Run Coordinator summary (Oct. 6 ~ Oct. 8)

keyword=Run Coordinator summary (Oct. 6 ~ Oct. 8)

RC report (Oct. 6 Owl shift ~ Oct. 8 Owl shift)

(This is my last RC report. Thanks a lot to all the people's efforts during my RC period to keep the experiment running)

Take production data till 1:30am. L-arm Q1 tripped and recovered by power cycling. Around 4;30am, RC was paged since L-arm dipole magnet tripped.
Jack also showed up and found that it could not be recovered immediately. Decided to run with R-arm only and left it till 8:00am.
Around 7:40am, all the magnets were down in both arms. Asked for a controlled access to fix the magnets.
At the same time, Rupesh did some tests for Happex3. There were also some PVDIS works in the hall.
Around 11:00am, R-arm HV kept tripping. Brad was paged and fixed it in the Hall.
Around 1:00pm, start beam recovery and check beam quality, then take production data with R-arm dipole ramping up.
Around 3:30pm, R-arm dipole was back. Start to take real production data.
From 5:30pm, Kent and Diancheng did some tests on compton electron detector.

During the Owl shift, keep taking producton data. BCM12 saturated a while, then came back to normal. Around 6:00am, Rupesh did some Det linearity tests.
Around 8:00am, Megan did some compton detector tests. Then start to take prodcution data around 10:00am.
Around 1:30pm, Kent and Jack went to the Hall and change the limit switch on compton electron detector.
Around 5:00pm, Move HWP in and start to take data for slug 20.
Around 6:30pm, Beam was dwon due to a CHL problem.
Around 10:00pm, beam was back. Check beam quality and start to take production data.
Around 11:40pm, beam was down due to a CHL problem again.

Still no beam when the Owl shift started. Rupesh and Megan asked for a controlled access to do some works in the Hall.
Around 3:00am, The works in the Hall were done and Hall went to beam permit.
Around 5:40am, Beam was back. Check beam quality and start to take production data.
Around 6:30am, Target temperature is unstable, fluctuating between 17.0K and 19.7K. Reboot target IOCs to get it stable.
Around 7:30pm, target JT value is very high, ~ 60, but the cryo flow rate is low, only 25.0g/s.
Paged target expert for help to make JT value and cryo flow rate reasonalbe. Target operator will put a HALOG for the reference in the future.

Coulombs So Far

Please always check online hists and compare them to the reference ones.
If you find something strange or wrong, please HALGO it so that the expert can check it.
Target Operator, please always check target PID system and strip plots to make sure all the systems work.
The cryo flow rate around 25.2g/s and JT value is around 55.5 since this is better for Lumi widths.
Please be patient when you adjust the JT value since it may take a few minutes to make the cryo flow rate stable.