12.04.2011T. Kawamoto1 Small Wheel upgrade project Muon week, upgrade meeting 12.04.2011 T. Kawamoto.

12.04.2011 T. Kawamoto 1

Small Wheel upgrade project

Muon week, upgrade meeting12.04.2011

T. Kawamoto

12.04.2011 T. Kawamoto 2

Tentative and incomplete lists of requirements on the new small wheeland

introduction to next steps

Based on what we have studied and learned

• Reference cavern background rate• Requirements for L1 functions and electronics• Requirements for precision tracking• Requirements as a detector system

• Way to proceed• Schedule• Milestones

12.04.2011 T. Kawamoto 3

Cavern background and detector signal rate

Estimated cavern bkg

The RBTF numbersused with safety factor 5reflecting its uncertainty

In the lights of new simulation and measurements with collision data,can we update the estimation and its uncertainty/safety factor ? new reference table ?

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RBTF and prelim. FLUGG(C. Young)

more detailed comparisonsin his Oxford slides

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C. Young, at OxfordR = MDT data / FLUGG simulation

• General good agreement, R=0.7 – 1.5, except for small corner with R= 2.5 - 3.0• In small wheel, R = 1.5 – 2.0 (data is high)

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1.0x1034

2.5x1034

5.0x1034

Expected MDT tube rate (kHz/tube) from simulation (my simple calc ) with a (radically small ?) safety factor = 3

based on FLUGG simulation

Tub

e ra

te (

kHz)

EIEM

EOBarrel

R

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Requirements on L1 function and electronics

From the studies of Domae, Nagano (resolution) and Suzuki (fake removal),

we now know that we ask NSW to

• Find segments with high efficiency and low fake• resolution of 1 mrad

Tubes Strips (MM, TGC, RPC) Wires (TGC)

15 mm tube:drift time 200nsperhaps OK for the L1 latency

~ 30 cm max, maybe ~ 40 cm?need resolution < 0.6 mm/layer < 1~2 mm pitch

Help with pads ?(good for all the 3)

12.04.2011 8T. Kawamoto

L1 latency

12.04.2011 9T. Kawamoto

BW TGC data arrives at SL 1088ns after collision.

This margin is shared bymuon upgrade, topo trig,CTP, MuCTPi upgrades

L1 latency

12.04.2011 10T. Kawamoto

data from NSW

newSL

Data from NSW should arrive at new SL earlier than those from BW TGC things are easy.

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Requirements on precision tracking

• Not much studied yet, except for efficiency drop of MDT at high rate

• What are needed at high lumi to maintain the tracking performance ?• Can we aim even improving the performance (if there is any room) ?

• more layers• faster detector

• Reconstruction experts contacted. Foresee reports in next meetings.

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Requirements as a detector system

• Mechanics• Large-Small layout• Ensure access to detector, electronics and services

• Similar or better radiation shielding

• 100% detector coverage

• Careful about services• size of cables, tubes• cooling needed ?

• Alignment

• Installation strategy, ALARA• Cost

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Basic structure : with JD or without ?

• JD is not needed as magnetic return for solenoid• without JD, the whole structure may be light-weight : easy to handle• without JD, access to detector will be easier

However

• JD is (believed to be) needed for mag-shielding for LAr, Tile electronics

and

• JD does radiation shielding (simulation study)

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Next steps

• Establish the requirements • Participation needed (background reference, L1, tracking, system)• More structured/organized activities : working group

• Tools for performance study: perhaps no single super tool• High lumi MC with the present detector (still need validation)• Overlay of real data to emulate high lumi condition (good for some• Simulation of new detector anyway (technical difficulty ….

• Next meetings• 28 April (Thursday)• 13 May (Friday)• 30 May (Monday)• 17 June (Friday)• 5 July (Tuesday, Muon week)• 22 July (Friday)

• TP editorial meetings

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RequirementsRequirements

Layout 1Layout 1

Layout 2Layout 2

Layout 3Layout 3

Expected performance

Expected performance Baseline layoutBaseline layout

Layout ……Layout ……

Evolution

Autumn 2011

a panel of external

members

a panel of external

members

with

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LHC and shutdown schedule

Shutdown for phase -1 : end of 2011, EEL, EES C-side, trigger feet region

Shutdown for phase 0 : 2013, 2014(a part of), 19 months for LHC, 2 years p - p

Shutdown for phase 1 : 2017 possibility of 2018 being discussed

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• Requirements on tracking, L1, technical feasibility, cost, …. : in next few months

• Technical proposal : draft by end July for circulation in the muon collaboration

• Requirements• with several detector/electronics options

Finalise Sept/Oct 2011 proceed to the project

• Detector technology choice, baseline layout : by autumn 2011

Suggested schedule : for discussion here and also at the muon week

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Last autumn, when IB set up the internal project of new small wheel,

phase-1 shutdown was 2016.

Many considered that 2016 was very tight (and I agree).2017 may be just OK.2018 would be better.

No margin for slowing down the schedule.