PHOTOELECTRON SPECTROMETER WITH ADIABATIC ELECTROSTATIC ENERGY ANALYZER

A photoelectron spectrometer for electron temperature measurement is d escribed. The photoelectrons are energy analyzed after adiabatic expan sion in a spatially-decreasing magnetic field. Due to a magnetic field ratio (10 : 1) the photoelectron total energy is efficiently transfor med into the longitudinal one. This method of analysis permits one to record a large portion of the photoelectrons emerging from the foil ta rget. This provides good sensitivity of the instrument. Some results o f the electron temperature measurements performed at the AMBAL-U facil ity are presented, T(e) = 50 - 80 eV.