ATLAS Upgrade Plans ATLAS Hardware – Challenges and Opportunities Norwegian CERN “Town Meeting” Bergen

ATLAS Hardware Overview Boundary Conditions: LHC Running, Upgrades “Phase-1”: Inserted B-Layer “Phase-2”: Next Inner Detector Norwegian ATLAS Hardware: – Recent (2007 – present): 3D Pixel Sensors R&D – Current (thru 2014): IBL Design, Construction – Future (2015 – 2021): New ID Bergen Town Meeting2

Coupling to the LHC Schedule Assumed identities: – “Phase-1” == IBL – “Phase-2” == New ID Rad. damage & Physics rate Chamonix 2010: – Roadmap to 7+7 TeV – Roadmap to 1000fb-1 – Linac4, PSB, PS2, IR… Not so obvious anymore… Bergen Town Meeting3 S. Myers, LHCC,

Current ATLAS Policy (?) New Pixel layer to be constructed, installation ASAP (2014) New Inner Detector needed for the 2 nd decennium of the ATLAS program Bergen Town Meeting4

IBL: Motivation and Concept Original forecast: – The innermost Pixel layer (B-Layer) expected to burn out and need replacement after a few years of running Study group ( ) findings: – BL replacement difficult and hazardous – Unclear timescale of rad. damages – Smaller diameter beam-pipe is feasible 4 th Pixel barrel: The Inserted B-Layer (IBL) – Insurance against catastrophic BL failure – Improved physics performance Bergen Town Meeting5

IBL: Requirements Improve B-tagging performance: – About 50% of existing BL material (X/X0≈1.5%) Active parts must fit inside existing BL: – = 32 mm – L(Z) = 640 mm Services must fit within existing ID/routing Safe, fast, and feasible extraction and installation Operate as integral part of Pixels Bergen Town Meeting6

IBL: Design and Technology Sensors: – Planar n-type thinned, slim-edge (avalanche?) – 3D DRIE etched vertical columns – CVD Diamond Front-end FE-I4: – 50 x 250 um**2 pixels – 16 x 20 mm**2 active area – 160 Mbps data link Local support: – Carbon foam, Skinned stave – Titanium cooling pipes (Carbon fiber for fall-forward) – CO2 evaporative cooling (C3F8 for fallback) Bergen Town Meeting7

IBL: Project status Project organization (PL, TC, WGs) in place Baseline design, technology: almost defined Draft-TDR being circulating with select reviewers Interim-MoU under discussion Budget: 9-10 MCHF (MoU A/B + “fresh money”) Current Schedule: – Sensor type decision early-mid 2011 – Production 2011 thru 2013 – Install in 2014 Bergen Town Meeting8

ID Upgrade: Concept Replace entire Inner Detector – Handle 10 – 20 x peak luminosity Granularity vs Occupancy matching – Short, longer pixels – Short strips – Long strips Low-level track trigger – “Low” B-field drawback wrt CMS – Detector provides track stubs – Match to Muon-system – Match IP z-position – Level-0.5 and Level-1.5 schemes Letter of Intent – Funding agencies to make commitments from 2015 – Design and construction for installation in the early twenties Bergen Town Meeting9

ID Upgrade: Technology Completely (?) Solid State – Match sensor (CVD, 3D, Planar) to radiation damage – Gaseous Pixels (Gossip) - somewhat unlikely ? Advanced powering schemes: – Minimize dead volume and X/X0 – Serial powering – DC/DC converters Data bandwidth vs power dissipation Local intelligence (ZS, triggers) Bergen Town Meeting10

Norwegian IBL contribution Norwegian share of CORE: – 73 kCHF (unconditional) – Up to 300 kCHF total (if 3D sensors) – Alternative “project” in case non-3D? Already spending 100 kCHF – SINTEF 3D sensor prototype – CORE weight < 0.5 – Considerable risk one run not enough Personnel: – 2 – 3 Faculty (part time) – 1 – 2 Post.doc (full time) – 1 – 2 Ph.D (part or full time) – 1 – 2 FTE Engineering support Bergen Town Meeting11

Norwegian ID Upgrade Contribution ATLAS ID Upgrade: 250 MCHF CORE Need to define during next funding period – 0.88% of ATLAS authors – 3% of current ID Aim for 2.5 MCHF to 5.0 MCHF CORE – E.g. fraction of 3D sensors (if SINTEF) – Build, integrate and commission modules (ref SCT) Personnel: – Retain IBL group – Add e.g. advanced tracking – Possibly physics studies Bergen Town Meeting12

Conclusions IBL contribution defined; small but focused: – Non-overlap with our funding period – Somewhat over-subscribed in terms of interest – Complex sociology of “old” and “new” groups ID Upgrade contribution – Need to define during 2012 – 2015 – Expect to start construction 2015 A credible Norwegian ATLAS HW program – Continuous personnel efforts (2 – 3 Ph.D/Post.doc) – Local infrastructure upgrades – Substantial CORE investments from 2015 (somewhat difficult as in middle of next funding period) Bergen Town Meeting13