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Pixel sensor for ALICE ITS upgrade & CIS

This document outlines the proposed upgrade of the ALICE Inner Tracking System (ITS) at the LHC, emphasizing the integration of advanced pixel sensors. The upgrade will enhance performance measurements, specifically in charm and beauty spectroscopy under varying collision centralities. With a focus on the use of silicon sensors for improved energy and time resolution, the paper discusses the challenges of cost, fabrication, and the integration of CMOS processes. The ITS upgrade has been approved and represents a top priority for enhancing particle collision data collection.

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Pixel sensor for ALICE ITS upgrade & CIS

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  1. Pixelsensor for ALICE ITS upgrade & CIS Y. Kwon (Yonsei Univ.)

  2. NA LHC SPS ALICE

  3. ALICE Set-up Size: 16 x 26 meters Weight: 10,000 tons TOF TRD HMPID ITS PMD Muon Arm PHOS TPC

  4. ALICE(Participation)

  5. A possibility in Korea

  6. Si sensor in general • Mature technology • Reliable performance • Fine granule • Higher energy and time resolution (than gaseous ionization detectors) • Key burden is cost.

  7. Typical PIN-type Si sensor

  8. R&D environment 6 inch fabrication line 300 cm2 ~ $ 500 8 inch fabrication line

  9. Traditional Si sensor operation -

  10. How do we make it? (CMOS process) Metal layer deposition High purity Si wafer Oxidation Passivation Oxide layer deposition Etch for contact Ion implant

  11. ProcessedWafer

  12. New challenge

  13. Current ALICE ITS

  14. ALICE ITS Upgrade

  15. Main Physics Goal • As a function of collision centrality, measure • Charm spectra down to pT=0 • Beauty • Displaced J/ production • Displaced D0 K • Heavy flavor from single displaced electrons • Thermal radiation

  16. Sensor + Digitization

  17. As of now • Would it work? • In physics?... ITS upgrade is approved and is also top priority. • Technically?... Probably, R&D might be initiated. • Financially? • Politically?

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