ALICE TPC Status, Meeting with LHCC referees 30.6.03 1

ALICE TPC – Status Report

Project leader: Peter Braun-Munzinger, GSI DarmstadtDeputy project leader: Johanna Stachel, HeidelbergTechnical coordinator: Peter Glässel, Heidelberg

Bergen D. Röhrich Data acquisitionBratislava B. Sitar 1/2 IROC series productionCERN T. Meyer Field cageCERN L. Musa ElectronicsCopenhagen B.S. Nielsen Laser systemKrakow M. Kowalski SimulationsDarmstadt GSI H.R. Schmidt ROC engineering, prototyping,

series production, simulationsDarmstadt TU H. Oeschler Electronics testingFrankfurt R. Renfordt Electronics testing, installationHeidelberg KIP V. Lindenstruth Data acquisition, HLTHeidelberg PI J. Stachel Electronics, engineering,

IROC production, OROC productionLund H.A. Gustafsson Electronics

ALICE TPC Status, Meeting with LHCC referees 30.6.03 2

Outline

Field cageReadout chambersLaser systemCooling systemGas system

Readout electronics Schedule

ALICE TPC Status, Meeting with LHCC referees 30.6.03 3

TPC Field Cage Overview

Inner and outer Isolation vesselsAluminum End Plates housing ROC’sField defining system: strips supported by rods

ALICE TPC Status, Meeting with LHCC referees 30.6.03 4

Field Cage Parts, Overview

5560

5000

Drift volume

Isolation volume

Isolation volume

End

whe

el

Central membrane

OCV

OFV

IFV

Central drumcone ICV

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Field Cage: Mounting Rod Supports

ALICE TPC Status, Meeting with LHCC referees 30.6.03 6

Field Cage: Rod Assembly

ALICE TPC Status, Meeting with LHCC referees 30.6.03 7

Resistor Rod status

Completed:Gas-cooled prototype

Contacts okStill a few improvements neededRather complicated to produceNeeds separate CO2 gas system

Water-cooled prototypeFull prototype end July03

HV tests both successfulResistor tests: stability, overvoltage tolerance

Water-cooled rod preferred solution

In progress:Tooling and pieces for production (water cooled)

Concerns:Tight schedule (first 2 rods needed Dec03), manpower

ALICE TPC Status, Meeting with LHCC referees 30.6.03 8

Resistor Rod Cooling

gas cooled

water cooledHigh-resistivity water

10G10 Separator

Resistor

Cu-heat bridges

Ceramic pipe Resistor

insulation volume (gas)

gnd 100 kV

ALICE TPC Status, Meeting with LHCC referees 30.6.03 9

Field Cage Inner Drum

Delivered by FischerAl strips (ground) prepared

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The Inner FC vessel is being rebuilt

What happened:Leak test: 25 Feb03 --> leaks at glue joint

between composite and flangeUltrasonic test: 27 Feb03 --> faulty glue bondsFirst repair by Fischer: 10-14 Mar03,

only on outer joint Decision to rebuild: 24 Apr03, order 6 May03

Consequences:Repeat work:

Assembly at CERN Jul03Leak test, guard rings, vias, Resistor chain, rod supports

Total delay 7 months, Ready to install rods Dec03Complete FC equipment Jul04 Defective vessel

ALICE TPC Status, Meeting with LHCC referees 30.6.03 11

Impact of FC Schedule on Pre-Installation

7 months

3 m

onth

flo

at

Pre-commissioning of TPC shortened from 13 to 6 month

ALICE TPC Status, Meeting with LHCC referees 30.6.03 12

Field Cage: Central Electrode

ALICE TPC Status, Meeting with LHCC referees 30.6.03 13

Field Cage: Central Electrode

Completed:Modification of stretching machineStock of 6m wide glued mylar foilStretching and rupture testelectrode frames and manipulation tool

Not started yet:Production of 3 electrodes (not earlier than needed)

ALICE TPC Status, Meeting with LHCC referees 30.6.03 14

Field Cage Status Summary

Completed:Mounting rod supports on OFVInner conesCentral drum

In progress:Gluing standard rodsGluing laser rods

Not started yet:Rebuild of IFV (assembly at CERN Jul03)Testing and equipment of new IFVLoad test on outer insulation volumeRebuild of one inner cone (change of dimensions at muon absorber)

ALICE TPC Status, Meeting with LHCC referees 30.6.03 15

Service Support Wheel

Completed:

