger** (which is E1 up by definition) | + | * Under trigger tab select **s800 trigger** (which is E1 up by definition) |
| * Deselect experiment trigger | * Deselect experiment trigger | ||
| * SAVE TO FILE | * SAVE TO FILE | ||
| - | * Stop and start **[[s800 daq tools#Run Control Window|RunControl]]** to assert new trigger condition | + | * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** to assert new trigger condition |
| * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** | ||
| Line 87: | Line 101: | ||
| {{: | {{: | ||
| - | * Gains are controlled in **s800shpini.tcl** file in directory | + | * Gains are controlled in **s800shpini.tcl** file in directory |
| * First shaper is for ion chamber | * First shaper is for ion chamber | ||
| * Typically, only coarse gains are used | * Typically, only coarse gains are used | ||
| - | * Stop and start **[[s800 daq tools#Run Control Window|RunControl]]** to assert new gain values | + | * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** to assert new gain values |
| Line 99: | Line 113: | ||
| * Patched to data-U6 on labeled connector | * Patched to data-U6 on labeled connector | ||
| * **200 – 500 mV** signals are good | * **200 – 500 mV** signals are good | ||
| + | * CRDC1 anode is noisier (digital noise) than CRDC2 | ||
| * Bias CRDC1 and CRDC2. Typical starting values: | * Bias CRDC1 and CRDC2. Typical starting values: | ||
| * For He-3 @ ~130 MeV/u: CRDC1 (Anode=1120 V, Drift=1000 V); CRDC2 (Anode=1120 V; Drift=1000 V) | * For He-3 @ ~130 MeV/u: CRDC1 (Anode=1120 V, Drift=1000 V); CRDC2 (Anode=1120 V; Drift=1000 V) | ||
| Line 110: | Line 125: | ||
| * Count rate is a little higher than on scintillator due to noise or thresholds | * Count rate is a little higher than on scintillator due to noise or thresholds | ||
| - | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS.win** to verify the good performance of the detectors. (The spectra for each CRDC can be checked separatelly in windows **s800_CRDC1.win** and **S800_CRDC2.win**) | + | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS.win** |
| * Spectra **crdc1.raws** and **crdc2.raws** (top and middle spectra in the leftmost (first) column) | * Spectra **crdc1.raws** and **crdc2.raws** (top and middle spectra in the leftmost (first) column) | ||
| Line 117: | Line 132: | ||
| * Width of beam peak is proportional to A1900 p-acceptance in focus optics | * Width of beam peak is proportional to A1900 p-acceptance in focus optics | ||
| * Width is narrower in match optics | * Width is narrower in match optics | ||
| - | * Adjust anode HV to bring fuzzy maximum to around 600-700 channels (the ADC for each pad saturates | + | * Adjust anode HV to bring fuzzy maximum to around 600-700 channels (saturation of each pad at ~ 1000 ch) |
| * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** (top and middle spectra in the second column) | * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** (top and middle spectra in the second column) | ||
| Line 133: | Line 148: | ||
| | | ||
| * Spectra **crdc1.xg** and **crdc2.xg** (bottom spectra in first and second columns) | * Spectra **crdc1.xg** and **crdc2.xg** (bottom spectra in first and second columns) | ||
| - | * It shows the position of the beam in the dispersive direction, evaluated by calculating the " | + | * It shows the position of the beam in the dispersive direction, evaluated by calculating the " |
| * Spectra **crdc1.tac** and **crdc2.tac** (bottom spectra in third and fourth columns) | * Spectra **crdc1.tac** and **crdc2.tac** (bottom spectra in third and fourth columns) | ||
| - | * They correspond to the non-dispersive position of the beam in the CRDCs. | + | * They correspond to the non-dispersive position of the beam in the CRDCs. |
| {{: | {{: | ||
| Line 143: | Line 158: | ||
| === Timing setup === | === Timing setup === | ||
| + | |||
| + | Overview: | ||
| + | |||
| + | * There are three electronic " | ||
| + | * 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) | ||
| + | * MTDC: | ||
| + | * Before getting into the MTDC, the OBJ, XFP, and E1 up signals in the MTDC go through a Mesytec MCFD | ||
| + | * The OBJ signal into the MCFD comes directly from the detector via S3 patch panel #94 (i.e., there is no signal to check in data U6) | ||
| + | * The XFP signal into the MCFD module comes from data-U6 patch panel #70, connected to the CANBERRA 454 CFD XFP output | ||
| + | * SpecTcl calculates the OBJ-to-Focal-Plane and XFP-to-Focal-Plane ToFs by substracting the E1 up time (MTDC channel 15) to the OBJ time (MTDC channel 3) and the XFP time (MTDC channel 2) | ||
| + | * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide | ||
| + | * Tennelec TACs: | ||
| + | * The OBJ **stop** signal to the " | ||
| + | * The XFP **stop** signal to the " | ||
| + | |||
| + | * Phillips TDC: | ||
| + | * 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 | ||
| + | * SpecTcl calculates the OBJ-to-Focal-Plane and XFP-to-Focal-Plane ToFs by substracting the E1 up time (channel 8) to the OBJ time (channel 14) and the XFP time (channel 15) | ||
| + | |||
| + | * 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. | ||
| + | |||
| + | * 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 | ||
| + | |||
| + | |||
| + | * 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 | ||
| + | |||
| * See [[http:// | * See [[http:// | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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