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Development of Silicon Sensors for Tracking Systems: MPD, CBM and BM@N at NICA and FAIR PowerPoint PPT Presentation


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Michael Merkin SINP MSU. Development of Silicon Sensors for Tracking Systems: MPD, CBM and BM@N at NICA and FAIR. The Facility for Antiproton and Ion Research FAIR. Primary Beams. 10 12 /s; 1.5 GeV/u; 238 U 28+ 10 10 /s 238 U 73+ up to 35 GeV/u 3x10 13 /s 30 GeV protons.

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Development of Silicon Sensors for Tracking Systems: MPD, CBM and BM@N at NICA and FAIR

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Michael Merkin

SINP MSU

Development of Silicon Sensors for Tracking Systems:

MPD, CBM and BM@N at NICA and FAIR

Prague, ASI Symmetries and SPIN


The Facility for Antiproton and Ion Research FAIR

Primary Beams

  • 1012/s; 1.5 GeV/u; 238U28+

  • 1010/s 238U73+ up to 35 GeV/u

  • 3x1013/s 30 GeV protons

SIS100: Au 11 A GeV

SIS300: Au 35 A GeV

p-Linac

SIS18

SIS100/300

UNILAC

Secondary Beams

  • range of radioactive beams up to 1.5 - 2 GeV/u; up to factor 10 000 higher in intensity than presently

  • antiprotons 3 - 30 GeV

HESR

Storage and Cooler Rings

  • radioactive beams

  • 1011 antiprotons 1.5 - 15 GeV/c,

  • stored and cooled

CR &RESR

APPA

Technical Challenges

NESR

100 m

  • cooled beams

  • rapid cycling superconducting magnets

  • dynamical vacuum

Prague, ASI Symmetries and SPIN


  • The BM@N challenge :

  • to prove QGP creation through self-amplified long-range spinodial correlations

NICA

BM@N

Booster,

Nuclotron

  • The NICA-MPD challenge :

  • to prove QGP creation in high net baryon density region

SPD

Collider

MPD

Prague, ASI Symmetries and SPIN


The BM@N experiment project

  • measurements of the multistrange objects (Ξ, Ω, exotics)

    & hypernuclei in HI collisions

  • close to the threshold production in the region of high sensitivity to the models prediction

GIBS magnet (SP-41)

TS-target station,

T0- start diamond detector,

STS - silicon tracker,

ST- straw tracker,

DC- drift chambers,

RPC- resistive plate chambers,

ZDC- zero degree calorimeter,

DTE – detector of tr. energy.

Prague, ASI Symmetries and SPIN


MPD detector at NICA

Magnet :0.5 T

T0, Trigger :FFD

Centrality &

Event plane : ZDC

Stage 1 (2017)

TPC, BarrelTOF & ECAL, ZDC, FFD

Stage 2: IT + Endcaps(tracker,TOF,ECAL)

FFD

Tracking (|h|<2):TPC

PID: TOF, TPC, ECAL

0.5<p<1 GeV/c

Prague, ASI Symmetries and SPIN


The CBM experiment at FAIR

Transition

Radiation

Detectors

Resistive Plate Chambers (TOF)

Ring Imaging

Cherenkov

Detector

Electro-

magnetic

Calorimeter

Silicon

Tracking

System

Projectile

Spectator

Detector

(Calorimeter)

Micro Vertex

Detector

Target

Dipole

Magnet

Muon

Detection

System

two configurations: - electron-hadron

- and muon setup

Prague, ASI Symmetries and SPIN


Tracking systems design constraints

  • Coverage:

    • rapitidies from center-of mass to close to beam

    • aperture 2.5° <  < 25° (less for BM_N)

    • 4π for MPD

  • Momentum resolution

    • δp/p  1%

    • field integral 1 Tm,

    • 25 µm single-hit spatial resolution

    • material budget per station ~1% X0

    • No event pile-up

    • 10 MHz interaction rates

    • self-triggering read-out

    • signal shaping time < 20 ns

  • Efficient hit & track reconstruction

    • close to 100% hit eff.

    • > 95% track eff. for momenta >1 GeV/c

  • Minimum granularity @ hit rates < 20 MHz/cm2

    • maximum strip length compatible with hit occupancy and S/N performance

    • largest read-out pitch compatible with the required spatial resolution

  • Radiation hard sensors compatible with the CBM physics program

    • 1 × 1013neq/cm2 (SIS100)

    • 1 × 1014neq/cm2 (SIS300)

  • Integration, operation, maintenance

    • compatible with the confined space in the dipole magnet

Prague, ASI Symmetries and SPIN


System concept

  • Aperture: 2.5° <  < 25° (some stations up to 38°).

  • 8 tracking stations between 0.3 m and 1 m downstream the target.

