Focusing and spectral enhancement of a repetition-rated, laser-driven, divergent multi-MeV proton beam using permanent quadrupole magnets

Nishiuchi, Mamiko; Daito, I.; Ikegami, Machiko; Daido, Hiroyuki; Mori, M.; Orimo, Satoshi; Ogura, Koichi; Sagisaka, A.; Yogo, Akifumi; Pirozhkov, Alexander S.; Sugiyama, Hironori; Kiriyama, Hiromitsu; Okada, Hiroshi; Kanazawa, S.; Kondo, Shuji; Shimomura, Takuya; Tanoue, Manabu; Nakai, Yoshiki; Sasao, H.; Wakai, Daisuke; Sakaki, H.; Bolton, Paul R.; Choi, Il Woo; Sung, Jae Hee; Lee, J.; Oishi, Yuji; Fujii, Takashi; Nemoto, Koshichi; Souda, Hikaru; Noda, Akira; Iseki, Y.; Yoshiyuki, T.

doi:10.1063/1.3078291

Cited by 72 publications

(51 citation statements)

References 16 publications

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“…In particular, we performed irradiation of biological samples (the human lung cancer cells) and delivered the lethal dose of 20 Gy in 200 shots, which was confirmed by the DNA double strand break revealed by the phosphorylated histone H2AX immunostaining method. [26] We also demonstrated focusing of the proton beam by a pair of wide acceptance-angle permanent magnet quadrupoles; [27] at the distance of 650 mm from the target, the protons with the quasi-monochromatic spectrum near 2.4 MeV formed a 3 mm × 8 mm spot. We also demonstrated the repetitive generation of quasi-monochromatic proton energy spectra with δE p /E p ≈ 1.6% employing the phase rotation method.…”

Section: Results Of Proton Accelerationmentioning

confidence: 98%

Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser

et al. 2009

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We describe results of experiments on laser-driven proton acceleration and corresponding laser-plasma diagnostics performed with the multi-10-TW J-KAREN laser. The laser consists of a high-pulse-energy oscillator, saturable absorber, stretcher, Optical Parametric Chirped Pulse Amplifier (OPCPA), two 4-pass Ti:Sapphire amplifiers, and compressor. The final amplifier is cryogenically cooled down to 100 K to avoid thermal lensing. The laser provides ~30 fs, ~ 1 J, high-contrast pulses with the nanosecond contrast better than 10 10 . The peak intensity is 10 20 W/cm 2 with the 3-4 μm focal spot. Using few-μm tape and sub-μm ribbon targets we produced protons with the energies up to 4 MeV. The tape target and repetitive laser operation allowed achieving proton acceleration at 1 Hz. We found significant differences in stability and angular distribution of proton beam in high-contrast and normal-contrast modes. The plasma diagnostics included interferometry and measurement of the target reflectivity. The latter provides convenient diagnostics of the laser contrast in the ion acceleration, harmonics generation, and other laser -solid target interaction experiments.

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Section: Results Of Proton Accelerationmentioning

confidence: 98%

Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser

et al. 2009

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“…The coupling of magnetic lenses with laser accelerators has previously been accomplished with permanent magnet quadrupoles (PMQs) where the capture of electrons [10] and protons [11,12] were demonstrated. Although PMQs are widely used in conventional accelerator beam lines to correct paraxial beams with small divergences, their magnetic field is on the order of 1 T and therefore cannot sufficiently capture highly divergent protons of more than a few MeV, let alone the 250 MeV protons necessary for proton therapy.…”

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Laser accelerated protons captured and transported by a pulse power solenoid

Burris-Mog

Harres

Nürnberg

et al. 2011

Phys. Rev. ST Accel. Beams

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Using a pulse power solenoid, we demonstrate efficient capture of laser accelerated proton beams and the ability to control their large divergence angles and broad energy range. Simulations using measured data for the input parameters give inference into the phase-space and transport efficiencies of the captured proton beams. We conclude with results from a feasibility study of a pulse power compact achromatic gantry concept. Using a scaled target normal sheath acceleration spectrum, we present simulation results of the available spectrum after transport through the gantry.

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“…Several methods have been demonstrated so far in order to reduce the beam divergence of a selected narrow part of the proton spectrum. They mainly employ permanent magnet quadrupoles [5][6][7] or a compact ion lens driven by a secondary laser beam [8], and the shaped target scheme exploiting the target self-charging during interaction [9]. However, it is not clear yet how these schemes could be extrapolated for a desirable performance in a FI scenario, where one would require the full flux of the beam to be concentrated at a small (order of mm) distance from the source.…”

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Ballistic Focusing of Polyenergetic Protons Driven by Petawatt Laser Pulses

et al. 2011

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By using a thick (250 μm) target with 350 μm radius of curvature, the intense proton beam driven by a petawatt laser is focused at a distance of ∼1 mm from the target for all detectable energies up to ∼25 MeV. The thickness of the foil facilitates beam focusing as it suppresses the dynamic evolution of the beam divergence caused by peaked electron flux distribution at the target rear side. In addition, reduction in inherent beam divergence due to the target thickness relaxes the curvature requirement for short-range focusing. Energy resolved mapping of the proton beam trajectories from mesh radiographs infers the focusing and the data agree with a simple geometrical modeling based on ballistic beam propagation.

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Focusing and spectral enhancement of a repetition-rated, laser-driven, divergent multi-MeV proton beam using permanent quadrupole magnets

Cited by 72 publications

References 16 publications

Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser

Laser-driven proton acceleration and plasma diagnostics with J-KAREN laser

Laser accelerated protons captured and transported by a pulse power solenoid

Ballistic Focusing of Polyenergetic Protons Driven by Petawatt Laser Pulses

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