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

17 meters

LUCID design 5.61<h<5.93 20 Cerenkov Tubes each end Fibre RO (4) PMT RO (16) Outer layer ~115 mm rad. Inner layer ~96 mm rad. 20 Cerenkov Tubes each end Mass = 22 Kg Volume = 54 litres 5.61<h<5.93 LUCID approved for installation in ATLAS in January 2007 LUCID construction completed in July 2007

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

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

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

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

LUCID/LUMINOSITY DCS PANEL HV, LH, P, T Ok for beam pipe bakeout DCS2Cool (Condition DB) for the hits/LB

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 MAROC2) 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)

Next Upgrades – MAROC2 based fed for fibres STATUS MAROC2 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 The data recorded with this system should be able to tell us if the fiber readout is a viable option for possible future developments LUMAT CARD

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

Pulse height proportional to Abs. Gas pressure  0.5% Gas System Values during the 21 days : Minimum :1065.15 mbar Maximum :1071.13 mbar First filling With C4F10 Gas leak tests Pulse height proportional to Abs. Gas pressure  0.5%

Plans for the shutdown period Before ATLAS opening Move front end and led card to HO for easier access to the electronics Try to recover the not working channel 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 MAROC2) Further improvements Lumi., trigger & rod card (LUMAT) ; fibers readout rod card Improve remote control of gas system

2009 TEST BEAM CAMPAIGN Two weeks of test beam at DESY beginning of this year for detailed study of the performance of the installed detector Two periods of two weeks each on June and September at SPS H6 for testing new ideas on LUCID phase II

Conclusions 01-02-2007 – 10-09-2008 : END OF THE CONSTRUCTION PHASE FOR LUCID and first data successfully taken Now we have a RUNNING DETECTOR in ADVANCED STATUS of COMMISSIONING The DATA TAKING PHASE will not be easier and we have to organize it carefully: Data monitor and analysis Calibrations (Detector, Luminosity) Maintenance and important improvements (LUMAT, MAROC2 based fed) during the shutdown

Backup

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

Actual Calibrations TUBE PED CAL < NPE > New quartz tot gas PEAK < NPE > New 0 bar 1.3 bar quartz tot gas Calib 139 12.6 592.9 999.7 36 68.3 32.3 10.6 20 164 12.2 537 999 30.7 68.7 38 10.9 1 169 12.8 607.2 991.6 34.2 64.2 30 10.8 21 166 13.8 636 1112 34 34.4 2 11.8 578.3 999.3 35.1 70.8 35.7 10.2 22 10.4 596 1006 41.1 80.6 39.4 9.9 3 163 18.3 681.9 1127 28.4 52.7 24.3 16.6 23 12.3 562 1032 72.6 38.2 12.0 4 138 12.1 613.2 1057 39.1 75.7 36.5 10.7 24 167 591 1081 40.6 5 146 12 590 1021 36.9 72.8 35.9 25 152 13.3 718 1121 42.7 73.1 30.4 11.7 6 151 530 903.9 72.5 9.8 26 147 9.64 494 917.2 79.9 43.9 9.4 7 142 20.8 740 1171 28.7 49.4 20.7 17.5 27 141 12.7 744 1378 47.5 97.5 50 11.2 8 176 863.5 1343 28.6 48.6 18.4 28 178 / 1250 <36.3> 58.2 <21.9> 15.9 9 159 19.3 760.2 1072 31.1 47.2 16.1 15.2 29 1035 69.3 <33.0> 4.8 10 162 632.7 34.1 64.8 598 1104 77.6 41.7 11.5 11 148 22.9 1064 1860 40 74.8 34.8 31 160 23.5 844 1430 29.1 54 24.9 15.6 177 25.3 1080 1799 64 32 580 1137 33 78.7 45.7 10.5 13 161 29.8 1193 1926 34.7 59.3 24.6 23.4   14 173 823.7 1264 51.9 20.9 174 10.3 1048 85.1 <48.8> 15 109 18.2 716.6 1124 33.3 55.7 22.4 16.5 35 8.51 896.6 86.4 <50.1> 7.5

Gas System Leaks: side A: 54.7mBar * 24hrs/16hrs = 82.1 mbar/day (@ 0.4 bar overpressure) side C: 89.7 mBar * 24hrs/17hrs = 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 mBar/day *3/4 = 62 mbar/day (was: 40 mbar/day) (@ 0.3 bar overpressure) side C : 126.6 mBar/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)

CORRELATIONS BCM/LUCID/MBTS/LV1C BEAM 2, Sep 10th Sep 11th

LUCID detector principle Cherenkov light is emitted at 3o and is read-out after < 3 > reflections on the inner tube walls. Background suppression: Cherenkov threshold in the gas (10 MeV for e- and 2.8 GeV for ) Tubes are pointing to the pp interaction region. The fast response (few ns) allows for single bunch crossing detection.

LUCID basic concept On and Off-line On and Off-line Off-line

LUCID calibration F Final (~2010)

Shutdown Period –II done

FIRST HITS SEEN ON Sept. 10th ! LV1C MBTS LUCID With BEAM 2 LUCID With BEAM 1