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EPS-HEP 2015, Vienna. 1 Test of MPGD modules with a large prototype Time Projection Chamber Deb Sankar Bhattacharya On behalf of.

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Presentation on theme: "EPS-HEP 2015, Vienna. 1 Test of MPGD modules with a large prototype Time Projection Chamber Deb Sankar Bhattacharya On behalf of."— Presentation transcript:

1 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 1 Test of MPGD modules with a large prototype Time Projection Chamber Deb Sankar Bhattacharya On behalf of

2 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 2 ILD-TPC dimension Length of the TPC ~ 4.6 m Diameter of the TPC ~ 3.6 m Magnetic field ~ 3.5 T Physics goal sets the limit of r-phi resolution to be better than 100 micron over full drift length for 3.5 T magnetic field. ILC is a precision and discovery machine, operating initially at 500 GeV (CM). The 125 GeV Higgs and possibly other Higgses, can be produced at ILC. A TPC as main tracker has the benefits of: Continuous, truly 3-D tracking. Continuous, truly 3-D tracking. Robust pattern recognition. Robust pattern recognition. High efficiency tracking over High efficiency tracking over large momentum range. large momentum range. Low material budget. Low material budget. Resolution requirement

3 ILD-TPC schematic (Large prototype demonstrator) dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 3 MPGD modules can be installed at the endplate. MPGD modules can be installed at the endplate. The candidates are  Gas Electron Multipliers  Micromegas The candidates are  Gas Electron Multipliers  Micromegas Besides pad-based read out, ‘pixel read out’ is also used (which applies Micromegas like technology)

4 Large prototype TPC for ILC dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 4 The movable stage and the 1T magnet. The field cage Drift length = 56.80 cm Inner diameter = 72 cm 1-6 GeV e- beam at DESY

5 Module size: 22 cm × 17 cm Module size: 22 cm × 17 cm Readout: 1726 Pads Readout: 1726 Pads 24 rows 24 rows Pad size: ~ 3 mm × 7 mm Pad size: ~ 3 mm × 7 mm End plate of LP-TPC dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 5 Micromegas module GEM module Module size: 22 cm × 17 cm Module size: 22 cm × 17 cm Readout: 4839 Pads Readout: 4839 Pads 28 rows 28 rows Pad size: ~ 1.26 mm × 5.85 mm Pad size: ~ 1.26 mm × 5.85 mm

6 R -> the surface resistivity of the layer. C -> capacitance per unit area and t is the shaping time of the electronics. Commonly used Carbon Loaded Kapton (CLK) is unavailable now. Commonly used Carbon Loaded Kapton (CLK) is unavailable now. A new resistive material, Diamond Like Carbon (DLC) is available from Japan. A new resistive material, Diamond Like Carbon (DLC) is available from Japan. We used both in the recent beam test during March 2015. We used both in the recent beam test during March 2015. dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 6 In standard Micromegas resolution is given by, charge is dispersed on the resistive foil. It is glued on top of the pads. CLK => 3.13, BD => 4.33 More charge spreading in BD than in CLK At LP-TPC, Resistive Micromegas are used, where Preliminary

7 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 7 Triple GEM stack → Stable operation at high gain The GEMs are divided into 4 parts→ HV stability. The ceramic bars provide mechanical support.  → light weight + thin → minimum dead area  → flat → field uniformity. Measured flatness < 100 micron undulations. Pads per hit = 4.5 Preliminary

8 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 8 In rare cases the trip in one sector triggers a second trip in other sector Only a combination of multiple trips pose a threat to destroy GEM Common ground of different sectors is identified as the probable reason for this. Single trips Double trips Triple trips Preliminary

9 Track on GEM modules Track Micromegas modules 5-GeV electron beam dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 9 Row number Mod 5 Mod 1 Mod 2 Mod 3 Mod 4 Mod 6 Mod 0 Event display demonstrates the different configurations of beam position Mod 2 Mod 1 Mod 0

