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 Construction and tests of a Micromegas TPC endplate prototype for the LC 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 2

June 15, 2010 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

June 15, 2010 P. Colas, K. Fujii - D-RD2 4 Large TPC Prototype for ILC ALTRO readout electronics Cooling duct MicromegasGEM

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

Beijing, 30/03/2010 P. Colas - FJPPL-FCPPL- LCTPC Analysis meeting 6

June 15, 2010 P. Colas, K. Fujii - D-RD2 7 Preliminary Data Analysis Results ( B=1T ) PRF(Pad Response Functions) for GEMs, z ~ 20 cm 20cm drift

June 15, 2010 P. Colas, K. Fujii - D-RD2 8 Preliminary Data Analysis Results ( B=1T ) PRF(Pad Response Functions) fits, z ~ 5 cm B=1T data : comparison of resistive ink and Carbon-loaded Kapton Γ ~ 4 mm δ ~ 14 mm Γ ~ 2.6 mm δ ~ 10 mm

June 15, 2010 P. Colas, K. Fujii - D-RD2 9 Preliminary Data Analysis Results ( B=1T ) Position residuals x row -x track

June 15, 2010 P. Colas, K. Fujii - D-RD2 10 Z=5cm Z=35cm Z=50cm 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) Preliminary Data Analysis Results ( B=1T )

June 15, 2010 P. Colas, K. Fujii - D-RD2 11 Preliminary Data Analysis Results ( B=1T ) Resolution at z=5cm (µm) V mesh (V) Dependence of resolution with data taking conditions

June 15, 2010 P. Colas, K. Fujii - D-RD2 12 Drift velocity measurements ( B=0T ) Vdrift = cm/µs at E=230 V/cm (Magboltz : (gas comp.)) The difference is %

June 15, 2010 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 H 2 0

June 15, 2010 P. Colas, K. Fujii - D-RD2 14 Data Analysis Results (B=0T) Module_4 Module_5 Resolution as a function of drift distance. Modules 4 and 5 are identical, except the routing and PCB technique   / NDOF = 10.6 /10   / NDOF = 13.9 /10 2% uncertainty on Cd : ±1.4 on Neff

June 15, 2010 P. Colas, K. Fujii - D-RD2 15 Preliminary Data Analysis Results ( B=1T ) Module_INKModule_CLK Resolution as a function of drift distance   / NDOF = 29.1 /11   / NDOF = 38.5 /10

June 15, 2010 P. Colas, K. Fujii - D-RD2 16 Uncertainties : Use C D =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 N eff = 38 ± 2 Expected : Neff = 47.7 * 2 / This implies rather low gain fluctuations.

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)  A 16ch S-ALTRO prototype in fall 2010 (CERN) (b)  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) Advanced TPC endplate ( ) June 15, P. Colas, K. Fujii - D-RD2

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 18 NEW ELECTRONICS – FLAT ON THE BACK OF THE MODULE Intermediate step : new T2K electronics

June 15, 2010 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

June 15, 2010 P. Colas, K. Fujii - D-RD2 20

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

PCMAG Originally built for a balloon experiment Used in TPC small prototype beam tests at KEK/PS in 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 Modified PCMAG with 4K GM refrigerators 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) June 15, P. Colas, K. Fujii - D-RD2 SC solenoid modification

June 15, 2010 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.

June 15, 2010 P. Colas, K. Fujii - D-RD2 24