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tuning_the_s800_xdt [2015/10/26 14:11] pereira [Analysis line classic PPAC setup (Focus optics only)] |
tuning_the_s800_xdt [2017/06/17 15:12] pereira [Coincidences] |
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* Expected " | * Expected " | ||
- | * Ensure that CRAD04 | + | * 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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* 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 | ||
* 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 CFD threshold looking at scalers. The ratio of OBJ to XFP scaler rates (channels OBJ.Scint and XFP.Scint) should reflect the transmission of the cocktail beam | + | * Adjust CFD threshold looking at scalers. |
+ | * With beam on/off, check amplitude of signals from OBJ. You should be able to clearly see the difference between noise signals and fragment-beam signals. | ||
+ | * Raise thresholds to get rid of noise signals. | ||
+ | * 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 " | ||
+ | * 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: | * Adjust MCFD threshold: | ||
- | * Open configuration file **MCFD16.tcl** in **/user/s800/ | + | * 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-16 module goes to the Mesytec | + | * The OBJ signal from MCFD module goes to the Mesytec |
* 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 | * 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 | * 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 | ||
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==== FP scintillator setup ==== | ==== FP scintillator setup ==== | ||
+ | |||
+ | * Make sure that S800 DAQ is in [[s800 daq tools# | ||
* Set trigger to “s800 trigger” | * Set trigger to “s800 trigger” | ||
- | * Ensure that the **[[s800 daq tools# | + | * Ensure that the **[[s800 daq tools# |
* Under trigger tab select **s800 trigger** (which is E1 up by definition) | * Under trigger tab select **s800 trigger** (which is E1 up by definition) | ||
* Deselect experiment trigger | * Deselect experiment trigger | ||
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* 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** | + | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** |
* Adjust **[[hv bias|bias]]** looking at 2D spectra **e1.deup_e1.dedown** (showing the parameters s800.fp.e1.de_down vs. s800.fp.e1.de_up) for the FP E1 scintillator | * Adjust **[[hv bias|bias]]** looking at 2D spectra **e1.deup_e1.dedown** (showing the parameters s800.fp.e1.de_down vs. s800.fp.e1.de_up) for the FP E1 scintillator | ||
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- | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_IC.win** | + | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_IC.win** |
* Adjust pad gains | * Adjust pad gains | ||
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* 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. | ||
- | {{: | + | {{: |
+ | |||
+ | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS_EFF.win** (see figure below) to verify the efficiency of the detectors. | ||
+ | * Start a new run recording data on disk | ||
+ | * Make a gate in spectrum **ic.sum** (top right plot) to select the Z region of interest, and call it **ic** | ||
+ | * Make a summing region around the " | ||
+ | * Stop the run and rescan data from disk | ||
+ | * Compare the number of event inside the 2D summing regions with the number of events inside the **ic** gate. Typically the former are very close to the later (nearly 100% efficiency for medium/high Z) | ||
+ | |||
+ | {{: | ||
==== Timing setup ==== | ==== Timing setup ==== | ||
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* 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 | + | * 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 to the MTDC summary spectra of OBJ-FP and XFP-FP ToFs (zoomed in). The spectra show the ToF (vertical axis) vs. hit number (horizontal axis). | + | * The two spectra in the fifth row corresponds to the MTDC summary spectra of OBJ-FP and XFP-FP ToFs (zoomed in). The spectra show the ToF (vertical axis) vs. hit number (horizontal axis). |
* 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 spectra | + | * The MTDC delays |
{{: | {{: | ||
- | * If necessary, adjust delays: | + | |
- | * Using the [[S800 DAQ tools# | + | * Use the spectra **TOF.MTDC_RF**, |
- | * Select | + | * Using the cursor mouse, check the lower and higher limits defining the region in the MTDC ToF spectra with the " |
