1. 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

2. 17 meters

3. 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

4. ~ 15 ns ~ 15 mV LED CALIBRATION DATA , Typ. Signal ~ 70 pe
SINGLE PHOTOELECTRON
SIGNAL AFTER ~100 M CABLE
, Typ. Signal ~ 70 pe

5. 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

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

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

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

9. 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)

10. 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

11. 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

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

13. 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

14. 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

15. Conclusions
– : 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

16. Backup

17. 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

18. 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

19. Gas System
Leaks: side A: 54.7mBar * 24hrs/16hrs = 82.1 mbar/day 0.4 bar overpressure) side C: 89.7 mBar * 24hrs/17hrs = 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 : 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)

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

21. 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.

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

23. LUCID calibration F
Final (~2010)

24. Shutdown Period –II
done

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