Difference between revisions of "The HPS Run Wiki"

Revision as of 22:49, 6 February 2016

Procedures

Commissioning Plans:
- Beamline
- Trigger
- ECal
- SVT
SVT TOSP (1,2,3)
Tunnel/Hall Access
Power Failure

Manuals

Harp Scans
Beam Trip Runs
SVT
ECal (Annex)
DAQ
Beamline
- Turning Chicane ON/OFF
- Chicane Settings
Slow Controls

JLab Logbooks

HPS 2016 run, February 4 to March 14, weekends only. Shifts are manned from Friday 3pm to 7am on Monday. Beam energy 2.3 GeV (1 pass). Important: Document all your work in the logbook!

RC: Stepan Stepanyan (Bluejeans info for Run Meetings on Thursdays and Fridays at 3pm)

(757) 575-7540
9 575 7540 from Counting Room

PDL: Harut Avagyan

Run Plan for February 5 - 7, 2016:

Bringing beam to the hall (consult with RC with any problem):

Follow the instructions under "Procedures" on the documentation tab for "Beamline"[1] 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.
- Before moving forward with 2H02A harp scans and beam profile tune, stripline BPMs 2H00 and 2H02 must be calibrated and orbit lock must be operational. At the moment 2H00 does not work and calibration of both is in question. Expert has been called in. If issue will not be resolved, still some parts of the program below can be executed if beam is not moving round much (can be manually controlled for slow drifts).+
The required beam profile at 2H02A harp is: X-width <~0.25 mm, Y-width <~ 0.05 mm, and the tilt angle <15 degrees. Michael T. will come to work on improving Hall-B beam profile. If after few hours (before midnight) settle on some reasonable configuration when HPS-l/R are few 100 Hz. If beam profile is not exactly as required, but beam positions on 2H02 BPM are stable within 0.2 mm in X and 0.1mm in Y, the following still can be done:
- 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 - rememebr BPM readings are in mm, collimator steps are in inches.
- Mark the beam position on the chromox screen and turn on HPS chicane magnets.
- Study rates on ECal channels as a function of beam current without and with production target. Do not exceed 1.3 MHz rate in an individual ECal channel.
- Check the FSD system (see procedures on the Documentation page). Call Rafayel Paremuzian.
- Check fast beam motion using struck scaler system. Call Rafayel Paremuzyan.
If beam stability and profile are acceptable, start centring it on HPS SVT using SVT wires (see instructions under "Procedures" on the documentation tab for "Beamline").
Start trigger rates studies, establish running conditions.

Miscellaneous Notes:

If you change beam current, turn orbit locks off first, there is a current - position dependence on the stripline BPMs 2H00 and 2H02
Do NOT change chicane magnet currents when beam is on
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.

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.
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 completely OFF (see above)
- 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"[2]. To tune the beam establishing on the 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 ([3],[4]). 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 ~10Hz/nA [5]
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"[6] 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)
- Tune beam profile with 2H02A harp scan to be wide in X-direction and narrow in Y (see ref [7])
- Check the beam spot on chromax viewer
- The halo counter rates before HPS must be low:
  1. UPS-L and UPS-R few Hz/nA,
  2. The tagger counters should count less than Hz/nA and downstream counters should count ~Hz/nA
  3. 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 [8]
- Positions on BPMs must be close to what they were before [9]
- 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.
  1. Retract the SVT to its 1.5 mm stations, both top and bottom.
  2. Tell MCC we are ready for beam.
  3. Once beam is restored, confirm that both 2H02 beam positions x and y are as desired and halo counter rates are as expected.
  4. Once beam is stable for ~1 minute, restore SVT HV and the SVT to its nominal position.
  5. 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.

Setting up Chicane for E=2.3 GeV:

Note: This requires Beam Permit and NO beam to HPS / Faraday Cup.

