Beam Tomography with Maximum Entropy by Urs Rohrer

<BODY> <H1>Beam Tomography Program for Charged Particle Beam Optics Program by Urs Rohrer</H1> <H4>Beam Tomography with Maximum Entropy original code by Gerald Minerbo</H4> <UL> <LI> <A HREF="ment.htm">Beam Tomography using Maximum Entropy, Urs Rohrer</A> </LI> <LI> <A HREF="projemit.htm">Maximum Entropy Beam Tomography</A> </LI> <LI> <A HREF="psiment.htm">Beam Tomography with Maximum Entropy, Urs Rohrer</A> </LI> </UL> The <B>Beam Tomography</B> Program MENT based on a Maximum Entropy algorithm may be used for computing and graphically displaying projected emittances of charged particle beam optics systems (beam lines). <B>Beam Tomography</B> is a method for reconstructing a multidimensional source from a number of selected projections (e.g. beam profiles). The goal of two-dimensional beam tomography is the reconstruction of the probability distribution in two-dimensional phase space from a few (at least three, one near a waist) measured beam profiles. The Maximum Entropy Beam Tomography (MENT) program has been developed by Gerald Minerbo at the Los Alamos Scientific Laboratory in New Mexico (USA). Usually one can only get a few (between 3 and 6) different views (profiles), which is by far not sufficient for conventional beam tomography programs to reconstruct the originating source. With MENT the lack of data is compensated by selecting from the infinite amount of possible solutions the one with the lowest information content consistent with the available data (maximum entropy beam tomography). At PSI, beam tomography has been tested successfully with three proton beam lines but it was observed that beam tomography based on the MENT algorithm tends to overestimate the beam emittances. <UL> <LI>Therefore this Beam Tomography code is not intended to be used for Medical Applications.</LI> <LI>But this Beam Tomography code is mainly intended to be used for particle beam optical diagnosics purposes.</LI> </UL> </BODY>