Focusing system of the modified betatron: design, technology, manufacturing and test

In order to test the medium-energy electron cooling system based on modified betatron the design and construction of such a system prototype (MOBY) was started at JINR. Longitudinal magnetic field of 1 kG of the MOBY is provided by the solenoid system surrounded with a magnetic shielding of 8 mm thickness. The solenoids consist of several sections. The single-layer winding with six copper bars of the 'returning current' is placed inside the magnetic shielding. The bars are isolated and placed inside the slits in the magnetic shielding. The winding of each solenoid is made of copper pipe with the rectangular cross-section 18.5x18.5 mm. The design, the technology of solenoid manufacturing, and the method of the magnetic field measurements are presented