GLACE survey: OSIRIS/GTC Tuneable Filter H$\alpha$ imaging of the rich
  galaxy cluster ZwCl 0024.0+1652 at z = 0.395. Part I -- Survey presentation,
  TF data reduction techniques and catalogue
  The cores of clusters at 0 $\lesssim$ z $\lesssim$ 1 are dominated by
quiescent early-type galaxies, whereas the field is dominated by star-forming
late-type ones. Galaxy properties, notably the star formation (SF) ability, are
altered as they fall into overdense regions. The critical issues to understand
this evolution are how the truncation of SF is connected to the morphological
transformation and the responsible physical mechanism. The GaLAxy Cluster
Evolution Survey (GLACE) is conducting a study on the variation of galaxy
properties (SF, AGN, morphology) as a function of environment in a
representative sample of clusters. A deep survey of emission line galaxies
(ELG) is being performed, mapping a set of optical lines ([OII], [OIII],
H$\beta$ and H$\alpha$/[NII]) in several clusters at z $\sim$ 0.40, 0.63 and
0.86. Using the Tunable Filters (TF) of OSIRIS/GTC, GLACE applies the technique
of TF tomography: for each line, a set of images at different wavelengths are
taken through the TF, to cover a rest frame velocity range of several thousands
km/s. The first GLACE results target the H$\alpha$/[NII] lines in the cluster
ZwCl 0024.0+1652 at z = 0.395 covering $\sim$ 2 $\times$ r$_{vir}$. We discuss
the techniques devised to process the TF tomography observations to generate
the catalogue of H$\alpha$ emitters of 174 unique cluster sources down to a SFR
below 1 M$_{\odot}$/yr. The AGN population is discriminated using different
diagnostics and found to be $\sim$ 37% of the ELG population. The median SFR is
1.4 M$_{\odot}$/yr. We have studied the spatial distribution of ELG, confirming
the existence of two components in the redshift space. Finally, we have
exploited the outstanding spectral resolution of the TF to estimate the cluster
mass from ELG dynamics, finding M$_{200}$ = 4.1 $\times$ 10$^{14}$ M$_{\odot}
h^{-1}$, in agreement with previous weak-lensing estimates.
