The research of the superconducting undulator prototype with neutral poles and features of the magnetic field distribution in it.
The article describes superconducting undulator prototype with neutral poles designed and fabricated in Budker Institute of Nuclear Physics. In the upper half of the undulator even-numbered poles have a core with a winding and odd - core without winding. In the lower half vice versa. This design allows to provide more accurate period and reduces the probability of mechanical movements caused by the action of ponderomotive forces leading to quench of superconductivity. The article also describes the features of the magnetic field distribution in such windings configuration.