  • Built from double-sided silicon microstrip sensors in 3 sizes, arranged in modules on a small number of different detector ladders.

  • Readout electronics outside of the physics aperture.

Prague, ASI Symmetries and SPIN


Assessment of tracking stations – material budget

station 4

electronics

sensor: 0.3% X0

r/o cables: 2×0.11% X0

side view

front view

Prague, ASI Symmetries and SPIN


Assessment of tracking stations – sensor occupancy

sensor occupancy := ratio “nb. of hit strips : nb . of all strips“ in a sensor

Y/cm

station 1

Prague, ASI Symmetries and SPIN


Assessment of tracking stations – hit cluster size

cluster of strips := number of adjacent strips in a sensor that fired simultaneously

distribution for full STS

in station 4

mean: 2.7

Prague, ASI Symmetries and SPIN


MPD ITS status

NICA MPD-ITS

Th

Computer model simulations by

V.P.Kondratiev and N.Prokofiev,

SPbSU

Prague, ASI Symmetries and SPIN


Sensor development – involvement of Hamamatsu , an attempt to repeat at vendors in Russia, Belarussia, and Czech Republics

The CBM-MPD STS Consortium: change in sensor production policy – mixed DSSD SSSD structure of STS (based on experience gotton!)

SSSD-sandwich: the Consortium responsibility:

  • Hamamatsu, Japan (42х62),

  • On-SemiConductor, Czech Rep. (62х62)

  • RIMST,RF

  • “Integral”, Belorussia

  • auxiliary chipcable (SE RTIIE)

DSSD: German Party responsibility –

CiS, Erfurt (62х62)

Hamamatsu, Japan(42х62), double metal on P-side

Prague, ASI Symmetries and SPIN


Microstrip sensors

  • double-sided, p-n-n structure

  • width: 6.2 cm

  • 1024 strips at 58 m pitch

  • three types, strip lengths: 2, 4, 6 cm, 4 cm

  • stereo angle front-back-sides 7.5°

  • integrated AC-coupled read-out

  • double metal interconnects on p-side, or replacement with an external micro cable

  • operation voltage up to few hundred volts

  • radiation hardness up to 1 × 1014 neq/cm2

4” and 6” wafers, 300 µm thick

test and full-size sensors

Prague, ASI Symmetries and SPIN


Prototype microstrip sensors

under study: replacement for integrated 2nd metal layer

external on-sensor cable

CBM05

CBM05H4

CBM05H2

Prague, ASI Symmetries and SPIN


Sensor N-side Contact Pads

Prague, ASI Symmetries and SPIN


N-side poly-Si resistors

Prague, ASI Symmetries and SPIN


N-side p-stops configuration

Prague, ASI Symmetries and SPIN


N-side Guard Rings

Prague, ASI Symmetries and SPIN


Sensor P-side 1st and 2nd metal

Prague, ASI Symmetries and SPIN


Sensor P-side 1st and 2nd metal details

Prague, ASI Symmetries and SPIN


P-side Guard Rings

Prague, ASI Symmetries and SPIN


  • 9 structures from CiS:

    • Size 7 x 7 mm2,

    • Active area 5х5 mm2,

    • Thickness - 280 mkm

  • 6 structures from RIMST:

    • Size - 10 x 10 mm2,

    • Active area ~8 x 8 mm2,

    • Thickness 300 mkm

Irradiations Studies

Prague, ASI Symmetries and SPIN


Doses

CiS:

  • 7.3х1010n/сm2,

  • 7.3х1011n/сm2,

  • 1.6х1012n/сm2,

  • 1.0х1013n/сm2,

  • 1.8х1013n/сm2,

  • 6.4х1013n/сm2

  • RIMST:

  • 1.5х1012n/сm2,

  • 1.2х1013n/сm2,

  • 2.1х1013n/сm2

Prague, ASI Symmetries and SPIN


Prague, ASI Symmetries and SPIN


Results

Prague, ASI Symmetries and SPIN


Full Depletion Voltage

Prague, ASI Symmetries and SPIN


  • Good agreement with known data on current degradation for high doses .

  • Not so good for low doses, but might be it because of mistakes in dose measurements.

  • Expected behavior for full depletion voltage

Prague, ASI Symmetries and SPIN


Readout chip STS-XYTER

full-size prototype dedicated to signal detection from the double-sided microstrip sensors in the CBM environment

fast  low noise  low power dissipation

new w.r.t. n-XYTER architecture:

effective two-level discriminator scheme

design V1.0 @ AGH Kraków

UMC 180 nm CMOS

produced 2012

die size 6.5 mm × 10 mm

Prague, ASI Symmetries and SPIN


Thank you for your attention!

Prague, ASI Symmetries and SPIN


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