Run Plan for May 13 - June 20, 2016:
Units are PAC days
- Photon Beam Tuning (~1 day)
- HyCal with GEM on Transporter and off the beam line;
- Target cell off the beam line;
- Tagger radiator off, collimator off;
- Tagger magnet on (for Ee = 2.2 GeV).
- establish a good electron beam (Ee = 2.2 GeV, Ie = 5 nA) on the tagger dump;
- take electron harp scans 2C21A and 2C24A, check the position, widths and peak to tails ratio;
- study beam halo by setting the harp wire in the tail region and ramping beam current up to 100 nA;
- lower beam current to 0.1 nA
- insert radiator 10-5 r. l.;
- check tagger counter scalars;
- setup MOR logic for calibration (gain equalizing) trigger T5 only;
- HyCal Gain Equalizing, GEM efficiency measurements (~2.5 days)
- establish HyCal temperature to T=16o and keep it stable;
- collimator in, 6.4 mm;
- target cell off the beam;
- HyCal is in “Bottom Right” position;
- 1”x1“l scintillator counters are installed in the beam line just after the Vacuum box and surveyed;
- establish good timing for the beam scintillator counters (record TDCs and ADCs for them)
- establish good timing for the HyCal readout;
- establish good timing for the GEM readout;
- adjust trigger delays, if necessary;
- set the gain value: E=2 GeV to ADC=4000 channel;
- start the gain equalizing process: scan to each module’s center, show the anode and dynode ADC distributions on the computer screen, by changing the HV set anode ADC=4000 channel (with ~ 5% precision), record the dynode signal value, save the HV, ADC and anode/dynode ratio, store the data from GEM, HyCal and trigger scintillator detectors;
- repeat part (k) for all HyCal modules (~15 hours).
- HyCal Gain Calibration, GEM efficiency measurements (~3.0 days):
- run HyCal with HV unchanged for ~ 3 hours after the “Gain Equalizing” in the part #2;
- the beam and the beam line are the same as in the part #2 “Gain Equalizing”;
- tagger trigger: all T1-T19 tagger counters and several T-counters from the middle part, DAQ readout without the “sparsification” option;
- start from the “Top Left” position and with a continuous motion (~0.3 min/module) “illuminate” all modules, store the data (HyCal + GEM) with the HyCal’s X,Y positions from EPICS;
- stop the HyCal motion by the end of each row, make new DAQ run with pedestals and LMS, store the files;
- repeat item (e) for all rows of HyCal, and store the data;
- run on-line calibration programs for the gain constants, store the data.
- Setup configuration, change from calibration to run:
- HyCal is off from the Transporter to the run cart, assembling the beam line, check the vacuum levels in the beam line, engineering survey (~4 days).
- Request for the Beam Energy Change to Ee = 1.1 GeV (0.5 day, during the same time).
- Electron Beam Tuning and Target Commissioning (~4 days)
- target cell off the beam line, no gas flow in the cell and chamber;
- collimator out;
- set threshold energy for the HyCal trigger E ~ 0.5xEe ;
- request electron beam (E = 1.1 GeV, I = 1 nA);
- take harp scans 2C21A, 2C24A and 2H01, check position and widths, establish a good electron beam and fix the beam line parameters;
- record HyCal trigger rate with no cell and no gas flow, take one short DAQ run (GEM+HyCal);
- electron beam off; insert the target cell in the beam line, still empty, ask for the beam back;
- target cell is empty (no gas flow into the cell and chamber);
- record HyCal trigger rate, take one short DAQ run;
- gas flow in the cell (Pcell = 6 torr, Pcham = 5 mtorr);
- record HyCal trigger rate, take one short DAQ run;
- move the cell on X-axis by +/- 3 mm with 0.2 mm steps and record the HyCal rate;
- move the cell on Y-axis by +/-3 mm with 0.2 mm steps and record the HyCal rate;
- change the cell angles and record the HyCal rate, get optimal cell direction;
- center the cell in the beam line based on those measurements;
- no gas flow into the cell and chamber, record the HyCal rate;
- gas flow into the cell (Pcell = 6 torr, Pcham = 5 mtorr);
- record HyCal trigger rate, take one short DAQ run;
- gas flow into the chamber only (Pcell = Pcham = 5 mtorr);
- record HyCal trigger rate, take one short file with ADCs (in-beam residual gas effect);
- If there is no sizable effect between cell in/out, skip following steps.
- beam off, 12.7 mm collimator in, target cell in, ask for beam;
- no gas flow in cell, record HyCal rate;
- gas flow in the cell (Pcell = 6 torr, Pcham = 5 mtorr), record HyCal rate;
- beam off, insert 6.4 (?) mm collimator in, take beam and repeat items (w) and (x);
- make a decision about the size of the collimator.
