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 [2017/07/24 10:48] pereira |
tuning_the_s800_xdt [2023/08/18 17:35] pereira [Send beam to FP] |
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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** | ||
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| * 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 | ||
| + | |||
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| * Adjust MCFD threshold: | * Adjust MCFD threshold: | ||
| - | * Using the [[s800 daq tools# | + | * Using the [[s800 daq tools# |
| * 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 module goes to the Mesytec MTDC module and scaler (channel OBJ.MCFD.Scint) | * The OBJ signal from MCFD module goes to the Mesytec MTDC module and scaler (channel OBJ.MCFD.Scint) | ||
| Line 80: | Line 79: | ||
| * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** 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** in directory **/ | + | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** in directory **/ |
| Line 109: | Line 108: | ||
| {{: | {{: | ||
| - | * Gains are controlled in **s800shpini.tcl** file in directory **s800/operations/daq/usb/Configs** (an example of the content of this file can be seen {{: | + | * Gains are controlled in **s800shpini.tcl** file in directory **/user/s800/s800daq/Configurations** (an example of the content of this file can be seen {{: |
| * First shaper is for ion chamber | * First shaper is for ion chamber | ||
| * Typically, only coarse gains are used | * Typically, only coarse gains are used | ||
| Line 141: | Line 140: | ||
| * Width is narrower in match optics | * Width is narrower in match optics | ||
| * 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) | ||
| - | * 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**, |
| * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** | * Spectra **crdc1.anode_crdc1.tac** and **crdc2.anode_crdc2.tac** | ||
| Line 163: | Line 162: | ||
| * Spectra **crdc1.pad_mult** and **crdc2.pad_mult** | * Spectra **crdc1.pad_mult** and **crdc2.pad_mult** | ||
| - | * They show the distribution of pad multiplicies | + | * They show the distribution of pad multiplicities |
| {{: | {{: | ||
| Line 182: | Line 181: | ||
| * Select SpecTcl window **S800_TOF.win** | * Select SpecTcl window **S800_TOF.win** | ||
| - | * The three columns correspond to the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) | + | * The three columns correspond to the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right). |
| - | * The first (top) row corresponds to the Phillips TDC | + | * The first (top) row corresponds to the Phillips TDC. |
| * The second row corresponds to the MTDC with all the hits included. Note that in a unreacted-beam setting, the first hit typically provides the " | * The second row corresponds to the MTDC with all the hits included. Note that in a unreacted-beam setting, the first hit typically provides the " | ||
| - | * The third row corresponds to the MTDC with only the first hit | + | * The third row corresponds to the MTDC with only the first hit. |
| - | * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** | + | * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC**. |
| - | * The two spectra in the fifth row corresponds | + | * The two spectra in the fifth row correspond |
| * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow | * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow | ||
| * The MTDC delays should never need to be adjusted because the matching window is sufficiently wide (around 4000 ns) | * The MTDC delays should never need to be adjusted because the matching window is sufficiently wide (around 4000 ns) | ||
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| * Measure the beam intensity again and calculate the average value | * Measure the beam intensity again and calculate the average value | ||
| * In [[s800 SpecTcl|SpecTcl GUI]], click **Attach to File** and select data file **run-xxxx-xx.evt** in directory **/ | * In [[s800 SpecTcl|SpecTcl GUI]], click **Attach to File** and select data file **run-xxxx-xx.evt** in directory **/ | ||
| - | * Check the run time and live time from the corresponding scaler file in directory **/ | + | * Check the run time and live time from the corresponding scaler file in directory **/ |
| * Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission | * Calculate the rate and purity and compare with the value in the A1900 FP to determine the transmission | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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