1. TPC Status Outline Completion of installation 14 September 2006
Commissioning
Gas system
Laser
Data Acquisition
Readout Chambers
Front End Electronics
Conclusions

2. TPC nearly completed

3. Completion of installation
Completion and test of cabling and many services
LV connections to FEC’s (432 bundles, 4356 connections)
Water cooling ROC bodies
Water cooling FEC’s (about pieces)
Ground bars, ground connections
Distribution panels and boxes (15 cables/sector)
Pt1000 (replacement of some damaged ones)
Cabling of Laser’s cameras and motors
...
To be done (completion by first week of October)
Install FECs in sector C12
Install RCUs in last 6 sectors (C07  C12)
cabling of RCU´s (2 fibbres + 1 LAN per RCU)
RCU support bars
Install water manifold
Closing sectors with copper covers (last operation before lowering TPC in UX)

4. Commissioning of the Gas System
Run
Stable operation
< 5ppm O2
overpress.: ± 0.013
Some perturbations due to
power cuts
In progress
tuning of back-up system
determination of exact gas
composition
Goofie (drift velocity and
gain measurements)
Gas Chromatograph
(new double column)
Control Backup Mixer Purifier CO2 Distr Analys Pump
TPC Gas System at SLXL2

5. One laser installed on the floor
Laser System
Design Side A
Measured Side A
One laser installed on the floor

6. Laser System Laser on floor
Laser beam at end of TPC rod.
Shadow of 4 micro-mirror bundles
Laser on floor
Motor adjustable mirror and camera assembly
First recorded laser tracks

7. DAQ Setup for TPC commissioning
— Sector1 —
— Sector2 —
lnxpool13
aldaqcon03
TTC
RCU
RCU
LTU
TTCvi, TTCex 6x 6x PC
TPC monitoring
SIU
SIU
GbE Switch
SXL2
PX24/CR1
PX24/CR2
HLT Farm
513
6x DRORC
6x DRORC
502
514
LDC
LDC
1x DRORC
1x DRORC
CASTOR
DDG
LDC
GPN
aldaqpc010
aldaqpc011
aldaqpc013
aldaqpc012
Force10
GbE Switch (3COM)
100 MB/s (to be upgraded)
GDC mStream TDSM
GDC
mStream TDSM
Server:
DAQ, ECS, MySQL, MOOD
Server: SLC3,DHCP,
DNS,…
Gateway
SLC Castor DATE 5.23 MySQL ECS 2.10
aldaqpc002
aldaqpc001
aldaqds002
/mdlocal
aldaqds001
pcald25
/local (134GB)
/tds1
/tds1
TDS
aldaqtds03
2x 1.4 TB RAID5+spare, XFS

8. DAQ, ECS and HLT for TPC commissioning
Data Acquisition System
Running since May’06, so far ~2100 runs and estimated 2 TB of data
No hardware failures
Identification of sector+partition with final EquipmentID numbers
Recording in ROOT format and automatic migration to CASTOR
Monitoring online, from disk, from CASTOR (MOOD OM, Expert OM, offline OM)
Trigger sequences defined for cosmic, laser, pedestal, and calibration pulser
Experiment Control System
Ready to provide overall control for DAQ, LTU, and HLT
High Level Trigger
integration and commissioning in progress
3D online event display is working

9. Characterization of Readout Chambers
Systematic Test (all sectors)
Test with calibration pulser
homogeneity of electronic gain
electrical connectivity
calibration pulse can display many ROC anomalies
Test with cosmic tracks for 3 anode voltages:
nominal voltage 20(30) ADC counts for IROC(OROC))
nominal voltage ±~50V
verification of basic functionality of chamber and electronics
Test with laser tracks for 3 anode voltages:
verification of basic functionality of chamber and drift volume (well
defined tracks)
Special Tests
long term test of 4 sectors: continuous operation for ~ 40 hours

10. Characterization of Readout Chambers, cont.
Status and results
30 sectors (out of 36) have been completely characterized
in average 2 sectors every 3 days (~ 1 week ahead of schedule)
All chambers perform, in terms of resolution, fully to specs
Few chambers show some anomalies at high gain  under investigation

11. Test of readout chambers – Summary of A side
under further investigation
A04 OROC
anomalous anode wires
A11 IROC
anomalous edge/anode wire
A13 OROC
floating gating grid wire
ROC according to specifications
ROC with some anomalous wire (behaviour)

12. Test of readout chambers – Summary of C side
under further investigation
C16 IROC
anomalous anode wires
C02 IROC
anomalous anode/edge wire
C04 OROC
anomalous anode wires
C05 IROC
anomalous anode wire
C06 OROC
floating gating grid wire
ROC according to specifications
ROC with some anomalous wire (behaviour)

