For each del Pezzo surface $S$ with du Val singularities, we determine whether it admits a $(-K_S)$-polar cylinder or not. If it allows one, then we present an effective $\mathbb{ Q}$-divisor $D$ that is $\mathbb{ Q}$-linearly equivalent to $-K_S$ and such that the open set $S\setminus\mathrm{ Supp}(D)$ is a cylinder. As a corollary, we classify all the del Pezzo surfaces with du Val singularities that admit nontrivial $\mathbb{ G}_a$-actions on their affine cones defined by their anticanonical divisors.
Categories: math.AG