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: 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 June 15, 2010 P. Colas, K. Fujii - D-RD2

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

Large TPC Prototype for ILC ALTRO readout electronics Cooling duct Micromegas GEM June 15, 2010 P. Colas, K. Fujii - D-RD2

Detector Modules 2 Resistive Kapton Resistive Kapton Standard GEM GEM Resistive ink ~2(?) MΩ/□ Resistive Kapton ~5 MΩ/□ Standard 2 Resistive Kapton ~3 MΩ/□ GEM GEM June 15, 2010 P. Colas, K. Fujii - D-RD2

Beijing, 30/03/2010 P. Colas - FJPPL-FCPPL-LCTPC Analysis meeting

PRF(Pad Response Functions) for GEMs, z ~ 20 cm Preliminary Data Analysis Results ( B=1T ) 20cm drift PRF(Pad Response Functions) for GEMs, z ~ 20 cm June 15, 2010 P. Colas, K. Fujii - D-RD2

PRF(Pad Response Functions) fits, z ~ 5 cm Preliminary Data Analysis Results ( B=1T ) Γ ~ 2.6 mm Γ ~ 4 mm δ ~ 10 mm δ ~ 14 mm B=1T data : comparison of resistive ink and Carbon-loaded Kapton PRF(Pad Response Functions) fits, z ~ 5 cm June 15, 2010 P. Colas, K. Fujii - D-RD2

Preliminary Data Analysis Results ( B=1T ) Position residuals xrow-xtrack June 15, 2010 P. Colas, K. Fujii - D-RD2

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

Dependence of resolution with data taking conditions Preliminary Data Analysis Results ( B=1T ) Resolution at z=5cm (µm) Vmesh (V) Dependence of resolution with data taking conditions June 15, 2010 P. Colas, K. Fujii - D-RD2

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 % June 15, 2010 P. Colas, K. Fujii - D-RD2

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

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 = 10.6 /10 c2 / NDOF = 13.9 /10 2% uncertainty on Cd : ±1.4 on Neff June 15, 2010 P. Colas, K. Fujii - D-RD2

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

Resistive ink very non-uniform. 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. June 15, 2010 P. Colas, K. Fujii - D-RD2

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) ALICE TPC (LHC) LC (ILD) TPC  (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  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) June 15, 2010 P. Colas, K. Fujii - D-RD2

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

June 15, 2010 P. Colas, K. Fujii - D-RD2

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 Common Tracking Hits Tracks Track = subset of hits Hit Point Making Readout Technology Dependent Multi-module handling: almost finished Non-uniform B field under development Set of Pulses Set of Hits Set of Tracks Set of Track Param. Vectors June 15, 2010 P. Colas, K. Fujii - D-RD2 Hit Making Tracking = Track Finding x Track Fitting

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 June 15, 2010 P. Colas, K. Fujii - D-RD2

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. June 15, 2010 P. Colas, K. Fujii - D-RD2

Thank you June 15, 2010 P. Colas, K. Fujii - D-RD2