Precision Measurement of Q-Values by Means of the Munich Time-of-Flight System and the Q3D-Spectrograph
Even in high quality iron magnets the average field may deviate from the field of the location of the NMR probe by some parts in loo. Furthermore this difference may change by about 10−4 due to differential hysteresis.
In the determination of the magnetic rigidity of the bombarding particles in the analyzing magnets a further uncertainty arises from the finite object and image slit width. Therefore the radius of the trajectories of the particles is usually not defined better than to about 5•10−4. Thus the actual radius of curvature may deviate from the nominal radius defined by the centres of the slits by a few parts in 104 because of asymmetries in the beam profiles at the slit positions.
KeywordsPrecision Measurement Exit Channel Main Beam Energy Fluctuation Focal Surface
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