TY - JOUR
T1 - Evaluation of novel KEK/HPK n-in-p pixel sensors for ATLAS upgrade with testbeam
AU - Nagai, R.
AU - Idárraga, J.
AU - Gallrapp, C.
AU - Unno, Y.
AU - Lounis, A.
AU - Jinnouchi, O.
AU - Takubo, Y.
AU - Hanagaki, K.
AU - Hara, K.
AU - Ikegami, Y.
AU - Kimura, N.
AU - Nagai, K.
AU - Nakano, I.
AU - Takashima, R.
AU - Terada, S.
AU - Tojo, J.
AU - Yorita, K.
AU - Altenheiner, S.
AU - Backhaus, M.
AU - Bomben, M.
AU - Forshaw, D.
AU - George, M.
AU - Janssen, J.
AU - Jentzsch, J.
AU - Lapsien, T.
AU - La Rosa, A.
AU - MacChiolo, A.
AU - Marchiori, G.
AU - Nellist, C.
AU - Rubinsky, I.
AU - Rummler, A.
AU - Troska, G.
AU - Weigell, P.
AU - Weingarten, J.
N1 - Funding Information:
The authors would like to thank the accelerator and beamline crews, especially the ATLAS testbeam coordinator, H. Wilkens for his dedicated support and work done, and D. Muenstermann of CERN, A. Dierlamm and F. Bögelspacher, the team of Karlsruhe Institut für Technologie for the irradiation. R. Nagai acknowledges the financial support from the Global Center of Excellence Program by MEXT, Japan through the “Nanoscience and Quantum Physics” Project of the Tokyo Institute of Technology. This research was supported by the Grant-in-Aid for scientific research (A) (Grant No. 20244038 ) by Japan Society for the Promotion of Science and the Grant-in-Aid for scientific research on advanced basic research (Grant No. 23104002 ) by the Ministry of Education, Culture, Sports, Science and Technology, of Japan. The beamtests were supported by the European Commission under the FP7 Research Infrastructures project AIDA , grant agreement no. 262025 .
PY - 2013/1/21
Y1 - 2013/1/21
N2 - A new type of n-in-p planar pixel sensors have been developed at KEK/HPK in order to cope with the maximum particle fluence of 1-3×1016 1 MeV equivalent neutrons per square centimeter (neq/cm2) in the upcoming LHC upgrades. Four n-in-p devices were connected by bump-bonding to the new ATLAS Pixel front-end chip (FE-I4A) and characterized before and after the irradiation to 2×1015 neq/cm2. These planar sensors are 150μm thick, using biasing structures made out of polysilicon or punch-through dot and isolation structures of common or individual p-stop. Results of measurements with radioactive 90Sr source and with a 120 GeV/c momentum pion beam at the CERN Super Proton Synchrotron (SPS) are presented. The common p-stop isolation structure shows a better performance than the individual p-stop design, after the irradiation. The flat distribution of the collected charge in the depth direction after the irradiation implies that the effect of charge trapping is small, at the fluence, with the bias voltage well above the full depletion voltage.
AB - A new type of n-in-p planar pixel sensors have been developed at KEK/HPK in order to cope with the maximum particle fluence of 1-3×1016 1 MeV equivalent neutrons per square centimeter (neq/cm2) in the upcoming LHC upgrades. Four n-in-p devices were connected by bump-bonding to the new ATLAS Pixel front-end chip (FE-I4A) and characterized before and after the irradiation to 2×1015 neq/cm2. These planar sensors are 150μm thick, using biasing structures made out of polysilicon or punch-through dot and isolation structures of common or individual p-stop. Results of measurements with radioactive 90Sr source and with a 120 GeV/c momentum pion beam at the CERN Super Proton Synchrotron (SPS) are presented. The common p-stop isolation structure shows a better performance than the individual p-stop design, after the irradiation. The flat distribution of the collected charge in the depth direction after the irradiation implies that the effect of charge trapping is small, at the fluence, with the bias voltage well above the full depletion voltage.
KW - ATLAS
KW - HL-LHC
KW - N-in-p
KW - Pixel detector
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U2 - 10.1016/j.nima.2012.04.081
DO - 10.1016/j.nima.2012.04.081
M3 - Article
AN - SCOPUS:84870414908
VL - 699
SP - 78
EP - 83
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
ER -