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

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) 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 LOI was announced last fall by ILCSC. Due date is 31 March, 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. LDC GLD Detector concept study groups, LDC and GLD, agreed to write an ILC detector LOI jointly: International Linear collider Detector (ILD) ILD studies in D_R/D_1

5 Global geometry and mechanical constraint (i.e. Common mechanical design) Low angle design and MDI Assembling the detector (and opening the detector)

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

7 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) Summary of Pandora PFA performance w. LDC01 model – SiD meeting, RAL april08 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 ? PFA studies in D_R/D_1

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

9 Interoperability is a key for international collaboration: standard StdHep/LCIO Now, Jupiter writes LCIO files for a reconstruction by MarlinReco Generators Jupiter SatellitesMarlinReco Mokka Analysis Codes LCIO StdHep Analysis Strategy 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. PFA studies in D_R/D_1

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 CALICE jobs 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. The transfer speed from 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 GRID for D_R/D_1 studies

12  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 Czech – French – Korea – UK Tungsten- silicon PIN diodes sampling calorimeter Japan – Korea Tungsten- Scintillator read by MPPC (photocounter) 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 13 countries 45 institutes 225 phys/eng. ECAL & HCAL Two ECAL projects

13 extruded w TiO2extrudedcasted reflector sheet Results from DESY TB First test of linearity First test of noise (100ns gating) First look for performances of different config. (scint. Strip – MPPC)

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

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

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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 Simultaneous particle arrival Hadronic shower of single pion

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_1 has 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

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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 Akiya Miyamoto 17 March 2008, KEK Acc. Meeting SPARE

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

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