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The thermal Sunyaev-Zeldovich effect (tSZ) is a powerful probe to studyclusters of galaxies and is complementary with respect to X-ray, lensing oroptical observations. Previous arcmin resolution tSZ observations ({\it e.g.}SPT, ACT and Planck) only enabled detailed studies of the intra-cluster mediummorphology for low redshift clusters ($z < 0.2$). Thus, the development ofprecision cosmology with clusters requires high angular resolution observationsto extend the understanding of galaxy cluster towards high redshift. NIKA2 is awide-field (6.5 arcmin field of view) dual-band camera, operated at $100 \ {\rmmK}$ and containing $\sim 3300$ KID (Kinetic Inductance Detectors), designed toobserve the millimeter sky at 150 and 260 GHz, with an angular resolution of 18and 12 arcsec respectively. The NIKA2 camera has been installed on the IRAM30-m telescope (Pico Veleta, Spain) in September 2015. The NIKA2 tSZobservation program will allow us to observe a large sample of clusters (50) atredshift ranging between 0.5 and 1. As a pathfinder for NIKA2, several clustersof galaxies have been observed at the IRAM 30-m telescope with the NIKAprototype to cover the various configurations and observation conditionsexpected for NIKA2.

High-resolution tSZ cartography of clusters of galaxies with NIKA at the IRAM 30-m telescope