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Novel gamma-ray telescope schemes (silicon wafer stacks, emulsions, gasdetectors) are being developed so as to bridge the sensitivity gap betweenCompton and pair-creation telescopes. The lower average density with respect tothe tungsten/silicon active target of the Fermi-LAT makes large effective-areatelescopes voluminous objects, for which the photon energy measurement byconventional means (calorimeter, magnetic spectrometer, transition radiationdetector) is a challenge for the mass budget of the space mission. We presentan optimal measurement of track momentum by the multiple measurement of theangular deflections induced by multiple scattering in the active target itself,using a Bayesian analysis of the filtering innovations of a series of Kalmanfilters applied to the track. For a silicon-wafer-stack telescope, the methodyields meaningful results up to a couple of GeV/c.

Calorimeter-less gamma-ray telescopes: Optimal measurement of charged  particle momentum from multiple scattering by Bayesian analysis of Kalman  filtering innovations