tuning_the_s800_xdt
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tuning_the_s800_xdt [2015/10/20 15:01] pereira |
tuning_the_s800_xdt [2015/10/21 16:50] pereira [Unreacted beam] |
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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 |
| - | * | + | * 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: | + | * 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 54: | 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 89: | 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 101: | 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 112: | 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 119: | 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 135: | 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 145: | Line 158: | ||
| === Timing setup === | === Timing setup === | ||
| + | |||
| + | rview: | ||
| + | |||
| + | * There are three electronic " | ||
| + | * MTDC: | ||
| + | * The OBJ and XFP signals comes from the MCFD module | ||
| + | * The OBJ signal into the MCFD comes from the detector via S3 patch panel #94 (going to the target area) | ||
| + | * The XFP signal into the MCFD module comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD XFP output in data U6 | ||
| + | * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide | ||
| + | * Tennelec TACs: | ||
| + | * The OBJ and XFP signals do not go through the MCFD module | ||
| + | * The OBJ stop signal comes from data-U6 patch panel #62, which is connected to the CANBERRA 454 CFD OBJ output in data U6. The corresponding CFD input is connected to data-U6 patch panel #54 | ||
| + | |||
| + | * The XFP stop signal comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD OBJ output in data U6. The corresponding CFD input receives the signal via patch panel to data U1 | ||
| + | |||
| + | |||
| + | * | ||
| + | * the detector via S3 patch panel #94 (going to the target area) | ||
| + | * The XFP signal into the MCFD module comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD output in data U6 | ||
| + | * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide | ||
| + | |||
| + | |||
| + | |||
| + | * Phillips TDC: | ||
| + | * The OBJ and XFP signals do not go through the MCFD module | ||
| + | * The OBJ stop signal comes from data-U6 patch panel #67. | ||
| + | * | ||
| + | * The XFP signal into the MCFD module comes from data-U6 patch panel #70, which is connected to the CANBERRA 454 CFD output in data U6 | ||
| + | |||
| + | * The full range of the TACs and Phillips TDC is ~400 ns | ||
| + | * | ||
| * See [[http:// | * See [[http:// | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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