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RUN COORDINATOR’SREPORT 20-27 March 2006
Thomas Schörner-SadeniusUniversität Hamburg
ZEUS Monday MeetingDESY, 27. März 2006
DESY, 27.3.2006 TSS: Run Coordinator Report 2
SUMMARY
¶ Overall: – smooth data taking without major problems – still suffering from both proton- and electron-induced background problems
¶ Lumi this week: – HERA delivered: ~8.3 pb-1 – ZEUS gated: ~5.8 pb-1 – Largest fill: 1.02 pb-1 delivered – best fill: 81% efficiency
¶ Very smooth HERA operation: – Twelve fills – efficiency typically close to 80% – average efficiency 69%
DESY, 27.3.2006 TSS: Run Coordinator Report 3
HERA PERFORMANCE
¶ Instantaneous (specific) lumi up to 4.6*1031 (2*1030)
¶ Currents up to ~85 and 40 mA, respectively.
¶ Polarization going up to typically 37%.
DESY, 27.3.2006 TSS: Run Coordinator Report 4
HERA PROBLEMS
Monday: CTDtrips (p BG); early dump
Tuesday: Protons lost (magnet error)
New collimatorsettings bigimprovement
Wedneday: excellentBG situation – but many CTD trips (?)
Thursday: bad p BG
P lost Dust particle
Electrons lostreason unclear;then bad p BG
High e- BG
Electrons lost(tune control, temp alarm)
DESY, 27.3.2006 TSS: Run Coordinator Report 5
ZEUS PROBLEMS¶ Numerous small hick-ups … (many components with small DAQ problems, keeping busy, not handshaking, introducing dead time etc.).
¶ … but big disasters
¶ One word on shift crew motivation (true for both HERA and ZEUS):
– Please read the instructions before you come on shift (shift instructions, message from run coordinator, tasks of the moment, known problems)!
– Please talk to the previous shift crew and read the log book!
– … and make sure that there is always somebody in the control room!
– If in doubt call expert soon!
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ONLINE DDL …¶ Uta reported on reconstruction error related to CAL tables since long.
¶ On Thursday Ulf and Sergei created new online data flow DDL to overcome problem. – First taking data … – then, late Friday night, suspecting problems and going back to old version. – Saturday morning going for new version (22) again.
¶ Reconstruction error does not occur anymore. Tables seem to be okay.
¶ But we cannot be 100% sure. Physics groups, please check the data, especially
the runs 58754, 58759 and 58763 which were reconstructed with the new code in the XP line. Please report if you find problems!
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ZEUS PERFORMANCE
DESY, 27.3.2006 TSS: Run Coordinator Report 8
ZEUS PERFORMANCEMonday - wednesday
¶ Proton background giving problems until new collimator settings were tried late Tuesday.
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ZEUS PERFORMANCEWednesday, thursday
¶ Improved background situation!
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ZEUS PERFORMANCEFriday, saturday
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ZEUS PERFORMANCESunday, Monday
¶More problems from the electron side (spikes, high base level).
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ZEUS LUMINOSITY
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LUMI/EFFICIENCY PER DAY
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LUMI/EFFICIENCY PER FILL
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LUMI LOST BECAUSE …
Electron background,DAQ problems
trips,DAQ problems
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LUMI LOST BECAUSE …
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EVENTS OF THE WEEKNC at Q2 ~ 30000 GeV2
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EVENTS OF THE WEEKCC at Q2 = 23200 GeV2
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EVENTS OF THE WEEKe* candidate
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EVENTS OF THE WEEKIsolated photon , E = 178 GeV
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EVENTS OF THE WEEKCC multijet, Q2 = 8000 GeV2
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EVENTS OF THE WEEKDimuon event
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EVENTS OF THE WEEKWe
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NEXT WEEK …… your friendly run coordinator on duty is …
John(for Monica)
