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PRESTO: A Vacuum-compatible, ultra-low material budget precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR Philipp Klaus on behalf of the CBM-MVD Collaboration Institut fr Kernphysik, Goethe University Frankfurt 23 Mai

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

PRESTO: A Vacuum-compatible, ultra-low material budget precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Philipp Klaus

  • n behalf of the CBM-MVD Collaboration

Institut für Kernphysik, Goethe University Frankfurt

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Outline

  • The Micro-Vertex-Detector of the

CBM experiment

  • The PRESTO project
  • Selected Issues

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The Micro-Vertex-Detector of the CBM experiment

Key Requirements

Vertexing resolution: 50 µm along beam axis Material budget: 0.3% to 0.5% X0 per station Hit rates, radiation tolerance, …

Heat sink R/O

0x0 0x1 0x2 0x3

Illustration of an MVD Quadrant

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The CBM Momenta Distributions and the Central Role of the Material Budget for 2nd-ary Vertexing

  • Low momenta dominate the distributions

precision of vertexing and tracking limited by multiple scattering (material budget)

  • Measures to reduce material budget:
  • Vacuum operation
  • Use of thinned (50 µm) pixel sensors (MAPS)
  • As a consequence: Comples Cooling

[PhD Thesis, Tobias Tischler] Momenta of rare probe particle decays at SIS100 energies

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Sensors: Monolithic Active Pixel Sensors

A precursor: MIMOSA-26 Some Required Sensor Properties Spatial Resolution of ~ 5 µm Radiation hardness: few 1013 Neq / 3 Mrad Peak Hit Rate: 7×105 / mm2 / s Peak Data Rate: 1.6 Gbps / cm2 Full Sensor Dimensions: 3x1.3 cm2 Sensitive Area: 3x1 cm2 Power Consumption: < 200 mW/cm2 Final Sensor for the CBM-MVD: MIMOSIS-1

Sensitive Area (3x1 cm2) Read-out area insensitive (3x0.3 cm2)

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Sensor Arrangement / Segmentation of the MVD

Single Stations

Cross section

  • f a quadrant

0x0 0x1 0x2 0x3 8 sensors 40 sensors 160 sensors 84 sensors CVD TPG Front view

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Sensors Glue Cables CVD diamond / TPG Heat Sink 10:1 1:1

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project

PREcursor of the Second sTatiOn

Quadrant size of the second station, fully equipped with sensors. Aimed to reach the complexity of the 3rd station:

  • Number of sensors in a row
  • Overlapping cables on each sides

Targets

  • Double-sided integration of multiple sensors

arranged in sensor ladders – Evaluate procedures and yield

  • Establish quality assurance procedures
  • Electrical validation of the thin read-out

cables & sensor connectivity

  • Prove vacuum operation
  • Validate TPG as carrier material for the bigger stations

y x

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Probe Testing

Probe testing

  • Probe card equipped with standard tungsten

needles

  • Placing the needles with an overdrive of 100 µm.
  • After ~100 probe tests realignment of the

needle card required

  • Measurements of transfer functions to

characterize the sensors – Estimation of the noise and the threshold of each individual pixel – Determination of malfunctioning pixels

  • Standardized test protocol now established

Threshold [JTAG units]

1 JTAG unit = 250 µV

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Positioning and Gluing (1)

Positioning

  • Customized tools allowing for butted sensor positioning

– Fixation of the positions of the sensors and the carrier using low pressure (“vacuum”)

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Positioning and Gluing (2)

Carrier

  • TPG as for Station

0x2 and 0x3

  • Bare (w/o parylene coating)

Gluing

  • RAL 247: A dedicated radiation hard,

low viscosity glue

  • Well defined amount of glue

required for achieving bubble- free results – 5 µl seem to be appropriate for a 50 µm thin 2x1.3 cm2 M-26 sensor on CVD Diamond – 8 µl required for gluing onto TPG carrier

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Cables (1)

Cables fabricated as FPCs

  • One single-layer FPC to connect two MIMOSA-26 sensors
  • Special emphasis on low-material budget

– Single layer, impact on impedance matching to be studied – Based on copper x/X0 ~ 0.05% at maximum

  • Positioning using marker holes
  • Study to explore how far x/X0 could be pushed with

industrial standard technology (Cu); Al-based cables in reach, e.g. together with CBM-STS

x/X0 [%]

  • vs. x and y [mm]

Blue ≤ 0.3 X0 Green ≤ 0.5 X0

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Cables (2)

Positioning Tools for placing the cables in action: Wire bonding machine connecting the sensors to the cables:

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Cables (3)

Electrical Evaluation

  • An eye diagram measurement of the LVDS

data transmission through the new single-layer cable showing: – Eye opening of > 470 mV – Reliable Data Transmission @ 80 MHz – Rise and fall times of ~1.7 ns allow for transmission at 320 MHz / Mbps in a later chip generation

  • But power loss (= voltage drop) accross the

power lines is not negligible. – extending the feedback loop of the power supplies right until the sensor – raising power supply voltage by 0.2 / 0.3 V → less prone to oscillations and easier to achieve

CLK DATA @80MHz

Note:

Connected sensor (M-26) NOT the final sensor ↓ We need to focus on evaluating and forcasting properties of the cable with a higher speed, lower power sensor.

