tuning_the_s800_xdt
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tuning_the_s800_xdt [2015/10/21 10:51] pereira |
tuning_the_s800_xdt [2015/10/21 16:09] 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) | ||
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| * 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) | ||
| + | * Adjust CFD 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 65: | ||
| === 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 100: | ||
| {{: | {{: | ||
| - | * 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 |
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| * 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 124: | ||
| * 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 131: | ||
| * 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 147: | ||
| | | ||
| * 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) | ||
| - | * They correspond to the non-dispersive position of the beam in the CRDCs. The peak should be in the middle of the spectra in order to center the beam | ||
| + | * 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. | ||
| {{: | {{: | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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