US3538468A - Flexible device for deflecting charged particles - Google Patents

Flexible device for deflecting charged particles Download PDF

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Publication number
US3538468A
US3538468A US815617A US3538468DA US3538468A US 3538468 A US3538468 A US 3538468A US 815617 A US815617 A US 815617A US 3538468D A US3538468D A US 3538468DA US 3538468 A US3538468 A US 3538468A
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US
United States
Prior art keywords
charged particles
section
electromagnets
conduit
flexible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US815617A
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English (en)
Inventor
Hyota Fujita
Kazuhiro Ueda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
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Publication of US3538468A publication Critical patent/US3538468A/en
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/08—Deviation, concentration or focusing of the beam by electric or magnetic means
    • G21K1/093—Deviation, concentration or focusing of the beam by electric or magnetic means by magnetic means

Definitions

  • a flexible beam conduit extends centrally through several juxtaposed ring-shaped magnets having opposed main faces tilted toward each other with ball bearing type supports interposed between the magnets.
  • One pair of opposed non-magnetic retainers are fixed respectively to pole pieces of each magnet to sandwich the conduit between them to maintain its predetermined position relative to the pole pieces.
  • Selected ones of the magnets are suitably rotated with respect to the adjacent magnets to curve the conduit into any desired curvature while establishing a field for moving a beam of charged particles along the curved axis of the conduit.
  • This invention relates to a device for deflecting a beam of charged particles.
  • deflection devices comprise a section of beam conduit curved into a predetermined curvature to guide a beam of charged particles within the same, and an electromagnet having a geometry conformed to the predetermined curvature and encircling one portion of the curved section to deflect the beam of charged particles only along the longitudinal axis of the curved section of conduit.
  • electromagnet having a geometry conformed to the predetermined curvature and encircling one portion of the curved section to deflect the beam of charged particles only along the longitudinal axis of the curved section of conduit.
  • Those devices are satisfactory for applications where the beam of charged particles are to be deflected along a predetermined fixed curvature.
  • the invention accomplishes this and other objects by the provision of a flexible device for deflecting a beam of charged particles comprising a section of beam guide conduit and annular magnet means encircling at least one portion of the section of beam conduit.
  • the device is characterized in that the section of beam conduit is flexible, that the magnet means includes a plurality of annular magnets disposed in juxtaposed relationship, each of the magnets having a pair of opposite main faces tilted toward each other, and imparting a deflection of one unit to the beam of charged particles, and that one supporting member is interposed between each pair of adjacent magnets to hold those magnets such that the magnets are independently rotatable.
  • Each magnet may be of electromagnetic or permanent type, and retaining means for each magnet may be preferably provided for maintaining the associated portion of the section of flexible beam conduit in its predetermined position with respect to the magnetic poles of the magnet.
  • FIG. 1 is a plan view, partly in section of a device for deflecting a beam of charged particles, arranged and operated in accordance with the principles of the prior art;
  • FIG. 2 is a diagrammatic plan view, partly in section of a device for deflecting a beam of charged particles, arranged and operated in accordance with the principles of the invention with the section taken along the line II-lI of FIG. 4;
  • FIG. 3 is a view similar to FIG. 2 illustrating the device of FIG. 2 in its curved state
  • FIG. 4 is an enlarged cross sectional view of the device shown in FIGS. 2 and 3 with parts illustrated in elevation;
  • FIG. 5 is an enlarged fragmental sectional view of a supporting member which may be used in the invention.
  • a section 10 of beam conduit is curved into a predetermined fixed curvature to guide a beam of charged particles (not shown) along the curved longitudinal axis of the section.
  • An annular electromagnet 12 having its geometry conformed to the predetermined fixed curvature encloses the section of conduit 10 to establish a magnetic field for deflecting the beam of charged particles within the section 12 and only along the curved axis thereof in the well-known manner.
  • a device illustrated permits the beam of charged particles to be deflected only with a predetermined fixed curvature corresponding to the curvature of the section of conduit.
  • the invention contemplates to eliminate the abovementioned inconvenience.
  • FIG. 2 there is illustrated a deflection device constructed in accordance with the principles of the invention.
  • the arrangement illustrated comprises a section 20 of flexible beam conduit which may be for example in the form of a bellows, and a'plurality of annular electromagnets 22 disposed in juxtaposed relationship and encircling the substantial portion of the flexible section 20.
  • Each of the electromagnets 22 has a pair of opposite main faces tilted toward each other to form a convergent angle of 0 therebetween and adjoins the succeeding electromagnet through a supporting member interposed therebetween.
  • the supporting member is schematically designated by the reference numeral 24 and functions to hold the associated electromagnets 22 in place while permitting the electromagnets to be independently rotated.
  • the supporting member may be preferably of a ball bearing type such as described hereinafter in conjunction with FIG. 5.
  • the electromagnets 22 are shown as being placed in line such that the smaller ends of their cross sections alternate with the larger ends thereof whereby the common axis substantially lies on the longitudinal section 20 of beam conduit.
  • One exciting winding 28 is disposed around each of the pole pieces 26 of the electromagnet 22 for exciting the latter.
  • a pair of retaining members 30 of any suitable non-magnetic material such as non-magnetic stainless steel, copper or the like are suitably fixed in opposite relationship at both ends to the opposite pole pieces 26 of each electromagnet 22 and have the intermediate portions complementary in shape to the section 20 of beam conduit to sandwich the latter therebetween. This measure ensures that the opposite pole pieces have the adjacent portion of the section 20 maintained in its predetermined position with respect thereto.
  • the retaining members 30 serves to prevent the flexible section 20 of beam conduit from escaping from the electromagnets 22.
  • each of the electromagnets 22 can be rotated through any desired angle and independently of the other electromagnets and positioned in the rotated position by means of the associated supporting members 24.
  • the device can be readily changed from its position where they are placed in line and the section 20 of flexible conduit is maintained substantially straight as shown in FIG. 2 to its position where the electromagnets are placed in curved line into which the section is also curved as a result of the angular displacement of the electromagnets.
  • the physical separation of the section from the electromagnets permits the former to be curved into the desired configuration without compulsion while at the same time the retaining members 30 ensures that any portion of the section 20 of flexible conduit is prevented from occupying its position offset from the asciated electromagnet 20-.
  • each of the electromagnets 22 is operated to deflect a beam of charged particles by one unit as previously described, the electromagnets in their positions as illustrated in FIG. 3 successively deflect a beam of charged particles travelling within the curved section 20 in incremental manner until the beam leaves the section.
  • the arrangement of FIG. 3 can deflect the beam of charged particles through the total angle of 119 which is a maximum angle of deflection obtainable by the same.
  • the present device can be inexpensively constructed.
  • selected ones of the electromagnets 22 can be rotated with respect to the adjacent electromagnets to curve the section 20 of flexible conduit through any desired angle not only two-dimensional but also three-dimensional within a maximum possible angle such as the angle of mi in the previous case with the result that the particular beam of charged particles are deflected within the section thus curved and along the longitudinal axis thereof.
  • FIG. shows one form of the supporting member 24.
  • the supporting member 24 is of a ball bearing type and includes an outer race 32 fixedly secured to the outer peripheral portion of one of two adjacent electromagnets 22 an inner race 34 fixedly secured to the other electro magnet 22 and a plurality of balls 36 arranged for example in two rows with an annular partition 38 projecting from the outer race 32 to separate two ball rows from each other.
  • the invention is applicable to the deflection of beams of charged particles generated by various means.
  • the invention can be effectively used in irradiating a subject by a particle accelerator.
  • the beam of charged particles from the accelerator is possible to irradiate a body to be irradiated in every possible direction without the necessity of moving the accelerator.
  • the accelerator is operatively associated with a section of any suitable straight tube for guiding the beam of charged particles from the accelerator then that beam is allowed to be conveyed from that chamber having the accelerator disposed therein to another chamber.
  • any suitable permanent magnets, any suitable electromagnetic deflection coils or any suitable electrostatic deflection means may be equally used in place of the illustrated electromagnets 22.
  • the unit deflection electromagnets 22 need not have a common convergent angle, and any suitable combination of electromagnets 22 and/ or the equivalent having suitable different convergent angles are possible.
  • a flexible device for deflecting a beam of charged particles comprising a section of flexible beam conduit for guiding a beam of charged particles therewithin, a plurality of annular magnets disposed in juxtaposed relationship and each encircling a respective axial portion of said section of flexible beam conduit, each of said magnets having a pair of opposite main faces tilted toward each other for imparting a deflection to the beam of charged particles, and supporting members interposed respectively between adjacent magnets, said supporting members including means for rotatably joining adjacent magnets.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Particle Accelerators (AREA)
  • Radiation-Therapy Devices (AREA)
US815617A 1968-04-16 1969-04-14 Flexible device for deflecting charged particles Expired - Lifetime US3538468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2540168 1968-04-16

