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Advanced Features of the ALICE Silicon Pixel Detector: Overview and Milestones

The ALICE Silicon Pixel Detector comprises a 13.5 mm x 15.8 mm five-layer bus and extender, with a total surface area of approximately 0.24 m² and power consumption around 1.5 kW. Utilizing C4F10 for evaporative cooling at room temperature, the detector achieves a material budget of roughly 1% X0 per layer. Equipped with unique L0 trigger capabilities and user-defined algorithms, the detector features 8192 cells and 1200 wire bonds across 80 half-staves. Since installation in 2007, it has successfully detected cosmic events and has played a critical role in data acquisition during LHC operations.

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Advanced Features of the ALICE Silicon Pixel Detector: Overview and Milestones

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  1. Highlights of the ALICE Silicon Pixel Detector 13.5 mm 15.8 mm 5 Al layer bus + extender • 2 layer barrel • Total surface: ~0.24m2 • Power consumption ~1.5kW • Evaporative cooling C4F10 • Room temperature • Material budget per layer ~1% X0 MCM + extender + 3 fiber link Ladder 1 Ladder 2 MCM Grounding foil Half-stave Outer surface: 80 half-staves • ALICELHCb1 • readout chip • mixed signals • 8192 cells • 50x425mm2 ~1200 wire-bonds • Unique L0 trigger capability • Prompt FastOR signal in each chip • Extract and synchronize 1200 FastOR signals from the 120 half-staves • User defined programmable algorithms Inner surface: 40 half-staves

  2. SPD installed in ALICE in Jun‘07 Final checks (top-right), installation around the Be beam pipe (bottom-left) and last sight (bottom-right)

  3. Commissioning started-up in Dec ’07 • First cosmic event detected in the SPD on 21 Feb ’08 • SPD prompt trigger (≈800 ns latency) to ALICE L0 installed and commissioned in Apr ‘08 • Data taking for the inner alignment of the ITS modules and ITS vs TPC from May ’08, trigger provided by the SPD • SPD residual misalignment < 10 mm (detector position resolution 12 mm) Side view View along z Side view View along z SPD Online Event Display - Cosmic Run Self-triggered (FastOr) coincidence of top outer and bottom outer layer

  4. First sign of life in LHC seen by the ALICE SPD on 15 Jun ‘08 during a transfer line injection test - cover and LHC focus article in the Jul/Aug issue of the CERN Courier • SPD operational during the beam injection tests since Aug ‘08 in self-triggering mode - study of the LHC screen related background in ALICE • On 10 Sep ‘08 the SPD lights up with first beam in LHC Longitudinal tracks along up two ladders (14 cm)

  5. SPD ready to record the first collisions in LHC in Sep ’09. • «It's 9 a.m. and the Silicon Pixel Detector in ALICE • lights up with particle “debris“ created as beam in • the transfer line from the SPS hits the beam stop • before Point 2.» • From CERN Courier –Nov. ’08 – LHC focus: “LHC first beam: a day to remember” • First beam-induced interaction in LHC recorded by the ALICE Inner tracking System on 11 Sep ’08 - Beam 1 captured by RFs and circulating up to 30’ - SPD triggering - ITS standalone tracking, 7 track event

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