Turn on chicane power supplies following instructions on the documentation page on [10]

SVT Instructions:

Turn SVT completely OFF (Bias, FEB, Flange) when entering Beam Permit.
Before sending beam to Faraday cup, verify (and page SVT expert if otherwise):
- SVT should be open: "Position" at 0.000 mm in the main scaler_hps GUI
- SVT HV is off: all red/green indicators RED in SVT bias GUI
The first time sending beam to the Faraday cup after the hall is closed, page the SVT expert.

ECAL 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.

@@ Line 105: / Line 105: @@
 # Follow the instructions under "Procedures" on the documentation tab for "Beamline"[https://wiki.jlab.org/hps-run/images/e/e6/HPS_beamline_comm.pdf] to establish beam to the electron dump. <b> Note: in order to have reliable readings on two important for HPS BPMs, 2H00 and 2H02, beam current should be >25 nA</b>. All studies should be done with beam currents between 25 nA and 30 nA.
 #* <b> Before moving forward with 2H02A harp scans and beam profile tune, stripline BPMs 2H00 and 2H02 must be calibrated and orbit lock must be operational.</b> At the moment 2H00 does not work and calibration of both is in question. Expert has been called in. If issue will not be resolved, still some parts of the program below can be executed if beam is not moving round much (can be manually controlled for slow drifts).+
-# The required beam profile at 2H02A harp is: X-width <~0.25 mm, Y-width <~ 0.05 mm, and the tilt angle <15 degrees. Michael T. will come to work on improving Hall-B beam profile. If after few hours (before midnight) settle on some reasonable configuration. If beam profile is not exactly as required, but beam positions on 2H02 BPM are stable within 0.2 mm in X and 0.1mm in Y, the following still can be done:
+# The required beam profile at 2H02A harp is: X-width <~0.25 mm, Y-width <~ 0.05 mm, and the tilt angle <15 degrees. Michael T. will come to work on improving Hall-B beam profile. If after few hours (before midnight) settle on some reasonable configuration when HPS-l/R are few 100 Hz. If beam profile is not exactly as required, but beam positions on 2H02 BPM are stable within 0.2 mm in X and 0.1mm in Y, the following still can be done:
 <!-- #* Verify positions and sizes of SVT protection collimator holes as assigned on the GUI. Move collimator with steps of 0.1 mm and record rates on HPS-L/R/T/SC halo counters. Find the optimal position based on rates.
 #* Center beam on HPS using ECal rates (see instructions under "Procedures" on the documentation tab for "Beamline"[https://wiki.jlab.org/hps-run/images/e/e6/HPS_beamline_comm.pdf]). -->
+#* 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 - rememebr BPM readings are in mm, collimator steps are in inches.
 #* Mark the beam position on the chromox screen and turn on HPS chicane magnets.
-#* Study rates on ECal channels  as a function of beam current without and with production target.
+#* Study rates on ECal channels  as a function of beam current without and with production target. Do not exceed 1.3 MHz rate in an individual ECal channel.
-#* Check the FSD system (see procedures on the Documentation page)
+#* Check the FSD system (see procedures on the Documentation page). Call Rafayel Paremuzian.
+#* Check fast beam motion using struck scaler system. Call Rafayel Paremuzyan.
 # If beam stability and profile are acceptable, start centring it on HPS SVT using SVT wires (see instructions under "Procedures" on the documentation tab for "Beamline").
 # Start trigger rates studies, establish running conditions.

System/Person	Pager/Phone Number
Run Coordinator	(757) 575-7540 (cell)
Physics Div. Liaison	(757) 876-1789 (cell)
MCC-OPS	7048
Crew Chief	7045
Crew Chief	9-879-3367 (cell)
Program Deputy	9-876-7997 (cell)
Gate House Guard	5822
DAQ/Online	(757) 869-2188 (cell)
SVT	(757) 541-7539 (cell)
ECAL	(757) 810-1489 (cell)
Slow Controls	(757) 748-6922 (cell)
Beamline	(757) 303-3996 (cell)
Engineering	(757) 748-5048
Hall-B Floor	5165
Hall-B Space Frame	5170, 5171
Hall-B Forward Carriage	5371
Hall-B Counting Room	5126, 5244, 5246, 5247
Hall-B Gas Shed	7115