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 für Kernphysik, Goethe University Frankfurt 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 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 2
The Micro-Vertex-Detector of the CBM experiment Key Requirements 0x3 0x2 Vertexing resolution: 50 µ m along 0x1 beam axis 0x0 Material budget: 0.3% to 0.5% X 0 per station Heat sink R/O Hit rates, radiation tolerance, … Illustration of an MVD Quadrant 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 3
The CBM Momenta Distributions and the Central Role of the Material Budget for 2 nd -ary Vertexing Momenta of rare probe particle decays at SIS100 energies • 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 µ m) pixel sensors (MAPS) • As a consequence: Comples Cooling [PhD Thesis, Tobias Tischler] 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 4
Sensors: Monolithic Active Pixel Sensors A precursor: MIMOSA-26 Final Sensor for the CBM-MVD: MIMOSIS-1 Some Required Sensor Properties Spatial Resolution of ~ 5 µ m Radiation hardness: few 10 13 N eq / 3 Mrad Peak Hit Rate: 7 × 10 5 / mm 2 / s Peak Data Rate: 1.6 Gbps / cm 2 Read-out area insensitive Full Sensor Dimensions: 3x1.3 cm 2 (3x0.3 cm 2 ) Sensitive Area: 3x1 cm 2 Power Consumption: < 200 mW/cm 2 Sensitive Area (3x1 cm 2 ) 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 5
Sensor Arrangement / Segmentation of the MVD 0x0 0x1 Single Stations 8 sensors 40 sensors CVD Front view 0x2 0x3 160 sensors 84 sensors TPG Cross section of a quadrant CVD diamond / TPG 10:1 1:1 Heat Sink Sensors Glue Cables 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 6
The PRESTO Project PRE cursor of the S econd s T ati O n Quadrant size of the second station, fully equipped with sensors. Aimed to reach the complexity of the 3 rd 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 y • Electrical validation of the thin read-out cables & sensor connectivity x • Prove vacuum operation • Validate TPG as carrier material for the bigger stations 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 7
The PRESTO Project – Probe Testing Probe testing • Probe card equipped with standard tungsten needles • Placing the needles with an overdrive of 100 µ m. • 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 Threshold [JTAG units] each individual pixel 1 JTAG unit = 250 µ V – Determination of malfunctioning pixels • Standardized test protocol now established 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 8
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”) 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 9
The PRESTO Project – Positioning and Gluing (2) Carrier Gluing • TPG as for Station • RAL 247 : A dedicated radiation hard, 0x2 and 0x3 low viscosity glue • Bare (w/o parylene coating) • Well defined amount of glue required for achieving bubble- free results – 5 µl seem to be appropriate for a 50 µm thin 2x1.3 cm 2 M-26 sensor on CVD Diamond – 8 µl required for gluing onto TPG carrier 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 10
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/X 0 ~ 0.05% at maximum • Positioning using marker holes • Study to explore how far x/X0 could be pushed with x/X 0 [%] industrial standard technology (Cu); Al-based cables vs. x and y [mm] in reach, e.g. together with CBM-STS Blue ≤ 0.3 X 0 Green ≤ 0.5 X 0 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 11
The PRESTO Project – Cables (2) Positioning Tools for placing the cables in action: Wire bonding machine connecting the sensors to the cables: 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 12
The PRESTO Project – Cables (3) Electrical Evaluation CLK • An eye diagram measurement of the LVDS @80MHz data transmission through the new single-layer cable showing: – Eye opening of > 470 mV – Reliable Data Transmission @ 80 MHz DATA – 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. Note: – extending the feedback loop of the power Connected sensor (M-26) supplies right until the sensor NOT the final sensor – raising power supply voltage by 0.2 / 0.3 V ↓ → less prone to oscillations and easier to We need to focus on evaluating achieve and forcasting properties of the cable with a higher speed, lower power sensor. 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 13
The PRESTO Project – Thermal management (1) 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 CO 2 cooling required – Thermal contact (method) needs evaluation Upcoming heatsink iteration: quadrant sized 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 14
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 µ m) 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 MVD test vessel IR Camera Heat sink w/ VarioCAM HR Pt100 measurement 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 15
The PRESTO Project – Vacuum Performance Tests operating PRESTO in a Vacuum of < 10 -3 mbar were done Temporal noise Fixed-pattern noise Sensor Section (Bank) A B C D • No performance loss observed after several pressure cycles ✓ Vacuum Suitability / Vacuum Compatibility shown No performance loss observed after several pressure cycles 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 16
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 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 17
Excursion (1) Temperature Measurements with Pt100 in Vacuum 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 • 12 Pt100 sensors in vacuum 3D rendering of the board Optional color screen on backside 23 Mai 2016 Philipp Klaus | PRESTO: A precursor of the Micro-Vertex-Detector for the CBM experiment at FAIR 18
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