Detector status and commissioning LUCID Detector description Results

Detector status and commissioning: LUCID ü Detector description ü Results from the first beams ü Overview of the status ü Plans for the shutdown ü Conclusions M. Bruschi on behalf of the LUCID collaboration 1

17 m ete r s 2

LUCID design 20 Cerenkov Tubes each end PMT RO (16) Mass = 22 Kg Volume = 54 litres Fibre RO (4) 5. 61<h<5. 93 Outer layer ~115 mm rad. Inner layer ~96 mm rad. ü LUCID approved for installation in ATLAS in January 2007 ü LUCID construction completed in July 2007 3

LED CALIBRATION DATA ~ 15 ns ~ 15 m. V SINGLE PHOTOELECTRON SIGNAL AFTER ~100 M CABLE , Typ. Signal ~ 70 pe

BEAM 2 on Sep 10 th evening Hits/s Side A Beam Monitor Side C Hits/LB Luminosity Monitor Side C Side A 5

LUCID QDC/TDC RESPONSE WITH BEAM 2 – side C QDC TDC • Good initial equalization • 1 Broken channel 6

Trigger rates (before ps) in the CTP MBTS TGC Timing in with beam -- Thilo Pauly -- ATLAS week 6 October 2008 LUCID BPTX 7

LUCID/LUMINOSITY DCS PANEL • HV, LH, P, T • Ok for beam pipe bakeout • DCS 2 Cool (Condition DB) for the hits/LB 8

Overview of the LUCID status Calibration LED system upgraded; 3 (side A) and 4 (side C) fibers for calibration broken FED (PMT) Moved to HO (incl. calib); two dead channels FED (FIBERS) fibres fed (based on MAROC 2) to be installed Readout Lumi. , trigger & rod card (LUMAT) to be installed ; Fibers readout rod card to be installed GAS System Leaks to be possibly improved; ELMB firmware to be updated Others Possibly improve fed cables thermal insulation (beam pipe bake out) TDAQ OK (for the initial scheme) DCS OK DQ On-line: mostly done; Off-line: To be done Luminosity Calib. with machine param. : to be further developed (Algorithms, protocol with LHC); On-line and Off-line Algorithms: to be improved Trigger Time alignment missing (need interactions) 9

Next Upgrades – MAROC 2 based for fibres STATUS • MAROC 2 based interface produced before the end of this year • Ready for installation on next February • 4 tubes in each detector are read-out by quartz fibers • The electronics for these channels will be ready for the 2009 run LUMAT CARD • The data recorded with this system should be able to tell us if the fiber readout is a viable option for possible future developments 10

Next Upgrades – LUMAT card STATUS • HW READY • Firmware partially developed will be finished end of this year • Ready for installation within February ü Luminosity by BC ü Flexibility on luminosity/trigger algorithms ü Lucid hits in the ATLAS data stream 11

Gas System Values during the 21 days : • Minimum : 1065. 15 mbar • Maximum : 1071. 13 mbar First filling With C 4 F 10 Gas leak tests Pulse height proportional to Abs. Gas pressure 0. 5% 12

Plans for the shutdown period ü Before ATLAS opening • Move front end and led card to HO for easier access to the electronics • Try to recover the not working channel ü Before ATLAS closing • Improve thermal insulation for cables from lucid • Try to reduce leaks • Try to understand where the fibers for led are broken and possibly • repairing them Installation of fed fibers readout (based on MAROC 2) ü Further improvements • Lumi. , trigger & rod card (LUMAT) ; fibers readout rod card • Improve remote control of gas system 13

2009 TEST BEAM CAMPAIGN ü Two weeks of test beam at DESY beginning of this year for detailed study of the performance of the installed detector ü Two periods of two weeks each on June and September at SPS H 6 for testing new ideas on LUCID phase II 14

Conclusions ü 01 -02 -2007 – 10 -09 -2008 : END OF THE CONSTRUCTION PHASE FOR LUCID ü and first data successfully taken Now we have a RUNNING DETECTOR in ADVANCED STATUS of COMMISSIONING ü The DATA TAKING PHASE will not be easier and we have to organize it carefully: Ø Data monitor and analysis Ø Calibrations (Detector, Luminosity) ü Maintenance and important improvements (LUMAT, MAROC 2 based fed) during the shutdown 15

Backup 16

Recent Developments ü LUCID rates/LB transferred from DCS into offline Database (single tubes, ü ü A&C, A|C) Procedures for Van der Meer scan under development ü communication with LHC via DIP ü define timing issues ü negotiate with LHC procedure for scan and absolute calibration with beam parameters MC simulation: ü finalize integration of LUCID MC ü study detail of forward region simulation

