1. High Energy Physics Group Department Of Physics Banaras Hindu University Prakhar Garg (A. Kumar, A. Prakash, B.K Singh, V. Singh & C.P Singh)

2. OUTLINE GEM/THGEM Simulation GEM/THGEM Hardware 11/12/2015P.Garg CBM Collaboration Meeting

3. Detector Simulation Tools Maxwell (Ansoft) Electrical field maps in 2-D and 3-D, Finite elements calculations for arbitrary electrode and dielectric. Heed (Yale) Energy loss, Ionization and cluster production process. Magboltz (Liverpool) (Electron transport properties: drift velocity, diffusion coefficient, multiplication ) IMONTE Computes the Townsend and attachment coefficients. GARFIELD (CERN) (Fields, Drift Properties, Signals: interfaced to all above programs) 11/12/2015P.Garg CBM Collaboration Meeting

4.  Resolution and calibration of the Atlas muontubes  Wire movements in the Alice RICH  Diffusion study for Micromegas  CMS barrel muon drift tubes (containing comparisons of Magboltz gas data to measurements)  Electrostatic study of a mini TPC for PEP2 commissioning  Study of the drift properties in the HADES drift chamber prototype  Effect of the water contents on the transport properties of a gas  Calculation of the gain in straw tubes  Micro pattern detector simulation using finite element methods  Avalanche simulation in a GEM foil Some examples of gaseous detectors studies for which Garfield has been used in past 11/12/2015P.Garg CBM Collaboration Meeting

5. 0.1 mm 1.4 mm 0.1 mm 1.5 mm ? 0.10 cm 0.04 cm 0.15 cm 0.01 cm 11/12/2015P.Garg CBM Collaboration Meeting

6. ELECTRIC FIELD SURFACE 11/12/2015P.Garg CBM Collaboration Meeting Important for the mapping of drift field, transverse field

7. 11/12/2015P.Garg CBM Collaboration Meeting

8. 11/12/2015P.Garg CBM Collaboration Meeting Gas MixtureDrift velocity (drift field) Intrinsic time resolution Ar/CO 2 (70/30)7 cm/μs(@ 3 kV/cm)3.34.7 ns (@ 3 kV/cm) Ar/CO 2 /CF 4 (60/20/2 0) 9 cm/μs(@ 3 kV/cm)52.3 ns(@ 3 kV/cm) Ar/CO 2 /CF 4 (45/15/4 0) 10.5cm/μs(@ 3.5 kV/cm)5.51.7ns (@ 3.5 kV/cm)

9. Probability of Extraction and collection of Electrons from the Holes 11/12/2015P.Garg CBM Collaboration Meeting

10. 11/12/2015P.Garg CBM Collaboration Meeting

11. In existing laboratory space, we have furnished a modern laboratory (20 ft*12 ft) for setting up a GEM laboratory under clean condition atmosphere. With the financial assistance from DST, New Delhi under FAIR project, construction (mostly civil) is underway and in one year period, BHU will have a new research laboratory (30 ft * 20 ft area) for CBM experiment. 11/12/2015P.Garg CBM Collaboration Meeting

12. Electronics procurement NIM Crate (Ortec made) Spectroscopic Amplifier (Ortec made 572A) High Voltage Power Supply (CAEN N471A) Charge-sensitive Pre-amplifier (Ortec made 142 series) 8 K multichannel Analyzer with MAESTRO 32 software (Ortec made) 55 Fe radioactive sealed source (10 mCi) Lecroy 400 MHz oscilloscope Laminar Flow workstation (for Clean atmosphere) Turbomolecular Pump (250 l/sec) with a dry baking pump Thick GEM of small sizes 11/12/2015P.Garg CBM Collaboration Meeting

13. Procurement of Vacuum Chamber and Gas purifying system We are in the process to procure a vacuum chamber where a single GEM/THGEM or a cascade of GEM/THGEM can be placed and tested. Also a gas purifying system is going to be procured for GEM test. 11/12/2015P.Garg CBM Collaboration Meeting