atlas sct status report

AOW 2003 Prague - SCT Report Z. Doležal 116-Sep-03

ATLAS SCT Status Report

Overview of major production issues Silicon sensors & FE ASIC procurement Power & Readout

Power supplies Readout DAQ & DCS

Barrel Barrel modules Barrel Harnesses Barrel Engineering

Endcap Endcap modules Endcap Engineering

Testbeam

Schedule & critical issues


SCT silicon sensors procurement

Production & acceptance testing of the silicon sensors is ~ complete

Quality of the detectors is excellent All quantities within specification Hamamatsu barrel detector summary

Very low leakage currents

Typically <200 nA at 500V bias at 20oC

>99.9% good readout strips

CIS detectors: some IV problems

0.2 A # defects


SCT ASIC procurement

Post irradiation studies indicate 10years lifetime @ LHC

Production stopped by ATMEL

Use ASICs with 1 ch. out of specs

wherever reasonable (possible): qualification, rework, etc.

Wafers delivered 1053

Wafers accepted (Yield >10%) 798

Yield of the accepted wafers is 26%

Fraction of wafers rejected 24%

Number of die accepted 53K

% of total requirement (61.5K) ~86%

Die with 1 channel out of spec ~24%


SCT Readout & Power system

System specification 4088 modules x 1536 channels 6 x 106 readout channels 40 kW power 100 m detector control room

Readout =RODs

48Channels/VME card Pre-series of 7 cards being evaluated

+BOC Optoelectronic Back of crate cards First 10% batch in production Custom Opto-packages in production in

Taiwan

+ TIM Available for assembly

+Crates, backplanes &SBC

+Optical fibres

System status All elements prototyped and ATLAS

PRR completed Readout & power needed for testing

during assembly

Power & Cables =LV0 cards (Prague)

4 channels/card 10% production delivered and burned in

+HV0 cards 8 channels/card 10% production launched

+Backplane, 48V &5V power supplies

+Crate controller, crates

+Patch-panels PP3 with filters & limiters on ATLAS

+Cables 4 types Tender started in August


SCT Power system schematic

PS CRATE

PP3 (4088)COMMON MODE CHOKES

VOLTAGE LIMITER

PP2Factory SPLICE

PPB1 orPPF1

PPF0END-CAP ONLY

DETECTORMODULE

(4088)

48 VDC POWER PACK

CC

INT

ER

LO

CK

6 H

V C

AR

DS

12 L

V C

AR

DS

PS CRATE (4)

DCS INTERLOCKMATRIX

DCS VIA CANbus

EARTH TIE Near PP3

SINGLE POINT EARTH

LOW MASSPOWER TAPE

LOW MASS POWER TAPE

TYPE II CABLE

TYPE III CABLE

TYPE IV CABLE

PS RACK (22)


SCT Module Design (Endcap)

strip direction

strip direction

4 wedge shape silicon sensors

768 p-in-n strips,single sided

supplied by Hamamatsu and CiS

sensor alignment < 5µm

40mrad stereo angle

SPINETPG bar for heat removal(1700 W/m/K)

AlN wings for mechanical stability

hybrid connected to sensors only by fanins thermal split12 ABCD3TA

binary read-out chips

hybrid:flex circuit on carbon-carbon


SCT Barrel modules

Barrel modules are in production

Barrel module PRR May 01 Silicon sensor production complete May 03 Barrel module PAR May 03

Hybrids complete (target) Aug 03 1214/2500 (49%) Baseboards complete (target) Oct 03 1481/2530 (59%)

Modules-Japan 445/ 786 (57%) Modules-UK 144/ 549 (26%) Modules-US 104/ 483

(21%) Modules-Scand (qualification soon) 31/ 404 ( 8%) Total (2112+5%) 734/ 2218 (33%)

Modules complete (target) Apr 04

Production goal is to complete by Apr 04 with a yield > 90%


SCT Barrel baseboard & hybrid production

Production rate is under control – (recently stalled, but recovered)


SCT Barrel module assembly

Note : Backup slide on s-curves Critical issues:

Get all clusters into production Production yield > 90%


SCT Barrel Optoharnesses

Opto-harnesses are in production Barrel LM tape production complete First 2 batches of 8 harnesses each for Barrel-3 evaluated Start-up delay was caused by ESD damage to DORIC ASIC

& other production issues Start of production recommended

Schedule can be recovered (complete production by the end of 2003)


SCT Barrel Engineering – Support Structure

All 4 CF cylinders delivered …but there are ~40000 small

parts!