10 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 10  The beam position on the TPC is plotted against reconstructed time.  Slope gives the drift velocity.  Intersection of two such curves for two different fields gives the time of starting-drift (T0).  The drift time (or length) is calibrated from T0. Measured drift velocity is in very good agreement with simulation. Preliminary

11 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 11 Alignment correction in Micromegas Distortion correction in Micromegas  There could be misalignment between the modules during installation Alignment correction and Distortion correction are done during analysis Alignment correction and Distortion correction are done during analysis Analysis is done in MarlinTPC frame work.  grounded or low potential surfaces near the edges of the module create localized electric field distortion Preliminary Before After B = 0T Before After B = 1T

12 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 12 B=1T, peaking time = 200 ns, E=230 V/cm, phi = o r_phi resolution is below 150 micron for B = 1 T BD and CLK modules are closely comparable BD and CLK modules are closely comparable Preliminary

13 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 13 Preliminary r-phi resolution vs drift distance r-phi resolution vs phi angle For ~ 60 cm drift, r_phi resolution is below 150 micron for B = 1 T, which satisfies ILD criteria application of magnetic field improves the result by reducing diffusion Preliminary

14 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 14 Z resolution vs drift distance The Z resolution in 1 T magnetic field corresponds to the ILD requirement of 0.4 mm resolution at zero drift and 1.4 mm at full drift. of 0.4 mm resolution at zero drift and 1.4 mm at full drift. GEMMicromegas Preliminary 200ns, B=1, high field

15 Heating of electronics dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 15  Each (Micromegas) electronic takes nearly 30 W of power.  This increases the temperature of the detector up to 70 deg C Temperature gradient in ILD-TPC Simulation with COMSOL Drift velocity Vs Temperature Simulation with Magboltz  Electronics can be damaged if it runs for hours without cooling  Temperature gradient in TPC would occur if heat is not removed

16 Two-phase CO2 cooling during 2015 beam test dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 16 Stable temperature during cooling Micromegas electronics and cooling setup During cooling, temperature is below 28 deg C and stable within 0.2 deg C. Preliminary

17 Summary  Different studies have been carried out with Micromegas and GEM modules at Large Prototype TPC since 2008.  A new kind of resistive material, called ‘Diamond Like Carbon’ (DLC) has been recently applied to resistive Micromegas technology.  Detailed studies are carried out on GEM flatness and multiple discharge.  Misalignment and Distortion effects are corrected.  In 1 Tesla magnetic field, for ~60 cm drift length, the space resolutions of both Micromegas and GEM are below 150 micron. This corresponds to ILC requirement of 100 micron resolution, over full drift length, for 3.5 T magnetic filed.  Two-phase CO2 cooling is used uninterruptedly for more than 80 hrs for Micromegas. Temperature of individual Front End Cards (FECs) is below 28 degree C and stable within 0.2 degree C during the beam test. Thanks to Dimitra Tsionou for preparing GEM results 17

18 dsb.physics@gmail.com, EPS-HEP 2015, Vienna.18

19 dsb.physics@gmail.com, EPS-HEP 2015, Vienna.19 Backup Slides

20 dsb.physics@gmail.com, EPS-HEP 2015, Vienna.20 pads mesh EB ~100  m Amplification gap: cathode resistive foil: ~75  m insulator: ~100  m

21 dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 21 Normalised main pulse for BD and CLK The pulse shape of both detectors are nearly detectors are nearly same. same. DLC modules are good substitute for CLK Charge per cluster in BD is slightly more than CLK. This is because, BD has slightly larger capacitance than CLK. Charge per Cluster for CLK and BD modules at 200 ns peaking time of the electronics

22 Field distortion (Micromegas) dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 22 Simulation with COMSOL Cathode MM module 1 MM module 2 Anode mesh mm Potential distribution Micromegas

23 Distortion correction in GEM modules dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 23

24 Two-phase CO2 cooling dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 24 Experimental result with one module Shows the heating and cooling Simulated result for one module Shows heating and cooling Experimental and simulation result for one MM module shows heating and cooling

25 Two-phase CO2 cooling dsb.physics@gmail.com, EPS-HEP 2015, Vienna. 25 simulated model (COMSOL) shows how cooling works

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