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Jay Hauser, UCLA

FDWG (Forward Detector) last Weds. On muons: https://indico.cern.ch/conferenceDisplay.py?confId=243197

DESY Upgrades Week: https://indico.cern.ch/conferenceDisplay.py?confId=236161

Notes from FDWG and Planning for DESY

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A. Minimal: if endcap calorimeter geometry stays the same: Calorimeter degradation allowed at some cost to physics capabilities? Some electronics upgrades, e.g. for L1 trigger latency and rate (19 MChF!) Possibly add GE2/1, a second station of GEMs Possibly a rear muon tagger on the “collar” behind HF for |h|>2.4

coverage, improve MET Possibly replace RE1/2 for improved triggering

Additionally, if new endcap calorimeter & tracking coverage to |h|<4.0, choose between:

B. Add “ME0” station at the back of the present HE Could cover 2.4<|h|<3.5 or even 1.5<|h|<3.5 Increase of coverage: “tagging” increases muon acceptance, could reduce

MET

C. Alternate to plan B: add iron muon toroids in place of HF to cover 2.4<|h|<3.5

Large bending power, not terribly expensive Additional option to provide trigger

2(FDWG) Muon Phase 2 Options

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Timescale for decision on endcap calor. replacement: Tech Coord asked to report on rad dose of HE by

~late summer (feasibility of rework versus full replacement)

A muon back tagger on the collar brought up questions: It may deflect a lot: need to consider alignment.

Track-based may be okay for tagging with no triggering (but HLT?)

There is a lot of iron for 2.4<|h|<3.0, large multiple scattering?

Costing: invite especially electronics experts and work out better prior to DESY

Option B (some kind of ME0 within HE): Next FDWG meeting (Weds.) will be on particle flow

calorimetry – can HE and ME0 use same technology?

A few notes from FDWG

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Phase 2 physics/trigger/simulation meetings heating up Today:

https://indico.cern.ch/conferenceDisplay.py?confId=250552

Define enhancements for Phase 2 proposals (Seeking GE1/1 project approval)

Muon aging studies meetings starting Biweekly on Friday morning ~10:30 or 11, led by

Archana and Armando

Also

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Monday 17:30: muon PU and radiation aging (10’) – suggest Archana

Tuesday parallel sessions on muon 9-11:30 and 11-13:00: Good amount of time, solicit contributions in

various areas: Physics motivation and simulation Detector geometries Detector technologies Radiation aging Etc.

See 5-7 registrants from each sub-detector community

Weds. 14:40 muon plenary (50’) …next slide

Wrap-up talks Friday: supply few slides to Coordinators

Organization of talks for DESY

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Charge:o What is the longevity of the present muon

systems - issues for chambers, electronics and trigger

o Where enhancements are needed? - options for GEM / GRPC to operate at high rate / extend coverage. Cost?

o What studies are needed? What R&D?

Organize by topic and type of detector? Physics, simulation, trigger, DT, RPC, CSC,

GEM… Too many talks (7 or more) for 50’

One long talk? Too much to cover.

DESY plenary muon on Weds.

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Suggestion: four short talks 15’ Overview of Phase 2 upgrade scenarios 10’ “Baseline” upgrades necessary for L1

trigger latency, aging studies needed, etc. 10’ Physics and trigger motivations 15’ Advanced RPC technologies and GEM

technology

Speakers to be decided offline

DESY plenary muon on Weds.

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Backup

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Assuring reliability of current detector is foremost Good, not perfect: coverage of physics with |h|<2.4 Good, not perfect: triggering, ID capabilities with 4

stations Various Phase 1 enhancements are underway or planned

– not covered Plan radiation tests, rate studies – not covered in this talk

New detectors – several promising technologies Increased rate capability, excellent timing, reasonable

cost, … Discussions initiated by muon community are naturally

focused on particular technologies However, each can be used in different ways within

different geometries – n*m choices leads to too many options

Leads to organizing principle: focus on the geometry and physics first, match the technology to the geometrical application later

Perspective on Phase 2 muon upgrades

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Replace electronics as necessary, for increases in L1 trigger latency and event accept rate

