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Energy distributions from a racetrack microtron measured with a magnetic spectrometer
Author(s) -
Sorcini B. B.,
Rosander S.
Publication year - 1993
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.597018
Subject(s) - spectrometer , microtron , physics , electron spectrometer , magnetic field , atomic physics , energy (signal processing) , electron , computational physics , optics , nuclear physics , cathode ray , quantum mechanics
Energy spectra of accelerated electron beams from a racetrack microtron were measured using a magnetic spectrometer. The spectrometer utilized a 90° dipole magnet. A ray‐tracing program was developed to determine the slit positions of the spectrometer based on a detailed map of the magnetic field measured at field strengths corresponding to about 20 and 50 MeV. The total a priori uncertainty (previously often called systematic or class B uncertainty) of the measured most probable energy E p is 0.22% (one approximate standard deviation) and the a posteriori uncertainty (previously often called random or class A uncertainty) is 0.04% (1σ). The estimated energy resolution (Δ E / E ) of the spectrometer is 4×10 −4 . Spectral energy distributions of the electron beam were measured at a E p =21.1 and 51.6 MeV, and the obtained full width at half‐maximum of the energy distributions were 53 and 34 keV, respectively. All the measurements were performed in vacuum to minimize the influence of electron energy loss and scatter.