T. Kanesue

Brookhaven National Laboratory, New York, New York, United States

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Publications (48)42.19 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To realize a heavy-ion inertial fusion (HIF) driver, we have studied a possibility of laser ion source (LIS). A LIS can provide high-current high-brightness heavy-ion beams; however, it was difficult to manipulate the beam parameters. To overcome the issue, we employed a pulsed solenoid in the plasma drift section and investigated the effect of the solenoid field on singly charged iron beams. The rapid ramping magnetic field could enhance limited time slice of the current and simultaneously the beam emittance changed accordingly. This approach may also be useful to realize an ion source for HIF power plant.
    Laser and Particle Beams 06/2015; 33(02):1-5. DOI:10.1017/S026303461500004X · 1.30 Impact Factor
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    ABSTRACT: A Laser ion source (LIS) provides high current heavy ion beams with a very simple mechanical structure. Plasma is produced by a pulsed laser ablation of a solid state target and ions are extracted by an electric field. However, it was difficult to manipulate the beam parameters of a LIS, since the plasma condition could only be adjusted by the laser irradiation condition. To enhance flexibility of LIS operation, we employed a pulsed solenoid in the plasma drift section and investigated the effect of the solenoid field on singly charged iron beams. The experimentally obtained current profile was satisfactorily controlled by the pulsed magnetic field. This approach may also be useful to reduce beam emittance of a LIS.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 05/2015; 795. DOI:10.1016/j.nima.2015.05.030 · 1.22 Impact Factor
  • Takeshi Kanesue · Masahiro Okamura
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    ABSTRACT: In Brookhaven National Laboratory (BNL), we have been developing laser ion sources for diverse accelerators. Tabletop Nd:YAG lasers with up to several Joules of energy are mainly used to create ablation plasmas for stable operations. The obtained charge states depend on laser power density and target species. Two types of ion extraction schemes, direct plasma injection scheme (DPIS) and conventional static extraction, are used depending on the application. We optimized and selected a suitable laser irradiation condition and a beam extraction scheme to meet the requirement of the following accelerator system. We have demonstrated to accelerate more than 5 × 1010 of C6+ ions using the DPIS. We successfully commissioned a low-charge ion beam provider to the user facilities in BNL. To achieve higher current, higher charge state and lower emittance, further studies will continue.
    Radiation Effects and Defects in Solids 04/2015; 170(4). DOI:10.1080/10420150.2015.1036427 · 0.51 Impact Factor
  • Takeshi Kanesue · Yasuhiro Fuwa · Kotaro Kondo · Masahiro Okamura
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    ABSTRACT: Pulse length extension of highly charged ion beam generated from a laser ion source is experimentally demonstrated. The laser ion source (LIS) has been recognized as one of the most powerful heavy ion source. However, it was difficult to provide long pulse beams. By applying a solenoid field (90 mT, 1 m) at plasma drifting section, a pulse length of carbon ion beam reached 3.2 μs which was 4.4 times longer than the width from a conventional LIS. The particle number of carbon ions accelerated by a radio frequency quadrupole linear accelerator was 1.2 × 1011, which was provided by a single 1 J Nd-YAG laser shot. A laser ion source with solenoid field could be used in a next generation heavy ion accelerator.
    Applied Physics Letters 11/2014; 105(19):193506. DOI:10.1063/1.4902021 · 3.30 Impact Factor
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    ABSTRACT: To investigate efficient graphite material for carbon ion production in laser ion source, the plasma properties produced from these materials are measured. Comparing acquired current profile and charge state distribution, the distributions of ions in laser induced plasma from isotropic graphite and single crystal of graphite are different. The produced quantity of C(6+) from isotropic materials is larger than that from single crystal.
