US3902097A - Deflector horn for high-intensity electron beams - Google Patents

Deflector horn for high-intensity electron beams Download PDF

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Publication number
US3902097A
US3902097A US391055A US39105573A US3902097A US 3902097 A US3902097 A US 3902097A US 391055 A US391055 A US 391055A US 39105573 A US39105573 A US 39105573A US 3902097 A US3902097 A US 3902097A
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US
United States
Prior art keywords
electron
horn
outlet window
deflector
vacuum chamber
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
US391055A
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English (en)
Inventor
Bernd-Peter Offermann
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19722241552 external-priority patent/DE2241552C3/de
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Application granted granted Critical
Publication of US3902097A publication Critical patent/US3902097A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING 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
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K5/00—Irradiation devices
    • G21K5/10—Irradiation devices with provision for relative movement of beam source and object to be irradiated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
    • H01J5/18—Windows permeable to X-rays, gamma-rays, or particles

Definitions

  • 1 72 rm ny 2241552 vacuum chamber and an electron source includes a 1973 Gcfmlmy 7231279 conical outcr body portion and a conical inner body portion and an electron outlet window of annular cirl l 313/477 cular configuration which separates the vacuum chaml l j j j 29/86 her from the ambient atmosphere.
  • the circular elecl l Field of Search 250/398 tron outlet window is affixed to the conical body portions by a securing mechanism which has no parts that [56] Referenc S Ci e extend into the window area.
  • This invention relates to an electron deflector horn designed for high-intensity electron beams used for radiation purposes and is of the type which is associated with an electron source, an electron accelerator and an electron deflection system which deflects the electrons by means of magnetic and/or electric fields towards an electron outlet window that separates the vacuum chamber of the electron accelerator from the ambient atmosphere.
  • Electron deflector horns have been known which have an electron outlet window of rectangular or linear shape. In order to insure that the minimum amount of energy of the exiting electrons is absorbed by the window itself, the latter should be as thin and should have an as large a surface as possible.
  • the design of such a window is primarily dependent upon the properties, particularly the tensional strength of the material of which the window structure is made. For such purposes most often thin sheets (foils) of light metal are used.
  • Electron outlet windows of known structure often include usually water-cooled auxiliary webs which, as window frames, serve for supporting the window foils.
  • a window structure designed in this manner and used in an electron deflector horn is, however, disadvantageous since the webs absorb one part of the electron energy and thus adversely affect the electron-pervious properties of the window.
  • the electron outlet window is of circular configuration and is affixed to the electron deflector horn without auxiliary webs.
  • the electrons which pass through the electron outlet window are not absorbed by auxiliary webs but may be used entirely for radiation purposes.
  • a window of annular circular surface corresponding to the ratio of perimeter to diameter.
  • a window area which is 3.14 times larger. Consequently, the intensity of the electron beam which passes through the window is also 3.14 times greater than in prior art windows of linear configuration.
  • a further advantage is, in addition to the compact and sturdy structure, the possibility of using relatively simple deflection means for the elec tron deflection system.
  • FIG. 1 is a schematic side elevational view of a preferred embodiment of the invention.
  • FIG. 2 is a plan view of the same embodiment taken in the direction of arrows A-A of FIG. 1.
  • FIG. 1 there is shown an electron deflector horn which has a conical inner body portion 1 disposed in a conical outer body portion 2 in such a manner that between the two portions 1 and 2 there is defined an intermediate vacuum chamber 3, having the configuration of a conical or frustoconical shell.
  • the components 1 and 2 as it may be observed from FIG. 2, are connected to one another by means of watercooled webs 11 which bridge the vacuum chamber 3.
  • These webs do not serve as a support for the electron outlet window but function merely as a mechanical connection between the inner and outer portions 1 and 2.
  • the webs 11 can be constructed like hollow bodies.
  • conventional pumps and pipe-lines can be used. It is expedient to connect two webs II with a pipe-line inside the cone of the inner body portion 1.
  • the pipe couplings for the webs II can be arranged outside the electron deflector horn. It is, however, also possible to immobilize the two conical portions 1 and 2 with respect to one another and to obtain the intermediate spaee 3 without such webs.
  • the intermediate vacuum chamber 3 is, at the feet of the conical portions 1 and 2, bounded by an electron outlet window 4 which is formed of a foil separating the intermediate vacuum chamber 3 from the external ambient atmospheric pressure.
  • the window 4 has an effective area of circular annular shape.
  • the window 4 may be made of titanium alloys or aluminum alloys.
  • the outlet window is affixed by means of two concentric rings 5 and 6 and by means of screws to concentric flanges 7 and 8 which, in turn, are fixedly attached to the conical portions 2 and 1, respectively.
  • the flange 7 and the ring 5 bound the window 4 along its outer circumference
  • the flange 8 and the ring 6 bound the window 4 along its inner circumference.
  • the flanges and rings clamp the window 4 along portions externally of its effective area.
  • the rings 5 and 6 may be made of metal, such as an aluminum alloy.
  • the intermediate vacuum chamber 3 is in communication with the inner chamber of an electron deflection system 9 which is connected after an electron generator and electron accelerator 10.
  • the electric and magnetic electron generating, accelerating and deflecting means are not illustrated in detail.
  • the electrons accelerated by the accelerator enter the deflection system 9 in which the electrons are deflected with the aid. of magnetic and/or electric fields.
  • the deflected electrons pass through the intermediate vacuum chamber 3, penetrate the electron outlet window 4 and impinge upon the object to be irradiated.
  • Relatively simple deflection means can be used for the electron deflection system.
  • a deflection system in which the electrons are deflected with the aid of magnetic and/or electric fields is described in German Auglegeschrift (examined patent application published for opposition) No. 1,098,630, corresponding to US. Pat. No. 2,977,500.
  • An electron deflector horn for high-intensity electron beams having an electron source; an electron deflector; an electron accelerator; a horn body extending away from the electron source and defining a vacuum chamber for providing a path for the electrons emitted by the electron source and accelerated by the electron accelerator; an electron outlet window at an end of the vacuum chamber remote from the electron source, the electron outlet window separating the vacuum chamber from the ambient atmosphere; comprising in combination:

