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DEPFET Active Pixel

depfet_logoThe DEpleted P-channel Field Effect Transistor (DEPFET) is a unique pixel detector developed at the MPI Halbleiterlabor München. By incorporating a field effect transistor into a fully depleted sensor substrate the DEPFET sensor combines radiation detection and amplification in each pixel, resulting in very low noise and high spatial resolution. An ENC of about 2 electrons at room temperature has been measured with single pixel DEPFETs (read more about the operation principle).

This can be exploited for various applications. One of the first projects was the Bioscope System used for biomedical applications with tritium markered samples. Current research focuses on an application as a vertex detector for High Energy Physics experiments like the ILC, a planned Linear Collider. The DEPFET technology was also chosen as the baseline for the pixel sensor in the Belle II experiment at KEK (Japan).

 

layout_depfet

Layout of a DEPFET pixel matrix with shared source structure and drift implantation. The matrix is a prototype design for Belle II DEPFET pixel sensors with a pixel size is 50x75μm²

 

belle_logoBelle II

For the planned upgrade of the b-physics experiment Belle at KEK, Belle II, a new vertex detector of unprecedented performance is needed. It has to cope with  luminosities exceeding 8·1035 s-1cm-2

. It has to face high backgrounds and radiation doses up to 10 Mrad and must be of low mass in order to achieve good impact parameter resolution of low momentum tracks. The detector will use DEPFET active pixel sensors. Read more...

 

vertex_detectorVertex Detector for the International Linear Collider

The planned International Linear Collider (ILC) is an electron-positron collider with center of mass energies of up to 1 TeV. It will allow high precision measurements on new physics in the TeV-scale. For operation at a linear collider the excellent noise performance of DEPFET pixels allows building very thin detectors with high spatial resolution and low power consumption. However, high readout speeds of 50 MHz line rate and 20 kHz for the full detector must be reached. Read more...

 

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