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The gamma-to-electron magnetic spectrometer, having better than 5% energy resolution, is proposed to resolve γ-rays in the range of Eo ± 20% in single shot, where Eo is the central energy and is tunable from 2 to 25 MeV. Gamma-rays from inertial confinement fusion implosions interact with a thin Compton converter (e.g., beryllium) located at approximately 300 cm from the target chamber center (TCC). Scattered electrons out of the Compton converter enter an electromagnet placed outside the NIF chamber (approximately 600 cm from TCC) where energy selection takes place. The electromagnet provides tunable Eo over a broad range in a compact manner. Energy resolved electrons are measured by an array of quartz Cherenkov converters coupled to photomultipliers. Given 100 detectable electrons in the energy bins of interest, 3 × 1014 minimum deuterium/tritium (DT) neutrons will be required to measure the 4.44 MeV 12C γ-rays assuming 200 mg/cm2 plastic ablator areal density and 3 × 1015 minimum DT neutrons to measure the 16.75 MeV DT γ-ray line. [ABSTRACT FROM AUTHOR]