tuning_the_s800_xdt
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tuning_the_s800_xdt [2023/07/24 17:51] swartzj |
tuning_the_s800_xdt [2023/08/18 17:53] pereira [Object scintillator setup] |
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| * Ensure that the S800 spectrograph magnets are tuned to the right rigidity | * Ensure that the S800 spectrograph magnets are tuned to the right rigidity | ||
| - | * Verify that the beam blocker | + | * Verify that the FP beam blocker is fully open: |
| - | * Expected " | + | |
| - | + | ||
| - | * Ensure that CRAD04 is enabled with a rate limit of **20 kHz** (CRAD04 looks at E1 up FP scintillator) | + | |
| * Remember: S800 FP rate limit is **6 kHz** | * Remember: S800 FP rate limit is **6 kHz** | ||
| Line 31: | Line 28: | ||
| * For U-238 (88+) @ ~70 MeV/u: UP (1180 V); DOWN (1280 V) | * For U-238 (88+) @ ~70 MeV/u: UP (1180 V); DOWN (1280 V) | ||
| - | * Have a good expectation of rate from A1900 group information or from timing scintillators (typically | + | * Have a good expectation of rate from ARIS group information or from timing scintillators (typically |
| - | * 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 | ||
| + | * If needed, adjust beam rate with operators | ||
| + | |||
| Line 44: | Line 43: | ||
| * Bias detector. Typical bias: **1200-1800 V** (up to 2200 V) | * Bias detector. Typical bias: **1200-1800 V** (up to 2200 V) | ||
| - | * Use **[[electronics overview|scope]]** | + | * Use oscilloscope |
| - | * 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: ~10 ns raising time; 400-500 mV amplitude | * Check raising time and amplitude. Good signal: ~10 ns raising time; 400-500 mV amplitude | ||
| + | * Check if there are reflections (typically seen at ~300 ns after main peak) | ||
| + | * Adjust MCFD threshold: | ||
| + | * 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) | ||
| + | |||
| + | * 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** | ||
| + | |||
| + | |||
| + | |||
| * 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 | ||
| Line 58: | Line 71: | ||
| * 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) | * 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) | ||
| - | * 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 | * Watch for no rate change on scaler display with a bias adjustment up or down of about 50-100 V | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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