CMS   TRACKER  SYSTEM TEST
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CMS TRACKER SYSTEM TEST. Outer Barrel –TOB. End cap –TEC. Inner Barrel –TIB. TIB TOB TEC. Different Geometries One Readout Architecture One Powering Sch e ma. Power Supplies and Cables. Power supplies Situated in counting room I mplement a u nipolar scheme

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CMS TRACKER SYSTEM TEST

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Cms tracker system test

CMS TRACKER SYSTEM TEST

Outer Barrel –TOB

End cap –TEC

Inner Barrel –TIB

  • TIB

  • TOB

  • TEC

Different Geometries

One Readout Architecture

One Powering Schema


Cms tracker system test

Power Supplies and Cables

  • Powersupplies

    • Situated in counting room

    • Implement a unipolar scheme

    • PS modules power groups of ~60APV

    • [email protected] =10A, [email protected]=4A [email protected] =14A

    • Each PS module equipped with 2 HV channels for detector bias

  • FloatingLV, HV power supplies of each power group, their Return

  • Lines connected inside the detector to the Common Detector Ground

  • Power Cables 140 m long

    • Voltage drop = 5V

    • Use of sens wires to compensate the voltage drop

    • Multipolar cable with low inductance , high capacitance to minimize voltage overshoots due to current variations


Cms tracker system test

Definition of the System Test

  • The tracker has to enter its production phase

  • Need to validate a complete subset of it

    • Validate designs

    • Tune design details

    • Verify/optimize integration of components

      Focus is not on component characterization, but on

      overall system performance

  • The subsets: (for TIB/TOB/TEC)

  • A number of final modules (sensors +frontend hybrid)

  • integrated on the final mechanical support structure equipped with:

    • interconnectboards

    • optical digital links and electronics for control

    • optical analogue links for readout

    • power supplies + 100m MSCable

    • cooling


Cms tracker system test

What is necessary to prove it works

  • Modules

    • Noise

    • Physics signals (ß-source, Laser), SNR

    • APV settings

    • Detector leakage currents

  • Compare with corresponding measurements taken with individual

  • modules in the “single module setup” (i.e. electrical readout)

  • Analogue readout chain

    • Optical link gain and bias point

    • timing alignment of moduls

    • Noise contributions, Crosstalk, Common mode effects

    • Operation margin

  • Control chain

    • Noise immunity ( Grounding, cabling, shielding)

    • Operation margin

    • Redundancy

  • Long Term Stability and Temperature stability of the system


  • Cms tracker system test

    What is necessary to prove it works

    • Interconnect boards, mother boards

      • Signal Integrity

    • the distribution of the fast control signals: clock, reset and back plane pulses,

    • Power distribution

    • voltage drops; uniformity of supply voltage distribution

    • Behaviour of full loaded system due to sudden variation in current consumption in correlation with:

      • large inductance of the long cables

      • slow reaction time of PSU

  • Protection against over-voltage?


  • Cms tracker system test

    What is necessary to prove it works

    • Mechanics

    • mechanical compatibility of the various components with the mechanical support structure

    • mechanical stress of the modules due to their fixation on cooling system and interconnect boards

    • Deformation upon cooldown due to different CTE´s

    • Ambient parameters

    • temperatures of the modules

    • temp. of various elements

    • humidity in several spots


    Cms tracker system test

    Phase 1 (April-July):Readout of 1 to 6 modules with a complete (analog & digital) optical link; test with prototype PSUs with long cables.

    Phase 2 (July-December): mechanical and electrical integration and tests of a small part of TIB:

    6 double sided modules on Layer #1 cylinder

    12 single sided modules on Layer #3 cylinder

    Tracker Inner Barrel System Test


    Cms tracker system test

    Tracker Inner Barrel System Test


    Cms tracker system test

    Tracker Inner Barrel System Test

    LAB set-up in Florencecopper readout : UTRI+FEDoptical readout: Opto Hybrid + Fiber + Opto Receiver + Diff. Buffer +FED

    PC with

    FED, FEC and TSC

    CCU

    Detector and

    Opto Hybrid

    Interface Board

    (UTRI)


    Cms tracker system test

    Copper Readout

    Noise

    1.47 ADC

    NCh/bin

    60 ADC

    AD counts

    T(ns)

    AD counts

    Optical Readout

    Optical Readout

    AD counts

    NCh/bin

    57 ADC

    • Noise

    • 1.18 ADC

    AD counts

    T(ns)


    Signal to noise

    Tracker Inner Barrel System Test

    Signal to noise

    • Signal equivalent to roughly 2 MIPs

    • Copper readout: S/N =42

    • Optical readout: S/N =48


    Cms tracker system test

    Tracker Outer Barrel System Test

    Patch panel

    InterConnect Bus

    Cooling pipe

    Module frame

    Module support blocks

    The rod components

    InterConnect Cards

    110 cm

    15 cm


    Cms tracker system test

    Tracker Outer Barrel System Test

    • Detailed electrical test of IC bus + IC cards, with 12FE- Hybrids and

    • 8 OptoHybrids (almost full load)

