Difference between revisions of "KPP Run"

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# Reverse torus polarity, <b> Set point = -1900 A </b>. First ramp down torus to zero, by setting 0 in the set point, then ramp up to -1900 A.
 
# Reverse torus polarity, <b> Set point = -1900 A </b>. First ramp down torus to zero, by setting 0 in the set point, then ramp up to -1900 A.
 
# Take data with reverse field, Sector-2 only, high EC-inner threshold
 
# Take data with reverse field, Sector-2 only, high EC-inner threshold
−
# After the run meeting (~4:00pm) Perform beam studies (call RC and beamline, <b> Turn off DC HV </b>):
+
# Study tracking efficiency: four HV setings: 8, 9, 10, 11, 12, for each HV four threshold settings: 30, 45, 60, 75. 10 min runs each.
 +
# After the run meeting (Sunday) Perform beam studies (call RC and beamline, <b> Turn off DC HV </b>):
 
#*<del>Do harp scans - 2C21, "tagger", and 2H01</del> done while changing the torus setting  
 
#*<del>Do harp scans - 2C21, "tagger", and 2H01</del> done while changing the torus setting  
 
#*<del>Run 2H01 at low speed (speed=0.1) to 13.3 position and save strip chart of motor position together with downstream halo counters</del> done while changing the torus setting, the first carbon target was found at ~10.6
 
#*<del>Run 2H01 at low speed (speed=0.1) to 13.3 position and save strip chart of motor position together with downstream halo counters</del> done while changing the torus setting, the first carbon target was found at ~10.6

Revision as of 14:46, 4 February 2017

[edit]
Role Phone Number
Hall B Run Coordinator (757) 575-7540 (cell)
Hall B Physics Division Liaison (757) 876-1789 (cell)
MCC 7048
Crew Chief 7045
Crew Chief (757) 876-3367 (cell)
Program Deputy (757) 876-7997 (cell)
RadCon (757) 876-1743 (cell)
Gate House Guard 5822
Location Phone Number
Hall B Floor 5165
Hall B Space Frame 5170 and 5171
Hall B Forward Carriage 5371
Hall B Gas Shed 7115
Hall B Counting House 5244 (Shift Expert)
Hall B Counting House (757) 329-4846 (Shift Expert cell)
Hall B Counting House 5245 or 5126 (Shift Worker)
Hall A Counting House 5501
Hall C Counting House 6000
Hall D Counting House 5504
Hall B System Phone Number On-Call Person
Engineering (757) 748-5048 (cell)
(757) 897-9060 (cell)		 Engineering On-Call (primary)
Denny Insley (secondary)
Slow Controls (757) 748-6922 (cell) Nathan Baltzell
Beamline (757) 303-3996 (cell) Eugene Pasyuk
DC (757) 218-4372 (cell)
(757) 748-5048 (cell)		 Florian Hauenstein (primary)
Engineering On-Call (secondary)
SVT/MVT/MM (757) 541-7539 (cell)
(757) 753-7769 (cell)		 Yuri Gotra (primary)
Rafo Paremuzyan (secondary)
ECAL (757) 810-1489 (cell) Cole Smith
FTOF/CTOF/CND (757) 344-7204 (cell) Daniel Carman
ALERT (757) 329-4844 (cell) Raphael Dupré
HTCC/LTCC (757) 344-7174 (cell) Youri Sharabian
FT (757) 344-1848 (cell) Raffaella De Vita
BAND (757) 310-7198 (cell) Florian Hauenstein
RICH (757) 344-3235 (cell)
(757) 748-6922 (cell)		 Christopher Dilks (primary)
Nathan Baltzell (secondary)
DAQ (757) 232-6221 (cell) Sergey Boiarinov
HYDRA (317) 550-9226 (cell) Torri Jeske
Authorized Hall B Solenoid/Torus Operators
Hall B Denny Insley, Morgan Cook, Eugene Pasyuk
Magnet Group Probir Ghosha, Renuka Rajput-Ghoshal
Detector Support Group Brian Eng, Pablo Campero, Tyler Lemon
DC Power Onish Kumar, Sarin Philip
  • Note, all non-JLab numbers must be dialed with an area code. When calling from a counting-house landline, dial "9" first.
  • To call JLab phones from outside the lab, all 4-digit numbers must be preceded by 757-269
  • Click Here to edit Phone Numbers. Note, you then also have to edit the current page to force a refresh.

Click Here to edit Phone Numbers. Note, you then also have to edit this page to force a refresh.


CLAS12 KPP run, February 3 to March 3
Beam energy 6.4 GeV (3 pass)
Important: Document all your work in the logbook!