    The Review of scientific instruments 02/2014; 85(2):02B924. DOI:10.1063/1.4862210 · 1.61 Impact Factor
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    ABSTRACT: Multiple laser shots could be used to elongate an ion beam pulse width or to intensify beam current from laser ion sources. In order to confirm the feasibility of the multiple shot scheme, we investigated the properties of plasmas produced by double laser shots. We found that when the interval of the laser shots is shorter than 10 μs, the ion current profile had a prominent peak, which is not observed in single laser experiments. The height of this peak was up to five times larger than that of single laser experiment.
    The Review of scientific instruments 02/2014; 85(2):02B916. DOI:10.1063/1.4854255 · 1.61 Impact Factor
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    ABSTRACT: A magnetic field can increase an ion current of a laser ablation plasma and is expected to control the change of the plasma ion current. However, the magnetic field can also make some fluctuations of the plasma and the effect on the beam emittance and the emission surface is not clear. To investigate the effect of a magnetic field, we extracted the ion beams under three conditions where without magnetic field, with magnetic field, and without magnetic field with higher laser energy to measure the beam distribution in phase space. Then we compared the relations between the plasma ion current density into the extraction gap and the Twiss parameters with each condition. We observed the effect of the magnetic field on the emission surface.
    The Review of scientific instruments 02/2014; 85(2):02B919. DOI:10.1063/1.4860650 · 1.61 Impact Factor
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    ABSTRACT: To create mixed species ion beam with laser pulses, we investigated charge state distributions of plasma formed from both Al-Fe alloy targets and pure Al and Fe targets placed close together. With two targets, we observed that the two kinds of atoms were mixed when the interval of two laser pulses was large enough (40 μs). On the other hand, when the interval was 0.0 μs, we observed fewer Fe ions and they did not mix well with the Al ions. The two species were mixed well in the plasma from the alloy target. Furthermore, we observed that specific charge states of Fe ions increased. From the results, it was determined that we can use two pure targets to mix two species whose difference of the drift velocity is large. On the other hand, we must use an alloy target when the drift velocities of the species are close.
    The Review of scientific instruments 02/2014; 85(2):02B913. DOI:10.1063/1.4833015 · 1.61 Impact Factor
  • M Okamura · T Kanesue · T Yamamoto · Y Fuwa
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    ABSTRACT: A new set of vanes of radio frequency quadrupole (RFQ) accelerator was commissioned using highly charged iron beam. To supply high intensity heavy ion beams to the RFQ, direct plasma injection scheme (DPIS) with a confinement solenoid was adopted. One of the difficulties to utilize the combination of DPIS and a solenoid field is a complexity of electro magnetic field at the beam extraction region, since biasing high static electric field for ion extraction, RFQ focusing field, and the solenoid magnetic field fill the same space simultaneously. To mitigate the complexity, a newly designed magnetic field clamps were used. The intense iron beam was observed with bunched structure and the total accelerated current reached 2.5 nC.
    The Review of scientific instruments 02/2014; 85(2):02B907. DOI:10.1063/1.4825163 · 1.61 Impact Factor
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    ABSTRACT: In Brookhaven National Laboratory, laser ion source has been developed to provide heavy ion beams by using plasma generation with 1064 nm Nd:YAG laser irradiation onto solid targets. The laser energy is transferred to the target material and creates a crater on the surface. However, only the partial material can be turned into plasma state and the other portion is considered to be just vaporized. Since heat propagation in the target material requires more than typical laser irradiation period, which is typically several ns, only the certain depth of the layers may contribute to form the plasma. As a result, the depth is more than 500 nm because the base material Al ions were detected. On the other hand, the result of comparing each carbon thickness case suggests that the surface carbon layer is not contributed to generate plasma.
