Geometry optimization of a barrel silicon pixelated tracker

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Qing-Yuan Liu, Meng Wang and Marc Winter. Geometry optimization of a barrel silicon pixelated tracker[J]. Chinese Physics C, 2017, 41(8): 086001. doi: 10.1088/1674-1137/41/8/086001
Qing-Yuan Liu, Meng Wang and Marc Winter. Geometry optimization of a barrel silicon pixelated tracker[J]. Chinese Physics C, 2017, 41(8): 086001.  doi: 10.1088/1674-1137/41/8/086001 shu
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Received: 2017-02-14
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    Supported by National Natural Science Foundation of China (U1232202)

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Geometry optimization of a barrel silicon pixelated tracker

    Corresponding author: Meng Wang,
  • 1. School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE), Shandong University, Jinan 250100, China
  • 2. Université
  • 3.  School of Physics and Key Laboratory of Particle Physics and Particle Irradiation(MOE), Shandong University, Jinan 250100, China
  • 4.  Université
Fund Project:  Supported by National Natural Science Foundation of China (U1232202)

Abstract: We have studied optimization of the design of a barrel-shaped pixelated tracker for given spatial boundaries. The optimization includes choice of number of layers and layer spacing. Focusing on tracking performance only, momentum resolution is chosen as the figure of merit. The layer spacing is studied based on Gluckstern's method and a numerical geometry scan of all possible tracker layouts. A formula to give the optimal geometry for curvature measurement is derived in the case of negligible multiple scattering to deal with trajectories of very high momentum particles. The result is validated by a numerical scan method, which could also be implemented with any track fitting algorithm involving material effects, to search for the optimal layer spacing and to determine the total number of layers for the momentum range of interest under the same magnetic field. The geometry optimization of an inner silicon pixel tracker proposed for BESⅢ is also studied by using a numerical scan and these results are compared with Geant4-based simulations.

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