13. Example of a ROC with anomalous anode wire – A04 OROC
Va = 1550 V
Va = 1600 V
short pads
long pads
short pads
long pads
Va = 1650 V
short pads
long pads

14. Example (worst) of a ROC with anomalous anode wire – C04 OROC
Va = 1600 V
Va = 1650 V
Signal in pad row 61 is 4 x nominal amplitude!
However, it reduces with time of operation  see next slide
Further measurements and simulations in progress

15. Example (worst) of a ROC with anomalous anode wire – C04 OROC
Va = 1600 V
Va = 1600 V
Septembre 1, 16h:00
Septembre 2, 14h:00
Va = 1600 V
Va = 1600 V
Septembre 2, 15h:00
Septembre 2, 16h:00

16. Example (worst) of a ROC with floating gg wire – A13 OROC
At pad-row 67, floating gating grid wire
Laser Run
gg closed
signal from central electrode

17. Consequences of a floating gg wire (Preliminary)
Tests with different GG polarities (laser tracks)
Reversed polarity on GG reduces signal by factor
Same results from GARFIELD simulations
Aging effects
The floating gating grid wire in OROC 13 should not lead to any
instability or ageing problems even at the highest Pb-Pb luminosities
Drift field distortions (M. Kowalski)
A detailed study of the distortions due to the leaked ion charge into the
drift volume is underway (expected to be comparable to distortions due
to space charge and B-field non homogeneity)

18. Characterization of all sectors
FEE Characterization
Characterization of all sectors
baseline, rms baseline,
electronic gain, pulse width and t0 (calibration pulser)
Special tests on few sectors
zero suppression
high trigger rates ( no trigger busy logic!)
1000 samples / 20 Hz
100 samples / 100Hz
10 samples / channel @ 1KHz
test of DCS monitoring: voltages, currents and temperatures of all FECs

19. FEE Characterization - Typical Sector (A08 – IROC)
sum of charges
sum of charges, pad row 46
baseline
noise rms (ADC counts)

20.  (PASAnoise2 + ADCnoise2) = 0.70 ADC counts
FEE Characterization - Typical Sector (A08 – IROC)
sum of samples
baseline
baseline rms
 (PASAnoise2 + ADCnoise2) = 0.70 ADC counts

21. FEE Characterization - Typical Sector (A08 – OROC)
sum of charges
sum of charges, pad row 11
baseline
noise rms (ADC counts)

22. FEE Characterization - Typical Sector (A08 – OROC)
sum of samples
sum of samples
baseline rms
baseline rms

23. FEE Characterization - Typical Sector (A08 – OROC)
under investigation

24. First results from analysis of commissioning data:
Conclusions
Gas system is working with excellent stability
back-up system needs some further commissioning
goofie integration is in progress
Laser is working, alignment completed on both sides
work to finalise system in UX is progressing on schedule
DAQ fully operational, ECS is ready, HLT commissioning in progress
Commissioning of FC, ROC, FEE well advanced
First results from analysis of commissioning data:
many features very close to TDR specifications or better
several issues need further investigation

25. Commissioning will continue with
Conclusions, cont.
Commissioning will continue with
test of remaining 6 sectors on C side (complet. by end of September)
cabling of RCUs (complet. by middle of October)
(re-)test of all sectors (ROCs + FECs) after completion of RCU cabling

26. spare slides

27. Additional work to finalise system in UX
Laser System
Additional work to finalise system in UX
Introduce up to 18 simultaneous cameras in read-out
soft + hardware almost ready in Copenhagen
Introduce motorisation of mirror alignment
some cabling and electronics missing
Add second laser (from Ekspla, not Spectron)
received and tested + software done in Copenhagen
Full integration of DCS software
includes attempt to optimise alignment automatically and
possibility to trigger lasers externally in sync with LHC clock
Infrastructure and cabling in UX
in progress with integration team

28. Diffusion and electron capture
The Q total (total charge in the cluster) as function of z position
relative decrease over the full TPC length: ~7%
decrease mainly due to electron capture and threshold effect
bigger statistics needed not to be influenced by Landau fluctuations
The RMS of the cluster shape in r- f direction as function of z position
cut on inclination angle <0.05
TDR value
1% / (m ppm)

29. Not known with enough accuracy
Gas History
N2 HISTORY
Not known with enough accuracy
O2 HISTORY

30. Readout Chamber gain studies – sector C02
Nominal gain for IROC
at ADC channel 20
Nominal gain for OROC
at ADC channel 30

31. Readout Chamber gain studies