To provide an emitter for a charged particle beam apparatus.

The emitter is provided with a filament (3) fixed to and extended between a first and a second support parts (2), an emitter tip part (4)mounted on the filament (3) and a stabilizing element (6) mounted on a third support part (5) and the filament (3). The first, second and third support parts (2, 5) define a triangle, and as a result, the stabilizing element (6) will be extended at least partially in the direction of crossing an extension direction of the filament at right angles.