tuning_the_s800_xdt
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tuning_the_s800_xdt [2023/08/18 17:49] pereira [Object scintillator setup] |
tuning_the_s800_xdt [2023/08/18 17:59] pereira [Object scintillator setup] |
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| * Check if there are reflections (typically seen at ~300 ns after main peak) | * Check if there are reflections (typically seen at ~300 ns after main peak) | ||
| - | * Using the scope, check the CFD setting: | + | |
| - | * Check CFD walk inspect signal in scope by triggering scope with CFD output | + | * Check [[s800 daq tools# |
| + | * Trigger oscilloscope with MCFD output (see labels in patch panel), and plug analog signal | ||
| + | * Verify that MCFD delay is ok | ||
| + | * Adjust MCFD gain based on signal amplitude | ||
| + | * Adjust threshold to minimize noise | ||
| + | * Check if MCFD output displays signals triggered by reflections (~300 ns following main peak). If that is the case, increase thresholds or signal width (this is valid only for low-rate experiments) | ||
| + | * Measure OBJ in scalers and compare it with DB5. Does it make sense? | ||
| + | * Stop beam and verify background (it should be minimum) | ||
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| + | * 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 | + | * Trigger oscilloscope with CFD output, and check analog |
| - | * With beam on/off, check amplitude of signals | + | * Adjust threshold |
| - | * Raise thresholds to get rid of noise signals. | + | * Check if CFD output displays |
| - | * NOTE: Be aware that sometimes, after running for a while, the OBJ box is activated. This results in a non-negligible count rate in OBJ scalers with beam off, which comes from HIGH amplitude signals (not noise). DO NOT try to eliminate this " | + | * Measure OBJ in scalers and compare it with DB5. Does it make sense? |
| - | * The ratio of OBJ to XFP scaler rates (channels OBJ.Scint and XFP.Scint) should reflect the transmission of the cocktail beam (between 60% to 90%, depending on quality of tunning) | + | * Stop beam and verify background (it should be minimum) |
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| + | * Be aware that sometimes, after running for a while, the OBJ box is activated. This results in a non-negligible count rate in OBJ scalers with beam off, which comes from HIGH amplitude signals (not noise). DO NOT try to eliminate this " | ||
| + | * The ratio of OBJ to ARIS (DB5) scaler rates (channels OBJ.Scint and XFP.Scint) should reflect the transmission of the cocktail beam (between 60% to 90%, depending on quality of tunning) | ||
| - | * Adjust MCFD threshold: | ||
| - | * Using the [[s800 daq tools# | ||
| - | * The OBJ signal feeding this module is not patched out to data U6 | ||
| - | * The OBJ signal from MCFD module goes to the Mesytec MTDC 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 | ||
| ==== FP scintillator setup ==== | ==== FP scintillator setup ==== | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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