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A finite size effect in the probing of the harmonic measure in simulation ofdiffusion-limited aggregation (DLA) growth is investigated. We introduce avariable size of probe particles, to estimate harmonic measure and extract thefractal dimension of DLA clusters taking two limits, of vanishingly small probeparticle size and of infinitely large size of a DLA cluster. We generate 1000DLA clusters consisting of 50 million particles each, using an off-latticekilling-free algorithm developed in the early work. The introduced method leadsto unprecedented accuracy in the estimation of the fractal dimension. Wediscuss the variation of the probability distribution function with the size ofprobing particles.

Finite size effect of harmonic measure estimation in a DLA model: Variable size of probe particles