Using an Active Pixel Sensor In A Vertex Detector

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Research has shown that Active Pixel CMOS sensors can detect charged particles. We have been studying whether this process can be used in a collider environment. In particular, we studied the effect of radiation with 55 MeV protons. These results show that a fluence of about 2 x 10{sup 12} protons/cm{sup 2} reduces the signal by a factor of two while the noise increases by 25%. A measurement 6 months after exposure shows that the silicon lattice naturally repairs itself. Heating the silicon to 100 C reduced the shot noise and increased the collected charge. CMOS sensors have a reduced ... continued below

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Matis, Howard S.; Bieser, Fred; Chen, Yandong; Gareus, Robin; Kleinfelder, Stuart; Oldenburg, Markus et al. April 22, 2004.

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Research has shown that Active Pixel CMOS sensors can detect charged particles. We have been studying whether this process can be used in a collider environment. In particular, we studied the effect of radiation with 55 MeV protons. These results show that a fluence of about 2 x 10{sup 12} protons/cm{sup 2} reduces the signal by a factor of two while the noise increases by 25%. A measurement 6 months after exposure shows that the silicon lattice naturally repairs itself. Heating the silicon to 100 C reduced the shot noise and increased the collected charge. CMOS sensors have a reduced signal to noise ratio per pixel because charge diffuses to neighboring pixels. We have constructed a photogate to see if this structure can collect more charge per pixel. Results show that a photogate does collect charge in fewer pixels, but it takes about 15 ms to collect all of the electrons produced by a pulse of light.

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  • Journal Name: Nuclear Instruments and Methods in Physics Research Section A; Journal Volume: 549; Journal Issue: 1-3; Related Information: Journal Publication Date: 09/01/2005

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  • Report No.: LBNL--54940
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 860333
  • Archival Resource Key: ark:/67531/metadc781498

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  • April 22, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 1, 2016, 7:55 p.m.

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Matis, Howard S.; Bieser, Fred; Chen, Yandong; Gareus, Robin; Kleinfelder, Stuart; Oldenburg, Markus et al. Using an Active Pixel Sensor In A Vertex Detector, article, April 22, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc781498/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.