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We have performed a study of several cesium oven designs. A comparisonbetween recirculating (or sticking-wall) or collimating (or reemitting-wall)ovens is made in order to extract the most efficient design in terms of beambrightness. Unfortunately, non-reproducible behaviors have been observed, andthe most often observed output flux is similar to the sticking-wall case, whichis the lowest theoretical value of the two cases, with a beam brightness closeto $10^{18}$ at.sr$^{-1}$.s$^{-1}$.cm$^{-2}$. The reason of this universallyobserved behavior is unclear despite having tested several materials for thecollimating tube. Conclusion on possible improved design based on sticking ofcesium on several (un)cleaned surface is given.

Comparative analysis of recirculating and collimating cesium ovens