FJPPL workshop @ CNRS 2008 May 15-16th

1. D_R/ D_1 A Common R&D on the new generation detector for the ILC FJPPL workshop @ CNRS 2008 May 15-16th J.-C. Brient LaboratoireLeprinceRinguet

2. France-Japan collaboration on ILC detector R&D : • Detector design (ILD) • PFA studies • GRID use (KEK-CCIN2P3) • Prototyping Ultra Segmented Calorimeter Toward the optimized detector for the final ILC project (LOI for March 09)

3. > Boson tagging in jets decay needs to optimise the di-jet mass resolution > Development of PFA from first tentative at LEP > Use of the GRID - to test the performances on designed detectors - to analyse the test beam data > Design calorimeter optimized on PFA performances ... Lead to ultra segmented device i.e. ECAL W-Si with 120 Mchannels > Design & build ultra segmented prototype tested with Beam ILD

4. ILD studies in D_R/D_1 LOI was announced last fall by ILCSC. Due date is 31 March, 2009. is a base for further developments and detail planning in accordance with the accelerator developments by GDE. Common feature of GLD and LDC: Particle Flow with a very fine grained calorimeter Gaseous tracker supplemented by SI trackers. GLD LDC • Detector concept study groups, LDC and GLD, agreed to write an ILC detector LOI jointly: • International Linear collider Detector (ILD)

5. ILD studies in D_R/D_1 • Global geometry and mechanical constraint • (i.e. Common mechanical design) • Low angle design and MDI • Assembling the detector • (and opening the detector)

6. ILD studies in D_R/D_1 g g g Design of the MDI region Deformation of the ECAL module 8 staves design ECAL-8-3 Fixing lines (3 rails) emax = 0.07 mm

7. PFA studies in D_R/D_1 Particle Flow Analysis: • Measure charged particle by trackers and neutral particles by calorimeter. • High grain calorimeter and sophisticated algorithm is crucial to achieve a • good jet energy resolution - Performance goal was set at 30%/√E (GeV) • Pandora PFA has achieved the goal:For E<100 GeV jets ( Z0 light quark pairs ) & LDC00 detector model ( ~ Tesla TDR detector ) • Next step: Can we achieve similar performance • - for ILC physics processes ? • - for a realistic and optimized detector model ? Summary of Pandora PFA performance w. LDC01 model – SiD meeting, RAL april08

8. PFA with 2x2cm pixels ATLAS expected b=3% (Barrel only) Full sim & rec : PANDORA w/ LDC 01 model ATLAS H1 H1 reach b=5% Ejet ( GeV) ALEPH Ejet ( GeV)

9. PFA studies in D_R/D_1 • Interoperability is a key for international collaboration: standard StdHep/LCIO • Now, Jupiter writes LCIO files for a reconstruction by MarlinReco Generators Analysis Strategy StdHep • According to a preliminary study, Jupiter-GLD data and Mokka-LDC data are compatible in jet energy resolution when analyzed by MarlinReco/Pandora PFA • Detailed comparison is in progress using GLDPrim and LDCPrim detector models. Jupiter Mokka LCIO Satellites MarlinReco Analysis Codes

10. GRID for D_R/D_1 studies Two VOs for the studies are in operation: • CALICE VO: • test beam data & MC are stored on GRID SE. O(100TB) • Standard data processing are performed on GRID • ILC VO: • Crucial for Geant4-based simulation studies in international framework • Huge CPU demand expected: + ex. 10~100 CPU years/detector configuration • ( by F.Gaede, TILC08 ) • Non-negligible data size: + O(10TB) even for generator data As a start up, a GRID system was prepared on the Japanese side and has been used for • Developments of GRID based software tools • Exchange of data through GRID: • - about 500 GB data have been transferred, which is limited by a local storage • capacity. Data transfer will increase significantly in coming months.

11. GRID for D_R/D_1 studies CALICEjobs submitted from IN2P3 had been failing at KEK since last fall. • The issue was discussed in a visit in January and TV meetings afterward. • It turned out that it was caused by a time out for a transfer of large size data through a slow network. • The time out was turned off and the error of CALICE jobs were gone. But the data transfer rate is not satisfactory yet. Thetransfer speedfrom IN2P3 to KEK is typically~200kB/sec recently. - Speeds to other sites in Europe are similar. - Short term solution: Use a multi-port transfer: According to a test, the speed improved linearly up to about 20 ports and could be ~30MB/sec using >100 ports. Drawback: clients in a local network can not use the multi-port transfer. - Long term solution: More systematic monitoring to pin down a bottle neck of data transfer Tuning of network parameters should be considered if effective Lesson:Real use and frequent communication is crucial for a ready-to-use GRID