    The Review of scientific instruments 02/2014; 85(2):02B925. DOI:10.1063/1.4862660 · 1.61 Impact Factor
  • M Sekine · S Ikeda · N Hayashizaki · T Kanesue · M Okamura
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    ABSTRACT: Extracted ion beams from the test laser ion source (LIS) were transported through a test beam transport line which is almost identical to the actual primary beam transport in the current electron beam ion source apparatus. The tested species were C, Al, Si, Cr, Fe, Cu, Ag, Ta, and Au. The all measured beam currents fulfilled the requirements. However, in the case of light mass ions, the recorded emittance shapes have larger aberrations and the RMS values are higher than 0.06 π mm mrad, which is the design goal. Since we have margin to enhance the beam current, if we then allow some beam losses at the injection point, the number of the single charged ions within the acceptance can be supplied. For heaver ions like Ag, Ta, and Au, the LIS showed very good performance.
    The Review of scientific instruments 02/2014; 85(2):02B920. DOI:10.1063/1.4854876 · 1.61 Impact Factor
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    ABSTRACT: Laser ion source (LIS) is one of the promising candidates for the front end of heavy ion inertial fusion power plant. A LIS can provide low emittance high current heavy ion beams. Based on the performance of an existing LIS, the feasibilities of the ion source of heavy ion inertial fusion plant are investigated assuming both induction accelerator scheme and radio frequency (RF) accelerator scheme. By combining recently developed techniques, we can design LIS both for the induction and RF accelerator schemes.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2014; DOI:10.1016/j.nima.2013.10.026 · 1.22 Impact Factor
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    K. Kondo · T Kanesue · M. Okamura
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    ABSTRACT: Warm Dense Matter (WDM) is a challenging science field, which is related to heavy ion inertial fusion and planetary science. It is difficult to expect the behavior because the state with high density and low temperature is completely different from ideal condition. The well-defined WDM generation is required to understand it. Moderate energy ion beams ( MeV/u) slightly above Bragg peak is an advantageous method for WDM because of the uniform energy deposition. Direct Plasma Injection Scheme (DPIS) with a Interdigital H-mode (IH) accelerator has a potential for the beam parameter. We show feasible parameters of the IH accelerator for WDM. WDM physics is a challenging science and is strongly related to Heavy Ion Fusion science. WDM formation by Direct Plasma Injection Scheme (DPIS) with IH accelerator, which is a compact system, is proposed. Feasible parameters for IH accelerator are shown for WDM state. These represents that DPIS with IH accelerator can access a different parameter region of WDM.
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    K. Kondo · T. Kanesue · J. Tamura · R. Dabrowski · M. Okamura
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    ABSTRACT: Laser ion source (LIS) is a candidate among various heavy ion sources. A high density plasma produced by Nd:yttrium aluminum garnet laser with drift velocity realizes high current and high charge state ion beams. In order to obtain higher beam current, we made experiments using the LIS with a magnetic field by which a confinement effect can make higher beam current. We measured total current by Faraday cup and analyzed charge distribution by electrostatic ion analyzer. It is shown that the ion beam charge state is higher by a permanent magnet.
    Review of Scientific Instruments 03/2010; 81(2-81):02B716 - 02B716-3. DOI:10.1063/1.3290860 · 1.61 Impact Factor
  • T Kanesue · M Okamura · K Kondo · J Tamura · H Kashiwagi · Z Zhang
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    ABSTRACT: In a laser ion source, plasma drift distance is one of the most important design parameters. Ion current density and beam pulse width are defined by plasma drift distance between a laser target and beam extraction position. In direct plasma injection scheme, which uses a laser ion source and a radio frequency quadrupole linac, we can apply relatively higher electric field at beam extraction due to the unique shape of a positively biased electrode. However, when we aim at very high current acceleration such as several tens of milliamperes, we observed mismatched beam extraction conditions. We tested three different ion current at ion extraction region by changing plasma drift distance to study better extraction condition. In this experiment, C(6+) beam was accelerated. We confirmed that matching condition can be improved by controlling plasma drift distance.
