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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