US3067359A - Structure for linear ion accelerators - Google Patents

Structure for linear ion accelerators Download PDF

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Publication number
US3067359A
US3067359A US809514A US80951459A US3067359A US 3067359 A US3067359 A US 3067359A US 809514 A US809514 A US 809514A US 80951459 A US80951459 A US 80951459A US 3067359 A US3067359 A US 3067359A
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United States
Prior art keywords
cavity
tubes
linear ion
ion accelerators
accelerators
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Expired - Lifetime
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US809514A
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English (en)
Inventor
Pottier Jacques
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
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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
    • H05H9/00—Linear accelerators
    • H05H9/04—Standing-wave linear accelerators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/04—Electrodes; Screens

Definitions

  • the present invention relates to an apparatus for linearly accelerating ions and comprising in a known fashion a source for producing ionized particles, a structure for producing an accelerating electrical field capable of increasing the kinetic energy of the ionized particles and a target to be bombarded by them.
  • FIG. 1 Several types of such accelerators are known of which a number are improved versions of the so called Wideroe accelerator (FIG. 1).
  • the tubes 1 and 2 called sliding tubes, disposed along the axis of the accelerator, are connected alternatively to the two posts of a high frequency generator 3.
  • the ions, injected by the source 4, are accelerated within the space separating each tube from the next.
  • the transit time in one cell i.e. in one tube and one space of acceleration, corresponds to a half cycle of the high frequency.
  • the ions finally reach the target 5.
  • the present invention relates to linear ion accelerators having a new structure imparting to the apparatus a very high efiiciency, particularly at low energy levels.
  • the new structure is essentially characterized in that in order to reduce the energy losses, sliding tubes are disposed inside a resonant cavity, means being foreseen to elfect the transmission to the said sliding tubes of the high frequency energy applied to the resonant cavity.
  • a fairly low coefiicient of overstrain is thereby achieved for the whole unit, which allows as in the case of pulsated accelerators the use of short duration pulses and a simultaneous concentration of energy in the vicinity of the axis, that is to say in the path of the particles to be accelerated, while reduced geometrical dimensions are being preserved for the cavity.
  • FIGS. 3 and 4 hereinafter will be described various examples of embodiment of the present invention but these should be taken as hav- "ice ing no limiting effect upon the scope of the invention.
  • the embodiments to be described in relation to these examples are to be considered as being part of the invention, it being understood that equivalent embodiments could just as well be used without departing from the scope of the invention.
  • FIGURE 3 is a schematic blown up view of the cavity structure, resonating according to the mode H
  • FIGURE 4 is a schematic blown up view of the cavity structure, resonating according to the mode H
  • FIGURE 3 shows a cylindrical resonant cavity 6 into which is axially disposed a series of sliding tubes 1 and 2, which are linked respectively to the two posts of a high frequency generator 3.
  • This simplified illustration of the feeding of cavity 6 by the generator 3 is purely symbolic since in practice such means of high frequency feeding as for instance a coupling by loops are used.
  • the cavity 6 resonates according to the mode H and the means foreseen for transmitting to the sliding tubes 1 and 2 the high frequency energy provided by the generator 3 consist in two flat electrically conductive plates 7 and 8, each being linked or connected to one of the two series of tubes 1 and 2.
  • the contact generatrixes of the plates 7 and 8 and the resonant cavity 6, of which one only is visible in the blown up View (FIGURE 3) are those between which there exists the maximum amount of tension.
  • the charge held up by the capacitance existing between the two series of sliding tubes is very important, so that the diameter of the cavity 6 is considerably smaller than that of the uncharged cavity.
  • the radius of the cavity 6, according to the invention is inversely proportional to the spark gap frequency of the cavity 6, considered as a wave channel; that is to say, of the order of fifty centimeters for a spark gap frequency of 50 mHz. This therefore leads to very reduced lateral dimensions for the cavity 6, a feature of significant interest in the case of accelerators designed to operate at very low frequencies (i.e. in particular, the case of heavy ion accelerators).
  • FIGURE 4 The very similar structure illustrated in FIGURE 4 is that derived from the mode of resonance H In this case the sliding tubes 1 and 2 are supported on each side by conductor plates 10, 11, 12 and 13, which can render the construction of the particular structure easier.
  • a structure for linear ion accelerators characterized by the combination of a substantially cylindrical hollow resonant cavity fed at high frequency and having an inner surface, two series of drift tubes alternately disposed inter nally along the axis of said cavity, at least one electrically conducting flat plate parallel to the axis of the cavity electrically connecting all of the tubes of one of said series of drift tubes in a straight line to the inner surface of the cavity, at least one second flat plate electrically connecting all of the tubes of the other of said series of drift tubes in a straight line parallel to the axis of the cavity to the inner surface of the cavity, said lines of connection having a maximum amount of voltage therebetween and said conducting plates equalizing the resonant frequency in each section of the cavity.
  • a structure for linear ion accelerators as described in claim 1 wherein said cavity is symmetrical with respect to a diametric plane whereby oscillations of the H type are obtained, said plates are two in number, are indented between said drift tubes, are diametrically located within the cavity and support said drift tubes.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)
US809514A 1958-05-05 1959-04-28 Structure for linear ion accelerators Expired - Lifetime US3067359A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1146990X 1958-05-05

Publications (1)

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US3067359A true US3067359A (en) 1962-12-04

