The ATLAS Strip Detector System Not reviewed, for internal - PowerPoint PPT Presentation

The ATLAS Strip Detector System Not reviewed, for internal circulation only for the High-Luminosity LHC Arturo Rodriguez Rodriguez On behalf of the ATLAS ITk Strip Community Instrumentation for Colliding Beam Physics Novosibirsk, Russia 24 - 28 February, 2020 Albert-Ludwigs-Universität Freiburg

Future of the LHC Not reviewed, for internal circulation only Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 2

ATLAS upgrade. Why? Not reviewed, for internal circulation only HL-LHC ℒ 𝑗𝑜𝑢 ~ 4000 fb −1   Requires increased radiation hardness  Pile-up from ~50 to ~200  Requires increased granularity to maintain the current performance  Faster readout, higher data bandwidth  Increase 𝜃 coverage of tracking to 4 Collected Charge [10 3 electrons] HL-LHC fluence n-in-p-Fz (1700V) 25  LHC (25 vertices)  20 n-in-p-Fz (800V)    15    10  HL-LHC (200 vertices) 5 n-in-p-Fz (500V) p-in-n-FZ (500V) 10 14 10 15 10 16 5 5  eq [cm -2 ] New all-silicon Inner Tracker (ITk) Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 3

ATLAS ITk Strip Detector Not reviewed, for internal circulation only  ITk Detector  All-silicon tracking detector  Pixel and strips  Total area of silicon ~ 180 m 2  10 times the current number of readout channels  ITk Strip Strip barrel Strip end-cap  Barrel and end-caps follow same design philosophy  Single-sided modules on both sides of a carbon support structure Pixel barrel Pixel end-cap Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 4

ITk Strip Sensor Not reviewed, for internal circulation only  ~300 μm thick n + -in-p float zone (FZ) silicon sensors  Required to be radiation tolerant up to 1.6 × 10 15 n eq cm 2  Τ  81 Mrad  Bias voltage 100 – 500 V (depending on radiation damage) Barrel End-cap Rectangular ~97 × 97 mm 2 Trapezoidal shape ( R − ϕ coverage) Parallel strips Radial strips pitch 70 – 81 μm pitch 75 μm 2 designs (Short Strips, Long Strips) 6 designs R0-R5 Strip length 15 – 60 mm Strip length 4 rows 24 mm, 2 rows 48 mm Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 5

Hybrids, Front-End Not reviewed, for internal circulation only R0 End-cap hybrid: Curvature follows sensor geometry  Hybrids  4 layer Kapton PCB  Front-end ASICs (ABCStar)  Binary hit determination  Stores events until requested  Aggregation ASIC (HCCStar)  Communicates with up to 640 Mbits  Clock-control-readout requests are provided to all ABC  Powerboard  Converts 11 to 1.5 V for hybrids Barrel hybrid  Autonomous monitor and control chip (AMAC)  Measures temperatures, voltages, currents  Controls LV, power states, switch off HV End-cap powerboard Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 6

ITk Strip Module Not reviewed, for internal circulation only  Silicon sensor  Hybrids and powerboard glued directly on the sensor  Wire bonds for connections (25 μm aluminium)  Modules glued and wire-bonded to stave/petals 17,888 strip modules required (barrel + end-cap) Module design following mass production scheme with dedicated tools for module assembly Long Strip module Short Strip module R0 module Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 7

ITk Module Support Not reviewed, for internal circulation only  Mechanical support (low-mass carbon-fiber) End-cap loaded support structure (petal)  Staves (Barrel) and Petals (for the End-Caps)  Common electrical, optical and cooling services  Cooling via embedded Titanium tubes with evaporative CO 2 cooling (at -35°C)  Copper/kapton co-cured bus tape (power, TTC, data, detector control system)  Interface between staves and petals with the off-detector electronics through the End-Of-Substructure Card (EoS) EoS Card on an “ear” of the support structures Barrel loaded support structure (stave) Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 8

Module testing at test beams Not reviewed, for internal circulation only DUT FEI4 Mimosa-26  4.4 GeV electron beam @DESY  120 GeV Pion beam @CERN SPS  EUDET-type telescope resolution:  5-10 μ m @DESY  3-5 μ m @CERN  Track time tagging from telescope with USBPix system with FE-I4 chip.  Dry ice cooling box used for irradiated modules Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 9

