Bb. Sorcini et S. Rosander, ENERGY-DISTRIBUTIONS FROM A RACETRACK MICROTRON MEASURED WITH A MAGNETIC SPECTROMETER, Medical physics, 20(3), 1993, pp. 695-702
Energy spectra of accelerated electron beams from a racetrack microtro
n were measured using a magnetic spectrometer. The spectrometer utiliz
ed a 90-degrees dipole magnet. A ray-tracing program was developed to
determine the slit positions of the spectrometer based on a detailed m
ap 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 probabl
e energy E(p) is 0.22% (one approximate standard deviation) and the a
posteriori uncertainty (previously often called random or class A unce
rtainty) is 0.04% (1sigma). The estimated energy resolution (DELTAE/E)
of the spectrometer is 4 X 10(-4). Spectral energy distributions of t
he electron beam were measured at a E(p)=21.1 and 51.6 MeV, and the ob
tained full width at half-maximum of the energy distributions were 53
and 34 keV, respectively. All the measurements were performed in vacuu
m to minimize the influence of electron energy loss and scatter.