Summer Student Programme
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1 Summer Student Programme Studies of the electric field strength in a TPC Isabell Steinseifer University of Siegen, Germany Supervisor: Peter Schade Ties Behnke 1
2 Content ILC, FLC and TPC Planar TPC-model Fieldmaps of the TPC-model Drift-plots of the TPC-model 3D-model Summary 2
3 Introduction The International Linear Collider (ILC) will collide electrons with positrons collision energy of 500 to 1000GeV precision measurements of particles FLC = Forschung an Lepton Collidern = research on lepton colliders TPC = subgroup of the FLC group Do research on and design of Time Projection Chambers 3
4 Time Projection Chamber Time Projection Chamber (TPC) Gas filled volume Particles ionise gas (track) Particles drift to anode because of homogeneous electric field x- and y-component can be measured z-component is reconstructed by arrival time Magnetic field to detect charge 4
5 CST calculation Aim: calculating different field strip geometries to get a homogeneous electric field in the drift volume Variation of field strip width Variation of gap Insertion of additional field strips Field calculations done with CST EM-Studio CST allows to calculate 3dim. models Changeable Parameters: Radius Number of field strips Width of field strips 5
6 Planar TPC-Model cathode gap GND fieldstrip Center of chamber anode Cylindric TPC is simplified to a planar model (rotational symmetry, boundary conditions) The field maps illustrate the electric field strength inside the TPC Normalized to nominal value TPC-model with different field strip widths: 1.6mm, 2.0mm and 2.4mm with constant pitch of 2.8mm Meshing: Field strip: 1.6mm 29 mesh cells Gap: 1.2mm 21 mesh cells 6
7 Fiedmaps Width: 1.6mm, Gap: 1.2mm Width: 2.0mm Gap: 0.8mm Width: 2.4mm Gap:0.4mm radial-component z-component 7
8 Drift-plot To evaluate the field quality the drift is simulated Electron started out of every cell Drifted in steps of equal length (0.2mm) towards the anode Assumption v = v(e) for each step Results: Displacement in x Time of arrival (not yet) 8
9 Drift-plots Width: 1.6mm Width: 2.0mm Scale: x-displacement in mm White area illustrates the dead volume Width: 2.4mm 9
10 Failing resistor In the MediTPC 4 parallel resistors connect two neighbouring field strips If one fails (e.g. bad soldering) the resistivity rises by a factor of 4/3 Influence on the field quality? Influence on drift of electrons? Sensitive volume lost? Width: 1.6mm Width: 2.4mm 10
11 Comparison: Width: 1.6mm Width: 1.6mm Width: 2.4mm Working resistor Failing resistor Failing resistor Failing resistor 11
12 Mirror and laser-hole Because of testing the TPC with a laser, it is necessary to insert a mirror in the TPC and to cut a hole in the cathode Calculation is incorrect, because the problem is not rotational symmetric For this problem a cylindric 3D-TPC-model is needed fieldmap drift-plot Example: Width: Gap: mirror: laser-hole: 2.4mm 0.4mm 10mm 7mm 12
13 3D-TPC-model huge 3D-model The mesh cannot be chosen as precise as in case of the planar model Problem: a lot of data, but the calculation is not very accurate 13
14 Summary Field calculations with CST allow to investigate different field strip geometries Fieldmaps illustrate the electric field strength Drift-plot to evaluate different strip geometries Radial displacement Time of arrival Influence of different problems on the electric field strength 3D-TPC-model still in progress No results yet 14
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