OUTLINE

GEM/THGEM Simulation

GEM/THGEM Hardware

04/20/23P.Garg CBM Collaboration Meeting

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)04/20/23P.Garg CBM Collaboration Meeting

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

04/20/23P.Garg CBM Collaboration Meeting

0.1 mm

1.4 mm

1.4 mm

0.1 mm

1.5 mm

?

0.10 cm

0.04 cm

0.15 cm

0.01 cm

0.01 cm

04/20/23P.Garg CBM Collaboration Meeting

ELECTRIC FIELD SURFACE

04/20/23P.Garg CBM Collaboration Meeting

Important for the mapping of drift field, transverse field

04/20/23P.Garg CBM Collaboration Meeting

04/20/23P.Garg CBM Collaboration Meeting

Gas Mixture Drift velocity (drift field)

<clusters/mm>

Intrinsic time resolution

Ar/CO2(70/30) 7 cm/μs(@ 3 kV/cm) 3.3 4.7 ns (@ 3 kV/cm)

Ar/CO2/CF4(60/20/20)

9 cm/μs(@ 3 kV/cm) 5 2.3 ns(@ 3 kV/cm)

Ar/CO2/CF4(45/15/40)

10.5cm/μs(@ 3.5 kV/cm)

5.5 1.7ns (@ 3.5 kV/cm)

Probability of Extraction and collection of Electrons from the Holes

04/20/23P.Garg CBM Collaboration Meeting

04/20/23P.Garg CBM Collaboration Meeting

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.

04/20/23P.Garg CBM Collaboration Meeting

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

04/20/23P.Garg CBM Collaboration Meeting

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.

04/20/23P.Garg CBM Collaboration Meeting