WO2014041031A1 - Arrangement for generating a proton beam and an installation for transmutation of nuclear wastes - Google Patents

Arrangement for generating a proton beam and an installation for transmutation of nuclear wastes Download PDF

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Publication number
WO2014041031A1
WO2014041031A1 PCT/EP2013/068838 EP2013068838W WO2014041031A1 WO 2014041031 A1 WO2014041031 A1 WO 2014041031A1 EP 2013068838 W EP2013068838 W EP 2013068838W WO 2014041031 A1 WO2014041031 A1 WO 2014041031A1
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Prior art keywords
fibers
target
order
fiber
arrangement according
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PCT/EP2013/068838
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French (fr)
Inventor
Tajima TOSHIKI
Gérard MOUROU
Sydney Gales
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Ecole Polytechnique
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Ecole Polytechnique
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Priority to JP2015531549A priority Critical patent/JP6462568B2/en
Priority to US14/428,552 priority patent/US10049778B2/en
Publication of WO2014041031A1 publication Critical patent/WO2014041031A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G1/00—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes
    • G21G1/04—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators
    • G21G1/10—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators by bombardment with electrically charged particles
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G1/00—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes
    • G21G1/04—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators
    • G21G1/06—Arrangements for converting chemical elements by electromagnetic radiation, corpuscular radiation or particle bombardment, e.g. producing radioactive isotopes outside nuclear reactors or particle accelerators by neutron irradiation
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
    • G21G4/00—Radioactive sources
    • G21G4/02—Neutron sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • 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
    • H05H15/00—Methods or devices for acceleration of charged particles not otherwise provided for, e.g. wakefield accelerators
    • 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
    • H05H3/00—Production or acceleration of neutral particle beams, e.g. molecular or atomic beams
    • H05H3/06—Generating neutron beams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping

Definitions

  • the laser-pulse produced by oscillator 8 passes through a pair of diffraction gratings 10 which are representated in form of a boxes the structure of which is precised beneath and which stretch it by about 10 5 times in a manner known per se.
  • the stretching separates the various components of the stretch pulse, producing a rainbow in time.
  • the pulse after stretching is at the millijoule (mJ) level.
  • FIG 3 shows the arrangement of the fibers in the region of the downward end of the fiber architecture.
  • each fiber is realized in two sections, an amplifying section 19 and a transport section 20 made of very low loss fiber 21.
  • the fiber amplifying sections 19 which constitute the last amplifier stage are arranged in a manner to form a great diameter bundle wherein the different sections are sufficiently separated from one another to ensure efficient cooling by means of an appropriate cooling medium.
  • the fiber transport sections 20, since they are very low loss fibers which need no particular cooling allow to transform the great diameter bundle in a small diameter output bundle 21 where the fibers are kept as closed as possible from each other to make the overall output pupil diameter as reduced as possible.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Particle Accelerators (AREA)

