  The main purpose of the NA62 experiment is to measure the branching ratio of
the (ultra) rare decay $K+ \rightarrow {\pi}+{\nu}\bar{\nu}$ with the precision
of 10% collecting about 100 events with the Standard Model branching fraction
in 3 years of data taking. The commissioning of the experiment after the 2014
pilot run and the prospects for the 2015 run are presented.
