US3389283A - Electrode structure cyclotron having grounded coupling plates between the dee-rings - Google Patents

Electrode structure cyclotron having grounded coupling plates between the dee-rings Download PDF

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Publication number
US3389283A
US3389283A US419513A US41951364A US3389283A US 3389283 A US3389283 A US 3389283A US 419513 A US419513 A US 419513A US 41951364 A US41951364 A US 41951364A US 3389283 A US3389283 A US 3389283A
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electrodes
dee
cyclotron
coupling
electrode
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Expired - Lifetime
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US419513A
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English (en)
Inventor
Schnuriger Jean Claude
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Thales SA
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CSF Compagnie Generale de Telegraphie sans Fil SA
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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
    • H05H13/00—Magnetic resonance accelerators; Cyclotrons

Definitions

  • the present invention relates to cyclotrons, and more particularly to cyclotrons of the type comprising dee electrodes of sectoral shape with the sector angle reduced below 180, separated by electrodes electrically or galvanically connected to ground.
  • such a cyclotron is capable of operating with harmonic acceleration (acceleration realized with a ratio between the period of the excitation frequency and the period of cyclotron rotation of the particles equal to an integral number greater than one), either in that the dee electrodes are excited in phase opposition, producing an operation at the fundamental or at an odd harmonic, or in that they are excited in phase, producing an operation at an even harmonic.
  • harmonic acceleration acceleration realized with a ratio between the period of the excitation frequency and the period of cyclotron rotation of the particles equal to an integral number greater than one
  • the ratio between these two capacities assumes a small value, for example, of the order of 0.1 in practice.
  • the desired separation increases with increase in this ratio, and with a ratio of the order of 0.1, one can obtain in practice only a separation, expressed with respect to the average operating frequency, of the order of 1% or less.
  • the object of the present invention consists in providing coupling means, assuring a strong separation of the modes within a cyclotron whose dee electrodes are separated by electrodes galvanically connected to ground.
  • the coupling means are constituted by at least one electrode insulated from ground and extending parallelly to the dee electrode between the lat-ter and the wall of the evacuated box.
  • this electrode possesses a form presenting plain portions having substantially the same contour as the portions of the dee electrodes which face the same, these plain portions being operatively connected by connections or notched parts presenting a relatively reduced surface facing the walls of the evacuated box, thus realizing the relatively high ratio between the capacitances (lees-auxiliary electrode and auxiliary electrode-ground.
  • Another object of the present invention resides in the provision of an electrode structure for cyclotrons which permits by simple means to separate the different modes of resonance of the system of the dee electrodes.
  • Still another object of the present invention resides in the provision of an auxiliary electrode structure providing coupling means between the dee electrodes and the surrounding walls of the casing which is so constructed and arranged as to assure a relatively high ratio of the capacitance between the auxiliary coupling electrode and the dee electrodes and the capacitance between the auxiliary coupling electrode and the surrounding walls of the evacuated box structure.
  • Still another object of the present invention resides in the provision of an electrode structure of cyclotrons in which the resonant frequencies of the system correspond ing to the different modes of excitation are eifectively separated without decoupling the dee electrodes.
  • FIGURE 1 is a partial longitudinal cross sectional view of a cyclotron provided with coupling means according to the present invention
  • FIGURE 2 is a partial transverse cross sectional view through the cyclotron of FIGURE 1, taken along the IIII of FIGURE 1,
  • FIGURE 3 is a plan view on an electrode constituting a coupling means in accordance with the present invention.
  • FIGURE 4 is a plan view on a modified embodiment of an electrode forming a coupling means in accordance with the present invention.
  • FIGURES 1 and 2 there is shown for illustrative purposes in these two figures, a cyclotron having two dee electrodes 1 and 2 of 3 sectoral shape with the sector angle thereof reduced to 90, separated by two electrodes 3 and 4' of a shape similar to the dee electrodes l. and 2 but constituting inactive dee electrodes which are connected to the ground constituted by the evacuated box 5.
  • the dee electrodes 1 and 2 are supported by beam-like supports 6 and 7, connected to the high frequency circuit of the cyclotron, which has not been shown since its construction is conventional and forms no part of the present invention. Similarly, the conventional pole pieces of the cyclotron also have not een shown for sake of simplicity of the drawing.
  • the coupling between the dee electrodes 1 and 2, which are otherwise decoupled by the inactive dee electrodes 3 and d, electrically or galvanically connected to ground, is realized by means of the auxiliary electrodes 3 and 9, insulated from ground and extending parallelly to the dee electrodes 1 and 2 between the latter and the walls of the evacuated box 5.
  • FIGURE 3 represents a plan View of each of the auxiliary electrodes 8 and 9.
  • This auxiliary electrode is formed by a rectangular plate suitably cut out in such a manner as to form with the dee electrodes it and Z a relatively strong capacitance and with the evacuated box 5 a relatively slight capacitance. lit may be seen from this figure that the cut-out portion leaves the plain triangular portions it? and 11 which are placed facing the sectoral surfaces of the dee electrodes it and 2. These portions, in particular the apices of the triangles it? and 11, are interconnected by connections or narrow bands 12 and 13 whose surfaces facing the wall 5 are relatively restricted in such a manner that the capacity between the electrode 3 and ground is only slightly higher than the capacity between the electrode 8 and the dee electrodes It and 2.
  • the triangles lit? and 11 analogous to that of FIGURE 3 are connected with each other, not by the bands 12 and 13 interconnecting opposite apices thereof, but by bands 12' and 13' interconnecting intermediate points of the sides of these triangles. In this manner one may obtain a further relative diminution of the capacity formed between the interconnecting bands 12' and 13' and ground.
  • auxiliary electrode means insulated from ground and extending parallelly to said dee electrdoes between the surfaces thereof and the internal walls of said envelope.
  • said coupling electrode means being so shaped and positioned that the capacitance formed between said coupling electrode means and said dee electrodes is relatively high with respect to the capacitance formed between said coupling electrode means and ground,
  • said coupling electrode means having a shape with plain parts of substantially the same contour as the parts of said dee electrodes facing said plain parts, and connections between said plain parts of relatively reduced surface and facing the wall of said envelope,
  • said plain parts being substantially triangularly shaped with metallic bands interconnecting opposite sides of respective triangles.
  • a cyclotron having a grounded evacuated envelope, at least one pair of dee electrodes Within said envelope each having a sectoral shape with the sector angle less than 180, and at least one pair of grounded decoupling electrodes, each separating two of said dee electrodes,
  • auxiliary means providing a relatively high ratio of the capacitance between said auxiliary means and said dee electrodes to the capacitance between said auxiliary means and said envelope.
  • a cyclotron having a grounded evacuated envelope, at least one pair of dee electrodes within said envelope each having a sectoral shape with the sector angle less than 180, and at least one pair of grounded decoupling electrodes, each separating two of said dee electrodes,
  • auxiliary means providing a relatively high ratio of the capacitance between said auxiliary means and said dee electrodes to the capacitance between said auxiliary means and said envelope, said auxiliary means being positioned between said dee electrodes and the internal walls of said envelope.
  • auxiliary electrode means providing a relatively high ratio of the capacitance between said auxiliary means and said dee electrodes to the capacitance between said auxiliary means and said envelope.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)
US419513A 1963-12-19 1964-12-18 Electrode structure cyclotron having grounded coupling plates between the dee-rings Expired - Lifetime US3389283A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR957735A FR1388835A (fr) 1963-12-19 1963-12-19 Perfectionnements aux cyclotrons