Description

"Arrangement for generating a proton beam and an installation for transmutation of nuclear wastes"
The invention relates to an arrangement for generating a proton beam and an installation for transmutation of nuclear wastes, particularly from nuclear reactors .
It is known that the transmutation of nuclear wastes from nuclear reactors needs to deposit a large amount of neutrons and gamma photons on hazardous nuclear isotopes. The conventional approach is to use fast neutrons generated by fast breeding reactors or a dedicated high power and high energy accelerator to bombard a spallation heavy weight target to produce high flux of neutrons which will induce transmutation of these isotopes .
A conventional arrangement for transmutation of nuclear wastes has the short-comings that it is very bulky and expensive. Its size may exceed the one of the nuclear reactor itself.
The invention has the object to overcome these shortcomings .
For reaching this object, the arrangement proposed by the invention is characterized in that it is constituted by a laser driven accelerator of protons adapted to produce a beam of relativistic protons of 0,5 GeV to 1 GeV with a current in the order of tens of mA, such as a current of 20 mA.
According to a feature of the invention, the arrangement is characterized in that it comprises a laser pulse source adapted to produce a beam of short pulses having a duration of hundreds of femtoseconds and an intensity greater than 1023 W/cm2 with a high-average power of the order of tens of MW and a proton target on which the laser beam is focused on. According to another feature of the invention, the arrangement is characterized in that the duration of the laser pulses is in the order of 30 femtoseconds.
According to still another feature of the invention, the arrangement is characterized in that the high-average power is in the order of 20 MW.
According to still another feature of the invention, the arrangement is characterized in that it comprises a laser pulse oscillator producing ultra-short pulses having a duration in the order tens of femtoseconds and an energy in the order of nanojoules and a single mode optical fiber amplifier device into which the produced laser pulses are fed in, comprising a multitude of optical fibers in view to form a coherent amplification network system.
According to still another feature of the invention, the arrangement is characterized in that said coherent amplification network system comprises a series of successive amplifier stages each comprising a bundle of single mode fiber amplifiers, in which the fibers are spaced from one another in view to allow passage of a cooling medium there between, the bundle of one stage comprising fibers which have been obtained by splitting of the fibers of the preceding stage bundle.
According to still another feature of the invention, the arrangement is characterized in that in the downward end the portion of the coherent amplification network, each fiber comprises two fiber sections, an amplifying fiber section belonging to the last amplifier stage in which the fibers are separated from on another for cooling reasons and a transport fiber section made of very low loss fiber, the transport fibers allowing to transform the great diameter bundle of the amplifier stage into a small diameter output bundle where the fibers are kept as close as possible from each other to make the overall output pupil diameter as reduced as possible . According to still another feature of the invention, the arrangement is characterized in that the proton target is a solid target formed by a film of a substance such as hydrogen, helium or carbon.
According to still another feature, the laser pulses source is adapted to produce laser pulses having a repetition rate in the order of Khz, such as 10 KHz.
The installation for transmutation of nuclear wastes is characterized in that it comprises the arrangement for producing the beam of relativistic protons and a spallation target for producing a beam of neutrons of 0,5 GeV to 1 GeV, which is directed towards nuclear waste, said spallation target being irradiated by the ultra-relativistic proton beam.
In accordance to an advantageous feature, the spallation target is a liquid target of Pb-Bi .
According to another feature, the installation is characterized in that the spallation target comprises an entrance window of high-stress steel and a cylindrical tube filled by a liquid of Pb-Bi alloy, the liquid alloy being used as cooling medium.
Other features and advantageous of the invention will become apparent from the description given below which only serves as an example and is in no way limiting the scope of the invention, with references to the attached drawings, wherein :
Figure 1 is a schematic diagram of an installation for transmutation of nuclear waste, according to the invention;
- Figure 2 is a view of an arrangement for producing a high-intensity and high-average beam of protons, according to the invention;
- Figure 3 is a schematic cross-section view of the optical fibers architecture of the transport fiber assembly along the line IV-IV of figure 2; and
- Figure 4 shows an installation according to the invention for transmutating nuclear waste. The invention will be described below in its application to transmutation of nuclear waste. This application however serves only as a non-exclusive example. It is to be noted that the invention covers all applications using a beam of relativistic protons obtained by the laser based method proposed by the invention .
As shown on figure 1, an installation for transmutating nuclear waste such as waste from nuclear reactors comprises an ultra-relativistic intensity pulse- laser source 1 susceptible to produce a laser beam 2 of ultra short laser pulses having a duration of for instance 30 femtoseconds (fs) and an intensity greater than 1023 W/cm2 with high-average power of the order of 20 MW, a proton target 3 on which the laser beam 2 is focused on and from which a beam of relativistic protons 4 of 0.5 GeV to 1 GeV with a current for instance of the order of 20 mA is produced. The latter irradiates a spallation target 5, for instance a liquid target of Pb- Bi where neutrons 6 of 0.5 to 1 GeV is spallated from. The neutrons are directed towards the nuclear waste 7 to be transmutated, such as spent nuclear fuel, in order to transmute the waste's radioactive isotope, i.e. lower actinides, into much safer materials or elements with significantly shorter half-lives.
With reference to figures 2 to 4, the ultra- relativistic intensity pulse-laser source 1 will be described here-below in a detailed manner.
As can be seen on figure 2, the source 1 comprises an oscillator 8 adapted to produce short pulses of for instance 30 femtoseconds (fs) duration and energy in the order of nanojoule (nJ) . The produced laser-pulse is fed into a single mode optical fiber amplifier arrangement comprising a multitude of optical fibers in view to form a coherent amplification network (CAN) system providing simultaneous high-peak and high-average powers with high efficiency greater than 30%, i.e. the laser beam 2 shown on figure 1 which may have an intensity greater than 10 W/cm2.
Concerning the coherent amplification network system reference is made to the publication "Euronnac, May 2012 Meeting CERN", IZEST, Ecole Po 1 yt echn ique , Palaiseau of Gerard Mourou and Toshiki Tajima, and to the publication "Coherent Beam Combining of 1,5 μιη Er Yb Doped Fiber Amplifiers", Fiber and Integrated Optics, 27(5) (2008) of S. Demoustier, C. Bellanger, A. Brignon and J. P. Huignard, and of "Collective Coherent Phase Combining of 64 fibers" Opt. Express, 19, Issue 18, 17053-17058 (2011) of J. Bourderionnet , C. Bellanger, J. Primot and A. Brignon.
