How to sow smooth the cone for larger height?

Code from sandcastle

var redCone = viewer.entities.add({
name: “Red cone”,
position: Cesium.Cartesian3.fromDegrees(-100.0, 40.0, 1600000.0),
cylinder: {
length: 3200000.0,
topRadius: 0.0,
bottomRadius: 111678.389448003,
material: Cesium.Color.GREEN.withAlpha(0.5),
slicePartitions:360,
stackPartitions:360,
slices:500,
outline: false,
},
});