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As a contribution to the understanding of the dark energy concept, the Darkenergy American French Team (DAFT, in French FADA) has started a large projectto characterize statistically high redshift galaxy clusters, infer cosmologicalconstraints from Weak Lensing Tomography, and understand biases relevant forconstraining dark energy and cluster physics in future cluster and cosmologicalexperiments. The purpose of this paper is to establish the basis of referencefor the photo-z determination used in all our subsequent papers, including weaklensing tomography studies. This project is based on a sample of 91 highredshift (z>0.4), massive clusters with existing HST imaging, for which we arepresently performing complementary multi-wavelength imaging. This allows us inparticular to estimate spectral types and determine accurate photometricredshifts for galaxies along the lines of sight to the first ten clusters forwhich all the required data are available down to a limit of I_AB=24/24.5 withthe LePhare software. The accuracy in redshift is of the order of 0.05 for therange 0.2<z<1.5. We verified that the technique applied to obtain photometricredshifts works well by comparing our results to with previous works. Inclusters, photoz accuracy is degraded for bright absolute magnitudes and forthe latest and earliest type galaxies. The photoz accuracy also only slightlyvaries as a function of the spectral type for field galaxies. As a consequence,we find evidence for an environmental dependence of the photoz accuracy,interpreted as the standard used Spectral Energy Distributions being not verywell suited to cluster galaxies. Finally, we modeled the LCDCS 0504 mass withthe strong arcs detected along this line of sight.

The DAFT/FADA survey. I.Photometric redshifts along lines of sight to clusters in the z=[0.4,0.9] interval