- Data taking with Ee = 1.1 GeV (5 days)
- beam intensity: Ie = 10 nA;
- collimator in (with the diameter defined in 5 (z);
- HyCal trigger is set, DAQ is ready, all slow control readout is ready;
- target cell in with maximum density (2.x1017 H/cm3);
- take data for 2 days, record all information on disk and on tape;
- no gas in the cell, take data for 0.5 day (empty target run);
- gas in the cell, run for 2 days (same as in (e));
- no gas in the cell, take data for 0.5 day (empty target run);
- REQUEST FOR Beam Energy CHANGE to Ee = 2.2 GeV (0.5 day)
- Data taking with Ee = 2.2 GeV (6 days)
- intensity: : Ie = 10 nA;
- collimator in (with the diameter defined in 5 (z);
- HyCal trigger is set, DAQ is ready, all slow control readout is ready;
- target cell in with maximum density (2.x1017 H/cm3);
- take data for 2 days, record all information on disk and on tape;
- no gas in the cell, take data for 0.5 day (empty target run);
- gas in the cell, run for 2.0 day (same as in (e);
- no gas in the cell, take data for 0.5 day (empty target run).
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General Instructions:
Locking up the hall (3:00 pm)
- At (4:00)pm check the status of the activities in the hall and notify RC if there are potential delays for the lockup at (4:00pm)
- Work with the hall work coordinator (Doug Tilles or his designee) to make sure hall is ready for sweep : vacuum is good, magnet power supplies are turned ON and on remote, LCW is on.
- Make sure experts, beamline, HyCal, GEM, and slow controls, checked their systems befor the lockup.
- When ready notify MCC to start seep and lockup of the hall.
- Make sure all necessary monitoring GUIs are up and running.
- Make sure beam viewer screens are up.
Acceptable Beam Conditions:
- To establish good beam conditions:
- First send beam to the tagger dump (ask MCC to turn ON the tagger magnet).
- Check that beam type is "Photon" on the BTA GUI (can be opened from "Beam" GUI).
- Check the beam position on the tagger viewer, it should be approximately in the centre of the screen
- Check profile using 2C21 and tagger harp scans, and compare the positions and widths with previous scans ([logbook link to be added]). Positions on both harps should be with +/- 1mm, widths on 2C21 should be <~0.1+/-0.05 mm, and on the tagger harp (2C24) <~0.35 +/- 0.1mm.
- Halo counters UPS-L/R and TAG-L/T/T2 should be ~few Hz/nA [logbook link to be added]
- Check HyCal HV is On
- Send beam to the Faraday cup
- Tune beam profile on (2H02A harp ? ). The required beam profile at (2H02A harp)? is: X-width <~ ?? mm, Y-width <~ ?? mm.
- Check the beam spot on chromax viewer
- Positions on BPMs must be close to what they were before [logbook link to be added]
- Insert the target without turning off the beam. ??
- Before accepting beam, make sure all the previous conditions are met. Always read previous log entries, compare settings of BPMs and correctors with previous settings.
Every Shift:
- Follow run plan as outlined by RC
- If any concern about beam stability, ask MCC if orbit locks are on (they should be).
- Keep shift summary up to date in HBLOG. Record all that happens.
- Check on white board all scalers, strip charts and monitoring plots that need to be logged regularly
- Document any beam condition change and send scaler GUIs to HBLOG
- Fill and submit the [logbook link to be added, shift checklist in the logbook]
- Perform 2H02A harp scan once per shift or when beam conditions have changed, based on beam monitors (BPMs, halo rates, beam-viewer)
- With any issue contact On-Call Experts or RC
Every Run:
- Be sure LMS phase number is 1 (can be seen on camera :hallbcam09.jlab.org, you can manually change the LMS phase)
- LMS phase number will automatically change to 2 after taking 20,000 events.
- Record LMS phase number once during taking the physics events (event number > 30,000 on CODA).
- Record any LMS phase change during the production run, and manually change the LMS phase to an even number (2, 4, 6).
- After "Prestart" but before "Go", (to be added )
- After "Go": (to be added)
- Update the run spreadsheet on [logbook link to be added].
- See the whiteboard for everything else that should be done on a per-run basis.
CODA Instructions:
- On clonpc14, open a terminal, check if EXPID and SESSION is set correctly.
- >echo $EXPID (should return prad)
- >echo $SESSION (should return clasprad)
- reset the two variables if they are not correct
- >setenv EXPID prad
- >setenv SESSION clasprad
- open run control "runcontrol -rocs"
HyCal Instructions:
- HV must be OFF during FIRST delivery of beam to the Faraday Cup after tuning to the Tagger Dump.
- Only after stable beam established to Faraday Cup can HV can be turned ON.
- HV should be OFF when running beam studies with Struck scalers with 1 mm wire or tuning collimator position.
- HyCal HV control
- ssh pradrun@prad , type: primexHV , password is PUs&r.
Online monitoring Instructions:
- HyCal online monitor
- on clonpc15 , type : cd PRad/PRadEventViewer/ [Enter].
- then type: source setup_env_prad.csh [Enter], then: type: ./PRadEventViewer [Enter].
- now you should see the GUI of online monitor, at menu choose online mode -> start online mode
- GEM Online Monitor
- GEM Online Monitor is installed on clonpc13, locate this pc, you should see the label at the bottom side of one Screen Monitor.
- go to : ~/PRad/GemView/
- then: source set_env.csh
- then: ./GemView
- There will be two GUI windows, first one for all individual APVs, on this window, there are 72 separate histograms; the second one for the decoded hit information.
- Gem APV online monitor
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