Electrostatic Distortion Studies at SINP Kolkata and DESY

Studies on electrostatic distortion were conducted at SINP Kolkata and DESY, focusing on a Large Prototype TPC experiment with Bulk Micromegas modules. The experiments included varying electron beam energies, gas mixtures, cosmic ray data collection, drift velocity estimation, and more. Distortions in residual data and electric fields were analyzed, along with simulated models and potential contour plots. Electron drift lines and histograms of residuals were also examined, shedding light on the effects of magnetic fields.

• Electrostatic Distortion
• SINP Kolkata
• DESY
• Large Prototype TPC
• Micromegas Modules

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1. Studies on Electrostatic Distortion SINP Kolkata

2. Test Beam Experiment at DESY (2013) Large Prototype TPC with an end-plate, using seven Bulk Micromegas modules Variation of DESY electron beam energy from 1 5 GeV during various phases of experiment Gas mixture of Ar:CF4:ISO-C4H10 (95:3:2) Collection of data related to the cosmic rays, drift velocity estimation, Z scan, phi scan, variation of gain, effect of different shaping times, effect of different magnetic fields Distortion in the residual data at the edge of the module Electric field distortion introduced by the gap between two modules 3/26/2015 Studies on Electrostatic Distortion 2

3. Simulated model: Two modules placed next to each other Closer view of the edge of one module 3/26/2015 Studies on Electrostatic Distortion 3

4. Potential contour Electric field in axial direction Electric field in poloidal direction 3/26/2015 Studies on Electrostatic Distortion 4

5. Electron drift lines Without considering diffusion B = 1 T B = 0 T 3/26/2015 Studies on Electrostatic Distortion 5

6. Histogram of residual along X-Axis B = 0 T B = 1 T 3/26/2015 Studies on Electrostatic Distortion 6

7. Histogram of residual along Y-Axis B = 0 T B = 1 T 3/26/2015 Studies on Electrostatic Distortion 7