ИСТИНА

After finishing Run III of the Large Hadron Collider, the CMS hadronic endcap calorimeter will be replaced by new High Granularity Calorimeter (HGCal) containing the stainless steel absorber plates. The relative permeability of the stainless steel is assuming to be at the level of 1.001 to 1.005. This study investigates the influence of the material used in the HGCal absorbers onto the CMS solenoid inner magnetic field in the location of the pixel and tracker detectors. The axial forces onto absorbers are calculated for different values of the relative permeability. The magnetic field double integrals characterizing the measured charged particle momentum resolution are also calculated and compared with the integral values in the present CMS solenoid inner magnetic field.