1. RUN COORDINATOR’S REPORT 20-27 March 2006 Thomas Schörner-Sadenius Universität Hamburg ZEUS Monday Meeting DESY, 27. März 2006

2. DESY, 27.3.2006TSS: Run Coordinator Report2 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%

3. DESY, 27.3.2006TSS: Run Coordinator Report3 HERA PERFORMANCE ¶ Instantaneous (specific) lumi up to 4.6*10 31 (2*10 30 ) ¶ Currents up to ~85 and 40 mA, respectively. ¶ Polarization going up to typically 37%.

4. DESY, 27.3.2006TSS: Run Coordinator Report4 HERA PROBLEMS Monday: CTD trips (p BG); early dump Tuesday: Protons lost (magnet error) New collimator settings  big improvement Wedneday: excellent BG situation – but many CTD trips (?) Thursday: bad p BG P lost Dust particle Electrons lost reason unclear; then bad p BG High e- BG Electrons lost (tune control, temp alarm)

5. DESY, 27.3.2006TSS: Run Coordinator Report5 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!

6. DESY, 27.3.2006TSS: Run Coordinator Report6 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!

7. DESY, 27.3.2006TSS: Run Coordinator Report7 ZEUS PERFORMANCE

8. DESY, 27.3.2006TSS: Run Coordinator Report8 ZEUS PERFORMANCE Monday - wednesday ¶ Proton background giving problems until new collimator settings were tried late Tuesday.

9. DESY, 27.3.2006TSS: Run Coordinator Report9 ZEUS PERFORMANCE Wednesday, thursday ¶ Improved background situation!

10. DESY, 27.3.2006TSS: Run Coordinator Report10 ZEUS PERFORMANCE Friday, saturday

11. DESY, 27.3.2006TSS: Run Coordinator Report11 ZEUS PERFORMANCE Sunday, Monday ¶More problems from the electron side (spikes, high base level).

12. DESY, 27.3.2006TSS: Run Coordinator Report12 ZEUS LUMINOSITY

13. DESY, 27.3.2006TSS: Run Coordinator Report13 LUMI/EFFICIENCY PER DAY

14. DESY, 27.3.2006TSS: Run Coordinator Report14 LUMI/EFFICIENCY PER FILL

15. DESY, 27.3.2006TSS: Run Coordinator Report15 LUMI LOST BECAUSE … Electron background, DAQ problems trips, DAQ problems

16. DESY, 27.3.2006TSS: Run Coordinator Report16 LUMI LOST BECAUSE …

17. DESY, 27.3.2006TSS: Run Coordinator Report17 EVENTS OF THE WEEK NC at Q 2 ~ 30000 GeV 2

18. DESY, 27.3.2006TSS: Run Coordinator Report18 EVENTS OF THE WEEK CC at Q 2 = 23200 GeV 2

19. DESY, 27.3.2006TSS: Run Coordinator Report19 EVENTS OF THE WEEK e* candidate

20. DESY, 27.3.2006TSS: Run Coordinator Report20 EVENTS OF THE WEEK Isolated photon, E = 178 GeV

21. DESY, 27.3.2006TSS: Run Coordinator Report21 EVENTS OF THE WEEK CC multijet, Q 2 = 8000 GeV 2

22. DESY, 27.3.2006TSS: Run Coordinator Report22 EVENTS OF THE WEEK Dimuon event

23. DESY, 27.3.2006TSS: Run Coordinator Report23 EVENTS OF THE WEEK W  e

24. DESY, 27.3.2006TSS: Run Coordinator Report24 NEXT WEEK … … your friendly run coordinator on duty is … John (for Monica)