minetest particle spawner (spawns but does not move)

gistfile1.txt

100       minetest.add_particle({
101         pos = {x=pos.x, y=pos.y+1, z=pos.z},
102         velocity = {x=10 ,y=2,z=5},
103         acceleration = {x=10,y=-0.5,z=0},
104         expirationtime = 2,
105         size = 1,
106         collisiondetection = true,
107         texture = 'bees_wax.png',
108       })