Status of GEM Development @BHU

1. Status of GEM Development @BHU 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 P.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) P.Garg CBM Collaboration Meeting

4. Some examples of gaseous detectors studies for which Garfield has been used in past • 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 P.Garg CBM Collaboration Meeting

5. MAXWELL - 2D 1.5 mm 0.1 mm 1.4 mm 0.10 cm ? 0.1 mm 0.01 cm 1.4 mm 0.04 cm 0.01 cm 0.15 cm P.Garg CBM Collaboration Meeting

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

7. P.Garg CBM Collaboration Meeting

8. P.Garg CBM Collaboration Meeting

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

10. P.Garg CBM Collaboration Meeting

11. Construction of GEM/THGEM laboratory • 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. P.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) • 55Fe 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 P.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. P.Garg CBM Collaboration Meeting