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D. Attié, P. Colas, K. Fujii,T. Matsuda, M. Riallot, A. Sugiyama, W. Wang Thanks to

Construction and tests of a Micromegas TPC endplate prototype for the LC. D. Attié, P. Colas, K. Fujii,T. Matsuda, M. Riallot, A. Sugiyama, W. Wang Thanks to M. Dixit, Yun-Ha Shin, S. Turnbull,Yulan Li. 1. Large prototype TPC. Need to make a large prototype to:

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D. Attié, P. Colas, K. Fujii,T. Matsuda, M. Riallot, A. Sugiyama, W. Wang Thanks to

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  1. Construction and tests of a Micromegas TPC endplate prototype for the LC D. Attié, P. Colas, K. Fujii,T. Matsuda, M. Riallot, A. Sugiyama, W. Wang Thanks to M. Dixit, Yun-Ha Shin, S. Turnbull,Yulan Li 1

  2. Large prototype TPC • Need to make a large prototype to: • Study gases and detector design (both GEM and Micromegas) • Assess technical issues : integration, operability, stability,… at a realistic scale • Since December 2008 we test Micromegas+ resistive foil and GEM modules at the EUDET facility. PCMAG improvement in AIDA. • Theoretical understanding of the point resolution. Present step : study of gain fluctuations. • Electronics developments • Integration • Power pulsing • Software developments P. Colas, K. Fujii - D-RD2

  3. Large TPC Prototype for ILC French-Canadian team : one module was installed in the centre of the large TPC each time. Read out by T2K electronics Asian+Lund team : 3 GEM modules readout by ALTRO electronics P. Colas, K. Fujii - D-RD2

  4. Large TPC Prototype for ILC ALTRO readout electronics Cooling duct Micromegas GEM P. Colas, K. Fujii - D-RD2

  5. Detector Modules 2 Resistive Kapton ~3 MΩ/□ Resistive Kapton ~5 MΩ/□ Standard GEM GEM Resistive ink ~2(?) MΩ/□ P. Colas, K. Fujii - D-RD2

  6. P. Colas - FJPPL-FCPPL-LCTPC Analysis meeting

  7. Preliminary Data Analysis Results ( B=1T ) PRF(Pad Response Functions) for GEMs, z ~ 20 cm 20cmdrift P. Colas, K. Fujii - D-RD2

  8. Preliminary Data Analysis Results ( B=1T ) PRF(Pad Response Functions) fits, z ~ 5 cm Γ ~ 2.6 mm Γ ~ 4 mm δ ~ 10 mm δ ~ 14 mm B=1T data : comparison of resistive ink and Carbon-loaded Kapton P. Colas, K. Fujii - D-RD2

  9. Preliminary Data Analysis Results ( B=1T ) Position residuals xrow-xtrack P. Colas, K. Fujii - D-RD2

  10. Preliminary Data Analysis Results ( B=1T ) • Mean Residual vs Row Number • Z-independent distortions • Distortions up to 50 microns • for resistive paint (blue points) • Rms 7 microns for CLK film (red points) Z=5cm Z=35cm Z=50cm P. Colas, K. Fujii - D-RD2

  11. Preliminary Data Analysis Results ( B=1T ) Dependence of resolution with data taking conditions Resolution at z=5cm (µm) Vmesh (V) P. Colas, K. Fujii - D-RD2

  12. Drift velocity measurements ( B=0T ) Vdrift = 7.698 +- 0.040 cm/µs at E=230 V/cm (Magboltz : 7.583+-0.025(gas comp.)) The difference is 1.5+-0.6 % P. Colas, K. Fujii - D-RD2

  13. Drift velocity measurements ( B=0T ) Drift Velocity in Ar/CF4/Iso butane : 95/3/2 compared with Magboltz simulations for - P=1035 hPa, - T=19°C - 35 ppm H20 P. Colas, K. Fujii - D-RD2

  14. Data Analysis Results (B=0T) Resolution as a function of drift distance. Modules 4 and 5 are identical, except the routing and PCB technique Module_4 Module_5 c2 / NDOF = 13.9 /10 c2 / NDOF = 10.6 /10 2% uncertainty on Cd : ±1.4 on Neff P. Colas, K. Fujii - D-RD2

  15. Preliminary Data Analysis Results ( B=1T ) c2 / NDOF = 29.1 /11 c2 / NDOF = 38.5 /10 Module_CLK Module_INK Resolution as a function of drift distance P. Colas, K. Fujii - D-RD2

