evenly distribute hair children

I want to hair children to be evenly distributed.
In the left image, blender grows children randomly.
But I want it to be like the right image.
Is it possible?

Try increasing the Roundness setting under Effects. AFAIK you can’t adjust the radial distribution of the children around the parent strand, but Roundness lets you reshape the pattern from which they emerge near the root.

I need to distribute the children evenly.
But roundness makes it better.
Thank you for your help.