B3 delivered to RAL B4,5,6 assembly test starting


SCT Barrel Engineering - Cooling

Design is finalised 48 module units CuNi with soldered joints

Concept tested on sector

Cooling design is evolving; which causes delays

Production is ready to start


SCT Barrel Engineering - Assembly

Assembly phases1. Spindle & service

cagesUnderway

2. FSICompleted

3. Opto-harnessesDelivered

4. CoolingWaiting cooling

5. ModulesModules available

Oxford Assembly site almost ready

4 months late

B3 harness assembly at RAL


SCT Endcap Modules

Modules Endcap module FDR & PRR Aug 02 & Dec 02

Module design was validated as suitable for production Thermal & electrical performance validated

Production Hybrids

Hybrid production & assembly transferred to industry Pre-series of 200 in production 44(+48) delivered, remaining show

delamination problems Full order for 2300 placed (2500 in total)

Spines 229 produced by Protvino/MPI, but with low quality Contract for 2500 issued

Module assembly 3 out of 7 production sites qualified for production 1rst modules within specification Aim is to have all sites qualified in 2 months Target is to complete module production in Dec 04

•


SCT Endcap hybrid & module production

CICORELHybrid SA

CERN Cracow

RAL

Freiburg

Geneva/CERN

Melbourne

UK

Valencia

NIKHEF

MPI/Prague

Freiburg

Producer Reception Hybrid QAModule

Assembly


SCT Endcap Modules

Hybrid production is starting – need industry to sort out quality problems and achieve required rate

Spine production is critical Other components are ~ OK (with additional collaboration effort) Rapid cluster qualification is critical Aggressive production plan being developed (see backup)


SCT Endcap Endcap Engineering - Structure

Support structures CF support cylinders & disks

ordered First support cylinder shown

Scheduled delivery Aug 03 Problems with wings which

will cause 3-4months delay

First 4 discs delivered Scheduled completion Dec 03 Again many small parts


SCT Endcap Endcap Engineering - Cooling

Cooling Design is finalised & prototyped Production of cooling circuits ready to

start

Services Harnesses expected now LM tapes & PPF0 prototyped


SCT Testbeam 2002/3 & 2004

Understanding of intrinsic performance of an increasing number of real modules with final components

June 2002, 2 weeks July 2002, 2 weeks August 2002, 2 weeks May 2003, 2 weeks including 25ns measurements September 2003, ~2 weeks; irradiated modules; common DAQ run 2004 – Plans for tracking; common DAQ


SCT Testbeam 2002/3(preliminary)


Example of a second track due to hard interaction with silicon.

SCT Testbeam track finding studies(preliminary)

Example of a track reconstructed in telescope & 4 planes

effic

ienc

y


SCT schedule & Critical issues

Barrel SCT (ready for integration 15/12/04; ID ready 22/05/05) Modules ~33% complete ~3 months delay Full production all clusters

Yield is critical Harnesses ~1% complete ~4 months delay Barrel-3 complete ~3 months late B3 services ~4 months late

B3 assembly start ~5 months late

Endcap SCT (ready for integration 01/03(05)/05; ID ready 16/08(10)/05) Current schedule delivers the Endcaps 2 & 4 months late wrt baseline

Modules Starting production Spines critical Harnesses Started Disc-9 To be delivered now ~4 months late Critical D9 services Most orders placed ~6 months late Critical

D9 assembly start ~5 months late

Power, Readout & cables are OK for the experiment but critical for use during assembly


Invitation For The Lab Tours

A Strip Detector Lab - Institute of Physics AS

Strip detectors for ATLAS LVPS

SCT Lab - Charles University End Cap Module Production

B Semiconductor Lab - CTU, IEAP

End Cap Module Production


Backup - SCT ABCD Yield

ABCD Wafer Test Results

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

(New EPI Starts at Z40859; Fabrication Pause between Z41183 and Z43160.)

Yield of Accpeted Wafers

Percentage of Wafers Returned

Yield Guarantee


Backup - SCT Barrel Hybrid (Pitch adaptor problem)

2500 hybrids are required to produce the 2112+5% barrel modules As of June 1st, 1333 hybrids have been produced; Of these:

~ 200 have problematic pitch-adaptors . First problems were seen at about hybrid number 400, and then again after about hybrid 1200.

The problem is in the Aluminium metallization (on glass substrates). The 2nd encounter was very severe and the vendor could not reproduce

the previous good metallization even after numerous trials.

An alternative vendor has been identified and the quality of the PAs is being cross-checked by barrel clusters before resuming production.

Although the delivery of hybrids had stopped for 2-3 months, the hybrid production excluding the last PA attachment has continued .

Once the PA production is on track, the hybrid delivery will be much faster.


Backup - SCT Module s-curves The SCT uses binary electronics and is calibrated using threshold scans i.e. the occupancy is

measured as a function of the threshold level. With no injected charge this gives the noise occupancy Charge injection via a calibration capacitor gives efficiency

On some fraction of the modules the noise occupancy curves below the operating point of 1fC have ‘distorted s-curves’

No significant differences seen in modules between standard modules and those with distorted s-curves. All noise occupancy values are more than factor 10 less than the specification

All ASICs Module Average

Link 0 average Link 1 average

Log(Occupancy) at 1fC (83 ref modules)

All ASICs Module Average

Link 0 average Link 1 average

Log(Occupancy) at 1fC (25 distorted-s modules)


SCT Endcap Module Production Plan

Module Production

0

20

40

60

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120

140

160

180

200

abr-

03

jun-

03

ago-

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oct-

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Inner - Freiburg (H)

Inner - Freiburg (C)

Inner - NIKHEF

Inner - UK

Middle - VLC (short)

Middle - MPI (short)

Middle - Valencia

Middle - UK

Middle - MPI

Outer - Melb.

Outer - Geneva

Outer - Valencia

Outer - UK

atlas sct status report

Documents

readout channels40

modules x

crate cards

atlas cables

atlas prr

dummy loads modules

assembly crates

wafers delivered1053wafers