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GIF++: more coordination of planning needed Among CMS muon systems (shadowing?), in CMS, and

LHC-wide CF4 as a greenhouse gas (GWP = 7390, lifetime

50000 yrs) GEMs: define baseline without CF4 (poorer timing) CSC: investigate R&D for eliminating CF4 (CF3I??)

CSCs and L1 trigger latency Tracker front-end hits an important boundary at 12.5 us CSC simulations at 10, 20 us: should repeat at 12.5 us;

then verify; can we live with these results (versus huge replacement program)?

RE3/1, RE4/1: bakelite RPC only need minor improvements Improvement factors only ~ 2 to 4 required No justification for ~100 ps timing given Tracker points

to vertex Need to check that RPC Splitter links (GOL) are

compatible with upgraded L1 Forward Muon Track Finder

Muon news from Upgrades Week - I

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ME-0

ME-1/1

Muon simulation First plot showing ME0 background

rates (well, fluxes) Expected hit rates ~100 kHz/cm2

(10-3 of rate capability) More attention needed for

neutron, photon, charged background rates In order to understand existing

detectors In order to build confidence in

simulation for ME0 particularly Comparisons of data (CSC, RPC,

DT) hit rates to each other Compare data hit rates to FLUKA

and GEANT

Muon news from Upgrades Week - II

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Importance of new muon detectors for L1 trigger not well understood with functional Track Trigger L1 momentum supplied by Tracker Muon system used primarily for

pointing to the Tracker

What needs to be understood: Rate limits for muon-only tracks to

matching? Muon system matching accuracy

needed? How good is TT efficiency at high

eta? Is high-eta TT simulation now stable? Difference between Associative

Memory (AM) versus FPGA designs for TT?

Muon news from Upgrades Week - III

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Challenge from spokesperson on physics of muon upgrade See following slide – need workshop <June but when? Involve Upgrade Performance Studies group, muon

POG, muon DPG, and simulation teams

Muon news from Upgrades Week - IV

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Some considerations from this week: muons

• We need to beef up the physics case• In the near future we will need to have a clear

view of how to reconcile the apparently parallel threads on the choices/options for muon upgrade description in the TP for Phase 2 and the GE1/1 ‘project’ that will reach “TDR level” by the fall

• We should probably plan for a dedicated workshop on this

April 2, 2014 CMS Upgrade week , T. Camporesi 5

From CB meeting: Tiziano

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1. Phase 2 TP: next update for reader group Contact group meets Thursdays, next release planned

April 172. Costing: new estimate needed for Management

by April 31 Fabrizio will discuss about that next

3. Dedicated meeting on measured & Phase 2 background rates Week of April 22-25 after AGR? Summarize at GMM of April 28?

4. Workshop on “Physics of the Phase 2 muon upgrade” Hold it before June to motivate the upgrades included in

TP Possibly 2-3 days Seems that April is too soon, look for dates after Fermilab

workshop on upgrade physics, e.g. 12th-14th , starting afternoon of the 12th

Future Meetings

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Backup

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1. Consolidation of existing detectors DT, CSC, RPC To handle 6x more integrated and 5x more

instantaneous luminosity than design To last ~30 years To reduce or eliminate greenhouse gas emissions

2. Completion of the forward region 1.6<h<2.4 Redundancy as originally foreseen 1997 in the muon

TDR Improved high luminosity triggering (lowered

thresholds) New technologies that handle the high rates and

complements the CSC, i.e. thin & simple GEM and iRPC3. Muon tagging for h>2.4

One GEM station within a rebuilt endcap calorimeter Up to as high as 4.0 depending on the calorimetry

Areas of Phase 2 muon interest

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Consolidation – GIF++ muon planning

RPCs High eta

RPCs consolidationRPC gas studies

CSC

GEM

DT

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NB need additional infrastructure, need for CMS & CERN–wide coordination

Numerous chambers into GIF++ (ME1/1, ME1/2) starting late 2014/early 2015, ~8 months irradiation

Hands-on (–off!) opportunity for young scientists

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GWPs - Global Warming Potentials http://en.wikipedia.org/wiki/List_of_refrigerants SF6 is 23900; C2H2F4 is 1100, CF4 is 6500, other fluorocarbons typically ~5000-10000 Fluorocarbons to be ruled out in the EU after 2017

RPC gases Chambers are leaky (500 l/hr), and gas mix C2H2F4 + isoC4H10 + SF6 95/4/0.3% Fluorocarbons have been essential to good operation of RPCs – so a big problem

CF4 for GEMs and CSCs: GEMs typically 30% CF4 for optimal timing, but not essential when in conjunction with

CSC CSC contains ~4% of CF4 for anti-aging, little leakage, closed loop gas system and

recuperation (but not 100%)

Consolidation – gas mixtures

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CERN can get EU derogation as a scientific institution, but will substantially reduce global warming components. What about gas availability >2017? For GEMs we will define the baseline without

use of CF4 Open question: do we need an anti-aging gas

R&D for CSC? Not anticipated

5→8 ns

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“Old” CSC cathode front-end boards (CFEB) include switched capacitor arrays with 96 cells x 50 ns. These precious cells are used: Before a “pretrigger” based on

pattern of hits in the 6-layer chambers

After each pretrigger but before L1A, store 8 cells (follow fairly slow front-end signal for low noise / high precision)

Curves on right are simulation of the CSC cathode data loss versus L1A latency and rate. Data loss >2% for >10 msec

Cost and effort to replace CFEBs is enormous: 13.8 MChF and *12* months (AL) full-time use of the crane

Consolidation – L1 trigger latency

10 msec

1 MHz

• Noted this week that Tracker FE limit is 12.5 msec: will Track Trigger electronics (FPGA or AM solutions) push us as high as that value? Hope not…

• What is CSC situation at that latency? Is the data loss random, or not?

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GEM detectors (proposed for GE1/1, GE2/1, and ME0 Chambers: well-advanced in context of GE1/1 Front-end electronics: VFAT3 needed for CMS

and under design Back-end, DAQ, and trigger electronics R&D:

under development for 40o GE1/1 slice test installed in YETS 2016

Slice test is a natural focus for 2014-2016 R&D Building 904 combined CSC-GE1/1 test stand

is a natural place for tests

New muon detector R&D

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GE1/1 slice testYETS 2016

VFAT3

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Need iRPC (Improved RPC) detectors

Modest 2-4 rate capability improvement factor is sufficient, easily within reach Using low-noise ATLAS-developed

electronics Using low-resistivity selection of

existing bakelite panels Straightforward build of RE3/1,

RE4/1 now seems acceptable No clear physics motivation yet

for ~100 ps resolution Glass RPC multigap Link to tracks that point at correct

vertex Would need R&D for fast CMS

electronics Need to check links compatible

with CSC Track Finder upgrade

New muon detectors: RE3/1 and RE4/1

New RPC electronics

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New detectors now implemented Reconstruction software

development beginning Physics gains being quantified More attention needed for

neutron and other background rates: Comparisons of data (CSC, RPC, DT)

hit rates versus FLUKA and GEANT L1 trigger situation well

understood for GE1/1 addition to CSC

Trigger less well understood for Phase 2 era with the Track Trigger functional E.g. how good is high-eta efficiency? Is high-eta TT simulation stable? Muon system pointing accuracy

needed?

Muon simulation for Phase 2 upgrade

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ME-0

ME-1/1