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  1. Article ; Online: Quasimonoenergetic Proton Bunch Acceleration Driven by Hemispherically Converging Collisionless Shock in a Hydrogen Cluster Coupled with Relativistically Induced Transparency.

    Matsui, Ryutaro / Fukuda, Yuji / Kishimoto, Yasuaki

    Physical review letters

    2019  Volume 122, Issue 1, Page(s) 14804

    Abstract: An approach for accelerating a quasimonoenergetic proton bunch via a hemispherically converging collisionless shock created in laser-cluster interactions at the relativistically induced transparency (RIT) regime is studied using three-dimensional ... ...

    Abstract An approach for accelerating a quasimonoenergetic proton bunch via a hemispherically converging collisionless shock created in laser-cluster interactions at the relativistically induced transparency (RIT) regime is studied using three-dimensional particle-in-cell simulations. By the action of focusing a petawatt class laser pulse onto a micron-size spherical hydrogen cluster, a crescent-shaped collisionless shock is launched at the laser-irradiated hemisphere and propagates inward. The shock converges at the sphere center in concurrence with the onset of the RIT, thereby allowing the proton bunch to be pushed out from the shock surface in the laser propagation direction. The proton bunch experiences further acceleration both inside and outside of the cluster to finally exhibit a quasimonoenergetic spectral peak around 300 MeV while maintaining a narrow energy spread (∼10%) and a small half-divergence angle (∼5°) via the effect of the RIT. This mechanism works for finite ranges of parameters with threshold values concerning the laser peak intensity and the cluster radius, resulting from the synchronization of the multiple processes in a self-consistent manner. The present scheme utilizing the internal and external degrees of freedom ascribed to the spherical cluster leads to the proton bunch alternative to the plain target, which allows the operation with a high repetition rate and impurity free.
    Language English
    Publishing date 2019-04-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.122.014804
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Dynamics of the boundary layer created by the explosion of a dense object in an ambient dilute gas triggered by a high power laser.

    Matsui, Ryutaro / Fukuda, Yuji / Kishimoto, Yasuaki

    Physical review. E

    2019  Volume 100, Issue 1-1, Page(s) 13203

    Abstract: The dynamics of the boundary layer in between two distinct collisionless plasmas created by the interaction between a dense object modeling a cluster and a short laser pulse in the presence of an ambient gas is studied with two dimensional relativistic ... ...

    Abstract The dynamics of the boundary layer in between two distinct collisionless plasmas created by the interaction between a dense object modeling a cluster and a short laser pulse in the presence of an ambient gas is studied with two dimensional relativistic particle-in-cell simulations, which are found to be described by three successive processes. In the first phase, a collisionless electrostatic shock wave, launched near the cluster expansion front, reflects the ambient gas ions at a contact surface as a moving wall, which allows a particle acceleration with a narrower energy spread. In the second phase, the contact surface disappears and the compressed surface of the ambient gas ions passes over the shock potential, forming an overlapping region between the cluster expansion front and the compressed surface of the ambient gas. Here, another type of nonlinear wave is found to be evolved, leading to a relaxation of the shock structure, while continuing to reflect the ambient gas ions. The nonlinear wave exhibits a bipolar electric field structure that is sustained for a long timescale coupled with slowly evolving ion dynamics, suggesting that a quasistationary kinetic equilibrium dominated by electron vortices in the phase space is established. In the third phase, a rarefaction wave is triggered and evolves at the compressed surface of ambient gas. This is because some of the ambient gas ions tend to pass over the potential of the bipolar electric field. Simultaneously, a staircase structure, i.e., a kind of internal shock, is formed in the cluster due to the deceleration of cluster ions. Such structure formations and successive dynamics accompanied by the transitions from the shock wave phase through the overlapping phase to the rarefaction wave phase are considered to be a unique nature at the boundary layer created by an explosion of a dense plasma object in an ambient dilute plasma.
    Language English
    Publishing date 2019-08-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.100.013203
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Laser-driven multi-MeV high-purity proton acceleration via anisotropic ambipolar expansion of micron-scale hydrogen clusters.

    Jinno, Satoshi / Kanasaki, Masato / Asai, Takafumi / Matsui, Ryutaro / Pirozhkov, Alexander S / Ogura, Koichi / Sagisaka, Akito / Miyasaka, Yasuhiro / Nakanii, Nobuhiko / Kando, Masaki / Kitagawa, Nobuko / Morishima, Kunihiro / Kodaira, Satoshi / Kishimoto, Yasuaki / Yamauchi, Tomoya / Uesaka, Mitsuru / Kiriyama, Hiromitsu / Fukuda, Yuji

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 16753

    Abstract: Multi-MeV high-purity proton acceleration by using a hydrogen cluster target irradiated with repetitive, relativistic intensity laser pulses has been demonstrated. Statistical analysis of hundreds of data sets highlights the existence of markedly high ... ...

    Abstract Multi-MeV high-purity proton acceleration by using a hydrogen cluster target irradiated with repetitive, relativistic intensity laser pulses has been demonstrated. Statistical analysis of hundreds of data sets highlights the existence of markedly high energy protons produced from the laser-irradiated clusters with micron-scale diameters. The spatial distribution of the accelerated protons is found to be anisotropic, where the higher energy protons are preferentially accelerated along the laser propagation direction due to the relativistic effect. These features are supported by three-dimensional (3D) particle-in-cell (PIC) simulations, which show that directional, higher energy protons are generated via the anisotropic ambipolar expansion of the micron-scale clusters. The number of protons accelerating along the laser propagation direction is found to be as high as 1.6 [Formula: see text] [Formula: see text] 10[Formula: see text]/MeV/sr/shot with an energy of 2.8 [Formula: see text] MeV, indicating that laser-driven proton acceleration using the micron-scale hydrogen clusters is promising as a compact, repetitive, multi-MeV high-purity proton source for various applications.
    Language English
    Publishing date 2022-10-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-18710-x
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  4. Article ; Online: Functional characteristics of a renal H

    Matsui, Ryutaro / Hattori, Ryutaro / Usami, Youhei / Koyama, Masumi / Hirayama, Yuki / Matsuba, Emi / Hashimoto, Yukiya

    Drug metabolism and pharmacokinetics

    2017  Volume 33, Issue 1, Page(s) 96–102

    Abstract: We have recently found an ... ...

    Abstract We have recently found an H
    MeSH term(s) Animals ; Biological Transport/physiology ; Cation Transport Proteins/metabolism ; Dogs ; Hydrophobic and Hydrophilic Interactions ; Ion Transport/physiology ; Kidney/metabolism ; LLC-PK1 Cells ; Madin Darby Canine Kidney Cells ; Proton Pumps/metabolism ; Quinidine/metabolism ; Rats ; Rats, Wistar ; Swine
    Chemical Substances Cation Transport Proteins ; Proton Pumps ; Quinidine (ITX08688JL)
    Language English
    Publishing date 2017-12-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2095748-8
    ISSN 1880-0920 ; 1347-4367 ; 0916-1139
    ISSN (online) 1880-0920
    ISSN 1347-4367 ; 0916-1139
    DOI 10.1016/j.dmpk.2017.11.313
    Database MEDical Literature Analysis and Retrieval System OnLINE

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