Upgrade of the ALICE ITS

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Transcription de la présentation:

Upgrade of the ALICE ITS Motivation, options, strategy, manpower, funds 1

Physics motivation for the ITS upgrade Two main topics: thermalization and hadronization of heavy quarks in the medium baryon-to-meson ratio, i.e. Lc/D, Lb/B azimuthal anisotropy v2 possible thermal charm production? in-medium energy loss separately for D and B mesons wide pT range, and especially low pT Significant differences between c and b predicted Three benchmark analyses have been investigated in detail in the CDR: charm meson production D0 → K-p+ beauty meson production B → D0 (→ K-p+) + X charm baryon production Lc → pK-p+ I. Belikov 2

The two ITS upgrade options Option A: 7 layers of monolithic pixel detectors: better standalone tracking efficiency and pT resolution worse PID Option B: 3 inner layers of pixel detectors and 4 outer layers of strip detectors: worse standalone tracking efficiency and momentum resolution better PID The choice A-B to be made in 2013 Option B 4 layers of strips Option A 7 layers of pixels 3 layers of pixels Pixels: O (20x30µm2) 700 krad/ 1013 neq Includes safety factor ~ 4 Pixels: O (20x20µm2 – 50x50µm2) Strips: 95 µm x 2 cm, double sided 3

General strategy Main stream : MISTRAL - end of column discriminators (2 / col.) ⇛ 30 μs read-out time - fixed parametres of sparsification and memorisation circuitry Side stream : ASTRAL - optimisation path: staggered diodes, in-pixel & sparsification circuitry optimisation, ... - acceleration path: in-pixel discriminator (AROM) architecture devt ⇛ 15 μs read-out time Main chip components addressed by R&D: Charge sensing node (CS) In-pixel ampli+clamping (AC), Discriminator (DI), Zero-suppression circuitry (ZS), Output buffers (OB), Transfer circuitry (DT), Steering circuitry (SC) R&D strategy Parallel development of upstream and downstream parts of chain until ready to combine -> FSBB chip upstream part (MIMOSA-22 and AROM chips) : CS + AC + DI + SC (part) downstream part (SUZE chips = sparsification circuitry) : ZS + OB + DT + SC (part) MIMOSA/AROM + SUZE -> MISTRAL/ASTRAL = 3×FSBB

Plans 2012 main goals 2013 main goals 2014 main goals 2015 main goals - test (November): MIMOSA-32ter. Exploration of in-pixel ampli. submit (December): MIMOSA-22THRa. Main stream CS + AC + DI + SC (part) exploring in-pixel ampli → ֒ 128 col. of 320 pixels (8-9 diff. amplifiers) MIMOSA-22THRb. Main stream CS + AC + DI + SC (part) exploring 2-row r.o. with 2 discri/col → ֒ 64 col. of 128 pixels (2-4 diff. amplifiers) SUZE-02. Main stream ZS + OB + DT + SC (part) based on 2 groups of 32 columns of 64 pixels 2013 main goals validate upstream part of mainstream sensor (MISTRAL) and find optimised design validate downstream part of MISTRAL submit 1st version of full chain prototype (FSBB-M) - submit and characterise 1st prototype of upstream part of ASTRAL (sidestream sensor) 2014 main goals - characterise FSBB-M - submit MISTRAL-0 prototype - validate AROM architecture 2015 main goals - validate AROM-2 design - characterise MISTRAL-0

Synthèse de la phase de design, soumissions et tests des chips D: design S: soumission F: fabrication t: préparation des tests T: réalisation des tests Nombre de soumissions de chips

Budget pour la fabrication des chips (prototypes R&D et préproduction) * Each FSBB submission may cost an additional 50-70 kE overhead in order to use stitching rules

For the production, ~1 M Eur is requested from IN2P3

More than 20 international institutions

Ressources humaines nécessaires pour la phase de R&D Ingénieurs du groupe PICSEL ETP pour le design des chips ETP pour la préparation et la réalisation des tests Total ETP + physiciens: groupe PICSEL: 2 ETP, groupe ALICE: 1 ETP

Préparation de la production, production, installation et commissioning 2012 2013 2014 2015 2016 2017 2018 R&D Production Installation & Commissioning Préparation de la production Test des chips 2 ETP 1 ETP 1.5 ETP 2 ETP 1 ETP 1.5 ETP Assemblage 4 ETP 1 ETP 2 ETP 4 ETP (1) 0.5 ETP 1.5 ETP 4 ETP (2) 0.5 ETP 1.5 ETP Préparation de la production - Elaboration des procédures de test des chips (sur wafers) - Fabrication des cartes de test (probe station) des chips Outils de manipulation des chips Elaboration des procédures d’assemblage des chips sur échelles et études pour l’industrialisation de l’assemblage Groupe de m-technique Groupe de Mécanique Groupe PICSEL Groupe ALICE Production Test des chips sur wafers Option 1 (7 couches de MAPS = 70000 chips avec hypothèse d’un rendement de 50%): test de 15% des chips au max. ~10000 chips Option 2 (3 couches internes de MAPS + 4 couches de mStrip): test de la totalité des chips ~1000 chips Assemblage des chips sur échelle (connectique) A rediscuter en fonction de la technologie de connectique retenue (Wire, TAB, Bump, Slid ) et du scénario d’assemblage (en labo ou industriel) En 2015, 4 ETP essentiellement pour les tests de chips En 2016, partage entre test de chips et assemblage en fonction du scénario retenu (voir slide suivant)

L’implication du groupe ALICE dans le projet Se situe actuellement à 3 niveaux: 1) Développement du nouveau tracking d’ALICE intégrant les caractéristiques du nouvel ITS et des capteurs monolithiques (1 ETP) 2) Tests sous faisceau et en laboratoire des prototypes (R&D) Etude de la réponse des capteurs et leur intégration dans la simulation globale d’ALICE (1 ETP) 3) Simulations pour l’optimisation de la reconstruction des baryons charmés (0.5 ETP) A partir de 2014: Phase de préparation et réalisation de la production (1.5 ETP)

Summary PICSEL mTech ALICE 11 1 14 2 13 4 3.5 12 8 2.5 Total 16 20.5 ETP (IPHC) 2012 2013 2014 2015 2016 2017 2018 PICSEL mTech ALICE 11 1 14 2 13 4 3.5 12 8 2.5 Total 16 20.5 19.5 12.5 5.5 Demands (IN2P3, R&D, kEur) 125 345 300 380 + ~1 MEur for the production ------------------------------------------- ~ 2 MEur