Medipix 2

Michal Platkevič

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Medipix

Medipix 2 and Medipix 3 are collaborations between number of European Universities and Research Institutes. The aim of the Collaboration is to carry out the design and evalutation of the semiconductor pixel detectors called Medipix (or newly Timepix). The hybrid silicon pixel detector device Medipix was designed for imaging by single quantum counting in each pixel. The device consists of a pixelated sensor chip and a read-out chip containing the amplifier, discriminators and counter(s) for each pixel.

Parameters of Medipix:

• Pixels: 256 x 256
• Pixel size: 55 x 55 mm2
• Area: 1.5 x 1.5 cm2

Medipix chipboard

Medipix - counting

• Planar pixellated detector (Si, GaAs, CdTe) is bump-bonded to read-out chip.
• Ionizing particle creates a charge in a sensitive volume.
• The charge in each pixel is amplified and compared with a threshold.
• Digital counter is incremented.