Design of frame and servicesPrototype sectors for FEE assembly trial

In progress:Construction Design of details for connection to ITS services and beam pipe

Concerns: Installation of FEC’s difficult, tight space

Carries FEE and services

ALICE TPC Status, Meeting with LHCC referees 30.6.03 16

Front End Card Installation

FEC in Cu sandwich

6 cables per FECconnectors with locks

Model setup at GSI to study FEE installation

development of tool for cable insertion, connector locking/ unlocking

IROC

ALICE TPC Status, Meeting with LHCC referees 30.6.03 17

IROC Production Bratislava

Quality good Very uniform wire spacingVery uniform wire tension

Leak and gain tests lagging behind due to (trivial) technical problems, mostly solved alreadyProduction running smoothly now at 2 ch/month

not on critical path

ALICE TPC Status, Meeting with LHCC referees 30.6.03 18

OROC Production Heidelberg/GSI

Initial problems with segmented pad planes solved, but still more difficult than anticipated

(2 padplanes out of 14 have to be redone)Leak rate lower per area than IROCEach chamber is surveyed, geometry within specs

Production running at 1 ch/week now

ALICE TPC Status, Meeting with LHCC referees 30.6.03 19

OROC Production Heidelberg/GSI

Survey of planarity andpad geometry

ALICE TPC Status, Meeting with LHCC referees 30.6.03 20

OROC Production Heidelberg/GSICoarse and fine adjustment of a wire plane

ALICE TPC Status, Meeting with LHCC referees 30.6.03 21

OROC Production Heidelberg/GSI

Measuringwire tension

ALICE TPC Status, Meeting with LHCC referees 30.6.03 22

OROC Production Heidelberg/GSI

Chamber in test setup

ALICE TPC Status, Meeting with LHCC referees 30.6.03 23

ROC Status Summary

Completed:Assembled: IROC 27, OROC 12Tested: IROC 18, OROC 5

In progress:Production rates: OROC 1 ch/week,

IROC 2 ch/moExpect to finish early 2004

Concerns:OROC: gluing of pad plane (4 sectors) more difficult than anticipatedTesting in Bratislava not yet fully operational

ALICE TPC Status, Meeting with LHCC referees 30.6.03 24

Laser System

Completed:Micro-mirrors: delivered, tested and selectedPreparation of laser rod segments and mirror holdersTooling for gluing rods

In progress: Assembly of laser rods (till Sep03)Procurement/construction of optics elements

Concerns: none

ALICE TPC Status, Meeting with LHCC referees 30.6.03 25

Electronics Cooling

27 kW to be removedSystem design nearly completed, draft document existsPRR in fall

FEE cooling

ROC padplane thermal screen

ALICE TPC Status, Meeting with LHCC referees 30.6.03 26

TPC Gas System

In progress:System for drift gas Ne/CO2 (90/10)

Construction nearly finished, commissioning till Dec03Connection to pre-installation site SXL2 (existing lines)

Not yet started:CO2 for insulation volumes: still to be done

very simple in case of water cooled resistor rod

Concerns: none

ALICE TPC Status, Meeting with LHCC referees 30.6.03 27

TPC PASA

Final submission 27 May03engineering sample 500 chips Sep03rest of production (40,000 chips) Jan04, testing Feb-Jul04

* typical 12 pF, slope 16.5 e/pF

*

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High Occupancy events from Cosmics

ALICE TPC Status, Meeting with LHCC referees 30.6.03 29

ALTRO digital tail cancellation and baseline restoration

PG:PG:

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Front-end Card final version

128 ch

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Front-end Card Status

Completed:Improved features

EEPROM card idImproved Front-end Bus design: multilayer-flexible instead of cableGeographical address

Assembly of prototypeStandalone tests

In progress:Adaptation of cooling platesCharacterization with ROCTest equipment

Production of 4500 FEC Nov03-Aug04, test Apr04-Nov04

Concerns: tight schedule

ALICE TPC Status, Meeting with LHCC referees 30.6.03 32

Readout Control Unit (RCU)

Completed:Production of prototype RCU-2 (small series for test setups)

PCI-card, problems to get them to work reliablyFinal design (standalone RCU): motherboard layout done

In progress:Solve RCU-2 problem (fall-back RCU-1, decision Jul03)Final design (standalone):

DCS/Trigger cards (common for TPC/TRD) under testFPGA firmware till end Aug03System tests from Sep03

Not started yet:Production (216 cards + spares) Apr04 - Jul04Testing Aug04 - Mar05

Concerns: tight schedule

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Schedule Overview