Publications (1)

Publication Number Publication Date
US3538468A true US3538468A (en) 1970-11-03

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Application Number Title Priority Date Filing Date
US815617A Expired - Lifetime US3538468A (en) 1968-04-16 1969-04-14 Flexible device for deflecting charged particles

Country Status (5)

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US (1) US3538468A (de)
CH (1) CH488372A (de)
DE (1) DE1919097A1 (de)
FR (1) FR2006281A1 (de)
GB (1) GB1223215A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11140775B2 (en) * 2015-09-30 2021-10-05 Semiconductor Energy Laboratory Co., Ltd. Circuit board and display system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS601809A (ja) * 1983-06-18 1985-01-08 Mitsubishi Electric Corp トロイダルコイル装置
DE3734423C1 (de) * 1987-10-12 1989-02-16 Kernforschungsanlage Juelich Vorrichtung zur Reflexion niederenergetischer Ionen
GB2296372A (en) * 1994-12-23 1996-06-26 Atomic Energy Authority Uk Bending accelerated charged particle beams

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379911A (en) * 1965-06-11 1968-04-23 High Voltage Engineering Corp Particle accelerator provided with an adjustable 270deg. non-dispersive magnetic charged-particle beam bender
US3465142A (en) * 1966-08-10 1969-09-02 Ass Elect Ind Mass spectrometer magnetic analyzer having pole pieces composed of spaced paramagnetic laminae

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379911A (en) * 1965-06-11 1968-04-23 High Voltage Engineering Corp Particle accelerator provided with an adjustable 270deg. non-dispersive magnetic charged-particle beam bender
US3465142A (en) * 1966-08-10 1969-09-02 Ass Elect Ind Mass spectrometer magnetic analyzer having pole pieces composed of spaced paramagnetic laminae

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11140775B2 (en) * 2015-09-30 2021-10-05 Semiconductor Energy Laboratory Co., Ltd. Circuit board and display system

Also Published As

Publication number Publication date
FR2006281A1 (de) 1969-12-26
CH488372A (de) 1970-03-31
DE1919097B2 (de) 1971-01-14
DE1919097A1 (de) 1969-10-23
GB1223215A (en) 1971-02-24

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