Publications (1)

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US3389283A true US3389283A (en) 1968-06-18

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US419513A Expired - Lifetime US3389283A (en) 1963-12-19 1964-12-18 Electrode structure cyclotron having grounded coupling plates between the dee-rings

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US (1) US3389283A (xx)
CH (1) CH429972A (xx)
DE (1) DE1255828B (xx)
FR (1) FR1388835A (xx)
GB (1) GB1022740A (xx)
NL (2) NL6414763A (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718865A (en) * 1970-04-29 1973-02-27 Philips Corp Device for accelerating charged atomic particles including a pair of high frequency resonators
WO2019020160A1 (en) * 2017-07-24 2019-01-31 Aima Developpement CYCLOTRON COMPACT WITH CLOVER-SHAPED ELECTRODES

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455801C1 (ru) * 2011-02-01 2012-07-10 Объединенный Институт Ядерных Исследований Способ уменьшения энергетического разброса пучка частиц в циклотроне

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713635A (en) * 1949-12-19 1955-07-19 Leitz Ernst Gmbh Electron-cyclotron discharge apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713635A (en) * 1949-12-19 1955-07-19 Leitz Ernst Gmbh Electron-cyclotron discharge apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718865A (en) * 1970-04-29 1973-02-27 Philips Corp Device for accelerating charged atomic particles including a pair of high frequency resonators
WO2019020160A1 (en) * 2017-07-24 2019-01-31 Aima Developpement CYCLOTRON COMPACT WITH CLOVER-SHAPED ELECTRODES

Also Published As

Publication number Publication date
FR1388835A (fr) 1965-02-12
NL6414763A (xx) 1965-06-21
NL132319C (xx)
DE1255828B (de) 1967-12-07
GB1022740A (en) 1966-03-16
CH429972A (fr) 1967-02-15

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