EP0127512A1 - Beschleunigender, autofokussierender Hohlraum für geladene Teilchen - Google Patents

Beschleunigender, autofokussierender Hohlraum für geladene Teilchen Download PDF

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Publication number
EP0127512A1
EP0127512A1 EP84400968A EP84400968A EP0127512A1 EP 0127512 A1 EP0127512 A1 EP 0127512A1 EP 84400968 A EP84400968 A EP 84400968A EP 84400968 A EP84400968 A EP 84400968A EP 0127512 A1 EP0127512 A1 EP 0127512A1
Authority
EP
European Patent Office
Prior art keywords
longitudinal axis
accelerating cavity
accelerating
charged particles
revolution
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.)
Granted
Application number
EP84400968A
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English (en)
French (fr)
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EP0127512B1 (de
Inventor
Jeanne Aucouturier
Hubert Leboutet
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.)
CGR MEV SA
Original Assignee
CGR MEV SA
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
Application filed by CGR MEV SA filed Critical CGR MEV SA
Publication of EP0127512A1 publication Critical patent/EP0127512A1/de
Application granted granted Critical
Publication of EP0127512B1 publication Critical patent/EP0127512B1/de
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/14—Vacuum chambers
    • H05H7/18—Cavities; Resonators

Definitions

  • the present invention relates to a self-focusing accelerating cavity of charged particles, particularly intended to form the first or single accelerating cavity of a linear accelerator accelerating structure.
  • a correction of this defocusing effect is particularly useful in the first or possibly the only accelerating cavity of the accelerating structure.
  • This effect can be corrected by adding solenoids, arranged concentrically around the accelerating structure, to create a corrective magnetic field.
  • the object of the present invention is to correct the defocusing of a beam of charged particles, by virtue of the new arrangement of an accelerating cavity; this arrangement being on the one hand, of low cost, compared to the selenoids solution, and on the other hand applicable to all the cases previously mentioned.
  • a self-focusing accelerating cavity of charged particles intended to constitute the first or the only cavity of a linear accelerating structure, comprising a longitudinal axis around which it is delimited by a peripheral wall having a length parallel to said longitudinal axis and connecting an inlet wall to an outlet wall by which said accelerating cavity is delimited along said longitudinal axis, said longitudinal axis being coincident with the axis of a beam of charged particles accelerated under the effect of a wave electromagnetic and penetrating into said accelerating cavity by an inlet orifice which is provided with said inlet wall, said outlet wall being substantially perpendicular to said longitudinal axis and comprising an outlet orifice through which said beam exits from said accelerator cavity, is characterized in that at least one central area of the inlet wall is inclined on said longitudinal axis and deviates from it in the direction of propagation of said beam, so as to form a surface of revolution admitting said longitudinal axis as axis of revolution and, constituting by this surface of revolution a focusing
  • Accelerating cavities for linear accelerating structure of particles charged are constituted by resonant cavities which, in the prior art, have an entry wall normal to the axis of the particle beam; these resonant cavities are excited in such a way that the maximum electric field component is on the beam axis, field lines in the vicinity of the beam axis then being parallel to this axis.
  • the inclination of the entry wall on the axis of the beam determines a radial component in the electric field, while retaining the maximum component of electric field on the beam axis; this radial component tending to cause the field lines in the vicinity of the axis to converge towards this axis, causing a focusing effect of the charged particles.
  • FIG. 1 partially shows a linear accelerating structure 1 of charged particles comprising a first cavity formed by an accelerating cavity CA according to the invention, followed by n accelerating cavities C1, C2, n being in the example equal to 2.
  • the structure 1 comprises a longitudinal axis 3, coincident with the axis of symmetry of the first cavity CA, and which also constitutes the axis of a beam of particles (not shown) propagating in the direction of the arrow 2; this particle beam is accelerated by the energy of an electromagnetic wave (not shown) conventionally injected into the structure by a coupling means 4.
  • the electromagnetic wave is injected into a accelerating cavity C1, which follows the first accelerating cavity CA; this wave can also be injected at another level, and in particular at that of the first cavity CA, when the latter constitutes in a known manner, the only accelerating cavity of a structure (not shown).
  • Coupling means between the cavities CA, C1, C2, as well as other details of the accelerating structure 1 are not shown, this structure being, apart from the shape of an inlet wall 8 of the first accelerating cavity CA according to the invention, of a conventional type.
  • the accelerating cavity CA has a circular section, delimited by a peripheral wall 30 parallel to the longitudinal axis 3 and connecting the inlet wall 8 to an outlet wall 12; the section of the accelerating cavity CA being in a plane perpendicular to that of FIG. 1, it is not visible on the latter.
  • the inlet wall 8 comprises a central zone ZC which, from the inlet orifice 7, is inclined on the axis 3 of the beam and deviates from it in the direction 2 of propagation of the latter, so as to form a surface of revolution 10 admitting the axis 3 of the beam as axis of revolution; this surface of revolution 10, of conical shape in the nonlimiting example described, being also defined on the one hand, by a generatrix formed of a straight line It coincides in the plane of the figure with the surface of revolution 10, and d on the other hand, by a director made up of a circle 9 which, in the plane of the figure, forms a straight line represented in dotted lines.
  • the surface of revolution 10 is linked to a peripheral surface 13 of the inlet wall 8 by an intermediate surface 14; this shape of the inlet wall 8, shown by way of nonlimiting example, being intended to obtain the desired resonant frequency of the cavity CA according to the invention.
  • this focusing effect is attributed to the existence, in the accelerating cavity CA according to the invention, of a radial component of electric field, caused in the nonlimiting example described, by the inclination on the axis of the beam 3 of a central zone ZC of the inlet wall 8; field lines L1, L2, L3 ... Ln between the central zone ZC and the outlet wall 12, then tend to converge from this central zone towards the axis 3 of the beam and, tend to become parallel to the latter, the outlet wall 12 being substantially perpendicular to this axis 3 of the beam.
  • An optimum value of the angle ⁇ depends on the desired amplitude of this focusing effect, and its determination takes into account in particular the divergence and the energy of the beam of particles entering the accelerating cavity CA according to the invention.
  • the generator 11 of the surface of revolution 10 could be extended, as shown by the line in dotted lines 11A; the wall 8 thus being totally inclined on the longitudinal axis 3 and joining the peripheral wall 30 at a distance D 'from the outlet wall 12; the height H of the surface of revolution 10, reported on the longitudinal axis 3, being in all cases less than a distance D2 constituted by the path of the particles charged in the accelerating cavity CA along the longitudinal axis 3.
  • This configuration is possible in the case where the potential difference between the inlet wall 8 and the opposite wall 12 is small enough to avoid breakdown, as is often the case in a pre-groove cavity; this latter function can advantageously be fulfilled by the cavity CA according to the invention, thanks to the focusing effect of the charged particles which it produces.
  • the surface of revolution 10 of the accelerating cavity CA can also include, as shown in FIG. 2, a first or a second curved generator 20, 21 giving the surface of revolution 10 either a convex shape thanks to the first curved generator 20, or a concave shape thanks to the second curved generator 21.
  • an accelerating cavity according to the invention makes it possible to focus the charged particles of an accelerated beam in a linear accelerating structure, thanks to the shape of its inlet wall 8; such a CA cavity provides a simple solution applicable to all types of linear accelerators.
EP84400968A 1983-05-20 1984-05-11 Beschleunigender, autofokussierender Hohlraum für geladene Teilchen Expired EP0127512B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8308427A FR2546360B1 (fr) 1983-05-20 1983-05-20 Cavite acceleratrice autofocalisante de particules chargees
FR8308427 1983-05-20

