According to the cp2k manual, there is a ALPHA keyword in the Ewald input section (Section path: CP2K_INPUT / FORCE_EVAL / DFT / POISSON / EWALD). I am not 100% sure about the meaning of ALPHA, but my gut feeling is that ALPHA controls the real space part of the Ewald summation. But as I was going through the cp2k code (specifically the qs_ks_build_kohn_sham_matrix subroutine), I did not find the code that handles the real space part of the Ewald summation. It seems to me that all the Ewald summation are included in the k-space summation. The recent JCP(2020) paper on CP2K suggests that too. So is ALPHA an obsolete parameter?
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