Micromegas module for ILC-TPC

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Presentation transcript:

Micromegas module for ILC-TPC TPC Tracker Detector Technology Mini Workshop, Beijing, September 1, 2016 Micromegas module for ILC-TPC A decade of R&D Paul COLAS, CEA Saclay Early tests Magnetic field charge spreading Ion Back Flow Single-module tests Micromegas development Seven-module test Integration issues : electronics, cooling

Introduction TPCs have good records in e+e- physics (ALEPH and DELPHI at LEP), and showed adaptability to dense high-rate environment (STAR, ALICE) MPGDs yield a promise for improvement : smaller structures lead to smaller ExB effects, ion feedback can be naturally suppressed, light construction of large area is possible. Sep. 1, 2016 Micromegas TPC

S1 S2 Charged tracks cross a medium with a low (drift) field : 200 V/cm. Ionization electrons drift to a mesh maintained ~100 µ above sensitive pads : the very high field (O(60kV/cm)) multiplies the electrons. Very small gap : very fast detector Funnel effect: avalanche spread by diffusion of electrons, ions follow back field lines, most of them closing on the mesh. S2/S1 = Edrift/Eamplif ~ 200/60000= 1/300 Micromegas

Charge spreading Continuous RC network spreading evenly the charge over several pads pads mesh E B ~100m Amplification gap: resistive foil: ~75m insulator: ~100m Sep. 1, 2016 Micromegas TPC

Early tests 2001-2002 : Check that Micromegas works in a magnetic field. Requires non-magnetic mesh. Study the ion back flow natural suppression Select gas candidates 2000-2005 : development of the charge-spreading method (M. Dixit et al.). Tested in a 5T field: 30 µm resolution with 2mm pads Sep. 1, 2016 Micromegas TPC

Sep. 1, 2016 Micromegas TPC

EUDET/AIDA Test facility at DESY GEMs Micromegas March 2015 Sep. 1, 2016 Micromegas TPC

Micromegas module Bulk process for MM manufacture Carbon-loaded kapton or Diamond-like carbon as resistive coating Micromegas module Module size: 22 cm × 17 cm Readout: 1726 Pads 24 rows Pad size: ~ 3 mm × 7 mm Chips on board (wire bonding) – The resistive foil suffices to protect against sparks – 0.25 X° thick Sep. 1, 2016 Micromegas TPC

Gating Necessary to fully suppress the space charge produced by ion back flow from the amplification gap Practical solutions under study, e.g. gating GEM (see Akira Sugiyama’s talk) Not possible at CEPC (see Huirong’s talk) Sep. 1, 2016 Micromegas TPC

Perfomance : resolution Resolution 70 µm in rf and 200 µm in z at zero drift distance for 3mm-wide pads Drift dependence follows expectation from diffusion CEFIPRA SC, Tours, Micromegas 18/05/2016

Comparison of distortion between experiment and simulation For the Micromegas modules on the LPTPC endplate. For the simulated Micromegas modules B=0T B=0T Distribution of the residuals as obtained in Experiment after alignment correction. Distribution of the residuals as obtained in Simulation

Comparison of distortion between experiment and simulation For the Micromegas modules on the LPTPC endplate. For the simulated Micromegas modules B=1T B=1T Distribution of the residuals as obtained in Experiment without alignment correction. Distribution of the residuals as obtained in Simulation

2-phase CO2 cooling Can operate at room temperature (requires high pressure, no problem in O(1mm) pipes. Allows more uniform gas temperature and no worry with dripping condensed water. No consequence of leaks : CO2 vaporizes Excellent heat removal (high heat capacity and high latent heat) Very little matter budget Sep. 1, 2016 Micromegas TPC

Thermal simulation of the gas volume and of the endplate modules Thermal inhomogeneities cause changes in drift properties in the gas, hence distortions. Needs simulations. D.S. Bhattacharya Thermal simulation of the gas volume and of the endplate modules 18/05/2016 CEFIPRA SC, Tours, Micromegas

Warming up and cooling down of a module. Good agreement with data 18/05/2016 CEFIPRA SC, Tours, Micromegas

Summary Basic demonstration that a TPC can operate at ILC with required performance is made More work needed to demonstrate that it can work at a CC (time structure, ion back flow) A lot of progress was made in a decade towards an engineered detector Sep. 1, 2016 Micromegas TPC