      • Check of the signal integrity

      • Optimization of the impedance matching

      • Measurement of the voltage drop along the bus

      • Test of I2C communication

    • Results

    • The design of IC Bus and IC Cards is correct – signals are very clean

    • A few details have been fixed/optimized

    • Optical link commissioned on a single channel setup

    • Nominal gain of the link verified

    • Optimization of the bias point


    Cms tracker system test

    Tracker Outer Barrel System Test

    Next step:

    Integrate a rod with electrical components and real modules

    Build an Alu box, gas tight, with patch panel for pipes (cooling and dry air)

    and other services (It can house 2 rods)

    Add external temperature

    and humidity probes

    Commission a cooling system

    with C6F14


    Cms tracker system test

    Tracker Outer Barrel System Test

    Current status:

    • All modules working properly and read out under bias

    • External temperatures probes also read out

    • Cooling running smoothly

    • Grounding scheme similar to the “final” one implemented

    • Now ready to start quantitative measurements

    Further steps

    • Study sensitivity to noise on the power lines / grounding

    • Go to the tracker operating temperature

    • Install 12 detectors in the second rod (DS rod)

    • Add a second rod


    Cms tracker system test

    Tracker Endcap System Test

    Front petal

    • 28 Si-detectors

    • 28 FE hybrids

    • 28 Optohybrids

    • 2 CCUM

    • 4 IC Boards

    B-side

    A-side

    front petalback petal

    3 power groups : 1. Ring #1, #2 48 APVs 24 APVs

    2. Ring #3, #4, #6 44 APVs 32 APVs

    3. Ring #5, #7 44 APVs 56 APVs


    Cms tracker system test

    Tracker Endcap System Test

    • Design verification of petals

      • mechanics, done

      • electrical performance of the interconnect board, done

      • deformation after cooldown tested

    • System test in 4 steps:

    • Test of the 2nd detector group (rings #3, #4, #6)

    • Test of the 3rd detector group (rings #5, #7)

      • Fully equipped but without Si-Sensors,

  • Test of the 1st detector group (rings #1, #2)

    • Fully equipped but without Si-Sensors,

  • Results expected by the end of this year

  • Full System Test for Front and Back petal

    • fully equipped with Sensors and front end electronics

    • with final cables and power supplies

  • Final results expected in spring 2003


  • Cms tracker system test

    Tracker Endcap System Test

    Test of the mechanical compatibility

    Digital Optical Hybrid

    R#7

    Interconnect Board

    R#6

    Analogue Optical Hybrid

    R#5

    R#4

    Frontend Hybrid

    R#3

    R#2

    R#1


    Cms tracker system test

    First optical readout of TEC Module: Lyon


    Cms tracker system test

    Tracker Endcap System Test

    Signal Integrity

    Differential Bunch Clock Pulse

    Reset Pulse

    • Over-voltage measurements

    • Behaviour of full loaded system due to sudden variation in current consumption (switching off the frontend hybrids)

      • over-voltage swing due to inductance of the long cables

      • over-voltage gradient due to slow reaction time of the PSU


    Cms tracker system test

    Tracker Endcap System Test

    Setup for the Measurements of the Over-voltage


    Cms tracker system test

    Overvoltage measurements

    C250 = 60 µF, C125 = 40 µF

    • Over-voltage swing due to

    • cable inductance

    • Commercial power supplies

    • Sense wires not connected

    • Cable Length = 100m

    • Different dumping capacitances

    V2.50

    V1.25

    I250 = 1.2 A

    I125 = 0.52A

    C250 = 330 µF, C125 = 330 µF

    C250 = 740 µF, C125 = 740 µF

    V2.50

    V2.50

    V1.25

    V1.25

    I250 = 1.0 A

    I125 = 0.52 A

    I250 = 2.75 A

    I125 = 0.84 A


    Cms tracker system test

    Over-voltage measurements

    • Overvoltage gradient

    • due to slow regulation time of PSU

    • senses wires connected

    • commercial power supply

    • dumping capacitance 700µF

    • cable 100m, U = 0.8V

    • 4 frontend hybrids toggled; I = 2A

    • Overvoltage .4 V above the limit

    • Over voltage is a potential problem.

      • Overvoltage gradient requires :

        • special power supply design or

        • radhard voltage limiter located close to detector

        • could be reduced by proper system architecture

      • Overvoltage swing could be fixed by:

        • reasonable damping capacitance on the interconnect boards


    Cms tracker system test

    Conclusions and Remarks

    • System test is underway for TIB/TOB/TEC

    • The goal is to test an overall performance of a complete subsystem:

    • Si-Modules + FE-electronics

    • / analogue optical links / digital control links /long cables /

    • power supplies /monitoring

    • It´s intended to be a step by step process

    • All sub-components will be integrated as soon as they are

    • made available

    • First TOB Rod is integrated, ready to start quantitative

    • measurements

    • Final results for all detectors are expected by the

    • beginning of 2003


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