Pixel sensor for ALICE ITS upgrade & CIS

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Pixel sensor for ALICE ITS upgrade & CIS

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Pixel sensor for ALICE ITS upgrade & CIS Y. Kwon (Yonsei Univ.)

NA LHC SPS ALICE

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

ALICE (Participation)

A possibility in Korea

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

Typical PIN-type Si sensor

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

Traditional Si sensor operation -

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

Processed Wafer

New challenge

Current ALICE ITS

ALICE ITS Upgrade

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

Sensor + Digitization

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?