Electrostatic beta-spectrometer in the 0,5-50 keV range

An electrostatic spectrometer is constructed for investigations of conversion electron spectra and continuous beta-spectra in the 0.5-50 keV range. The spectrometer consists of two analyzers: spherical decelerator and a double cylindrical mirror analyzer. Beta-particles are detected by a channel electron multiplier. The spectrometer is fully automated on the basis of modules and microcomputer in the CAMAC standard. The slowing down voltage is stabilized with precision of 10-5. The conversion electron spectrum of 169Yb is measured. An energy resolution of 8.1 eV is obtained for 10.6 keV electrons. In the measured value of the natural line width (approximately 5 eV) is also taken into account. The instrumental energy resolution is δE/E approximately 0.06% (i. e. δP/P approximately 0.03%)