More precisely, the laser-pulse produced by oscillator 8 passes through a pair of diffraction gratings 10 which are representated in form of a boxes the structure of which is precised beneath and which stretch it by about 105 times in a manner known per se. The stretching separates the various components of the stretch pulse, producing a rainbow in time. The pulse after stretching is at the millijoule (mJ) level.
The stretched pulses are coupled in a first amplifier stage 13 to a multiplicity of for instance 10 to 100 fibers 14, each constituting a single mode fiber amplifier. Each fiber will amplify the input pulse to the millijoule level. The amplified fibers are kept to form a bundle wherein the amplifying fibers are at a relatively large distance from one another in order to allow efficient cooling by an appropriate cooling medium for evacuating heat produced by the fibers.
The same operation is repeated in a second amplifier stage 15 where each fiber amplifier of the first stage 13 feeds a multiplicity of for instance 10 to 100 single mode amplifiers 16 of the same type as the ones of the first stage. Each fiber will amplify the input, which is a corresponding part of the output of the fiber from which it is obtained by splitting, to the millijoule level.
The same process is repeated in successive series of amplifier stages, one of which is furthermore shown in 17 on figure 2 which comprises a larger diameter bundle of fibers 19 spaced from one another for enabling efficient cooling of the fibers.
It results from the foregoing that by splitting and branching each single "seed" pulse a matrix of thousands of lasers is obtained. In each stage of the successive series of amplifier stages, the phase of each pulse is preserved .
The very great number of fibers of the last stage, on figure 2 the stage 17, are combined and phased with one another so as to form a single pulse, which is compressed by a pair of gratings in a manner known per se. The pulse energy can be now of tens of Joules, the pulse duration corresponding to the initial pulse duration of 30 femtoseconds of the present example.
Figure 3 shows the arrangement of the fibers in the region of the downward end of the fiber architecture. As can be seen, each fiber is realized in two sections, an amplifying section 19 and a transport section 20 made of very low loss fiber 21. The fiber amplifying sections 19 which constitute the last amplifier stage are arranged in a manner to form a great diameter bundle wherein the different sections are sufficiently separated from one another to ensure efficient cooling by means of an appropriate cooling medium. The fiber transport sections 20, since they are very low loss fibers which need no particular cooling allow to transform the great diameter bundle in a small diameter output bundle 21 where the fibers are kept as closed as possible from each other to make the overall output pupil diameter as reduced as possible.
The individual laser beams which get out at the ends of the small diameter fibers form a beam 22 of single pulse, after having been phase controlled to be in phase such as described in the before mentioned publication "Euronnac, May 2012, Meeting CERN, the teaching of which is considered to be included therein. Each amplified stretched output pulse is then compressed by means of a second pair of gratings 23 schematically shown on figure 2. The resulting pulse has the ultra¬ short duration of tens of femtoseconds such as of 30 femtoseconds of the original pulse produced by oscillator 9, but its energy is enormous of for instance 30 Joules.
Theses pulses are made to hit a parabolic mirror 30 which focuses it on the proton target 3 as can be seen on figure 4.
The resulting pulse is the high-average power and high-intensity pulse 2 shown on figure 1, which is in the ultra-relativistic regime, i.e. greater than 1023 W/cm2.
According to figures 1 and 3, these pulses 2 which can be produced at a repetition rate in the order of KHz for instance 10 kHZ, due to the efficient cooling of the single mode fiber amplifiers in their different bundles by means of an appropriate cooling medium, are made to shoot the proton target 3 which can be a solid target made of a substance such as hydrogen, helium and/or carbon, advantageously in form of a film 25. The shooting of the target produces the high-flux 4 of high-energy protons in the range of 0.5 to 1 GeV which is made to impinge on the spallation target 5 in order to be converted in the high-flux of fast energetic neutrons 6 by spallation process induced in the target 5 which is for instance a high-Z material target. It is to be noted that 1 GeV proton produces on the target about 30 neutrons which is a high multiplication factor.
The target 5 consists of an entrance window of high-stress steel and a cylindrical tube 27 of about 50 cm filled by a liquid Pb-Bi alloy for neutron production. This liquid alloy can be made to flow and circulate in a dedicated hydraulic circuit to maintain the temperature well below its critical value. Accordingly, the alloy is not only used for neutron production, but also as coolant .
By appropriate monitoring the corrosion and the stress in the entrance window as well as of the temperature gradient and the production of H and He in the target assembly, a safe operation of the system is insured .
In the conditions described above, the invention allows to produce efficient relativistic protons by shooting the solid target of hydrogen and/or helium within a laser at the density of greater than 1023 W/cm2. In this radiation dominated pressure regime, the momentum is transferred to ions through the electric filled arising from charge separation. In this regime, the proton component moves forward with almost the same velocity as the average longitudinal velocity of the electron component and renders the interaction very efficient, close to 100%. Moreover, the proton energy is a desired energy range between 0.5 and 1 GeV to produce the neutrons with the high-energy in order to achieve the transmutation of the nuclear waste 7.
It results from the foregoing that the laser based way to produce neutrons to be directed toward a target of nuclear waste comprises an oscillator for producing ultra-short laser pulses in the order of femtoseconds having an energy in order of millij oules, very far from the level of tens of joules necessary for the targeted application of the invention, such as transmutation of nuclear waste. To this end, the invention proposes to combine a very large number, i.e. 104 or more fibers coherently in the coherent amplification network system described above and shown on the figures. The repetition rate of the laser pulses having the intensity greater than 1023 W/cm2 can be advantageously in the order of tens of kHZ due to the use of fibers having a high surface area and the heat removal ensured by the disposition of the fibers in large diameter fiber bundles wherein they are separated from one another to allow circulation of a cooling medium there between. Since the used single mode fiber amplifiers are the same in each amplifier stage, and are tested telecommunication components, the laser pulse generator arrangement and the installation for transmutating nuclear waste can be realised as relatively cheap and compact apparatus which can be moved to locations where it should be used.