- | * Adjust the TDC delays of OBJ and XFP using the delay boxes connected to the CANBERRA CFD 454 in data U6 | + | * Go to the **Variables** page in SpecTcl GUI and assign the limits to the following variables: |
- | * Adjust | + | * **s800.fp.vmetdc.mtdc_rflow** and **s800.fp.vmetdc.mtdc_rfhigh** for RF-XFP |
- | * In principle, the TACs delays don't need to be adjusted | + | * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_objhigh** for OBJ-XFP |
+ | * **s800.fp.vmetdc.mtdc_xfplow** and **s800.fp.vmetdc.mtdc_xfphigh** for XFP-XFP | ||
+ | * For each ToF, SpecTcl will search the hit number that fits in the selected region. The new MTDC ToF parameters are **s800.fp.vmetdc.mtdc_rf**, | ||
+ | |||
+ | | ||
+ | * Using the [[S800 DAQ tools# | ||
+ | * Connect | ||
+ | * Adjust the TDC delays of OBJ and/or XFP with respect to the TDC start using the delay boxes connected to the CANBERRA CFD 454 in data U6 (~200 ns delay is good) | ||
+ | * Check the corresponding ToF spectra in SpecTcl to confirm that the timings are properly adjusted. | ||
+ | |||
+ | * Check the efficiencies | ||
+ | * Make a gate on spectrum **IC.SUM** selecting the region of interest, and call it " | ||
+ | * Looking at the ToF spectra gated on " | ||
+ | * The window file **S800_TOF_EFFICIENCY.win** includes all the spectra needed | ||
==== Checking Particle ID and rate at S800 FP ==== | ==== Checking Particle ID and rate at S800 FP ==== | ||
- | * Select SpecTcl window **S800_PID.win** in directory **/ | + | * Select SpecTcl window **S800_PID.win** |
* The three columns correspond to the PID determined with the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) | * The three columns correspond to the PID determined with 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 PID spectra using the Phillips TDC |
- | * The second row corresponds to the MTDC with just the first hit included | + | * The second row corresponds to PID spectra using the MTDC with __just |
- | * The third row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** | + | * The third row corresponds to PID spectra using the MTDC including the correct hit corresponding to the good ToF peak (see previous section) |
+ | * The fourth row corresponds to PID spectra using the MTDC gated on the " | ||
+ | * The fifth row corresponds to PID spectra using the ORTEC TACs. Note that there is not **RF-FP TAC** | ||
* You might need to adjust the limits of the spectra to get a good resolution | * You might need to adjust the limits of the spectra to get a good resolution | ||
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* Establish PID and measure rate | * Establish PID and measure rate | ||
- | * Determine | + | * Choose your favorite PID spectrum and determine |
* Take gates around the fragment of interest | * Take gates around the fragment of interest | ||
* Measure the beam intensity the appropriate faraday cup | * Measure the beam intensity the appropriate faraday cup | ||
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==== Setting Optimization ==== | ==== Setting Optimization ==== | ||
- | |||
- | === Focused optics === | ||
* Expectations for A1900 FP to S800 FP transmission | * Expectations for A1900 FP to S800 FP transmission | ||
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* Want to balance losses between S800 analysis line and Transfer Hall (the S800 analysis line is typically slightly worse) | * Want to balance losses between S800 analysis line and Transfer Hall (the S800 analysis line is typically slightly worse) | ||
* Best diagnostic is scalers from S800 FP, object scintillator and XF scintillator | * Best diagnostic is scalers from S800 FP, object scintillator and XF scintillator | ||
- | * Tweak y-quads (while watching scalers) in front of dipole gaps (this works both for Transfer Hall and analysis line); choose elements that have biggest effect with smallest ratio change | + | * Using the knob box and the NCS application **QtKM** (file **BLSetup_A1900.gkm**), |
* Document optimized transmission with another run to disk to measure rate of fragment of interest at S800 FP | * Document optimized transmission with another run to disk to measure rate of fragment of interest at S800 FP | ||
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- | ====== Dispersion Matching | + | ====== Dispersion Matching |
In the dispersion-matching optics, the S800 focal point is achromatic, i.e. the position of the beam in the dispersive direction does not depend on the momentum. As a consequence, | In the dispersion-matching optics, the S800 focal point is achromatic, i.e. the position of the beam in the dispersive direction does not depend on the momentum. As a consequence, | ||