12. The need of largely segmented calorimeter for ILC leads to the development of a new generation of calorimeter → R&D on mechanics, on VFE electronics, on DAQ, on analysis, but also on Photocounter (MPPC), on silicon , etc... Generic R&D leading to Many application outside the ILC domain Two ECAL projects Czech – French – Korea – UK Tungsten- silicon PIN diodes sampling calorimeter 13 countries 45 institutes 225 phys/eng. ECAL & HCAL Japan – Korea Tungsten- Scintillator read by MPPC (photocounter) • Common DAQ • Common VFE electronics (developed by LAL OMEGA group) • Common test beam infrastructure (Counting room, Drift Ch., Trigger counter, etc...) • Common test beam program , in order to compare the performances

13. Results from DESY TB First test of linearity First test of noise (100ns gating) First look for performances of different config. (scint. Strip – MPPC) casted extruded extruded w TiO2 reflector sheet reflector sheet

14. Results from DESY TB Measured energy spectra + 1% 1 23456 GeV linearity deviation Leakage

15. pi-zero pi+ proton further R&D Fermilab Beam Test with CALICE Fall 2008 2007 FNAL version DESY version pi+n>p+pi0

17. Installation at MTBF-FNAL DAQ , counting room, services, trigger, etc... First test with very low energy pions We foresee comparison with Scint-W R.Poeschl (LAL) Goal of the ECAL 2008 TB > Going down to 1 GeV pion > Debuging the brand New Scintillator – tungsten ECAL > Comparing for Scint-W and Si-W performances on - electron - pion at low and mid energy

18. 8 GeV pion beam Hadronic shower of single pion Simultaneous particle arrival

19. Main members • Japan K. Kawagoe (Kobe-U) T. Takeshita (Shinshu-U) S. Yamashita, T. Yoshioka (U-Tokyo) A. Miyamoto, S. Kawabata, T. Sasaki, G. Iwai (KEK) • France M.Anduze, C.Clerc, J.C. Brient, H. Videau (LLR) M.Joré, C. de la Taille, R. Poeschl (LAL) D. Boutigni (CC-IN2P3) Main meetings and contacts * ’08/01/13~17 (ILD Workshop, DESY/Zeuthen ) Converging from GLD/LDC to ILD ‘08/01/17~21 (LLR, Paris) Discuss issues related to the detector optimization and GRID ‘08/01/21~’08/01/25 (LAL, Paris) Discussing problems in GRID and action plans ’08/03/07 (ILD meeting just after SENDAI workshop, March 08) ‘08/05/15 (CNRS, Paris) Calorimetry integration in ILD *In addition to telephone weekly (almost) meetings

20. D_R/ D_1 Conclusion The Japanese-French collaboration in D_R/D_1has been very useful (mandatory in some case ) > To start to common work on simulation, on PFA reconstruction, but also to establish limitation on the GRID use > To create a single detector concept collaboration ILD > To optimise the use of manpower and money for the detector R&D in test beam > It will be essential in the mid-term comparing different possible ECAL for the PFA approach detector > It will be mandatory for the common LOI (2009) and beyond to start a common detector collaboration

21. SPARE

22. SPARE Towards LOI • GLD and LDC are based on the similar detector concepts. But practically, there are many differences in detector parameters: • B Field: 3 Tesla vs 4 Tesla • Shape of return yoke: Dodecagonal vs Octagonal • Inner radius of Barrel ECAL: 2.1m vs 1.6m • TPC inner radius: 0.45m vs 0.3m • Number of barrel Silicon layers: 4 layers vs 2 layers • … a lot more • A strategy for a unified detector model: Detector Optimization • Detector model will be optimized by using physics benchmark processes. • Benchmark processes, such as ZH, SUSY particles, top, etc, are studied using Geant4 based full simulators and realistic reconstruction packages. • Intermediate detector models, GLDPrim and LDCPrim, are defined as a first step to see performances as a function of detector parameters.In terms of size, GLD > GLDPrim~ LDCPrim > LDC 17 March 2008, KEK Acc. Meeting

23. SPARE Jet energy range of interest for a good Jet energy resolution Distribution of the jets energy For some physics processes √s = 1 TeV   H(2jets) t tbar W ̶ W + √s = 0.5 TeV ZH(120) But which physics need a good Jet energy resolution for this process ? qqbar at 1 TeV Ejet ( GeV)