Patent Number: 
Section: claims

1. A charged particle beam application apparatus comprising,a stage for moving a specimen, anda specimen holding device arranged on the stage,wherein the specimen holding device including an electrostatic chuck capable of holding thereon at least a first specimen of first specimen size and a second specimen of second specimen size greater than the first specimen size, and a top table including an opening in which the electrostatic chuck is arranged,the top table has an outer peripheral portion including a side wall extending to surround an outer periphery of the second specimen held by the electrostatic chuck, and a reference planar portion arranged at an upper end of the side wall, andthe electrostatic chuck is capable of holding thereon a dummy specimen together with the first specimen. 2. The charged particle beam application apparatus according to claim 1, wherein the electrostatic chuck is capable of holding thereon the dummy specimen between an outer periphery of the first specimen and the side wall. 3. The charged particle beam application apparatus according to claim 1, wherein a size of the electrostatic chuck is greater than the first specimen size and smaller than the second specimen size. 4. The charged particle beam application apparatus according to claim 1, wherein the reference planar portion and a surface of the second specimen form a substantially common height. 5. A charged particle beam application apparatus comprising,a stage for moving a specimen, anda specimen holding device arranged on the stage,wherein the specimen holding device including an electrostatic chuck capable of holding thereon at least a first specimen of first specimen size and a second specimen of second specimen size greater than the first specimen size, and a top table including an opening in which the electrostatic chuck is arranged,the top table has an outer peripheral portion including a side wall extending to surround an outer periphery of the second specimen held by the electrostatic chuck, and a reference planar portion arranged at an upper end of the side wall,the electrostatic chuck is capable of holding thereon both of the first specimen and a dummy specimen arranged between an outer periphery of the first specimen and the side wall,an inner diameter of the dummy specimen is greater than an outer diameter of the first specimen size, and an outer diameter of the dummy specimen is greater than an outer diameter of the electrostatic chuck and smaller than an outer diameter of the opening. 6. The charged particle beam application apparatus according to claim 5, wherein a thickness of the dummy specimen is substantially equal to a thickness of one of the first and second specimen. 7. The charged particle beam application apparatus according to claim 5, wherein a material of the dummy specimen is equal to that of one of the first and second specimen. 8. The charged particle beam application apparatus according to claim 5, wherein the dummy specimen is electrically earthed to be prevented from being electrically charged. 9. The charged particle beam application apparatus according to claim 5, wherein the dummy specimen has a predetermined pattern. 10. A charged particle beam application apparatus comprising,a stage for moving a specimen,a specimen holding device arranged on the stage, anda specimen chamber arranged to surround the stage,wherein the specimen holding device including an electrostatic chuck capable of holding thereon at least a first specimen of first specimen size and a second specimen of second specimen size greater than the first specimen size, and a top table including an opening in which the electrostatic chuck is arranged, andthe electrostatic chuck is capable of holding thereon a dummy specimen together with the first specimen. 11. The charged particle beam application apparatus according to claim 10, further comprising a transfer mechanism for transferring onto and from the stage the dummy specimen and one of the first and second specimens independently of each other. 12. The charged particle beam application apparatus according to claim 10, wherein the electrostatic chuck has one of a groove and non-attractive region which one communicates with a gap between an outer periphery of the first specimen and the dummy specimen. 13. The charged particle beam application apparatus according to claim 10, further comprising a positioning device for positioning on the stage the dummy specimen and one of the first and second specimens. 14. The charged particle beam application apparatus according to claim 10, further comprising a stocker arranged adjacently to the specimen chamber to contain therein at least one of the dummy specimen, and a transfer device for selecting the dummy specimen in accordance with a size and material of the specimen to be treated.