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* Set trigger to “s800 trigger” | * Set trigger to “s800 trigger” | ||
- | * Ensure that the **[[s800 daq tools# | + | * Ensure that the **[[s800 daq tools# |
* Under trigger tab select **s800 trigger** (which is E1 up by definition) | * Under trigger tab select **s800 trigger** (which is E1 up by definition) | ||
* Deselect experiment trigger | * Deselect experiment trigger | ||
* SAVE TO FILE | * SAVE TO FILE | ||
- | * Stop and start **[[s800 daq tools#Run Control Window|RunControl]]** to assert new trigger condition | + | * Begin a new run on [[#Readout GUI|Readout GUI]] to assert new trigger condition |
* Select **[[s800 SpecTcl|Spectcl]]** window **S800_DISPMATCH.win** | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_DISPMATCH.win** | ||
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| | ||
* The leftmost peak corresponds to reactions with H. The central peak are reaction with C. The goal of the tweak is to make these peaks as narrow as possible | * The leftmost peak corresponds to reactions with H. The central peak are reaction with C. The goal of the tweak is to make these peaks as narrow as possible | ||
- | * Open the NCS application **QtKM** in the Applications Menu. Open file **BLSetup_A1900.gkm**. The magnetic elements that are typically tweaked with the knob box seating | + | * Open the NCS application **QtKM** in the Applications Menu. Open file **BLSetup_A1900.gkm**. The magnetic elements that are typically tweaked with the knob box sitting |
| | ||
* The two figures below show the spectrum **CRDC1.XG!FOI-AFP-BFP** before (top) and after (bottom) the dispersion-matching tuning for a typical experiment. Be aware that the width given by SpecTcl for the selected peak is not too reliable. It is more convenient to do a real gaussian fit. Unfortunatelly this is not an option included in the current version of SpecTcl. That's why some device physicists prefer SpecTk for this type of tuning | * The two figures below show the spectrum **CRDC1.XG!FOI-AFP-BFP** before (top) and after (bottom) the dispersion-matching tuning for a typical experiment. Be aware that the width given by SpecTcl for the selected peak is not too reliable. It is more convenient to do a real gaussian fit. Unfortunatelly this is not an option included in the current version of SpecTcl. That's why some device physicists prefer SpecTk for this type of tuning | ||
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* Reaction setting to FP | * Reaction setting to FP | ||
* Start with Attenuator setting of unreacted beam and step up in intensity | * Start with Attenuator setting of unreacted beam and step up in intensity | ||
- | * Set up beam blocker, | + | * If necessary, set up beam blocker |
+ | * Click on label **I255 Slits** in the S3 page of Barney | ||
+ | * Expected " | ||
* Expect to see unreacted beam if reaction setting is within +/- 3% of unreacted beam setting | * Expect to see unreacted beam if reaction setting is within +/- 3% of unreacted beam setting | ||
* Should have to move only one of the two blockers unless charge states are present | * Should have to move only one of the two blockers unless charge states are present | ||
- | * A graphic tool is available to help (not yet calibrated) | ||
* Try to cut only as much as necessary; depends on | * Try to cut only as much as necessary; depends on | ||
* What rate limits allow | * What rate limits allow | ||
* What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime) | * What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime) | ||
* Move blocker, decrease attenuator, repeat | * Move blocker, decrease attenuator, repeat | ||
+ | |||
+ | * If necessary, do the ToF corrections to improve the PID resolution (instructions [[During experiments# | ||
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* The auxiliary detector provides a secondary trigger that is fed into the S800 trigger system | * The auxiliary detector provides a secondary trigger that is fed into the S800 trigger system | ||
* A key part of setting up the S800 for such experiments is getting proper timing setup between the S800 and any auxiliary detectors | * A key part of setting up the S800 for such experiments is getting proper timing setup between the S800 and any auxiliary detectors | ||
- | * For cases where the Secondary detector has a slow response relative to the S800, the coincidence timing must be reset to the S800 timing by delaying the S800 trigger using the third gate and delay generator on the trigger GUI | + | * For cases where the Secondary detector has a slow response relative to the S800, the coincidence timing must be reset to the S800 timing by delaying the S800 trigger using the third gate and delay generator on the |
