J.M. Heuser – CBM Silicon Tracking System 1

Roadmap for the development of Roadmap for the development of STS module demonstratorsSTS module demonstrators

Concept

Common interfaces/dimensions

Some technical questions

Johann M. Heuser

STS Workgroup MeetingCBM08 JINR Dubna, 15 October 2008

J.M. Heuser – CBM Silicon Tracking System 2

GSI detector test board – "Demonstrator 0"GSI detector test board – "Demonstrator 0"

p-side

Bias connectionsBias connections

Bonding scheme, AC-pads

Start-up of silicon lab activities at GSI

First glimpse on detector performance

Compatible with connection to n-XYTER kit

10 cm

J.M. Heuser – CBM Silicon Tracking System 3

Reference tracking station - under design Reference tracking station - under design "Demonstrator 0a""Demonstrator 0a"

multi-purpose, 1-chip "n-XYTER kit"

2-chip board

PANDA GEM TPC4-chip board, "CBM ref. tracking station"

Cooperation with GSI Detector Lab on n-XYTER readout:

Chr. Schmidt, R. Lalik

Three projects:

(GSI)

J.M. Heuser – CBM Silicon Tracking System 4

Kharkov/Dubna test board – "Demonstrator 0b"Kharkov/Dubna test board – "Demonstrator 0b"

detector CBM01B2

contacts to 2 256 strips

connection of strips to ERNI connectors via micro-cables

readout via 2 2n-XYTER kit boards

First steps towards using micro-cables:

Testbeam at IHEP Protvino, 11/2008

10 cm

Under design (V. Borshchov et al, SE SRTIIE)

CBM01B2

J.M. Heuser – CBM Silicon Tracking System 5

Kharkov/Dubna test board – "Demonstrator 0b"Kharkov/Dubna test board – "Demonstrator 0b"

(V. Borshchov et al, SE SRTIIE Kharkov)

... produced 9/2008

J.M. Heuser – CBM Silicon Tracking System 6

Towards "Demonstrator 1"Towards "Demonstrator 1"

First steps towards using small detector system ("ladder"):CBM-MPD STS Consortium

FEB prototype

Define in a tech document: specs of sensors + cables

For 2009

J.M. Heuser – CBM Silicon Tracking System 7

Layout of the moduleLayout of the module

FEB prototype

Defining the interfaces:

1) Microstrip detectors

p side (stereo angle 15 deg)

o o o o o o

n side (strips parallel to edge)

Min. distance for analog cables + |tab bonding ?

?

new detector designs: 1024 strips, pitch ~ 60 µm (fine-tuning, e.g. 58 µm) depending on max. detector width on 4" wafer.

existing CBM01: 1024 strips, pitch 50.7 µm

distance depending on space for poly-Si bias resistors

AC pads ~ 80 x 200 µm

J.M. Heuser – CBM Silicon Tracking System 8

Layout of the moduleLayout of the module

FEB prototype

8 n-XYTER chips + ADC

+ voltage regulators

+ connector-out

Si substrate

Defining the interfaces:

2) Front-End Board

non-structured back-side: good for cooling

r/o chips bump-bonded, face-down

8 x 128 precision input lines, Al on Si, 50.7 µm pitch

that's the primary motivation for the Si substrate !!!

component side: Al lithography 1 or 2 layers,

gold plated where necessary, discrete power

lines if required

Project at GSI

technical details of Si substrate to be explored, e.g. with IMEC, Belgium

J.M. Heuser – CBM Silicon Tracking System 9

Technology for Front-End BoardTechnology for Front-End Board

J.M. Heuser – CBM Silicon Tracking System 10

Layout of the moduleLayout of the module

FEB prototype

Defining the interfaces:

3) Analog cables

Three applications:1. short readout cables2. long readout cables3. daisy-chain cables

in two versions: for p and for n-side of detectors

and for two kind of detectors:new design iteration (with ~ 60µm strip pitch)fallback: CBM01 (with 50.7µm strip pitch)

12 different cable layouts12 different cable layouts rather similar layout but nevertheless different just small quantities needed should fit on a few Al sheets

J.M. Heuser – CBM Silicon Tracking System 11

Layout of the moduleLayout of the module

FEB prototype

Defining the interfaces:

3) Analog cables

3.1) daisy-chain cables:

- maybe ~1 cm long

- single layer with 50.7/60µ line pitch in principle, but maybe not possible on stereo side due to overlap of lines >> to be double-checked<<

double-layer instead (effectively: two single cables with twice the line pitch)

!!seems much easier to achieve!!

1a) 1024 lines, pitch 100 µm, for p-side "/"

1b) 1024 lines, pitch 100 µm, for n-side "|"

2a) 1024 lines, pitch ~120 µm, for p-side "/"

2b) 1024 lines, pitch ~120 µm, for n-side "|"

to be drawn with correct aspect ratio

single-layer cable

double-layer cable

100/120µm

50.7/60µm

100/120µm

upper layer

lower layer

p-side

p-side

similar for n-side but with straight contacts

J.M. Heuser – CBM Silicon Tracking System 12

Layout of the moduleLayout of the module

FEB prototype

Defining the interfaces:

3) Analog cables

3.2) long readout cables:

- maybe ~15 cm long

- double-layer cable (effectively: two single cables)

1a) 1024 lines, pitch 100 µm, for p-side "/"

1b) 1024 lines, pitch 100 µm, for n-side "|"

2a) 1024 lines, pitch ~120 µm, for p-side "/"

2b) 1024 lines, pitch ~120 µm, for n-side "|"

to be drawn with correct aspect ratio

double-layer cable

100/120µm

100/120µm

upper layer

lower layer

100/120µm

100/120µm

upper layer

lower layer

p-side

n-side

J.M. Heuser – CBM Silicon Tracking System 13

Layout of the moduleLayout of the module

FEB prototype

Defining the interfaces:

3) Analog cables

3.3) short readout cables:

- maybe ~4 cm long

- double-layer cable (effectively: two single cables)

1a) 1024 lines, pitch 100 µm, for p-side "/"

1b) 1024 lines, pitch 100 µm, for n-side "|"

2a) 1024 lines, pitch ~120 µm, for p-side "/"

2b) 1024 lines, pitch ~120 µm, for n-side "|"

short version of the long readout cables

J.M. Heuser – CBM Silicon Tracking System 14

Sensors / CablesSensors / Cables

Re-defining the interfaces:

n-side p-side n-side p-side

0° 15° -7.5° +7.5°

STS performance simulation still pending

J.M. Heuser – CBM Silicon Tracking System 15

Demonstrator 2 (family) ?Demonstrator 2 (family) ?

what to demonstrate ?

full-size ladder ?

radiation hard sensors ?

sensor cooling ?

mechanical stability ?

system integration ?