Beam test of Linear Collider TPC Micromegas module with fully integrated electronics * D. Attié, A. Bellerive, P. Colas, E. Delagnes, M. Dixit, I. Giamatoris,

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Presentation transcript:

Beam test of Linear Collider TPC Micromegas module with fully integrated electronics * D. Attié, A. Bellerive, P. Colas, E. Delagnes, M. Dixit, I. Giamatoris, P. Hayman, J.-P. Martin, M. Riallot, N. Shiell, Y-H Shin and W. Wang (Saclay, Carleton, Montreal, TRIUMF) Tracking & Vertexing 27 Sept 2011, LCWS11 Granada Madhu Dixit Carleton University & TRIUMF On behalf of LC TPC collaboration Micromegas group *

Outline The Time Projection Chamber for the Linear Collider Micro Pattern Gas Detector options for ILD TPC readout: Standard GEM readout Micromegas with charge dispersion, a new MPGD readout concept 1 meter Large Prototype TPC (LP TPC) development & tests at DESY to establish the design parameters for the ILD-TPC Summary of LP TPC tests with a single Micromegas module ( ) to measure single hit transverse resolution, TPC readout electronics adapted from T2K TPCs LP TPC first results with the first of 7+2 (spare) Micromegas modules: To measure & demonstrate momentum resolution performance To address integration issues, serial production and characterization, multimodule issues (alignment, distortions) Summary Dixit2LCWS11 Granada

The TPC central tracker for the Linear Collider The ILD detector concept plans to use a ~2.2 meter drift TPC read out with Micro Pattern Gas Detectors Unprecedented transverse resolution goals driven by model independent Higgs measurements limited only by the precision of collision energy Measure 200 track points  r,  ≤ 100 m (stiff radial tracks, full drift distance)  z ≈ m (zero to full drift) Double hit resolution: ≈ 2mm in (r,) ≈ 6 mm in z dE/dx ~ 5% Conventional wire/pad TPC limited by intrinsic ExB effects Dixit3LCWS11 Granada

3-5 mm ~ 100 µm Signal too narrow for conventional Micromegas for good resolution with 1 mm wide pads GEM resolution ok ~ 1 mm wide pads Micro-Pattern Gas Detector (MPGD) readout for Linear Collider TPC Dixit4LCWS11 Granada

Micro-Pattern Gas Detector Options for ILD TPC Readout For the GEM, increased transverse diffusion in the transfer & induction gaps provides a natural mechanism to disperse avalanche charge facilitating pad centroid determination from charge sharing The conventional GEM readout would use narrow ~1 mm wide pads to achieve the 100 µm ILD TPC resolution goal The Micromegas exploits the concept of charge dispersion in Micro Pattern Gas Detectors with a resistive anode and can use wider pads to achieve the ILD resolution goal A resolution of 50 µm at zero drift distance has been achieved with ~3 mm wide pads for the charge dispersion Micromegas TPC readout option Dixit5LCWS11 Granada MPGDs have no preferred track angle & negligible ExB effect

Concept first proven for the GEM. Modified anode with a high resistivity film bonded to a readout plane with an insulating spacer. 2-dimensional continuous RC network defined by material properties & geometry. Point charge at r=0 & t=0 disperses with time. Time dependent charge dispersion on anode facilitates precision pad centroid determination. Equation for anode surface charge density function on the 2D continuous RC network:  (r,t) integral over pads  (r) Q r / mm mmns Charge dispersion in a MPGD with a resistive anode Dixit6LCWS11 Granada

Large Prototype LP TPC - EUDET Test Facility at DESY SiPM Cosmic Trigger Setup LP : part of a TPC endplate PCMAG: superconducting solenoid, B = 1.2T e - test beam at DESY (1GeV/c<p<6GeV/c) Translation stage Dixit7LCWS11 Granada

LP TPC tests with a single Micromegas module ( ) Resistive ink ~3 MΩ/ □ Resistive Kapton ~5 MΩ/ □ Standard Resistive Kapton ~3 MΩ/ □ Bulk Micromegas: pillars hold the mesh on the whole surface: no need for frame Resistive bulk: continuous 2D RC network to disperse the charge Dixit8LCWS11 Granada The LP TPC was outfitted & tested with different Micromegas modules (one at a time) to compare performance

Micromegas LP TPC readout module pad layout Z=20cm, 200 ns shaping Relative fraction of ‘charge’ seen by the pad, vs x(pad)-x(track) 24 rows x 72 columns 3 x 6.8 mm² pads 0 Dixit9LCWS11 Granada

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) Track position dependent bias due to non-uniformities in anode film resistivity and readout structure assembly Carbon loaded Kapton is much more uniform than resistive ink Dixit10LCWS11 Granada

