A charged particle beam apparatus with a charged particle beam source including an emitter with an emitter tip and a supporting member for supporting the emitter is provided. The apparatus and methods relate to a protocol that may be referred to as the Persistent Reservation Request, which may be viewed as a type of RR. It is determined whether to recut the sub-voxel corresponding to the projection image, which is on the edge of the silhouette. The second service host receives a reply to the second message from the third service host, where the reply to the second message includes third debug information associated with the third service host, and the second service host generates a reply to the first message.