Detector studies, Radiation Simulations, Organization

FCC Hadron Detector MeetingJuly 27th 2015

W. Riegler

FCC Week 2016

Rome, 11 – 15 Apri l 2016

• Document on physics at 100TeV. Including detailed characterization of benchmark channels.

• Detailed radiation simulations detector technology discussion

• Detailed tracker studies

• Baseline magnet system(s)

• Detailed calorimeter studies

• …

Goals for April 2016 FCC Week

Magnet Systems

Magnet Systems

Is a “Standalone Muon System” needed ?

Very early LHC detector concepts were based on muon systems only.

When trackers were included it was still far from clear whether a tracker close to the IP could survive the high rates and radiation load.

The standalone muon system of ATLAS should guarantie that one is on the safe side if trackers ‘would go up in flames on first collisions’. CMS does very much rely on the tracker for the muon performance.

Magnet Systems

For an FCC hadron detector by 2035, with tracker loads ‘only’ higher by a factor 2-10 with respect to HL-LHC there is no doubt that a tracker can be built that will perform well.

We do not see the need for a ‘standalone muon concept’ for an FCC-hh detector. The muon performance can fully rely on the tracker.

The ‘CMS like’ detectors with twin solenoid or partially shielded solenoid, together with forward dipoles, should therefore be defined as a baseline magnet system.

Coordinate System

!! Coordinate Systems !!

Yph

Xph

Zph

For the LHC detectors, a coordinate system is used where X points towards the inside of the Ring

(0,0,0) nominal IPXph … horizontal towards center of the ringYph … perpendicular to Xph and Yph ‘up’Zph … along the beamline, righthanded system

This system is different from the one used for beam optics studies as well as FUKA simulations, and in addition it is considered ‘unnatural’.

We therefore adopt a different coordinate system for the FCC:

FCC Detector Coordinate System:(0,0,0) nominal IPXph … horizontal towards the outside of the ringYph … perpendicular to Xph and Yph ‘up’Zph … clockwise along the beamline, righthanded system

Center of the FCC ring

B Field Map

Magnetic Field

H. Ten Kate, Matthias Mentink et al. et al.Provided a Field Map [x,0,14],[y,-14,14],[z,0,24]mon a Cartesian grid of 0.25m

Yph

Xph

Zph

Magnetic Field

Yph

Xph

Zph

Bz

By

Magnetic Field

Eta = 2.5

Eta = 2.5

Magnetic Field

Using this field map we can do semi-analytic studies on detector layout and performance needs in order to arrive at the nominal performance formulated in the DELPHES card.

Geometry for Radiation Calculations

Past:Very simple estimates for tracker given (W. Riegler)First studies with detailed detector geometry and simplified B-field (C. Young et al.)

Next:Detailed detector and magnet geometry with correct B-field.Simulations by Fluka team starting (M. I. Besana, F. Cerutti et al.)

Beampipe

Central pipe: Cylinder Beryllium Rin =2cm, Rout=2.1cmFrom z=0 to z=800cm

Forward beampipe:Beryllium 1mm wall thickness Projective cone (inner envelope) along 2.5mRad opening angleFrom z=800cm to z=32000cm

Beampipe Connecting to TAS:From z=3200 to 3230cm – cone to go from R=8cm to R=1cm-2cm (matching TAS), AluminumBetween 3230cm and TAS – keep cylindrical beampipe, AluminumCylindrical shield around this beampipe will be necessary

Beampipe

6.7

6.

5.5

5.

6.5

4.54

Coils

Coils: Pure Aluminum

Z=1010cm, R=625cm

Z=1010cm, R=782.5cm

Z=760cm, R=1300cm

Z=760cm, R=1347.5cm

Next Page

R=0.182848*Z+41.39

R=0.182848*Z-15.61

Z=1480

Z=2098

X=0.182848*Z+339.39

Rotation around z axis

Parallelogram with a given thickness in Y direction

Coils: Pure Aluminum

Sandwich total 110cm:10cm Aluminum at 300K62cm Calomix at 87K38cm Aluminum at 300K

Calomix in Volume (%):LArg 64.8%, Pb 21.7%, Cu 7.2%, Polystyrene 6.3%X0 of this mix: 2.06cm

It will be interesting to change this to W, Cu etc. and see the effect on neutrons and background …

ECAL, Liquid Argon

Eta 2.5=9.39 degrees

Z=2400cm to z=2510m

Homegenous material 240cmRin = 360cm, Rout = 600cm

Material composition in Volume (%):80% Fe, 20% Polystyreneλ of this mix = 20.5cm

HCAL

Eta 2.5=9.39 degrees

Z=2510cm to z=2750m

Fill entire Volume between coils with Aluminum

Since we aim for an air core muon system we assume 1X0 of material in the 3.6m of space. Since Radiation length of Al is 9cm the Al density has to be scale down by a factor 40.

Eta 2.5=9.39 degrees

Muon

Z=2750cm to z=3150cm

Material composition in Volume (%):Si 20%, C 42%, Cu 2%, Al 6%, Plastic 30%X0 of this mix: 14.37cmWe assume 3% of radiation length per layer, i.e. each layer has a thickness of 0.43cm.

Tracker

Eta 2.5=9.39 degrees

Z0=0 Z3=800cm

y2=240cm

Z1=100cm Z2=300cm

Y1=60cm

y0=2.2cmIB ID

OB OD

Inner Barrel (IB) 8+1Inner Disk (ID) 8Outer Barrel (OB) 8Outer Disk (OD) 10

Tracker

Inner Barrel: half length (cm) , radius (cm)

Inner Disks: z (cm), inner radius (cm), outer radius (cm)

Outer Barrel: half length (cm) , radius (cm)

Outer Disks: z (cm), inner radius (cm), outer radius (cm)

Tracker

Tracker

Eta=0.5 1 1.52

2.5

33.5

6.7

6.

4

5.5

5.

6.5

4.54

Tracker

Eta=0.5 1 1.52

2.5

33.54

Tracker

6 discs from z=8m to z=15m with opening angle of eta=2.5.

Eta 2.5=9.39 degrees

Forward Tracker

6 discs from z=21m to z=24m with opening angle of eta=2.5.

Organization

There is quite some activity on FCC-hh physics and detector studies.

There are quite a few groups doing detector R&D that is targeted towards application in future hadron colliders.

We need to get some idea about ‘who does what’ in order to make consistent make consistent progress.

The FCC management has put in place an MoU structure to have a formal agreement on FCC activities.

MuOs are signed between the FCC management and the participating institutes. The institute representatives form the collaboration board (very similar to the present LHC experiment organization).

For the machine studies this process is already very advanced, for the detector studies and physics studies we have to put this in place in the next months. You will hear from us.

Organization

https://fcc.web.cern.ch/Documents/Organisation/FCC-1502221700-CERN_FCCMoU_Template.docxhttps://fcc.web.cern.ch/Pages/Organisation.aspxhttps://fcc.web.cern.ch/Pages/default.aspx

Meetings

We will try to set the dates for the next FCC hadron detector meetings and physics workshops be throughout the rest of the year a.s.a.p.