TPC status and plans

1
TPC status and plans LHCC CR7, CERN, 19th March
2007 L. Musa

• Outline
• Pre-commissioning above ground (2006) short
  summary
• Preparing for the commissioning in the cavern
  (2007)

2
TPC pre-commissioning above ground (2006)

• A first phase of TPC Commissioning was carried
  out above ground in the course of 2006
• Jan-Mar installation of SSW and FEE
• April start of gas system
• May HV (100KV) applied to FC
• JunDec test of all sectors (in pairs)

• Each sector was operated continuously over a
  period of 40 hours and verified with
• calibration pulser,
• cosmic-muon trigger detector ACORDE
• UV laser system for the generation of tracks in
  the detector

Many TPC and ALICE sub-systems (e.g. cooling,
gating grid pulser, temperature sensors, DCS,
Trigger, DAQ, HLT and Offline) have been part of
this commissioning programme
300 man shift, 3588 runs, 24 TB in CASTOR
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TPC pre-commissioning above ground (2006)
ALICE COSMIC Trigger (ACORDE)
Laser tests
Cosmic tests

• Only two sectors could be instrumented at a time
  with
• Low Voltage Power Supplies
• Cooling
• Commissioning objectives
• Test functionality of all components
• gas stability, noise, signal tails, gain
  homogeneity, space resolution, etc.

Each pair of sectors continuously operated over
40 hours
4
TPC pre-commissioning (2006) some results Gas
system
Excellent stability ? excellent gas tightness
1-2 ppm oxygen _at_ 1/3 of nominal gas flow (TDR
requirement lt 5ppm O2)
5
TPC pre-commissioning (2006) some results
Noise measurements
after optimization of ground scheme and with VHV
off
? (PASAnoise2 ADCnoise2) 0.70 ADC counts
r.m.s. of the pedestals (sNOISE) is below 1 ADC
count as required in the Technical Design Report
6
First cosmic rays events
Outer ROC
Inner ROC
3-dimensional view of a cosmic muon track
traversing 2 sectors
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First cosmic rays events
Outer ROC
Inner ROC
Front view
Side view
3-dimensional view of a shower induced by cosmic
rays
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TPC pre-commissioning (2006) some results
Cosmic tracks
A
B
O2 extracted from fit to our data
space point resolution as function of z position
(cut on inclination angle tan(f) lt0.05)
A
TDR value 210mm / ?cm

• Q total (total charge in the cluster) as
  function of z position
• relative decrease over the full TPC length 10
• decrease due to electron capture and tail losses
  
• (diffusion)

B
1-2 ppm of O2 measured with oxygen analyser
9
TPC pre-commissioning (2006) some results
Laser tracks
Design
Measured
Drift velocity 2.73 cm/ms ? agreement with
drift monitor detector (Goofie)
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Moving the TPC into the ALICE magnet
? Jan 07 TPC has been lowered in UX25

• After the alignment with respect to the beam
  line, the TPC has
• been put in parking position.
• February, alignment of SSW with respect to
  endplate, and test of the
• connection of FEE to the endplate
  (calibration pulser)

? All 4356 FECs and 216 RCUs are working ? All
26136 kapton cables are properly connected to the
pad plane
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Alignment of SSW wrt endplate within mm
Displacements of SSW wrt endplate should not
exceed 3mm
7 mm
Readout Chamber
X
Front End Card
kapton cable
Y
Z
12
Preparing for Commissioning in UX25

• In 2006 all efforts mostly devoted to
  pre-commissioning in SXL2

• Few hardware components still to be finalized or
  constructed
• Trigger Busy Box (being finalized and tested)
• TriggerDCS Interface Unit for Laser, GG Pulser
  and Calibration Pulser
• (starting design)

• Many software components to be finalized and
  commissioned
• Some examples
• Software for the configuration and monitoring of
  the FEE
• Interface to the FERO database
• Interface to ECS
• DCS for some of the sub-systems and TPC FSM
  (Supervisory Layer)
• Data Quality Monitoring

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Preparing for Commissioning in UX25
Connecting the TPC to the ALICE systems and
services

• Cables, fibers and cooling pipes (all cables and
  cooling lines will be tested
• before connecting them to the TPC )

• Installation from crates to patch panels _at_
  backframe (C side)

completion end of April

• test assembly of connectors _at_ patch panels on
  backframe (C side)

starting from May

• TPC wil be moved to final position (interaction
  point) middle June

• Connection of TPC C side second half of June

• installation of miniframe (A side) middle of
  August

• test assembly of connectors _at_ miniframe (A
  side)

second half of August

• Connection of TPC A side 26 Aug 7 Sep

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Preparing for Commissioning in UX25
Connecting the TPC to the ALICE systems and
services cont.

• The TPC can be connected to the Gas system
• only in final position

middle June

• About 1 month to reach nominal gas composition

middle July
Note

• The TPC can be connected to the Gas
• System with final pipes (on A side)
• only after installation of miniframe
• (middle August) and closure of magnet
• doors (middle October)

• From middle June to middle October,
• the TPC will be connected to the
• Gas System via auxliary pipes

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Preparing for Commissioning in UX25
Installation tasks for the TPC Collaboration
(starting from May)

• cut, put connectors, mount cables going to TPC
• (10 Redel, 5SHV, 38 LVsense, 19 ctrl, 19 mon,
• 12 laser, 4 ELMB per side)
• cut, put on lugs, LV cables
• (72 per side)
• mount stored cables coming from TPC
• (44 per side)
• proper bundling towards TPC and towards
• backframe/miniframe
• (252 cables, 112 fibers per side)
• support structure between SSW and
• backframe