Response to cosmic rays & beam particles Average charge by row Using cosmic-ray events B=OT Excellent uniformity up to the edge of the readout module for the ‘bulk’ Micromegas technology. Average charge by row Using 5 GeV electrons B=1T z distribution Dixit11LCWS11 Granada

Module 4 Single hit transverse resolution measurement (B = 0T & 1T) Carbon-loaded Kapton ( Carbon-loaded Kapton ( ~5 MΩ/ □ ) B=0 T C d = µm/√cm (Magboltz) Module 3 B=1 T C d = 94.2 µm/√cm (Magboltz) χ 2 /Ndof = 10.6/10 χ 2 /Ndof = 29.1/11 Average of B=0T data and B=1T data N eff = 38.0±0.2(stat) ±0.8 (C d syst) σ 0 = 59 ± 3 µm Dixit12LCWS11 Granada

180 kHz (5 x 2 cm² beam) showed no charging effects and stable operation Peaking time ~300 ns sufficient to distinguish 2 tracks on the same pad 4µs Time (in 40 ns bins) Test in a high intensity pion beam at CERN (July 2010) Dixit13LCWS11 Granada

Toward 7+2 module project and electronics integration Dixit14LCWS11 Granada

Beam test of first Micromegas module with integrated electronics - May 2011 New detector: new routing to adapt to new connectors, lower anode resistivity (3 M Ω / □ ), new resistive film, grounding on the edge of the PCB. New 300 points flat connectors New front end: keep naked AFTER chips and remove double diodes (depend on resistive film to protect against sparks) New Front End Mezzanine (FEM) New backend ready for up to 12 modules New DAQ, 7-module ready and more compact format New trigger discriminator and logic (FPGA) Dixit15LCWS11 Granada

Integrated electronics for 7-module project Remove packaging and protection diodes Wire –bond AFTER chips Use 2 × 300 pins connector Use tiniest resistors (1 mm × 0.5 mm) from O to 10 25 cm 14 cm 0,78 cm 0,74 cm 4,5 cm 12,5 cm 2,8 cm 3,5 cm FEC Chip After 2 weeks of operation: no ASIC lost. The resistive film protects against sparks. Dixit16LCWS11 Granada

First prototype of electronics readout board Dixit17LCWS11 Granada

Dixit18LCWS11 Granada New Micromegas module with integrated electronics

Toward 7 Module Analysis with Marlin Integration Dixit19LCWS11 Granada Existing single module software was ported from Fortran and is incompatible with Marlin Progress to date: Converted most anonymous namespaces to classes (named remaining namespaces) Ensured classes have only relevant functions Moved main function out of library Turned separate PRF, BIAS, & DD analysis code into proper subclasses selected based on command-line user input Removed all errors revealed by compiling with -Wall Organized files into proper “include” and “source” files Begin to implement proper C++ coding practices Further work to be done: Marlin consistent co-ordinate system Multihit capability Implement version control (SVN) Check for any classes/functions that are already implemented in Marlin Modify front end of code to be consistent with Marlin “Processes” Apply Marlin coding standards (including cmake)

A new Pad Response Function (PRF) Dixit20LCWS11 Granada Existing 4 parameter PRF (ratio of two symmetric quartics) replaced with a simpler one: Only two parameters Easier to work with Better fits to data (mm)

Bias before and after bias calibration Dixit21LCWS11 Granada With no external silicon tracker information the accuracy of bias calibration, determined from internal consistency of TPC data, is statistically limited Bias before Bias after ~ 20 µm

Preliminary results of new module beam test (B=1T) May 2011 Transverse resolution dependence on peaking time Dixit22LCWS11 Granada

Short peaking time preferable for timing & two track resolution Dixit23LCWS11 Granada Small Z => Better resolution for shorter peaking time Large Z => Better resolution for longer peaking time However, we get:=> Work in progress: Reintegrate short peaking time signal for good resolution at all Z

SUMMARY A baseline Micromegas module for LP TPC is now well defined A module with fully integrated electronics has been tested in a beam. Resolution ~ 50µm for 3mm wide pads Seven module analysis software development in progress A serial production and characterization will be carried out in A test bench at CERN will be used to study the uniformity and thermal properties Dixit24LCWS11 Granada

Spare slides Dixit25LCWS11 Granada

Abstract The Micromegas option for the ILD TPC readout exploits the new concept of charge dispersion in Micro Pattern Gas Detectors with a resistive anode. The Large Prototype TPC (LP TPC) beam tests done so far with a single Micromegas module have demonstrated that the requisite single hit transverse resolution can be achieved. Toward demonstrating the ILD TPC momentum resolution goal, the LP TPC was outfitted and tested earlier this year at DESY with the first of seven Micromegas modules to be built with on-board integrated electronics. The present status of development & results from the beam test will be presented. Dixit26LCWS11 Granada

Dixit27LCWS11 Granada

Old PRF – Ratio of two symmetric quartics Dixit28LCWS11 Granada