Wenxin Wang 105/04/2013. L: 4.7m  : 3.6m Design for an ILD TPC in progress: Each endplate: 80 modules with 8000 pads Spatial Resolution (in a B=3.5T.

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Presentation transcript:

Wenxin Wang 105/04/2013

L: 4.7m  : 3.6m Design for an ILD TPC in progress: Each endplate: 80 modules with 8000 pads Spatial Resolution (in a B=3.5T magnetic field): δ(x) ~ 100 μm for the full 2.3 m drift ILD-TPC for ILC 2 ILD

05/04/20133 Large Prototype-TPC (LP-TPC) Magnet up to 1.2T Field cage: 61 cm length and 72 cm diameter 7 interchangeable modules with keystone shape

05/04/20134 MPGD: Micromegas & GEM Several types of readout modules are studied ReadoutPad Size ElectronicsGroups MPGDs Double GEMs (Laser-etched) (~ 1 × 6 mm 2 Pad) ALTRO Asia Triple GEMs (wet-etched) Desy Micromegas (Resistive anode) (~ 3 × 7 mm 2 Pad) AFTER Saclay- Carleton Micromegas (test with 7 modules) GEM (test with 3 modules)

pads mesh E B resistive foil glue pads mesh E B Pad width limits MPGD TPC resolution Direct signal readout technique : pad width  0 : resolution at Z=0 without diffusion Charge dispersion technique with a resistive anode so that wide pads can be used for centroid determination Micromegas with Resistive Anode 05/04/20135

6 Micromegas module Module size: 23 cm × 17 cm 24 rows × 72 columns Readout: 1726 Pads Pad size: ~3 mm × 7 mm

05/04/20137 Resistive ink ~3 MΩ/□ Resistive Kapton ~5 MΩ/□ Standard Resistive Kapton ~3 MΩ/□ Micromegas modules

Z=5cm Z=35cm Z=50cm Mean Residual vs Row Number Z-independent distortions Distortions up to 50 microns for resistive ink (blue points) Rms 7 microns for CLK film (red points) 8 Uniformity 05/04/2013 Row Number

05/04/20139 Beam test 2008~2011: Test with one module T2K electronics (32cm × 25cm × 14cm ) 2012~2013: Test with multi-modules Integrated electronics ( 23cm × 17cm × 5cm ) Fully integrated Module Resistive Micromegas Detector FEC FEM

05/04/ Event display 2D or 3D display software available Online monitor Offline monitor

05/04/ Drift Velocity Test in 2009 (B=0T): -T2K gas: Ar:CF4:iso=95:3:2 -T=19 o C - P = 1035hPa -H2O:35ppm At E=230 V/cm : V drift = cm/µs (Magboltz : (gas comp.)) The difference is %

05/04/ Gain Study For 6.84 mm pitch and 5 GeV e- Expectations for Ntot: 61.9 (from HEED simulation) ADC Gain

05/04/ Test bench Energy Resolution :~13% rms Gain ~2600 (using collimated source, Vmesh=380V) The 55 Fe source is put in an aluminum collimation tube and fixed on a set of two mechanical arms (X-Y).

05/04/ Spatial resolution Event selection

05/04/ Spatial resolution X (mm) (a) Fit track with all rows (b) Fit track without using hit in row 35 (c) Fit track after selection hits (row 35) Hits selection Row number

05/04/ Spatial resolution B=1 T C d = 94.2 µm/√cm (Magboltz)

05/04/ Compare with GEM ( Spatial resolution )

05/04/ Field distortions B=1T B=0T After alignment B=0T

05/04/ Field distortions Distortions at different drift distances in B=0T or B=1T B=1T B=0T

05/04/ Conclusion A lot of experience has been gained in building and operating Micromegas TPC panels. The characteristics of the Micromegas modules, such as the uniformity, energy resolution, stability have been studied in detail. 7 modules have been successfully tested with full integration of the electronics at the same time. Thanks to the resistive technology, the measured resolution is about 60 microns at zero drift distance with 3 mm wide pads. This meets ILC needs. Distortions are observed. Their detailed study will allow to correct them and improve the design to minimize them.

05/04/ Thank you !

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