US3492592A - Device for dividing a beam of particles emerging from a particle accelerator - Google Patents

Device for dividing a beam of particles emerging from a particle accelerator Download PDF

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Publication number
US3492592A
US3492592A US602669A US3492592DA US3492592A US 3492592 A US3492592 A US 3492592A US 602669 A US602669 A US 602669A US 3492592D A US3492592D A US 3492592DA US 3492592 A US3492592 A US 3492592A
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dividing
electrodes
voltage
beams
frequency
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US602669A
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English (en)
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Roger M Jean
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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
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • 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

Definitions

  • a device for dividing a beam of particles emerging from a particle accelerator in which at least one set of deflecting electrodes are placed along the path of the particle beam, and in which energization of the deflecting electrodes is realized by means of alternating voltage of half the frequency of the voltage used in connection with the accelerator.
  • a phase-shift network may be inserted to adjust the deflecting voltage in relation to the beam.
  • another set of similar deflecting electrodes may be placed along the path of each subdivided beam so that any number of partial beams can be obtained from the original beam.
  • the present invention relates to particle accelerators and more particularly to the utilization of particle beams emerging from high frequency accelerators.
  • the particle output yielded by an accelerator is generally much higher than it is needed in most cases where a beam of accelerated particles is employed. It is therefore highly desirable to be able to divide a particle beam emerging from an accelerator into several beams of lower intensity, propagating in different directions, in order that several users, placed if necessary in different premises, may proceed simultaneously with their respective experiments.
  • the septum Since the septum must absorb as little as possible of 3,492,592 Patented Jan. 27, 1970 ice the incident beam, it should have a small cross section and yet be suitably cooled. In practice, rapid erosion takes place and the working life of this element is greatly reduced. Moreover, the septum must be removable in order to permit the use of the direct beam when required.
  • This invention makes use of the fact that the particle beam produced in accelerators operated by alternating voltages is formed by a sequence of particle groups or bunches at the rate of one group per cycle of the accelerating voltage, and provides electrostatic means for deflecting the successive particle groups alternately in two different directions so as to form in these directions two beams having each an intensity equal substantially to one-half of the initial beam intensity.
  • the present invention consists in a device for dividing a beam of accelerated particles emerging from an accelerator fed by an alternating accelerating voltage of frequency F, wherein there are provided two plane electrodes located one on either side of the beam to be divided, a source of alternating voltage of frequency F/2, connected between said two electrodes, and a phase shift device allowing the phase difference to be adjusted between F and F/2.
  • the alternating electric field of frequency F/2 set up between the two electrodes, has its highest values, alternately positive and negative, just during the time intervals in which the successive particle groups traverse the space defined between the electrodes, and these groups are deflected alternately toward each of the two electrodes thus forming two new beams having different directions.
  • FIGURE 1 represents schematically one arrangement in accordance with the invention.
  • FIGURE. 2 is a modified arrangement in accordance with the invention.
  • FIGURE 1 represents schematically an arrangement comprising a particle accelerator 1 which produces a beam indicated by the dotted line 2, a generator 3 of frequency F, supplying an accelerated voltage required for the operation of the accelerator 1, a frequency divider 4, producing an alternating voltage of frequency F/2 derived from the voltage of frequency F of the generator 3, a phase shift device 5 permitting the phase of voltage F/Z to be adjusted with respect to that of voltage F, a high frequency transformer 6 having a primary winding 6 and a secondary winding 6", and two deflecting electrodes 7 and 8 located one on either side of the beam 2 and connected to the two terminals of the secondary winding 6", respectively.
  • the space defined between the electrodes 7 and 8 is traversed (in a jerky fashion) by the beam 2 which is formed by particle groups or bunches succeeding each other at the frequency F.
  • the phase of the voltage F/ 2 with the aid of the phase shifter 5 the highest values, alternately positive and negative, are given to the alternating electric field which prevails in the space defined between the electrodes 7 and 8 at the instants during the time periods when the accelerated particle groups are in this space.
  • the particle groups or bunches are deflected alternately toward the two electrodes and thence propagate in two different directions 2' and 2".
  • either of 3 the beams 2 and 2", or both of them can be deflected by means of magnetic deflectors.
  • FIGURE 1 such a deflector is indicated schematically at 9 where the direction of beam 2" is deviated into 2".
  • Each of the divisional beams may, if desired, be divided again into two new beams of different directions, and so on.
  • the divisional beam 2' is divided into two new beams 21 and 22 by means of a similar dividing device comprising two deflecting electrodes 70 and 80 and an energizing means 40 similar to that which energizes electrodes 7 and 8.
  • These additional deflectors comprise each a pair of plates (11' and 11", 12 and 12") between which there is established a direct current electric field, provided by a source of voltage not shown.
  • FIGURES 1 and 2 permit the use, as desired, of either the two divisiona1 beams 2 and 2", or only the initial beam 2. In the latter case, it suflices indeed to switch off the voltage F/ 2 so that the beam 2 passes between the electrodes 7 and 8 without being deflected.
  • a device for dividing a beam of accelerated particles emerging from an accelerator fed by an alternating accelerating voltage of frequency F and for supplying thereby two divisional beams said device comprising two plane electrodes located one on either side of the beam to be divided, a source of alternating voltage of frequency F 2, connected between said two electrodes, and a phase shift device allowing the phase difference to be adjusted between said voltages at a frequency respectively F and F 2.
  • a device as claimed in claim 2 further com rising means for further dividing at least one of the divisional beams.
  • a particle accelerator comprising means for applying to said accelerator an alternating accelerating voltage, a device for dividing a beam, consisting of a succession of bunches, at a predetermined frequency, of ac celerated particles, comprising two plane electrodes located one on either side of said beam and energizing means, including phase-adjusting means, connected with said electrodes for applying thereto an AC. voltage having a frequency equal to half said predetermined freqency.

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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)
  • Plasma & Fusion (AREA)
  • Particle Accelerators (AREA)
US602669A 1965-12-27 1966-12-19 Device for dividing a beam of particles emerging from a particle accelerator Expired - Lifetime US3492592A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR43823A FR1469111A (fr) 1965-12-27 1965-12-27 Dispositif de division des faisceaux produits par des accélérateurs de particules

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US3492592A true US3492592A (en) 1970-01-27

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US (1) US3492592A (enrdf_load_stackoverflow)
DE (1) DE1539847B2 (enrdf_load_stackoverflow)
FR (1) FR1469111A (enrdf_load_stackoverflow)
GB (1) GB1115299A (enrdf_load_stackoverflow)
NL (1) NL6617205A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465310A1 (fr) * 1979-09-17 1981-03-20 Varian Associates Appareil et procede de focalisation pour le balayage en double deviation d'un faisceau de particules chargees

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013213168A1 (de) * 2013-07-04 2015-01-08 Siemens Aktiengesellschaft Verfahren zum Steuern eines Protonen-Strahls

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2269688A (en) * 1941-02-24 1942-01-13 Radio Patents Corp Electronic modulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2269688A (en) * 1941-02-24 1942-01-13 Radio Patents Corp Electronic modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465310A1 (fr) * 1979-09-17 1981-03-20 Varian Associates Appareil et procede de focalisation pour le balayage en double deviation d'un faisceau de particules chargees

Also Published As

Publication number Publication date
NL6617205A (enrdf_load_stackoverflow) 1967-06-28
DE1539847B2 (de) 1977-03-24
GB1115299A (en) 1968-05-29
DE1539847A1 (de) 1969-12-18
FR1469111A (fr) 1967-02-10

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