    The Review of scientific instruments 02/2010; 81(2):02B723. DOI:10.1063/1.3298845 · 1.61 Impact Factor
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    ABSTRACT: We have been investigating direct plasma injection scheme (DPIS) for high-intensity heavy-ion beam acceleration. In the DPIS, laser-produced plasma is directly injected into a radio frequency quadrupole (RFQ) linac. To study the beam dynamics of the ion injection in the DPIS, we tracked particle motions in the RFQ matching section using three-dimensional particle-in-cell method. As a result of the numerical simulation, we found that the electrostatic field generated by the extraction electrode reduces the transmission efficiency. To avoid the radially defocusing force, the input beam into the RFQ has to be initially convergent. In the DPIS, further optimization of the plasma density is required for better matching.
    The Review of scientific instruments 02/2010; 81(2):02B726. DOI:10.1063/1.3318208 · 1.61 Impact Factor
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    M Okamura · A Adeyemi · T Kanesue · J Tamura · K Kondo · R Dabrowski
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    ABSTRACT: A laser ion source (LIS) can easily provide a high current beam. However, it has been difficult to obtain a longer beam pulse while keeping a high current. On occasion, longer beam pulses are required by certain applications. For example, more than 10 micros of beam pulse is required for injecting highly charged beams to a large sized synchrotron. To extend beam pulse width, a solenoid field was applied at the drift space of the LIS at Brookhaven National Laboratory. The solenoid field suppressed the diverging angle of the expanding plasma and the beam pulse was widened. Also, it was observed that the plasma state was conserved after passing through a few hundred gauss of the 480 mm length solenoid field.
    The Review of scientific instruments 02/2010; 81(2):02A510. DOI:10.1063/1.3267312 · 1.61 Impact Factor
  • K Kondo · T Kanesue · J Tamura · M Okamura
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    ABSTRACT: Brookhaven National Laboratory has developed the new preinjector system, electron beam ion source (EBIS) for relativistic heavy ion collider (RHIC) and National Aeronautics and Space Administration Space Radiation Laboratory. Design of primary ion provider is an essential problem since it is required to supply beams with different ion species to multiple users simultaneously. The laser ion source with a defocused laser can provide a low charge state and low emittance ion beam, and is a candidate for the primary ion source for RHIC-EBIS. We show a suitable design with appropriate drift length and solenoid, which helps to keep sufficient total charge number with longer pulse length. The whole design of primary ion source, as well as optics arrangement, solid targets configuration and heating about target, is presented.
    The Review of scientific instruments 02/2010; 81(2):02A511. DOI:10.1063/1.3292941 · 1.61 Impact Factor
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    K. Kondo · T. Kanesue · K. Horioka · M. Okamura
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    ABSTRACT: Warm Dense Matter (WDM) offers an challenging problem because WDM, which is beyond ideal plasma, is in a low temperature and high density state with partially degenerate electrons and coupled ions. WDM is a common state of matter in astrophysical objects such as cores of giant planets and white dwarfs. The WDM studies require large energy deposition into a small target volume in a shorter time than the hydrodynamical time and need uniformity across the full thickness of the target. Since moderate energy ion beams ( 0.3 MeV/u) can be useful tool for WDM physics, we propose WDM generation using Direct Plasma Injection Scheme (DPIS). In the DPIS, laser ion source is connected to the Radio Frequency Quadrupole (RFQ) linear accelerator directly without the beam transport line. DPIS with a realistic final focus and a linear accelerator can produce WDM.

Publication Stats

62 Citations
42.19 Total Impact Points


  • 2014–2015
    • Brookhaven National Laboratory
      New York, New York, United States
    • Goethe-Universität Frankfurt am Main
      • Institute of Applied Physics
      Frankfurt, Hesse, Germany
  • 2008–2010
    • RIKEN
      Вако, Saitama, Japan
  • 2006–2010
    • Kyushu University
      • Department of Applied Quantum Physics and Nuclear Engineering
      Hukuoka, Fukuoka, Japan
  • 2007
    • Saitama Institute of Technology
      Edo, Tōkyō, Japan
  • 2
    • Japan Atomic Energy Agency
      Muramatsu, Niigata, Japan