Run Plan for February 12 - 15, 2016:
Start close-up of the Hall at ?? on ?? , May 1 (see "General instruction" on the right)
After hall is in "Beam Permit" turn on the chicane (see "Setting up Chicane for E=2.3 GeV" under "General instructions" on the right)
Establish beam to the tagger dump (see "General instruction" on the right)
Bring beam to FC:
- Note: in order to have reliable readings on two important for PRad, beam current should be > ?? nA. Before moving forward with 2H02A harp scans and beam profile tune, make sure orbit lock is engaged. For orbit lock positions on 2H00(X=~0.,Y=~0.). on 2H02(X=0.4,Y=-0.7). The new positions for collimator at this beam position are: 3.94 mm at 6.198, 2.82 mm at 5.03. (?? number for PRad). Due to higher rates on halo counters we will run with 3.94 mm collimator. . All studies should be done with beam currents between 25 nA and 30 nA.
- The required beam profile at 2H02A harp is: X-width <~0.25 mm, Y-width <~ 0.05 mm, and the tilt angle <15 degrees. Do not west too much time on beam tune, as long as rates on the halo counters are low - Downstream L/R/T/B and HPS-L/R <~few Hz/nA, and HP-SC < few x 10 Hz, the following program still can be done:
- Check rates on ECal - Turn ON Ecal and observe rates in modules close to the beam in Top and Bottom. If rates are too asymmetric (difference is larger than 30%) try to equalize or bring them close by moving the beam vertically from high rate module towards the low rate. Note, movement must be done according to 2H02 Y-position readings. SVT collimator must be positoned accordingly - remember BPM readings are in mm, collimator steps are in inches.
- Study rates on HyCal channels for (make a log entry of PRad GUI ? for each condition):
- as a function of beam current without and with production target (4 um W).
- for different collimators (3.94 mm, 2.82 mm, and 2.25 mm) without and with target
- Start trigger rates studies, establish running conditions (see instructions under "Procedures" on the documentation tab for "Trigger").
- Take parasitic data on fast beam motion using struck scaler system. Call ? Ashot ? if it is between 8am and 10pm.
- If beam stability and profile are acceptable:
Miscellaneous Notes:
- ?? Do not run more than 60 minutes above 30 nA without the beam blocker in front of Faraday cup. Put beam blocker in for long running at high currents.
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General Instructions:
Locking up the hall on Fridays
- At 2pm check the status of the activities in the hall and notify RC if there are potential delays for the lockup at 3pm.
- Work with the hall work coordinator (Doug Tilles or his designee) to make sure hall is ready for sweep at around 3pm: vacuum is good, magnet power supplies are turned ON and on remote, LCW is on.
- Make sure experts, beamline, ECal, SVT, 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:
- Make sure SVT is retracted and completely OFF
- 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
- Follow instructions under "Procedures" on the documentation tab for "Beamline"[1]. To tune the beam on tagger dump and perform harp scans beam current should be <10 nA.
- Check profile using 2C21 and tagger harp scans, and compare the positions and widths with previous scans ([2],[3]). 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 [4]
- Before sending beam to the Faraday cup
- Check that SVT protection collimator is on beam
- HPS target is OUT
- SVT is OUT (position 0 mm) and voltages are OFF
- ECal HV is OFF
- Send beam to the Faraday cup
- Follow the instructions under "Procedures" on the documentation tab for "Beamline"[5] to establish beam to the electron dump. Note: in order to have reliable readings on two important for HPS BPMs, 2H00 and 2H02, beam current should be >25 nA. All studies should be done with beam currents between 25 nA and 30 nA.
- Ask MCC to establish 25 nA beam with HPS orbit locks on (We need HallBHPSOrb not HallBOrb configuration). For orbit lock positions on 2H00(X=~0.,Y=~0.). on 2H02(X=0.4,Y=-0.7). The new positions for collimator at this beam position are: 3.94 mm at 6.198, 2.82 mm at 5.03. Due to higher rates on halo counters we will run with 3.94 mm collimator. .
- Tune beam profile at HPS using measured widths on 2H02A harp. The required beam profile at 2H02A harp is: X-width <~0.25 mm, Y-width <~ 0.05 mm, and the tilt angle <15 degrees.
- Check the beam spot on chromax viewer
- The halo counter rates before HPS must be low:
- UPS-L and UPS-R few Hz/nA,
- The tagger counters should count less than Hz/nA and downstream counters should count ~Hz/nA
- The halo counter rates on HPS, HPS-L/R/T/SC, depends on the collimator and HPS chicane settings, but should not be more than 100 Hz/nA [6]
- Positions on BPMs must be close to what they were before [7]
- Insert the 4um W 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 using scaler_hps GUI.
Recovering from beam trips when running SVT at 0.5 mm:
- SVT HV will trip off automatically
- Check the FSD GUI to see if high rates in the HPS halo counters generated the trip
- If it was not an HPS halo counter trip, MCC will restore the beam as usual (following their own instructions). As soon beam is back and stable, restore SVT HV.
- If it was an HPS halo counter trip, MCC will not restore the beam. Inform MCC that we will get back to them when we are ready for beam.
- Retract the SVT to its 1.5 mm stations, both top and bottom.
- Tell MCC we are ready for beam.
- Once beam is restored, confirm that both 2H02 beam positions x and y are as desired and halo counter rates are as expected.
- Once beam is stable for ~1 minute, restore SVT HV and the SVT to its nominal position.
- Resume data taking.
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 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:
- After "Prestart" but before "Go", Check ECal Latency
- After "Go": Check SVT Occupancy
- Update the run spreadsheet on Google Docs.
- See the whiteboard for everything else that should be done on a per-run basis.
CODA Instructions:
- First open a terminal type : ssh pradrun@prad use the username:pradrun , password: pradtocome
- then at home directory ,do: ~/source SourThisForCoda.csh [Enter]
- open a new terminal to start the msqld, do: ~/ msqld [Enter]
- open a new terminal to start the rcplatform, do: ~/rcplatform [Enter]
- open a new terminal to start the coda, do:
- ~/codamaster [Enetr] choose "pradrun" configuration,then enable botton for et,eb,and er,then hit runcontrol.
- in CODA Gui, hit connect button then hit configure button, then hit download,then hit prestart, then hit go button, now it should start taking data.
- if you re-start et , please do: ~/ rm /tmp/et_sys_PRad01 before you start the CODA.
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.
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