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ID=9645675

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US809514A Expired - Lifetime US3067359A (en) 1958-05-05 1959-04-28 Structure for linear ion accelerators

Country Status (7)

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US (1) US3067359A (nl)
CH (1) CH357484A (nl)
DE (1) DE1146990B (nl)
FR (1) FR1195616A (nl)
GB (1) GB871415A (nl)
LU (1) LU37155A1 (nl)
NL (1) NL238839A (nl)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3316440A (en) * 1962-07-04 1967-04-25 Leboutet Hubert Cavity resonator delay circuit having interdigitally supported drift tubes and a continuous undulating conductor
US3324340A (en) * 1963-10-08 1967-06-06 Csf Linear travelling wave particle accelerator having spaced shaped apertures
US3332024A (en) * 1962-09-04 1967-07-18 Csf Heavy particle linear accelerator with continuous variation of output energy
US3353107A (en) * 1959-10-06 1967-11-14 High Voltage Engineering Corp High voltage particle accelerators using charge transfer processes
US3361980A (en) * 1965-10-19 1968-01-02 Bell Telephone Labor Inc Spatially alternating gradient voltage system for a van de graaff accelerator
US3402358A (en) * 1964-11-09 1968-09-17 Research Corp Neutral particle beam accelerator having transverse electrodes and steering means for the particle beam
US3466554A (en) * 1967-03-10 1969-09-09 Atomic Energy Commission Accelerator apparatus and method of shaping cavity fields
US4596946A (en) * 1982-05-19 1986-06-24 Commissariat A L'energie Atomique Linear charged particle accelerator
EP1505855A2 (de) * 2003-07-22 2005-02-09 Gesellschaft für Schwerionenforschung mbH Driftröhrenbeschleuniger zur Beschleunigung von Ionenpaketen
US20170194072A1 (en) * 2014-09-22 2017-07-06 Mitsubishi Electric Corporation Connection plates for power feeding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390069B1 (nl) * 1977-05-05 1981-04-30 Commissariat Energie Atomique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289952A (en) * 1940-11-28 1942-07-14 Rca Corp Electron gun
US2547061A (en) * 1945-12-17 1951-04-03 Int Standard Electric Corp Multiple gap velocity modulation tube
US2760103A (en) * 1950-12-22 1956-08-21 Collins Radio Co Multiple mode excitation apparatus
US2770755A (en) * 1954-02-05 1956-11-13 Myron L Good Linear accelerator
US2853642A (en) * 1955-02-23 1958-09-23 Hughes Aircraft Co Traveling-wave tube
US2891191A (en) * 1953-11-18 1959-06-16 Bell Telephone Labor Inc Backward wave tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR850270A (nl) * 1938-02-16 1939-12-12
BE467090A (nl) * 1946-01-31

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289952A (en) * 1940-11-28 1942-07-14 Rca Corp Electron gun
US2547061A (en) * 1945-12-17 1951-04-03 Int Standard Electric Corp Multiple gap velocity modulation tube
US2760103A (en) * 1950-12-22 1956-08-21 Collins Radio Co Multiple mode excitation apparatus
US2891191A (en) * 1953-11-18 1959-06-16 Bell Telephone Labor Inc Backward wave tube
US2770755A (en) * 1954-02-05 1956-11-13 Myron L Good Linear accelerator
US2853642A (en) * 1955-02-23 1958-09-23 Hughes Aircraft Co Traveling-wave tube

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3353107A (en) * 1959-10-06 1967-11-14 High Voltage Engineering Corp High voltage particle accelerators using charge transfer processes
US3316440A (en) * 1962-07-04 1967-04-25 Leboutet Hubert Cavity resonator delay circuit having interdigitally supported drift tubes and a continuous undulating conductor
US3332024A (en) * 1962-09-04 1967-07-18 Csf Heavy particle linear accelerator with continuous variation of output energy
US3324340A (en) * 1963-10-08 1967-06-06 Csf Linear travelling wave particle accelerator having spaced shaped apertures
US3402358A (en) * 1964-11-09 1968-09-17 Research Corp Neutral particle beam accelerator having transverse electrodes and steering means for the particle beam
US3361980A (en) * 1965-10-19 1968-01-02 Bell Telephone Labor Inc Spatially alternating gradient voltage system for a van de graaff accelerator
US3466554A (en) * 1967-03-10 1969-09-09 Atomic Energy Commission Accelerator apparatus and method of shaping cavity fields
US4596946A (en) * 1982-05-19 1986-06-24 Commissariat A L'energie Atomique Linear charged particle accelerator
EP1505855A2 (de) * 2003-07-22 2005-02-09 Gesellschaft für Schwerionenforschung mbH Driftröhrenbeschleuniger zur Beschleunigung von Ionenpaketen
EP1505855A3 (de) * 2003-07-22 2009-09-23 Gesellschaft für Schwerionenforschung mbH Driftröhrenbeschleuniger zur Beschleunigung von Ionenpaketen
US20170194072A1 (en) * 2014-09-22 2017-07-06 Mitsubishi Electric Corporation Connection plates for power feeding
US9934884B2 (en) * 2014-09-22 2018-04-03 Mitsubishi Electric Corporation Connection plates for power feeding

Also Published As

Publication number Publication date
NL238839A (nl) 1964-02-05
DE1146990B (de) 1963-04-11
CH357484A (fr) 1961-10-15
LU37155A1 (nl)
FR1195616A (fr) 1959-11-18
GB871415A (en) 1961-06-28

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