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We analyze the stress induced and thermally assisted roughening of a forestof superclimbing dislocations in a Peierls potential in the presence ofHelium-3 impurities and randomly frozen in static stresses. It is shown thatthe temperature of the dip $T_d$ in the flow rate observed by Ray and Hallock(Phys.Rev. Lett. {\bf 105}, 145301 (2010)) is determined by the energy of theimpurity activation from dislocation core. However, it is suppressed by,essentially, the logarithm of the impurity fraction. The width of the dip isdetermined by inhomogeneous fluctuations of the stresses and is shown to bemuch smaller than $T_d$.

The role of Helium-3 impurities in the stress induced roughening of superclimbing dislocations in solid Helium-4