* A typical S800 delay for SeGA is 450 ns | * A typical S800 delay for SeGA is 450 ns | ||
* Probably smaller typical S800 delay needed for HiRA | * Probably smaller typical S800 delay needed for HiRA | ||
* An example of experiments where auxiliary detectors are not used and, thus, setting up coincidence timing is not an issue are the experiments with tritons run by the charge exchange group | * An example of experiments where auxiliary detectors are not used and, thus, setting up coincidence timing is not an issue are the experiments with tritons run by the charge exchange group | ||
- | * It is not clear whether coincidence setup gets logged as “XDT” or “EXR” | + | |
* Choice of setting to be used for coincidence timing setup | * Choice of setting to be used for coincidence timing setup | ||
* The reaction of interest for the experiment can be used to setup coincidences only if the rate of coincidences is high enough | * The reaction of interest for the experiment can be used to setup coincidences only if the rate of coincidences is high enough | ||
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* Setup | * Setup | ||
- | * Coincidence signals are usually visible on scope without running scope in acquire mode | + | * Using the [[S800 DAQ tools# |
+ | * Assign each wire to an inspect channel from the patch panel so that you can check their timings | ||
* Adjust the width of the early signal (S800 or secondary) should be wide enough to catch coincidences with the late signal (width of late signal is not critical) | * Adjust the width of the early signal (S800 or secondary) should be wide enough to catch coincidences with the late signal (width of late signal is not critical) | ||
* Readjust TDC delays based on changes made to S800 trigger delay | * Readjust TDC delays based on changes made to S800 trigger delay | ||
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* This check is required for verification in cases of low beam intensity (e.g. 1000 pps) | * This check is required for verification in cases of low beam intensity (e.g. 1000 pps) | ||
* Length of run required is typically about 10-15 minutes | * Length of run required is typically about 10-15 minutes | ||
- | * To be resolved: | + | |
+ | |||
+ | |||
+ | {{: | ||
+ | |||
* Sample timing for running S800 with SeGA | * Sample timing for running S800 with SeGA | ||
* SeGA trigger is late with respect to S800 trigger | * SeGA trigger is late with respect to S800 trigger | ||
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- | |||
- | |||
- | ====== Follow-up ====== | ||
- | |||
- | * Before leaving beam with experimenters | ||
- | * Set up current trip points on Linux HV controls | ||
- | * Values used for K-48 | ||
- | * 5 for CRDC and Ion Chamber anodes and intermediate image ppacs | ||
- | * 50 for CRDC drifts | ||
- | * 80 for IC drift | ||
- | * Ensure alarms are running | ||
- | * Make sure Linux HV GUI alarms are enabled | ||
- | * Make sure threshold on isobutane level is set up (not currently connected to alarms because they give too many false alarms when communication is lost) | ||
- | * All logs are being recorded | ||
- | * There is no log file for biases controlled by Labview | ||
- | * Linux HV | ||
- | * LabView gas handling system | ||
- | * Note in logbook | ||
- | * Scintillator biases | ||
- | * IC gate biases | ||
- | * Post reference printouts for experimenters | ||
- | * HV status: a snapshot of HV GUI | ||
- | * Gas handling system status: a snapshot of LabView window | ||
- | |||
- | * Create window configuration with summing regions to make it easier for experimenters to track efficiency/ | ||
- | |||
- | * Setting up coincidences for additional reaction settings in an experiment | ||
- | * Do not need to redo coincidence settup if secondary beam does not change | ||
- | * Might need to redo coincidence setup if secondary beam changes drastically | ||
- | |||
- | * To watch during experiment | ||
- | * Look for isobutene running out – messes up data over several hours | ||
- | |||
- | * Implementing dE- or TOF-based corrections is part of EXR | ||
- | |||
- | More detail needed | ||
- | Minimum rates required for coincidence setup | ||
- | Selection of appropriate substitute reactions for coincidence setup | ||
- | How to feel comfortable that there will not be a problem with FP detector gases running out | ||
- | Starting alarms | ||
- | Starting logging | ||