  We present lattice results for the non-perturbative Collins-Soper (CS)
kernel, which describes the energy-dependence of transverse momentum-dependent
parton distributions (TMDs). The CS kernel is extracted from the ratios of
first Mellin moments of quasi-TMDs evaluated at different nucleon momenta.The
analysis is done with dynamical $N_f=2+1$ clover fermions for the CLS ensemble
H101 ($a=0.0854\,\mathrm{fm}$, $m_{\pi}=m_K=422\,\mathrm{MeV}$). The computed
CS kernel is in good agreement with experimental extractions and previous
lattice studies.