Actual Calibrations TUBE PED CAL PEAK < NPE > New 0 139 12. 6 quartz tot 592. 9 999. 7 36 68. 3 1 169 12. 8 607. 2 991. 6 34. 2 64. 2 2 164 11. 8 578. 3 999. 3 35. 1 70. 8 3 163 18. 3 681. 9 1127 28. 4 52. 7 4 138 12. 1 613. 2 1057 39. 1 75. 7 5 146 12 590 1021 36. 9 72. 8 6 151 10. 4 530 903. 9 36. 5 72. 5 7 142 20. 8 740 1171 28. 7 49. 4 8 176 24 863. 5 1343 28. 6 48. 6 9 159 19. 3 760. 2 1072 31. 1 47. 2 10 162 13. 8 632. 7 1057 34. 1 64. 8 11 148 22. 9 1064 1860 40 74. 8 12 177 25. 3 1080 1799 35. 7 64 13 161 29. 8 1193 1926 34. 7 59. 3 14 173 21 823. 7 1264 31 51. 9 15 109 18. 2 716. 6 1124 33. 3 55. 7 0 bar 1. 3 bar gas Calib 32. 3 10. 6 30 10. 8 35. 7 10. 2 24. 3 16. 6 36. 5 10. 7 35. 9 9. 9 36 9. 8 20. 7 17. 5 20 18. 4 16. 1 15. 2 30. 7 12. 0 34. 8 18. 4 20. 8 24. 6 23. 4 20. 9 17. 5 22. 4 16. 5 TUBE PED CAL PEAK 0 bar 1. 3 bar < NPE > New quartz tot 30. 7 68. 7 gas 38 20 164 12. 2 537 999 21 166 13. 8 636 1112 34 68. 3 22 169 10. 4 596 1006 41. 1 80. 6 23 139 12. 3 562 1032 34. 4 72. 6 24 167 12. 1 591 1081 35. 1 75. 7 25 152 13. 3 718 1121 42. 7 73. 1 26 147 9. 64 494 917. 2 36 79. 9 43. 9 27 141 12. 7 744 1378 47. 5 97. 5 50 28 178 18. 4 / 29 152 12. 7 / 30 162 12. 1 598 31 160 23. 5 32 178 33 Calib 10. 9 34. 4 10. 8 39. 4 9. 9 38. 2 12. 0 40. 6 10. 6 30. 4 11. 7 9. 4 11. 2 1250 <36. 3> 58. 2 <21. 9> 15. 9 1035 <36. 3> 69. 3 <33. 0> 4. 8 1104 35. 9 77. 6 844 1430 29. 1 54 12. 2 580 1137 33 78. 7 / / / / 34 174 10. 3 / 35 162 8. 51 / 41. 7 11. 5 24. 9 15. 6 45. 7 10. 5 / / 1048 <36. 3> 85. 1 <48. 8> 10. 6 896. 6 <36. 3> 86. 4 <50. 1> 7. 5 18

Gas System Leaks: side A: 54. 7 m. Bar * 24 hrs/16 hrs = 82. 1 mbar/day (@ 0. 4 bar overpressure) side C: 89. 7 m. Bar * 24 hrs/17 hrs = 126. 6 mbar/day (@ 0. 4 bar overpressure) The measurements performed by Jan and Richard were at 0. 3 bar overpressure side A: 82. 1 m. Bar/day *3/4 = 62 mbar/day (was: 40 mbar/day) (@ 0. 3 bar overpressure) side C : 126. 6 m. Bar/day *3/4 = 95 mbar/day (was: 50 mbar/day) (@ 0. 3 bar overpressure) Actual overpressure: 0. 1 bar Side A: 82. 1*1/4 = 21 mbar/day (10 g/day or: 2 CHF/day) Side C: 126. 6*1/4 = 32 mbar/day (16 g/day or: 3 CHF/day) 19

CORRELATIONS BCM/LUCID/MBTS/LV 1 C BEAM 2, Sep 10 th Sep 11 th 20

LUCID detector principle Cherenkov light is emitted at 3 o and is read-out after < 3 > reflections on the inner tube walls. ü Background suppression: ü Cherenkov threshold in the gas (10 Me. V for e- and 2. 8 Ge. V for ) ü Tubes are pointing to the pp interaction region. ü The fast response (few ns) allows for single bunch crossing detection. 21

LUCID basic concept On and Off-line 22

LUCID calibration FFinal (~2010) 23

Shutdown Period –II üdone 24

FIRST HITS SEEN ON Sept. 10 th ! LV 1 C MBTS LUCID With BEAM 2 LUCID With BEAM 1 25

26