A study of the maximum entropy technique for phase space tomography

Abstract

We study a problem with the Maximum Entropy Technique (MENT) when applied totomographic measurements of the transverse phase space of electron beams, and suggestsome ways to improve its reliability. We show that the outcome of a phase spacereconstruction can be highly sensitive to the choice of projection angles. It isquite likely to obtain reconstructed distributions of the phase space that areobviously different from the actual distributions. We propose a methodto obtain a ``good'' choice of projections angles using a normalised phase space.We demonstrate that the resulting reconstructions of the phase space canbe significantly improved.