Detector studies Radiation Simulations Organization FCC Hadron Detector

Detector studies, Radiation Simulations, Organization FCC Hadron Detector Meeting July 27 th 2015 W. Riegler

FCC Week 2016 Rome, 11 – 15 April 2016

Goals for April 2016 FCC Week • Document on physics at 100 Te. V. Including detailed characterization of benchmark channels. • Detailed radiation simulations detector technology discussion • Detailed tracker studies • Baseline magnet system(s) • Detailed calorimeter studies • …

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 Center of the FCC ring For the LHC detectors, a coordinate system is used where X points towards the inside of the Ring (0, 0, 0) nominal IP Xph … horizontal towards center of the ring Yph … 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 IP Xph … horizontal towards the outside of the ring Yph … perpendicular to Xph and Yph ‘up’ Zph … clockwise along the beamline, righthanded system

B Field Map

Magnetic Field Yph Xph Zph Provided a Field Map [x, 0, 14], [y, -14, 14], [z, 0, 24]m on a Cartesian grid of 0. 25 m H. Ten Kate, Matthias Mentink et al.

Magnetic Field Yph Xph Zph

Magnetic Field Bz By

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. Eta = 2. 5

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 =2 cm, Rout=2. 1 cm From z=0 to z=800 cm Forward beampipe: Beryllium 1 mm wall thickness Projective cone (inner envelope) along 2. 5 m. Rad opening angle From z=800 cm to z=32000 cm Beampipe Connecting to TAS: From z=3200 to 3230 cm – cone to go from R=8 cm to R=1 cm-2 cm (matching TAS), Aluminum Between 3230 cm and TAS – keep cylindrical beampipe, Aluminum Cylindrical shield around this beampipe will be necessary

Beampipe 4 4. 5 5. 5 6. 6. 5 6. 7

Coils Z=760 cm, R=1347. 5 cm Z=760 cm, R=1300 cm Coils: Pure Aluminum Z=1010 cm, R=625 cm Z=1010 cm, R=782. 5 cm Next Page

Parallelogram with a given thickness in Y direction X=0. 182848*Z+339. 39 Z=2098 R=0. 182848*Z+41. 39 Z=1480 R=0. 182848*Z-15. 61 Coils: Pure Aluminum Rotation around z axis

ECAL, Liquid Argon Eta 2. 5=9. 39 degrees Sandwich total 110 cm: 10 cm Aluminum at 300 K 62 cm Calomix at 87 K 38 cm Aluminum at 300 K Z=2400 cm to z=2510 m Calomix in Volume (%): LArg 64. 8%, Pb 21. 7%, Cu 7. 2%, Polystyrene 6. 3% X 0 of this mix: 2. 06 cm It will be interesting to change this to W, Cu etc. and see the effect on neutrons and background …

HCAL Eta 2. 5=9. 39 degrees Homegenous material 240 cm Rin = 360 cm, Rout = 600 cm Material composition in Volume (%): 80% Fe, 20% Polystyrene λ of this mix = 20. 5 cm Z=2510 cm to z=2750 m

Muon Eta 2. 5=9. 39 degrees Fill entire Volume between coils with Aluminum Z=2750 cm to z=3150 cm Since we aim for an air core muon system we assume 1 X 0 of material in the 3. 6 m of space. Since Radiation length of Al is 9 cm the Al density has to be scale down by a factor 40.

Tracker Eta 2. 5=9. 39 degrees Material composition in Volume (%): Si 20%, C 42%, Cu 2%, Al 6%, Plastic 30% X 0 of this mix: 14. 37 cm We assume 3% of radiation length per layer, i. e. each layer has a thickness of 0. 43 cm.

Tracker Inner Barrel (IB) Inner Disk (ID) Outer Barrel (OB) Outer Disk (OD) 8+1 8 8 10 y 2=240 cm OD OB Y 1=60 cm y 0=2. 2 cm Z 0=0 IB Z 1=100 cm ID Z 2=300 cm Z 3=800 cm

Tracker Inner Barrel: half length (cm) , radius (cm) Outer Barrel: half length (cm) , radius (cm) Inner Disks: z (cm), inner radius (cm), outer radius (cm) Outer Disks: z (cm), inner radius (cm), outer radius (cm)

Tracker

1 Eta=0. 5 Tracker 1. 5 2 2. 5 3 3. 5 4 4 4. 5 5. 5 6. 6. 5 6. 7

Tracker Eta=0. 5 1 1. 5 2 2. 5 3 3. 5 4

Forward Tracker Eta 2. 5=9. 39 degrees 6 discs from z=8 m to z=15 m with opening angle of eta=2. 5. 6 discs from z=21 m to z=24 m with opening angle of eta=2. 5.

Organization

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 progress. The FCC management has put in place an Mo. U structure to have a formal agreement on FCC activities. Mu. Os 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. https: //fcc. web. cern. ch/Pages/default. aspx https: //fcc. web. cern. ch/Pages/Organisation. aspx https: //fcc. web. cern. ch/Documents/Organisation/FCC-1502221700 -CERN_FCCMo. U_Template. docx

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.