Owl shift summary April 2nd 2012

SL: Alexandre Camsonne
TO: Pengjia Zhu
3rd: Paul Gueye

0:00 Shift switch over Run 3600 / 22630.
0:22 Helium level low - Red alarm
0:33 Beam off for target baseline measurement - Microwave off
0:36 Helium level too high - Target Yellow alarm - Pengjia close Helium flow until baseline measurement is done.
0:54 HWP IN
1:04 to 1:35 Beam steering to resume board positions
2:00 CODA stuck - 3604-3606 Junk - Restart CODA
2:27 Karl calls in and wants prescale 1, Dead time is 30 %
4:12 Set momentum to 1.1594 GeV/c
4:16 Q2 turns off by itself. Turn back on and cycle to 1400 A
4:58 HWP out
5:04 Right arm settles
Take data at 1.1594 GeV/c deadtime is 27 %
6:54 Bleedthrough 0.38 %
Comments :
Had to resteer position after 1st HWP change.

Q2 power supply switched off when changing momentum
Compton ion chamber has higher rates
Dilution runs still to be done

Runs 1.2467 GeV/c
Left arm :
3600 6.0M
3601 6.05M
3603 1.83M
3604-3606 Junk 3607 1.9M
3609 10.1 M
3610 10.8 M
3611 8.3 M
3612 1.28 M

Right arm
22629 4.46 M
22630 4.77 M
22632 1.54 M
22634 2.1 M
22636 8.75 M
22637 9.3 M
22638 7.1 M
22639 1.07 M
Total : 138 M events

Runs 1.1594 GeV/c
Left arm :
3615 2.2 M
3616 9.8 M
3617 9.9 M
3618 8.1 M
3619 8.7 M
3620 8.3 M
3621 still running
Right arm :
22641 8.4M
22642 8.6 M
22643 7.0 M
22644 7.5 M
22645 7.1 M
22646 still running