CSC new front end for latency > 6 ms, DT electronics if rate>300 kHz Cost ~14+5 MChF, respectively

L1 trigger could still make some additions to improve rate or efficiency

GE2/1 was originally proposed, covers 1.65 < |h| < 2.4 RE1/2 could be replaced with finer-grained detector for trigger, not yet

proposed

Muon tagger behind YE4 to cover |h| >2.4, improve MET Several geometry choices

10Muon Option A:

Minimal changes if endcap calorimeter geometry fixed

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In this view it looks possible for 2.4<|h|<3.0, but…

Muon tagger?

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In the more detailed drawing it looks difficult, but…

Muon tagger: detailed view of HF region

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Behind HF, can go from h 2.4 to well beyond 3.5

Collar and shielding need replacement anyway for Phase 2 LHC

Can install one station for tagging, or several with shielding between them

Mounted behind HF

h=2.4

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In scenario where Tracker and endcap calorimeter coverage increased to |h|<4.0

You are the experts on this…

Extend muon coverage to 2.4 < |h| < 3.5 or so Just behind HE (depends on HE thickness in interaction

lengths), or Make HE a “tracking calorimeter“ where the tail of had

shower = muon detector?

Rates are high, but don’t necessarily trigger Have a high-momentum central track: is there a muon

tag nearby?

14Muon Option B:

New EE/HE, extend muon coverage to |h|<3.5

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“ME0” At back of present HE

Totally new calorimeter Existing structure too

“hot” Coverage options:

Minimal (top), maximal (bottom) shown on right

{1.5, 2.4} < |h| < 3.5 Complement or replace

ME1/1 “Integrated” option

Build all of HE with GEM technology, for example

Muon detectors in new endcap

NewHE

mME0

mME0

Additional EE/HE coverage

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If endcap coverage extended to |h|<4

HF likely to be replaced?

Something needs to stop and/or measure hadrons with |h|>4 Little HF? HF moved closer inside

cone?

Muon detectors behind YE3

m tagger

Jets, underlying events

h=2.4

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Similar size, weight as HF, cover 2.4<|h|<3.5 ? Very good bending, but limited resolution due to multiple scattering Innermost part, still need shielding of muon detectors Could be used for triggering if justified by physics

17Muon Option C:New EE/HE, add iron muon toroids in place of HF

New HF,shieldingNew endcap

Detectors, iron core toroids

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Coverage |h| 2.39-4.0 Magnetic field: 1.72-

2.17 T depending on radius

Path length: 3 disks x 0.78 m

Bending 4.0-5.1 Tm! Momentum resolution

~14% up to ~TeV

Steel costs 7.6 MChF each end 382 tons

Other (copper, support, cooling) costs perhaps 0.9 MChF

Electricity 270 kW, annual cost ~140 kChF

More on iron core toroidsSlava Klyukhin

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In any case, will do electronics upgrades to accommodate L1 trigger changes, etc.

Could be expensive and painful

Option A, current endcap geometry, need to investigate sub-options:

A1: build GE2/1 - try to maintain acceptable trigger in difficult region of 1.8<|h|<2.5 where Track Trigger may be inefficient

A2: build Muon “back tagger” behind HF: physics enhancement of |h|>2.4 A3: install a RE1/2 replacement to improve trigger for 1.2<|h|<1.6

Endcap calorimeter replacement? Decision when? you tell us… Option B: ME0 detectors at the back of the present HE for coverage, MET,

L1 trigger? Option C: Muon toroid detectors at present position of HF likewise

Next steps: How to develop the physics and trigger cases, simulation strategy

(Alexei’s talk) Develop detector technology choices and cost estimates (Archana’s talk)

19Summary

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Additional trigger rate reduction arguments (e.g. GE2/1)

Details on new HE calorimeters: creating space for muon detectors, etc.

“ME0” within HE: integrated detector technology? Shielding requirements Toroids: magnetic forces on them & YE3 Uses of high-h muons

In tagging mode to increase acceptance, reduce sources of MET

Provide trigger

21Possible discussion topics