Modernization of magnetic lens β-ray spectrometer for on-line experiments

The magnetic lens β-ray spectrometer of Gerholm type for on-line experiments with the mass-separator installed in the proton beam of ''F'' installation and intended for operation on-line with a mass-separator is described. The method for calculating the magnetic field induction values in the spectrometer volume is presented. The calculation values of spectrometer magnetic induction agree well with the experimental ones obtained by the Hall detector within approx. 4% limit. According to the calculated trajectories and photography of electron tracks the helical baffles have been made which transmit 93% of the focused particles. The experimental and computer studies of the form of conversion electron lines permitted three regimes of spectrometer operation with 2.5; 2; 1% resolution and 5; 4; 3% transmission, respectively