Difference between revisions of "Engineering Run"

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* Whenever preparing to receive beam, make sure the following conditions are established: all CLAS12 detectors are off and target is empty. For SVT, MVT, FTH and FTT, turn first HV off and then LV off. For any problem, consult with the expert-on-call.
 
* Whenever preparing to receive beam, make sure the following conditions are established: all CLAS12 detectors are off and target is empty. For SVT, MVT, FTH and FTT, turn first HV off and then LV off. For any problem, consult with the expert-on-call.
−
* Continue the beamline commissioning following the instructions described in [https://wiki.jlab.org/clas12-run/images/7/74/CLAS12_beamline_commissioning.pdf]:
+
* Establish beam to the tagger yoke first:
 +
*# ask MCC to energize the tagger dipole magnet and set the current as needed
 +
for dumping the beam in the designated dump on the tagger yoke. MCC will
 +
ask you to change (set) the beam delivery mode.
 +
*# position the \blank" collimator on the beam (this is a collimator block, 30 cm
 +
long Ni cylinder, without a hole)
 +
*# when the tagger magnet is at required setting ask MCC if they are ready to
 +
deliver beam to the tagger yoke dump (<=5 nA). It may take ~1 hour for MCC to setup and cleanly transport beam to the
 +
tagger yoke dump,
 +
*# perform harp scans using the wire harp at 2C21 girder and 2c24 (tagger harp). Beam profile, peak position, width and signal/background ratio should be like in https://logbooks.jlab.org/entry/3502250 and https://logbooks.jlab.org/entry/3502252. Ask MCC
 +
to retune if needed (e.g. beam is too wide or asymmetric or has large tails),
 +
repeat the scan after every tune. Iterate to get acceptable beam profile.
 +
* send the beam to Faraday Cup dump (otherwise known as electron dump).
 +
#* CLAS12 detectors should be OFF, the solenoid magnet current is at 50%
 +
its max, torus is at 100%.
 +
#* ask MCC to degauss and turn the tagger dipole off;
 +
#* position 20 mm collimator on the beam and move \Chromox" screen of
 +
the downstream viewer in beam position (if it is not already)
 +
 
** establish beam to the faraday cup: beam current should be 1.5 nA, positions, quads settings and rates should be as in https://logbooks.jlab.org/entry/3502318;
 
** establish beam to the faraday cup: beam current should be 1.5 nA, positions, quads settings and rates should be as in https://logbooks.jlab.org/entry/3502318;
 
** make sure beam is stable and beam spot is clearly visible on the chromax viewer;
 
** make sure beam is stable and beam spot is clearly visible on the chromax viewer;

Revision as of 17:53, 11 December 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 Engineering Run, Fall 2017
Beam energy 10.6 GeV (5 pass)
Important: Document all your work in the logbook!

RC: Raffaella DeVita

  • (757) 575-7540
  • 9 575 7540 from Counting Room
  • devita@jlab.org

PDL: Eugene Pasyuk

  • (757) 876-1789
  • 9 876-1789 from Counting Room
  • pasyuk@jlab.org

Run Plan: beamline commissioning

  • Whenever preparing to receive beam, make sure the following conditions are established: all CLAS12 detectors are off and target is empty. For SVT, MVT, FTH and FTT, turn first HV off and then LV off. For any problem, consult with the expert-on-call.
  • Establish beam to the tagger yoke first:
    1. ask MCC to energize the tagger dipole magnet and set the current as needed

for dumping the beam in the designated dump on the tagger yoke. MCC will ask you to change (set) the beam delivery mode.

    1. position the \blank" collimator on the beam (this is a collimator block, 30 cm

long Ni cylinder, without a hole)

    1. when the tagger magnet is at required setting ask MCC if they are ready to

deliver beam to the tagger yoke dump (<=5 nA). It may take ~1 hour for MCC to setup and cleanly transport beam to the tagger yoke dump,

to retune if needed (e.g. beam is too wide or asymmetric or has large tails), repeat the scan after every tune. Iterate to get acceptable beam profile.

  • send the beam to Faraday Cup dump (otherwise known as electron dump).
    • CLAS12 detectors should be OFF, the solenoid magnet current is at 50%

its max, torus is at 100%.

    • ask MCC to degauss and turn the tagger dipole off;
    • position 20 mm collimator on the beam and move \Chromox" screen of

the downstream viewer in beam position (if it is not already)

    • establish beam to the faraday cup: beam current should be 1.5 nA, positions, quads settings and rates should be as in https://logbooks.jlab.org/entry/3502318;
    • make sure beam is stable and beam spot is clearly visible on the chromax viewer;
    • with the support of the beamline expert, set FSD thresholds to trigger the beam shutdown in case rates become too high;
    • check the effect of the solenoid on the beam position by ramping from the present 50% to 100%: to do that ask E. Pasyuk (PDL phone) to do it or to give you directions; save the snapshot of the main gui in the logbook;
    • check the effect of the torus on the beam position by ramping from the present 0% to 100%: to do that ask E. Pasyuk (PDL phone) to do it or to give you directions; save the snapshot of the main gui in the logbook;
    • move the beam position at 2H01 by +/-2 mm in x and y in steps of 0.5 mm to ensure we are reasonably centered at the target; record rates from halo counters and BOM; stop the scan as soon as a significant increase of the rates is detected; while doing this, monitor the SVT leakage currents (detector is off) and make sure the currents do not increase significantly from the no-beam values; define the final beam positions based on the spot with the lowest rates;
    • turn on the forward carriage detectors: EC, PCAL, FTOF; check rates and record them in the logbook;
    • start the DAQ (consult with the DAQ expert) and start the online monitoring, CED and CLAS12MON;
    • prepare to fill the target (consult with Engineering on call).
    • whenever beam is off but Hall C has beam, checks rates and beam current monitor readings looking for possible bleedthrough.


Important Notes:

  1. During beam tune and harp scans Hall-B halo FSD must be masked.
  2. The main lights in the Hall(dome lights) and the Forward Carriage lights are being kept off because of light leaks affecting some of the detectors. If these lights are switched on during an access, they should be switched off when leaving the Hall. Note that the dome lights when switched off cannot be turned back on immediately because they require 10-15 min to cooldown."
  3. 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.
  4. If DAQ crashed/broken: Follow instruction on Documentation tab. If cannot resolved in 20-30 min call DAQ on-call cell phone.
  5. 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



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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