P oS(LATTICE2014)048 Conjugate Directions in Lattice Landau and Coulomb Gauge Fixing

We provide details expanding on our implementation of a non-linear conjugate gradient method for Landau and Coulomb gauge fixing with Fourier acceleration. We find clear improvement over the Fourier accelerated steepest descent method, with the average time taken for the algorithm to converge to a fixed, high accuracy, being reduced by a factor of 2 to 4. We show such improvement to be the case for the logarithmic definition of the gauge fields, having already shown this to be the case for a more common definition. We also discuss the implementation of an optimal Fourier accelerated steepest descent method