Search for R-modes from known Pulsar.

\textbf{gravitational waves are~ weak in signal but it can beat the spin down limits if observed for a longer time span. R-modes are the current quadruple oscillation of fluid in neutron star, which emits gravitational waves in 4/3 times the spin frequency in Newtonian case. We present here the first search of R-mode gravitational waves from known pulsar from a LIGO O1~ {\&} O2 run using the F-statistic method. We didn't find gravitational waves but set up a 95{\%} upper limit on amplitude strain.}