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Описание
Adequate modeling the magnetic field in modern accelerator facilities is a critical aspect in estimating the momentum resolution of charged particles. In this study, to quantify the the magnetic field quality inside the inner tracker, a magnetic field double integrals method is applied. This method is described in detail and is used to characterize the magnetic field quality in the CMS detector, as well as in various magnetic system configurations for the planned FCC-hh detector. In the CMS detector, the method is applied to the internal tracker volume with a diameter of 2.27 m and a length of 5.6 m, subjected to a magnetic flux density of 3.8 T. The FCC-hh detector tracker volume, considered as having a diameter of 3.1 m, consists of one central cylinder with a length of 10 m and two outer cylinders, each 6 m long, separated by 5 m from the central cylinder. The magnetic flux density in the central cylinder is 4 or 4.24 T, depending on the magnetic system configuration. The magnetic flux density in the outer cylinders is 3.2 or 3.04 T, depending on the magnetic system configuration. In the CMS detector, the contribution of the magnetic field inhomogeneity to the charged particle transverse momentum resolution does not exceed 1.31% in the pseudorapidity range of 1.63 <|η| < 3. In the planned FCC-hh detector, the contribution of the magnetic field inhomogeneity to the charged particle transverse momentum resolution does not exceed 1.94% or 2.56% in the pseudorapidity interval of |η| < 1.89, depending on the magnetic system configuration. In the pseudorapidity interval of 3.03 <|η| < 4 the contribution of the magnetic field inhomogeneity to the charged particle transverse momentum resolution is of 18–20%, depending on the magnetic system configuration. The application of the presented methods at existing and future national facilities, such as MPD/NICA, detectors at the UNK proton accelerator and others, appears to be a very promising task.
