6533b824fe1ef96bd1280874

RESEARCH PRODUCT

High Voltage Monolithic Active Pixel Sensors

subject

description

Ever higher demands on resolution and rate capability drive the development of particle tracking detectors. Especially at low momenta, multiple Coulomb scattering in the material of the detector is also strongly affecting the resolution of momentum measurements. While gas-based detectors such as drift chambers and time projection chambers can be built with very small amounts of material, their rate capability is limited by ageing and space charge effects. Hybrid semiconductor detectors on the other hand combine a depleted (silicon) sensor with a custom amplifier and readout chip. Pixelated devices especially can operate efficiently in very harsh rate and radiation environments such as the innermost parts of the general purpose LHC experiments. The large amount of material introduced by two semiconductor devices connected by a bump bond for each pixel, however, precludes precise tracking of low momentum particles.