Log entry time 16:01:54 on May11,2007

Entry number 201724

keyword=Shift Summary

Started shift with production data taking in progress for kinematics 11, Q^2 = 61 fm^-2, E = 1.057 GeV. Run #3345.

Around 9:25, the He cryo flow to the spectrometers dropped rapidly, causing almost all magnets to trip. The cryo group found that a compressor had shut off unexpectedly and restored flow. Resetting the magnets required a brief access. Magnets were back up around 11:35. The quads were cycled.

Riad Suleiman performed beam position monitoring tests during some of the downtime. This did not cause us to lose data taking time because the HRS-R dipole was still ramping.

Resumed production data taking with run 3348. Mostly smooth running thereafter, except for a 45-minute interruption of beam delivery due to accelerator problems. Beam current 105 uA for all runs.

Run summary:



Run#     Start time    #events    Notes

3345     07:54         0.988M     Stopped early - no beam

3346     08:36         1.25M

3347     09:16         0.318M     HRS magnets trip - cryo problems

3348     11:37         1.25M

3349     12:24         1.25M

3350     13:03         1.25M

3351     13:40         1.25M

3352     15:01         1.25M

3353     15:42         0.23M      Ended early - no beam

3354     15:53         in progress at end of shift

User name Ole Hansen

Log entry time 16:01:54 on May11,2007

Entry number 201724