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Particle Accelerators (AREA)
  • Electron Sources, Ion Sources (AREA)
US391055A 1972-08-24 1973-08-24 Deflector horn for high-intensity electron beams Expired - Lifetime US3902097A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722241552 DE2241552C3 (de) 1972-08-24 Für Bestrahlungszwecke mit hohen Elektronenstrahlleistungen ausgebildete Elektronenstrahlröhre

Publications (1)

Publication Number Publication Date
US3902097A true US3902097A (en) 1975-08-26

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Application Number Title Priority Date Filing Date
US391055A Expired - Lifetime US3902097A (en) 1972-08-24 1973-08-24 Deflector horn for high-intensity electron beams

Country Status (4)

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US (1) US3902097A (member.php)
CH (1) CH552280A (member.php)
FR (1) FR2197225B1 (member.php)
GB (1) GB1429058A (member.php)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494036A (en) * 1982-11-22 1985-01-15 Hewlett-Packard Company Electron beam window
US5401973A (en) * 1992-12-04 1995-03-28 Atomic Energy Of Canada Limited Industrial material processing electron linear accelerator
US20080067406A1 (en) * 2006-07-17 2008-03-20 Yaohong Liu Irradiating device and method for controlling the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959700A (en) * 1958-11-24 1960-11-08 Shell Oil Co Particle accelerator
US3486060A (en) * 1967-09-06 1969-12-23 High Voltage Engineering Corp Cooling apparatus with laminar flow for electron permeable windows

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2959700A (en) * 1958-11-24 1960-11-08 Shell Oil Co Particle accelerator
US3486060A (en) * 1967-09-06 1969-12-23 High Voltage Engineering Corp Cooling apparatus with laminar flow for electron permeable windows

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494036A (en) * 1982-11-22 1985-01-15 Hewlett-Packard Company Electron beam window
US5401973A (en) * 1992-12-04 1995-03-28 Atomic Energy Of Canada Limited Industrial material processing electron linear accelerator
US20080067406A1 (en) * 2006-07-17 2008-03-20 Yaohong Liu Irradiating device and method for controlling the same
US7696488B2 (en) * 2006-07-17 2010-04-13 Nuctech Company Limited Irradiating device and method for controlling the same
DE102007033052B4 (de) 2006-07-17 2018-04-26 Nuctech Co. Ltd. Bestrahlungsvorrichtung und Verfahren zur Steuerung/Regelung derselben

Also Published As

Publication number Publication date
CH552280A (de) 1974-07-31
FR2197225B1 (member.php) 1978-10-27
GB1429058A (en) 1976-03-24
DE2241552A1 (de) 1974-03-21
FR2197225A1 (member.php) 1974-03-22
DE2241552B2 (de) 1977-06-23

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