公开(公告)号：US06630666B2

公开(公告)日：2003-10-07

申请号：US09912372

申请日：2001-07-26

Applicant: Roderick G. Greaves

Inventor： Roderick G. Greaves

IPC: G01N2300

CPC classification number: G21K1/003 ,  G01N23/225 ,  H01J3/40 ,  H01J2237/06391 ,  H01J2237/2516 ,  H01J2237/28

Abstract: A positron producing apparatus which includes a vacuum chamber with a source of positrons to be supplied into the vacuum chamber forming a positron cloud within a Penning Trap. The positron cloud is to be compressed producing a thin positron beam which is extracted from the cloud and is smaller in cross-sectional area than the cloud. The positron beam is to be transmitted to a focusing apparatus which transmits the positron beam onto a solid target. The vacuum chamber is to include a cooling gas to be supplied into the vacuum chamber and a compressing device for the positron cloud is to include a rotating electric field. A method for compressing the positron cloud to produce a thin positron beam, which is to be transmitted to a solid for the purpose of analyzing properties of the solid, comprises the steps of supplying a source of positrons within a vacuum environment, forming and containing the positron cloud within a Penning Trap, producing a positron beam, and focusing of that positron beam onto a solid. The method is also to include adding of a cooling gas within the vacuum environment.