HV, LV sense, temp ELMB, laser
LV
miniframe/ backframe
TPC
SSW
cooling
Gate, Calib, DCS DDL, TTC
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TPC commissioning - Milestones

• Test of FEE ROC (C-side)

• Turn on FEE July

• Test of FEE, Trigger, DAQ, DCS and services July

• Test of ROCs July - Aug

• Test of FEE ROC (A-side)

• Turn on FEE Sep

• Test of FEE, Trigger, DAQ, DCS and services Sep

• TPC Commissioning with cosmic tracks, laser Sep
  - Oct
• and Kr

• ALICE Commissioning Oct -Nov

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TPC work plan ( resources) in 2007
Cables, fibers, and pipes
TC ALICE Technical Coordination Team
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TPC work plan resources
Cables, fibers, and pipes contd
TC Technical Coordination Team
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TPC work plan resources
Power supplies and pulsers
TC Technical Coordination Team
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TPC work plan resources
Electronics debugging spares new developments
TC Technical Coordination Team
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TPC work plan resources
Electronics debugging spares new developments
contd
TC Technical Coordination Team
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TPC work plan resources
Configuration, Control and Monitoring Software
TC Technical Coordination Team
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TPC work plan resources
Configuration, Control and Monitoring Software
contd
TC Technical Coordination Team
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TPC work plan resources
Other commissioning activities
TC Technical Coordination Team
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TPC work plan resources
TPC Commissioning
TC Technical Coordination Team
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Preparing the TPC Calibration
Calibration software for 2007)

• Electronics (pedestals, noise, gain, time
  offset, peaking time)

• pedestal runs, calibration pulser

• R. Bramm, H. Helstrup, J. Thaeder

• Gain (parametrization, pad-by-pad variations,
  dE-dx, attenuation loss)

• Krypton, cosmics (parametrization), laser
  (central electrode signal)

• J. Wiechula, P. Christiansen, P. Gros, H.
  Helstrup, J.Thaeder, D. Vranic, M. Kowalski,
• S. Gaertner

• drift velocity

• laser tracks and central electrode signal

• M. Ivanov, J. Wiechula, L. Bozyk, R. Bramm,
  J.Thaeder, R. Toft

• Space point (resolution and cluster shaper
  parametrizations)

• M. Ivanov (TDR values already achieved)

• Space point corrections (E distorsions, E ? B,
  drift velocity)

• laser tracks and central electrode signal

• M. Ivanov, J. Wiechula, M. Mager, M. Kowalski

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Preparing the TPC Calibration
Calibration software, contd

• Alignment (central electrode, internal
  alignment, global alignment)

• M. Kowalski, D. Vranic, M. Ivanov, J. Wiechula

• Data quality monitoring based on calibration
  parameters
• (noise, gain, time offset, space point
  resolution)

• pulls for sectors, pad-rows, detection of
  outliers, alarms

• TPC, HLT, DAQ, Offline (under discussion)

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Conclusions

• Exstensive commissioning of the TPC above ground
  (2006)
• TPC in good shape
• many parameters already verified and according
  to TDR specs

• Successful transport to UX2, insertion and
  alignment into SF (Jan 07)

• FEE re-tested after transport (Feb 07)

• Still some hardware and software components to
  be finalized

• TPC will be connected on the A side by June, and
  on the C side by August

• Commissioning with calibration pulser, cosmics,
  UV laser tracks, and Krypton
• Jul-Aug A-side only
• Sep-Oct whole TPC

• The TPC Collaboration is well organized to
  complete the installation and the
• commissioning according to schedule and be
  ready for the LHC operation in Nov 07

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Spare Slides
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Commissioning of the Gas System

• Features
• ? 8 racks (CERN Gas working group)
• ? PLC-controlled and PVSS-Unicos
• user interface for control and
• alarms (CERN IT-CO)
• ? Precise detector pressure
• regulation
• ? Filling procedure for saving neon
• (á la CERES)
• Purge with CO2
• Inject Ne while removing CO2
• with molecular sieve Gas
• Top-up with N2
• ? Small fresh gas injection of
• ternary mixture

Control Backup Mixer Purifier CO2 Distr
Analys Pump
TPC Gas System at SLXL2
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Commissioning of the gas system
Control of Gas composition
Gas analysis with a Thermal conductivity device
Gas Chromatograph with a 'tandem' column
(premixed gas for reference)
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Pedestal Measurments noise
before optimization of ground scheme
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Pedestal Measurments noise
before optimization of ground scheme
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Pedestal Measurments - baseline
busy FEC replaced on December 7th
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Pedestal Measurments baseline
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Pedestal Measurments baseline stability
37
Pedestal Measurments baseline stability (contd)
38
Gain Summary A side
?
?
?
39
Gain Summary C side
?
?
?
?
?
?
?
40
OROC exchange

• Broken anode wire in OROC 00
• Clearly caused by melting
• It is still unclear, how this can happen
• Studies with a test sector are ongoing
• Mounting tool modified
• longer lever due to presence of SSW
• Complicated procedure, it required
• Removing FEE and frames of full sector
• Exchange of feet of FEE frames of neighboring
  sectors by smaller versions to allow removal of
  sealing bars
• Remove pt1000 sensors on ROC body
• Yellow platform in modified setup (cope with
  I-bars)
• Exchange itself without any problems

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ROC exchange
42
Trailer transport SXL2 to SX2
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Trailer transport SXL2 to SX2
44
Descend to the cavern
2 hours for descent
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TPC insertion into SF
40 cm to IP

• Test-drive with TPC to IP
• Align TPC, SF, ITS rail sys at IP
• Back to parking position
• Window of about 6 weeks
• Check alignment SSW vs TPC
• Re-test all FEE (all sectors)
• Installation of beam line and ITS

at IP
46
Inside heat screen on ITS platform