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Heat Evacuation

  • Sensors:

– Temperature range: -40 to -20 ºC (due to noise/radiation damage....)

  • Carrier:

– CVD Diamond (first two stations) and TPG (last two stations): low radiation length, highly heat-conductive sensor carrier

  • Heat sink:

– Liquid cooled aluminum-based heat sinks – Conventional Glycol based cooling fluids suffice, no CO2 cooling required – Thermal contact (method) needs evaluation

The PRESTO Project – Thermal management (1)

Upcoming heatsink iteration: quadrant sized

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Thermal management (2)

In-vacuum temperature measurements

  • Mandatory evaluation of the cooling concept in vacuum
  • Results to cross-check simulations done so far
  • Contact-free measurement using an infra-red camera (λ = 7 – 14 µm) and a

4mm Ge vacuum window (4mm) with BBAR coating (mean transmittance τ = 97%)

  • Heat sink connected to a cooling system providing cooling liquid temperatures from
  • 20 °C to 30 °C

IR Camera VarioCAM HR MVD test vessel Heat sink w/ Pt100 measurement

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project – Vacuum Performance

Tests operating PRESTO in a Vacuum of < 10-3 mbar were done

  • No performance loss observed after several pressure cycles

✓ Vacuum Suitability / Vacuum Compatibility shown No performance loss observed after several pressure cycles

A B C D

Sensor Section (Bank)

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Temporal noise Fixed-pattern noise

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The PRESTO Project - Summary

The PRESTO project

  • Development of tools and procedures to integrate several sensor ladders
  • Proof vacuum-compatible operation
  • Characterization with respect to

– Assembly precision (yield) – Carrier Suitability(TPG) – Cooling – Noise (FPC)

  • VCI 2016 contribution / NIM A proceeding accepted today
  • To be continued with front-side assembly

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Excursion (1) Temperature Measurements with Pt100 in Vacuum

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We developed a custom board for precision temperature measurement with Pt100 sensors inside a vacuum chamber:

  • Compact board made to work well in vacuum.
  • One board to connect to eight Pt100 sensors (“three wire” measurement)
  • Only four signal lines required to be fed through a flange for power and data
  • Multiple boards can be connected together via daisy chaining
  • Rather low cost (< 40 EUR per board)
  • Let us know If you are interested

Optional color screen on backside 3D rendering of the board 12 Pt100 sensors in vacuum

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Excursion (2) Applying Our Integration Techniques to the NA61/SHINE SAVD

SAVD: Small Acceptance Vertex Detector M.Koziel and M.Deveaux In Collaboration with the NA61/SHINE Vertex Detector Group

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Selected Issues

Procedures and Strategies

Reworking vs Perfect Results

  • Granularity and coverage of QA?

Quality assurance on the full quadrant size level

  • Cost effective metrology on max. 15x15 cm2 planar carrier, markers?
  • Initial precision required in xyz for software alignment? 10 um? 50 um?

Materials and Handling

CVD Diamond ✓ TPG ✓ Parylene Coating?

  • How to optimize heat contact between CVD diamond/TPG and Al heatsink?
  • Parylene: glue compatibility, surface QA, suitability for electrical insulation?

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

Selected Issues - Production of Masks for Integration

Goal: preventing glue from intruding keep-out zones Our plan: Use of a commercial cutting plotter Silhouette Cameo-2 Achieved : full programmatic control of the cutting plotter Problems encountered:

  • adhesive layer of the masks sticking to cutting mat
  • metallized masks hard to cut
  • lack of low thickness mask materials

Illustration of a mask as wanted To produce Single-use masks

Mask Cutout

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The MVD of CBM – Partners & Synergies

Research Partners

IPHC (Strasbourg/M. Winter) Sensor development RAL Rutherford Appleton Lab. Glue development Hochschule Rhein-Main Lithography on CVD Diamond wafers Fraunhofer IGB Parylene

Technical synergies with experiments

STAR HFT Sensor integration & probe testing (similar sensor family) ALICE ITS Similar sensor technology (Tower Jazz high-res. CPS families) CMS FPIX Carbon fiber encapsulation of the carrier material (TPG) PANDA Luminosity Detector Similar operation conditions (large area CVD diamond carrier) HADES Read-out network TRBnet NA61/SHINE Vertex Detector Integration and Commissioning

Industry Partners

Momentive Diamond Materials Cool Tec Electronic GmbH ILFA GmbH Optigraph GmbH TPG Carriers CVD Carriers Cooling FPCs / Cables TPG Carriers & parylenecoating VACOM BBAR IR vacuum window

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HTT GmbH probe cards

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23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR

The CBM-MVD Collaboration

AG Prof. Dr. Joachim Stroth (Goethe University FFM) Group of Prof. Marc Winter (IPHC Strasbourg)

Tobias Bus, Michael Wiebusch, Erik Krebs, Joachim Stroth, Christian Müntz Gisa Kretzschmar, Philipp Klaus, Dennis Doering, Benjamin Linnik, Samir Amar-Youcef Qiyan Li, Michal Koziel, Michael Deveaux, Tobias Tischler, Philipp Sitzmann Not present: Jan Michel

Thank you for your attention!

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