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 [2015/10/21 14:02] pereira |
tuning_the_s800_xdt [2015/10/21 16:09] pereira |
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| * Adjust MCFD threshold: | * 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 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) | * 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 | * 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** | ||
| Line 111: | Line 112: | ||
| * 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 | + | * CRDC1 anode is noisier (digital noise) |
| * 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 123: | 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 130: | 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 146: | Line 147: | ||
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| * 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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