How to move sphere in spiral through wrangle or point vop

[Hussein]

wondering how to make a sphere move in spiral way in X,Z axis only , either starting form the middle and expanding outside or vice versa, so i can emit from it flip simulation 

[konstantin magnus]

float t = chf("Speed") * @Time;
float s = chf('Spread') * @Time;
@P += set(sin(t) * s, 0, cos(t) * s);