  16. Uncertainties : Use CD=94.2 ±1.8 at B=1T and B field (± 0.02 T) ->±1.6 Resistive ink very non-uniform. All Carbon-loaded kapton very consistent : average them Neff = 38 ± 2 Expected : Neff = 47.7 * <G>2 / <G2> This implies rather low gain fluctuations. P. Colas, K. Fujii - D-RD2

  17. Advanced TPC endplate (2010-2012) • Small pads (1 x 4 mm) for high double-track separation and high resolution: • Thin endplate for PFA (15% radiation length + low voltage power cables) •  Light mechanical structure of TPC endplate (Cornel/Saclay/DESY) •  High density readout electronics S-ALTRO for MPGD detectors (CERN/Saclay/Lund/TPC Japan)  (a) Development of S-ALTRO: A 64ch analog-digital mixed chip mount directly on the backside of pad plane of MPGD detector.  (b) Issues of power switching, power delivery and cooling (2P-CO2)  (c) Issue of mechanical stability in high magnetic field LC (ILD) TPC ALICE TPC (LHC) •  A 16ch S-ALTRO prototype in fall 2010 (CERN) •  A test board with ADC/FPGA in preparation • One of 12 sections of the test board (TPC Japan/CERN)  • (c)  A test module (Bulk MicroMEGAS) in preparation • to be tested in DESY 5T magnet (Scalay) P. Colas, K. Fujii - D-RD2

  18. Intermediate step : new T2K electronics NEW ELECTRONICS – FLAT ON THE BACK OF THE MODULE Goal: Fully equip 7 modules with more integrated electronics, still based on the T2K AFTER chip: use naked Silicon, wire-bounded on small cards, ADC on the mezzanine, remove/optimize protections,… First prototype basically ready, tests at fall 2010 Then production and characterization of 9 modules in 2011 at the CERN T2K clean room P. Colas, K. Fujii - D-RD2

  19. New T2K Electronics • Backend ready. Gain of factors of 2 in evt rate and thruput • 2 Mezzanine prototypes under test • FECs : in the process of choosing between tenders. More complicated, but no show stopper • Detector PCB ready to be ordered, process under study P. Colas, K. Fujii - D-RD2

  20. P. Colas, K. Fujii - D-RD2

  21. Tracking Software development • Current Status : test beam data with different readout modules have been analyzed with different tracking programs developed independently by different groups. • Desired Environment • A common tracking framework (MarlinTPC) to compare different readout technologies on the same software test bench. • In order to realize this we need the implementation of • a) multi-module handling • b) non-uniform B field • The developed software is to be fed back to the LC-TPC tracking. Two packages being developed in the FJPPL activities 1) Topological track finding + kalman filter based track fitting 2) Combinatorial Kalman filter in which track finding and fitting proceed simultaneously Hits Tracks Track = subset of hits Readout Technology Dependent Hit Point Making • Multi-module handling: almost finished • Non-uniform B field under development Common Tracking Set of Pulses Set of Hits Set of Tracks Set of Track Param. Vectors P. Colas, K. Fujii - D-RD2 Tracking = Track Finding x Track Fitting Hit Making

  22. SC solenoid modification PCMAG Originally built for a balloon experiment Used in TPC small prototype beam tests at KEK/PS in 2004-2006. Being used for LC TPC Large Prototype beam test at DESY (LC TPC/EUDET). Open solenoid of 1T. Thin coil and cryostat (20% radiation length). Require 1,000L Liq. He for an initial cooling and ～200L in a refilling for 6-7 days PCMAG at DESY with GEM/ALTRO TPC Modification funded in AIDA Safe/easy operation by TPC R&D groups. Portability to any beams lines in the world Save Liquid He cost Remove Liq. He reservoir Add two 4KGM refrigerators Schedule: in 2011 (6 months) (Thanks for full cooperation s of the KEK cryogenic group and Toshiba) Modified PCMAG with 4K GM refrigerators P. Colas, K. Fujii - D-RD2

  23. Conclusions and outlook • Since 2005, common analysis work led to deep understanding of the resolution of a GEM or a Micromegas. • Next steps: 7 Micromegas modules to fully equip the present endplate and work on improvement of the common testing facility, endplate, electronics and multi-module software. P. Colas, K. Fujii - D-RD2

  24. Thank you P. Colas, K. Fujii - D-RD2

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