Timepix+GEM project Field cage simulations

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Presentation transcript:

Timepix+GEM project Field cage simulations M. Alfonsi, G. Croci

Preliminary studies - outline TOOLS Ansys or Garfield/neBEM for the field map calculation Garfield for the plots and the results METHOD TO EVALUATE FIELD DISTORSION Definition of the geometries to study No field cages as reference case Benchmark graphs Definition of a benchmark quantity 23/03/2010 M. Alfonsi (CERN)

Geometry under study Ansys Garfield Active region: ± 0.7 cm 23/03/2010 M. Alfonsi (CERN)

Geometry under study (II) 5 cm field cage Alternate ceramic walls and metallic rings The reference case is the 5 cm drift region without any metallic ring Geometrical parameters are: Number of rings Ceramic wall thickness Metal thickness, i.e. how far are field electrodes from the active area 23/03/2010 M. Alfonsi (CERN)

Reference case 23/03/2010 M. Alfonsi (CERN)

Rings = 3 metal 0.8 mm far 23/03/2010 M. Alfonsi (CERN)

Benchmark parameter definition Evaluation of: √ (Ex2 + Ey2) / Ez over a grid of ~ 10000 points in the volume of interest: ± 1 cm (x-y direction) 0 ÷ 5 cm (z direction) Region of interest Grid of ~10000 benchmark points Active region: ± 0.7 cm 23/03/2010 M. Alfonsi (CERN)

Preliminary results Geometry Average distorsion Maximum distorsion (place) No field electrodes Ansys (refined 1, 0) 8.60% 26.4% at (1.0, -1.0, 0.8) neBEM 2.22% 12.26% at (-1.0, 0.4, 3.4) 3 rings, 0.8 mm far ANSYS 0.998% 5.51% at (1.0, 1.0, 0.8) 23/03/2010 M. Alfonsi (CERN)

Problems & Plans Increasing the number of field electrodes, neBEM fails and ANSYS generate a too large number of elements for GARFIELD I will use directly ANSYS for calculations I will vary the number of field electrodes and the distance of them from active area I will keep the ceramic wall at the same distance (if computation is faster) 23/03/2010 M. Alfonsi (CERN)