Module testing. Long Strip Not reviewed, for internal circulation only  Module built using ATLAS17LS sensor and ABCStar chipset  Strip pitch 75 μm  Implant size 16 μm Define an edge of  Aluminum strip 22 μm strip/inter-strip region of 15 𝜈𝑛  Binary readout → infer charge collection in leading strip from threshold scan  Edges shown:  lower median charge → charge sharing Median Charge (fC) Full Center Edge Perpendicular to 3.65 3.72 3.37 the beam Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 10

Module Testing. Irradiated Long Strip Not reviewed, for internal circulation only  Testing of irradiated modules performance at the “end -of- life” expected fluence in the HL-LHC is a key point of the ATLAS upgrade project ITk requirements: > 99% Efficiency < 0.1% Noise-occupancy Signal-to-noise ratio > 10 Proton irradiated sensor to 𝟔. 𝟐 × 𝟐𝟏 𝟐𝟓 𝐨 𝐟𝐫 𝐝𝐧 𝟑 Τ Gamma irradiated hybrids to 𝟑𝟔 𝐍𝐬𝐛𝐞 Between ~𝟏. 𝟒𝟖 − 𝟏. 𝟔𝟔 fC Signal-to-noise ratio 15.9 Requirements are satisfied! Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 11

Module Testing. Irradiated R0 Not reviewed, for internal circulation only  Testing of irradiated modules performance at the “end -of- life” expected fluence in the HL-LHC is a key point of the ATLAS upgrade project ITk requirements: > 99% Efficiency < 0.1% Noise-occupancy Signal-to-noise ratio > 10 Proton irradiated sensor to 𝟐. 𝟔 × 𝟐𝟏 𝟐𝟔 𝐨 𝐟𝐫 𝐝𝐧 𝟑 Τ Gamma irradiated hybrids to 𝟒𝟔 𝐍𝐬𝐛𝐞 Innermost Between ~𝟏. 𝟓 − 𝟏. 𝟔𝟔 𝐠𝐃 segment in Signal-to-noise of 11.7 endcap Requirements are satisfied! Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 12

Module testing. Double-sided R0 Not reviewed, for internal circulation only  First double-sided ITk module prototype  Stereo angle allows reconstruction of space points  Expectation for resolution of ITk strip detector: 540 µm in direction “along" strips  Stereo angle α below nominal - 31 instead of 40 mrad . Only two layers at test beam 𝑞 𝜏 𝑆 = ≈ 1.1 mm 24sin 𝜚/2 # ∆𝑆 Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 13

Summary and conclusions Not reviewed, for internal circulation only  Results from sensor, readout, and module testing are well within the specification  Irradiated modules prove:  Operational requirements of efficiency and noise occupancy of the ITk strip detector are satisfied  After 15 years of designing, building prototypes, and testing we are confident the ITk Strip detector will be able to deliver the desired performance under the HL-LHC conditions  Preproduction starts this year  Plenty of production components to test  More that 20000 modules to build during production Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 14

Not reviewed, for internal circulation only

Backup Slides Not reviewed, for internal circulation only  Basic building block of ATLAS ITk Strip detector: - Staves for the barrel. Built from long and short strip modules - Petals for the endcaps  Prototyping phase based on long and short strip modules for the barrel and R0 module for the endcap Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 16

Data Reconstruction and Analysis Not reviewed, for internal circulation only  Reconstruction Test Beam - Track reconstruction by EUTelescope software using Raw data General Broken Lines algorithm Converter - DUT positions in beam not precisely known from the setup - Tracks are used to (re)align each new beam impact Noisy pixel position Clustering  Analysis Timing window: select particles in phase with 25 ns clock - Hitmaker - Time matching of hit on timing plane Pattern - Only good tracks chi2/NDF GBLAlign Recognition Aligned iterate GEAR Pattern Recognition GBLTrackFit Endcap sensors • Have in-sensor stereo angle Reconstructe implementation (“radial geometry”) d data • Custom EUTelescope modifications Arturo Rodriguez Rodriguez, INSTR20 Novosibirsk, Russia 24 - 28 February, 2020 17