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ArTeMiS is a wide-field submillimeter camera operating at three wavelengthssimultaneously (200, 350 and 450 microns). A preliminary version of theinstrument equipped with the 350 microns focal plane, has been successfullyinstalled and tested on APEX telescope in Chile during the 2013 and 2014austral winters. This instrument is developed by CEA (Saclay and Grenoble,France), IAS (France) and University of Manchester (UK) in collaboration withESO. We introduce the mechanical and optical design, as well as the cryogenicsand electronics of the ArTeMiS camera. ArTeMiS detectors are similar to theones developed for the Herschel PACS photometer but they are adapted to thehigh optical load encountered at APEX site. Ultimately, ArTeMiS will contain 4sub-arrays at 200 microns and 2x8 sub-arrays at 350 and 450 microns. We showpreliminary lab measurements like the responsivity of the instrument to hot andcold loads illumination and NEP calculation. Details on the on-skycommissioning runs made in 2013 and 2014 at APEX are shown. We used planets(Mars, Saturn, Uranus) to determine the flat-field and to get the fluxcalibration. A pointing model was established in the first days of the runs.The average relative pointing accuracy is 3 arcsec. The beam at 350 microns hasbeen estimated to be 8.5 arcsec, which is in good agreement with the beam ofthe 12 m APEX dish. Several observing modes have been tested, like On-The-Flyfor beam-maps or large maps, spirals or raster of spirals for compact sources.With this preliminary version of ArTeMiS, we concluded that the mapping speedis already more than 5 times better than the previous 350 microns instrument atAPEX. The median NEFD at 350 microns is 600 mJy.s1/2, with best values at 300mJy.s1/2. The complete instrument with 5760 pixels and optimized settings willbe installed during the first half of 2015.

The ArT\'eMiS wide-field submillimeter camera: preliminary on-sky performances at 350 microns