tuning_the_s800_xdt
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tuning_the_s800_xdt [2017/07/18 11:48] pereira [CRDCs setup] |
tuning_the_s800_xdt [2017/07/21 17:35] pereira [CRDCs setup] |
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| * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS.win** (see figure below) 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** (see figure below) 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**) | ||
| - | * Spectra **crdc1.raws** and **crdc2.raws** | + | * Spectra **crdc1.raws** and **crdc2.raws** |
| * Each spectra shows the multiple sampled signals from each pad | * Each spectra shows the multiple sampled signals from each pad | ||
| * These are good spectra to check if the pad thresholds are properly set. Thresholds are too low if you see that all pads are firing at low energies. If that's the case, increase the pad thresholds in files **s800crdcv1.tcl** and **s800crdcv2.tcl**, | * These are good spectra to check if the pad thresholds are properly set. Thresholds are too low if you see that all pads are firing at low energies. If that's the case, increase the pad thresholds in files **s800crdcv1.tcl** and **s800crdcv2.tcl**, | ||
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| * Adjust anode HV to bring fuzzy maximum to around 600-700 channels (saturation of each pad at ~ 1000 ch) | * 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** | + | * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** |
| * This spectrum is used to ensure that the field in the detectors is uniform and well aligned. If the detector is working properly, then the amplitude of the ANODE signals should not depend on the position of the beam (as shown in the figure below) | * This spectrum is used to ensure that the field in the detectors is uniform and well aligned. If the detector is working properly, then the amplitude of the ANODE signals should not depend on the position of the beam (as shown in the figure below) | ||
| * If the field is not well aligned, then there will be a correlation between ANODE signals and TAC signals | * If the field is not well aligned, then there will be a correlation between ANODE signals and TAC signals | ||
| - | * Spectra **crdc1.x_crdc1.padsum** and **crdc2.x_crdc2.padsum** | + | * Spectra **crdc1.x_crdc1.padsum** and **crdc2.x_crdc2.padsum** |
| * It shows the sum over multiple sampled signals from each pad along the (dispersive) x position | * It shows the sum over multiple sampled signals from each pad along the (dispersive) x position | ||
| * The padsum signals should not show any correlation with the x (dispersive) position | * The padsum signals should not show any correlation with the x (dispersive) position | ||
| - | * Spectra **crdc1.xg_crdc1.tac** and **crdc2.xg_crdc2.tac** | + | * Spectra **crdc1.xg_crdc1.tac** and **crdc2.xg_crdc2.tac** |
| * It shows the beam distribution in the dispersive (xg) //vs// non-dispersive (tac) directions | * It shows the beam distribution in the dispersive (xg) //vs// non-dispersive (tac) directions | ||
| * It is used to ensure that the fragment beam is centered in the detectors | * It is used to ensure that the fragment beam is centered in the detectors | ||
| * It is also used to see the effect of the beam blocker (used to stop intense contaminants) in the cocktail beam | * It is also used to see the effect of the beam blocker (used to stop intense contaminants) in the cocktail beam | ||
| | | ||
| - | * Spectra **crdc1.xg** and **crdc2.xg** | + | * Spectra **crdc1.xg** and **crdc2.xg** |
| * 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 " | ||
| - | + | | |
| - | | + | |
| * 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. | ||
| + | |||
| + | * Spectra **crdc1.pad_mult** and **crdc2.pad_mult** | ||
| + | * They show the distribution of pad multiplicies (i.e. number of pads firing for each event). Typical average values are ~10-15. Significantly larger average multiplicities might indicate that the thresholds are set too low. | ||
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tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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