Claims

C L A I M S
1. Arrangement for producing a proton beam, characterized in that it is constituted by a laser driven accelerator (1,3) of protons adapted to produce a beam (4) of relativistic protons of 0,5 GeV to 1 GeV with a current in the order of tens of mA, such as a current of 20 mA.
2. Arrangement according to claim 1, characterized in that it comprises a laser pulse source (1) adapted to produce a beam of short pulses (2) having a duration of hundreds of femtoseconds and an intensity greater than 1023 W/cm2 with a high-average power of the order of tens of MW and a proton target (3) on which the laser beam (2) is focused on.
3. Arrangement according to claim 2, characterized in that the duration of the laser pulses is in the order of 30 femtoseconds.
4. Arrangement according to any of claims 2 or 3, characterized in that the high-average power is in the order of 20 MW.
5. Arrangement according to any of claims 2 to 4, characterized in that it comprises a laser pulse oscillator (8) producing ultra-short pulses having a duration in the order tens of femtoseconds and an energy in the order of nanojoules and a single mode optical fiber amplifier device (9) into which the produced laser pulses are fed in, comprising a multitude of optical fibers (14,16,19) in view to form a coherent amplification network system.
6. Arrangement according to claim 5, characterized in that said coherent amplification network system comprises a series of successive amplifier stages (13,15,17) each comprising a bundle of single mode fiber amplifiers, in which the fibers are spaced from one another in view to allow passage of a cooling medium there between, the bundle of one stage comprising fibers which have been obtained by splitting of the fibers of the preceding stage bundle.
7. Arrangement according to claim 6, characterized in that in the downward end the portion of the coherent amplification network, each fiber (19) comprises two fiber sections, an amplifying fiber section (19) belonging to the last amplifier stage (17) in which the fibers are separated from on another for cooling reasons and a transport fiber section (20) made of very low loss fiber, the transport fibers allowing to transform the great diameter bundle of the amplifier stage into a small diameter output bundle (21) where the fibers are kept as close as possible from each other to make the overall output pupil diameter as reduced as possible.
8. Arrangement according to any of claims 2 to 7, characterized in that the proton target (3) is a solid target formed by a film of a substance such as hydrogen, helium or carbon.
9. Arrangement according to any of claims 1 to 8, characterized in that the laser pulses source is adapted to produce laser pulses having a repetition rate in the order of KHz such as 10 KHz.
10. Installation for transmutation of nuclear waste, characterized in that it comprises the arrangement of any of claims 1 to 9 and a spallation target (5) irradiated by the beam of relativistic protons (4) and where neutrons (6) of 0,5 to 1 GeV are spallated from, these neutrons being directed towards the nuclear waste (7) to be transmutated .
11. Installation according to claim 10, characterized in that the spallation target (5) is a liquid target such as a target of Pb-Bi .
12. I nstallation according to claim 11, characterized in that the spallation target (5) comprises an entrance window of high-stress steel and a cylindrical tube (27) filled by a liquid of Pb-Bi alloy, the liquid alloy being used as cooling medium.
PCT/EP2013/068838 2012-09-14 2013-09-11 Arrangement for generating a proton beam and an installation for transmutation of nuclear wastes Ceased WO2014041031A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2015531549A JP6462568B2 (en) 2012-09-14 2013-09-11 Proton beam generator and nuclear waste conversion facility
US14/428,552 US10049778B2 (en) 2012-09-14 2013-09-11 Arrangement for generating a proton beam and an installation for transmutation of nuclear wastes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP12290303.2A EP2709429B1 (en) 2012-09-14 2012-09-14 Arrangement for generating a proton beam and an installation for transmutation of nuclear wastes
EP12290303.2 2012-09-14

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US10395881B2 (en) 2017-10-11 2019-08-27 HIL Applied Medical, Ltd. Systems and methods for providing an ion beam
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