Ultra-fast silicon detectors (UFSD)

We report on measurements on Ultra-Fast Silicon Detectors (UFSD) which are based on Low-Gain Avalanche Detectors (LGAD). They are n-on-p sensors with internal charge multiplication due to the presence of a thin, low-resistivity diffusion layer below the junction, obtained with a highly doped implant...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 831; no. C; pp. 18 - 23
Main Authors: Sadrozinski, H.F.-W., Anker, A., Chen, J., Fadeyev, V., Freeman, P., Galloway, Z., Gruey, B., Grabas, H., John, C., Liang, Z., Losakul, R., Mak, S.N., Ng, C.W., Seiden, A., Woods, N., Zatserklyaniy, A., Baldassarri, B., Cartiglia, N., Cenna, F., Ferrero, M., Pellegrini, G., Hidalgo, S., Baselga, M., Carulla, M., Fernandez-Martinez, P., Flores, D., Merlos, A., Quirion, D., Mikuž, M., Kramberger, G., Cindro, V., Mandić, I., Zavrtanik, M.
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 21-09-2016
Elsevier
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Summary:We report on measurements on Ultra-Fast Silicon Detectors (UFSD) which are based on Low-Gain Avalanche Detectors (LGAD). They are n-on-p sensors with internal charge multiplication due to the presence of a thin, low-resistivity diffusion layer below the junction, obtained with a highly doped implant. We have performed several beam tests with LGAD of different gain and report the measured timing resolution, comparing it with laser injection and simulations. For the 300μm thick LGAD, the timing resolution measured at test beams is 120ps while it is 57ps for IR laser, in agreement with simulations using Weightfield2. For the development of thin sensors and their readout electronics, we focused on the understanding of the pulse shapes and point out the pivotal role the sensor capacitance plays.
Bibliography:USDOE
FG02-04ER41286; FPA2013-48308-C2-2-P; FPA2013-48387-C6-2-P; 654168
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2016.03.093