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Method and apparatus for aligning a charged particle beam

阅读:868发布:2022-12-19

专利汇可以提供Method and apparatus for aligning a charged particle beam专利检索,专利查询,专利分析的服务。并且There is disclosed apparatus for mining and excavating through rocky terrain without a mechanical tool or machine which must be made rugged enough to withstand the forces and impacts necessary to break rocks. The excavation is carried out with an electron beam which is projected against the rock. The beam is conducted from a generator through a long tube, which may be 20 feet long or more through one or more internal apertures, and is emitted at the end of the tube through an exit aperture. The generator and tube may be mounted on the turret of a vehicle so that the tube can swing in an arc of large angle in the plane of a rocky seam or at any angle transverse to this plane. The beam is centered in, at least, the exit aperture by apparatus which responds to any uneven generation of X-Rays around the periphery of the exit aperture.,下面是Method and apparatus for aligning a charged particle beam专利的具体信息内容。

1. Apparatus for aligning a beam of charged particles with a section of an elongated passageway provided with a transverse wall having a beam aperture through which said beam passes, said wall being effective to emit X-rays when impinged by said charged particles, said beam alignment apparatus comprising: a set of Xray detectors with collimators, said collimators being so aligned as to pass X-rays only if they come from certain portions of said wall with which said collimators are aligned, and signal processing means which compares the signals from the various Xray detectors to ascertain which edge portion of the beam aperture is impinged by an excessive amount of said charged particles and therefore emitting an excessive amount of X-rays, and beam deflecting means responding to said signal processing means so as to equalize the signal strength received by all of said X-ray detectors thereby to align said beam in said aperture.
2. Beam alignment apparatus according to claim 1 including means for determining the total X-ray intensity received from all of said X-ray detectors, and beam focusing means responsive to the total X-ray intensity so as to minimize the total X-ray intensity thereby passing the greatest part of said beam through said beam aperture.
3. The method of realigning a beam of charged particles said beam being produced by a beam generator having an elongated hollow structure provided with a transverse wall having an aperture therethrough, said wall adjacent said aperture being effective to emit X-rays when impinged by said charged particles, said beam generally being aligned to pass longitudinally through said structure, the said method comprising controlling the path of said beam of charged particles through said aperture by sensing the X-rays emitted from said wall when said charged particles impinge on selected portions of said wall and adjusting the path of said beam of charged particles to minimize the magnitude of said X-rays thereby centering said beam of charged particles in said aperture.
4. A charged particle beam generator comprising a body member having an evacuated chamber and a passageway leading from said chamber outwardly of said body member, means in said chamber generating and projecting a beam of charged particles through said passageway, a chamber wall member in said passageway, said wall member being provided with first and second wall surfaces spaced longitudinally along the path of said beam of particles, said wall member having an aperture extending between and opening outwardly of said first and second wall surfaces, said first wall surface being on the side of said wall member toward said generating means and effective to emit X-rays as a consequence of the impingement thereon of said charged particles, beam adjusting means adjacent said beam of particles and actuatable to alter the path of said beam of particles, X-ray responsive means, X-ray selecting means selectively transmitting certain of said X-rays produced by a first portion of said first wall surface to said X-ray responsive means and preventing transmission of X-rays produced by other portions of said first wall surface from reaching said X-ray responsive means, and control means operatively connecting said X-ray responsive means with said beam adjusting means, said control means being effective actuate said beam adjusting means to alter the path of said beam of particles in a direction to minimize the magnitude of said X-rays which are received by said X-ray responsive means.
5. The combination of claim 4 including a plurality of said X-ray responsive means and a plurality of said X-ray selecting means individually associated with said X-ray responsive means, said X-ray selecting means selectively transmitting certain of said X-rays produced by individual portions of said first wall surface, said X-ray responsive means being coupled to said control means, said control means being effective to actuate said beam adjusting means in response to a change in the magnitude of the X-rays produced by said individual portions of said first wall surface to alter the path of said beam of particles to minimize the magnitude of X-rays received from said individual portions of said first wall and thereby center the path of said beam of particles in said aperture.
6. The combination of claim 4 in which said beam adjusting means alters the path of said beam by changing the direction of said path of said beam relative to said aperture.
7. The combination of claim 4 in which said beam adjusting means alters the path of said beam by focussing said beam of charged particles relative to said aperture.
8. The combination of claim 4 in which said beam adjusting means alters the path of said beam by focussing and changing the direction of said beam to minimize the total magnitude of said charged particles which impinge on said individual portions of said first wall.
9. The combination of claim 4 in which said X-ray selecting means is a collimator located in said passageway adjacent said first wall surface, said collimator having a passageway therethrough and positioned between said first portion of said first wall surface and said X-ray responsive means.
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