Publications (2)

Publication Number Publication Date
EP0127512A1 true EP0127512A1 (de) 1984-12-05
EP0127512B1 EP0127512B1 (de) 1988-07-20

Family

ID=9289057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400968A Expired EP0127512B1 (de) 1983-05-20 1984-05-11 Beschleunigender, autofokussierender Hohlraum für geladene Teilchen

Country Status (4)

Country Link
US (1) US4594530A (de)
EP (1) EP0127512B1 (de)
DE (1) DE3472878D1 (de)
FR (1) FR2546360B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103068144A (zh) * 2012-12-25 2013-04-24 江苏达胜加速器制造有限公司 一种设有聚焦线圈的加速管

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4906896A (en) * 1988-10-03 1990-03-06 Science Applications International Corporation Disk and washer linac and method of manufacture
US5014014A (en) * 1989-06-06 1991-05-07 Science Applications International Corporation Plane wave transformer linac structure
US5381072A (en) * 1992-02-25 1995-01-10 Varian Associates, Inc. Linear accelerator with improved input cavity structure and including tapered drift tubes
DE19940932A1 (de) * 1999-08-27 2001-03-01 Alban Kellerbauer Einrichtung zur Transformation eines Primär-Ionenstrahls hoher Energie in einen Ionenstrahl niedriger Energie

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359452A (en) * 1965-10-14 1967-12-19 Quentin A Kerns Resonator for supporting non-sinus-oidal preiodic waveforms
FR2038562A5 (en) * 1969-03-19 1971-01-08 Commissariat Energie Atomique Linear accelerator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068397B (de) * 1959-11-05
BE481272A (de) * 1945-12-17
GB658779A (en) * 1947-10-31 1951-10-10 Standard Telephones Cables Ltd Electron lenses for use in vacuum tubes
US3436588A (en) * 1966-11-10 1969-04-01 Varian Associates Electrostatically focused klystron having cavities with common wall structures and reentrant focusing lens housings
DE1764101A1 (de) * 1967-04-10 1972-03-16 Inst De Fizica Atomica Linearbeschleuniger mit hoher Intensitaet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359452A (en) * 1965-10-14 1967-12-19 Quentin A Kerns Resonator for supporting non-sinus-oidal preiodic waveforms
FR2038562A5 (en) * 1969-03-19 1971-01-08 Commissariat Energie Atomique Linear accelerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103068144A (zh) * 2012-12-25 2013-04-24 江苏达胜加速器制造有限公司 一种设有聚焦线圈的加速管

Also Published As

Publication number Publication date
EP0127512B1 (de) 1988-07-20
FR2546360B1 (fr) 1986-03-21
US4594530A (en) 1986-06-10
DE3472878D1 (en) 1988-08-25
FR2546360A1 (fr) 1984-11-23

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