  We perform a systematic study of Andreev conversion at the interface between
a superconductor and graphene in the quantum Hall (QH) regime. We find that the
probability of Andreev conversion from electrons to holes follows an unexpected
but clear trend: the dependencies on temperature and magnetic field are nearly
decoupled. We discuss these trends and the role of the superconducting
vortices, whose normal cores could both absorb and dephase the individual
electrons in a QH edge. Our study may pave the road to engineering future
generation of hybrid devices for exploiting superconductivity proximity in
chiral channels.