RC: Stepan Stepanyan

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

PDL: Eugene Pasyuk

  • (757) 876-1789
  • 9 876-1789 from Counting Room

Run Plan for February 4-5, 2017 :

  • Target position 13.125 (2H01 harp, can be moved using button on the main scaler GUI or using the expert GUI)
  • Beam current 5 nA (use Faraday Cup)
  • Beam positons on 2H01 nA BPM x=0.4, y=1
  • CODA configuration - FC_DC
  • Triger file - trigger/kpp1.trg
  • Take data, 2 hours a run

Plan:

  1. Complete data taking with Sector-2 only, EC-inner high threshold (5000 fADC units)
  2. Reverse torus polarity, Set point = -1900 A . First ramp down torus to zero, by setting 0 in the set point, then ramp up to -1900 A.
  3. Take data with reverse field, Sector-2 only, high EC-inner threshold
  4. Study tracking efficiency: four HV setings: 8, 9, 10, 11, 12, for each HV four threshold settings: 30, 45, 60, 75. 10 min runs each.
  5. After the run meeting (Sunday) Perform beam studies (call RC and beamline, Turn off DC HV ):
    • Do harp scans - 2C21, "tagger", and 2H01 done while changing the torus setting
    • Run 2H01 at low speed (speed=0.1) to 13.3 position and save strip chart of motor position together with downstream halo counters done while changing the torus setting, the first carbon target was found at ~10.6
    • Test FSD system, run Struck scaler with 300um dwel time, ask MCC to set FSD trip time integration times for FSD channels (1 old and 3 new) to 1 ms. Un-mask one FSD channel, run collimator with slmall steps to left or right untill it will intercept beam tails. It will raise rateson halo counters.
  6. Continue data taking with reverse field till 9pm, Sector-2 only, high EC-inner threshold
  7. Change torus setting to positive polarity, 1900 A set point, continue data taking

Important Notes:

  1. During beam tune and harp scans Hall-B halo FSD must be masked.
  2. 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.
  3. If DAQ crashed/broken: Follow instruction on Documentation tab. If cannot resolved in 20-30 min call DAQ on-call cell phone.
  4. With any issue contact On-Call Experts or RC - do not spend more than 15-20 min trying to fix the problem.

General Instructions:

Locking up the hall

  • 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 (Tagger and Torus) are turned ON and in remote mode, LCW is on.
  • Make sure experts, beamline, ECal, DC, HTCC, FTOF, and slow controls, checked their systems before the lockup.
  • When ready notify MCC to start sweep and lockup of the hall.
  • Make sure all necessary monitoring GUIs are up and running.
  • Make sure beam viewer screens are up.
  • When hall is in "Beam Permit"
    • Ramp torus to 10% of max current (380A)
    • Turn tagger magnet ON if beam tune on the tagger dump or tagger yoke dump will be needed (it will be needed if beam comes back after several hours of down)
    • Turn all beamline devices ON, turn all CLAS12 detectors OFF

Establishing Acceptable Beam Conditions:

  1. Make sure CLAS12 is OFF When Beam is Turned For the First Time After long Down.
  2. First send beam to the tagger yoke dump:
    • Check that beam type is set to "Photon" (HPS_EPICS->Beam->BTA).
    • Ask MCC to turn ON the tagger magnet and then deliver <10 nA beam.
    • Follow instructions under "Procedures" on the documentation tab for Beamline Commissioning Plans. To tune the beam on tagger yoke 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 ([1],[2])
      • Positions on both harps should be within 1mm
      • Width on 2C21 should be <~0.1+/-0.05 mm
      • Width on tagger harp (2C24) <~0.5 +/- 0.1mm
  3. Send beam to the Faraday cup
    • If the beam optics is correct, then you should immediately see the beam spot on the Downstream Viewer
    • If you don't see it immediately, and rates on halo counters are more than 100 Khz, then ask MCC, to change to pulsed (tune mode) beam, and ask to put corrector values. At this point don't accept any CW beam, until beam spot is visible on Downstream Viewer.
    • If MCC operator is not able to tune the beam more than 30 minutes, then please notify RC
    • Tune beam profile at CLAS12 target using 2H01A harp. The required beam profile at 2H01A harp is: X-width <~0.3 mm, Y-width <~ 0.3 mm
    • Check and log the beam spot on chromax viewer
    • Check rates on halo counters
      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. Midstream counters few Hz/nA
    • Once all the above is achieved, turn first CLAS12 ECal HV ON and monitor and log ECal rates before bringing rest of the detector UP

Setting up the FSD threshold

  • When you are about to calculate FSD limit, it means the beam is already established, and the target is in.
  • To calculate the FSD threshold run the folloing executable
hpsrun@clonpc11> /home/hpsrun/scripts/FSD/Calc_FSD_Threshold.exe
  • Note we use 1 ms integration time, and want 5.5 sigma away from the average rates
  • Allowed tolerable rate increase default is 15%, if that causes many trips, then contact RC, he might suggest to increase that number
  • Make sure if MCC operator set the FSD limit and integration time correctly


Every Shift:

  1. Follow run plan as outlined by RC
  2. If any concern about beam stability, ask MCC if orbit locks are on (they should be).
  3. 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 out BTA hourly. Click "Load from EPICS" to automatically fill the left side.
    • Fill and submit the shift checklist in the logbook
  4. Perform 2H01A harp scan once per shift or when beam conditions have changed, based on beam monitors (BPMs, halo rates, beam-viewer). During harp scans the HV for DC and HTCC should be OFF.

Every Run:

  1. Log screenshots of:
    • main scaler GUI display
    • Detector occupancy plots
    • Trigger rate gui
    • Beam strip charts


Clas12design.png

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