A crucible assembly (14, 80) for physical vapor deposition on a surface comprising: - a base (22, 84) to support and drive in rotation a crucible (18, 82) around a rotational axis, the base comprising a base upper surface (34, 88) having a first alignment relief (30, 90), - a crucible (18, 82) comprising: • at least one cavity (24, 83) for receiving a material to be vaporized by an electron beam gun on the surface, the at least one cavity (24, 83) being disposed at a peripheral area (38, 95) of the crucible (18, 82) with regard to the rotational axis, • a crucible bottom surface (25, 86) intended to contact the base upper surface (34, 88) of the base (22, 84), the crucible bottom surface (25, 86) having a second alignment relief (32, 92) which is complementary shaped with regard to the first alignment relief (30, 90) so as to align both the base (22, 84) and the crucible (18, 82) with regard to the rotational axis when the crucible bottom surface (25, 86) contacts the base upper surface (34, 88) and the first (30, 90) and second (32, 92) alignment reliefs are brought one into the other, the second (32, 92) alignment relief being disposed at a central area (36, 94) of the crucible (18, 82) with regard to the rotation axis. - a base (22, 84) to support and drive in rotation a crucible (18, 82) around a rotational axis, the base comprising a base upper surface (34, 88) having a first alignment relief (30, 90), - a crucible (18, 82) comprising: • at least one cavity (24, 83) for receiving a material to be vaporized by an electron beam gun on the surface, the at least one cavity (24, 83) being disposed at a peripheral area (38, 95) of the crucible (18, 82) with regard to the rotational axis, • a crucible bottom surface (25, 86) intended to contact the base upper surface (34, 88) of the base (22, 84), the crucible bottom surface (25, 86) having a second alignment relief (32, 92) which is complementary shaped with regard to the first alignment relief (30, 90) so as to align both the base (22, 84) and the crucible (18, 82) with regard to the rotational axis when the crucible bottom surface (25, 86) contacts the base upper surface (34, 88) and the first (30, 90) and second (32, 92) alignment reliefs are brought one into the other, the second (32, 92) alignment relief being disposed at a central area (36, 94) of the crucible (18, 82) with regard to the rotation axis. • at least one cavity (24, 83) for receiving a material to be vaporized by an electron beam gun on the surface, the at least one cavity (24, 83) being disposed at a peripheral area (38, 95) of the crucible (18, 82) with regard to the rotational axis, • a crucible bottom surface (25, 86) intended to contact the base upper surface (34, 88) of the base (22, 84), the crucible bottom surface (25, 86) having a second alignment relief (32, 92) which is complementary shaped with regard to the first alignment relief (30, 90) so as to align both the base (22, 84) and the crucible (18, 82) with regard to the rotational axis when the crucible bottom surface (25, 86) contacts the base upper surface (34, 88) and the first (30, 90) and second (32, 92) alignment reliefs are brought one into the other, the second (32, 92) alignment relief being disposed at a central area (36, 94) of the crucible (18, 82) with regard to the rotation axis.