Tuesday, Mar. 08: OWL Shift

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Previously...

• Production data (Kin48_3)

Specific mission

• • • Continue production mode ***

last update Mar 06

• Polarized beam at 15 uA on LH2 15 cm through Compton chicane !
• DVCS is running kin_48_3 [here], as off 03-06 5 pm we have accumulate 2.14 C out of our goal of 4.7 C.
• LHRS is partially detuned: [here]

- LHRS=2.92GeV, Q1/Q2/Q3=1916.640(readout:1900)/1600/1600 (Q1 regul.OFF)

- PreScaleR : PS1=PS2=PS3=1, && PS8=200

- PreScaleL : PS9 =1, + DVCS config.

• beam locks: no position lock, energy lock in Arc 2: [here]
• the straw chambers in the LHRS are ON !
• DVCS daq configuration is [this one], we are measuring about 2% DT at 15uA.
• Take Compton run every 2 h

Special Runs tonight Purpose: calorimeter resolution & the trigger efficiency

* 3 runs of 1h (total 3h) of production data at 5 uA 

- During these runs, Alex will set the trigger in autovalidation (effectively no coincidence trigger).
- He will do this at his home and communicate with the shift crew by phone
- Call Alex 5-10 min before the current (or next) run is finished, He will update the trigger configuration
- Then, take 3 runs at 5 uA
- Before the end of the 3rd run, call Alex who will update the trigger configuration again.
- Then return to 15 uA and continue production until the morning.

• • • Preparation Elastic measurement during DAY
• 6:30AM Call MCC for Controlled Access. Once beam is OFF, turn OFF magnet in LHRS (OWL SL SHOULD DO THIS !)
• 7:30AM Change polarity and angle of LHRS (detail info(angles) will be sent to Jessi by email)
• 8:30AM-1:30PM various DVCS angle calibrations with change Calo. distance(2.5/6/2m)(required multiple escorted access)
• 2:00PM Change polarity back and angle LHRS for production
• 3:00PM Resume production (15uA, LH2)

• • • Back to Production run, Kin48_2
  • After Alex's work, Compton laser will be turned OFF !
• Polarized beam at 15 uA on LH2 15 cm! (out of chicane ? )
• DVCS is running kin_48_2 [here]
• LHRS is partially detuned: [here]

- LHRS=3.996GeV, Q1/Q2/Q3=1916.640(readout:1900)/1600/1600 (Q1 regul.OFF)

- PreScaleR : PS1=PS2=PS3=1, && PS8=200

- PreScaleL : PS9 =1, + DVCS config.

• beam locks: no position lock, energy lock in Arc 2: [here]
• DVCS daq configuration is [this one], we are measuring about 2% DT at 15uA.

BPM/Spot++ Check

• After beam lost for considerable time (like beam study, pass change,...)
• Ask MCC to run 5uA wth carbon hole target and make sure you can see the hole through Spot++

• Beamline commissioning how-to.

Please check more info on the white board in the Counting House ~!!