The Experts below are selected from a list of 3 Experts worldwide ranked by ideXlab platform
西内 満美子 - One of the best experts on this subject based on the ideXlab platform.
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Highly charged heavy ion acceleration from a high temperature solid heated by J-KAREN laser system
2019Co-Authors: 西内 満美子, Dover Nicholaspeter, Sakaki Hironao, Kondo Kotaro, Kiriyama Hiromitsu, Kevin Koga James, Alkhimova MariyaAbstract:The interaction of relativistically intense short pulse (~few tens of fs) laser pulse with solid materialgenerates quasi-static electric fields with strengths of > TV/m are produced within a shortdistance of less than m [1]. Thanks to the very strong field gradient, the field can accelerateions beyond MeV within a micron. Unlike the acceleration of low-Z ions, acceleration of thehigh-Z ion is more complicated because charge state distribution should be controlled for pursuinghigher acceleration efficiency or for manipulating a spectral shape of the ions. However, allthe proposed laser-driven acceleration mechanisms, including the most investigated and easy toimplement mechanism, Target Normal Sheath Acceleration (TNSA) [2], are far from being fullyunderstood in the sense of ionization mechanisms. To address this issue, we investigate the ionizationmechanisms in HED plasma produced by a laser pulse of peak intensity ~5x1021 Wcm????2interacting with a silver 500 nm target by using J-KAREN laser system KPSI, QST [3]. Even theJ-KAREN laser is high contrast laser system the pulses show not completely ideal (Gaussian-like)temporal shape. The existence of the rising edge is an inherent feature of high power laser systemsbased on highly non-linear processes and eliminating this rising edge is challenging, even whenapplying pulse cleaning techniques such as plasma mirrors and/or a plasma shutter. The risingedge interacts with target in advance to the main pulse and can prematurely expand the targetresulting in reduction of proton cutoff energies. This is a serious barrier for not only proton acceleration,however we found this temporal shape can be a beneficial effect on heavy ion accelerationfrom the bulk of the target. In the experiment we observed that silver ions with a charge state of~ +40 are accelerated up to ~15 MeV/u with the particle number of (2±1)x106 ion/shot within anenergy range of 10-15 MeV/u. With the help of hydrodynamic, particle-in-cell (PIC) simulationsand analytical estimates, we find out that the ions in the contaminant layer pre-expands and effectivelydetaches from the target, still keeping the target material intact, so that the bulk ionsare exposed to stronger sheath fields and accelerated to higher energies. The highly charged energeticsilver ions are generated via electron collisions in the hot (~6 keV electron temperature) solidplasma. The reported heavy ion acceleration mechanism is in unexplored physical regime, whichhas been generated for the first time via interaction with a laser with an ultra-high intensity usingthe state-of-the-art laser system J-KAREN.Laser-Plasma Accelerator Workshop 2019参
Dover Nicholaspeter - One of the best experts on this subject based on the ideXlab platform.
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Highly charged heavy ion acceleration from a high temperature solid heated by J-KAREN laser system
2019Co-Authors: 西内 満美子, Dover Nicholaspeter, Sakaki Hironao, Kondo Kotaro, Kiriyama Hiromitsu, Kevin Koga James, Alkhimova MariyaAbstract:The interaction of relativistically intense short pulse (~few tens of fs) laser pulse with solid materialgenerates quasi-static electric fields with strengths of > TV/m are produced within a shortdistance of less than m [1]. Thanks to the very strong field gradient, the field can accelerateions beyond MeV within a micron. Unlike the acceleration of low-Z ions, acceleration of thehigh-Z ion is more complicated because charge state distribution should be controlled for pursuinghigher acceleration efficiency or for manipulating a spectral shape of the ions. However, allthe proposed laser-driven acceleration mechanisms, including the most investigated and easy toimplement mechanism, Target Normal Sheath Acceleration (TNSA) [2], are far from being fullyunderstood in the sense of ionization mechanisms. To address this issue, we investigate the ionizationmechanisms in HED plasma produced by a laser pulse of peak intensity ~5x1021 Wcm????2interacting with a silver 500 nm target by using J-KAREN laser system KPSI, QST [3]. Even theJ-KAREN laser is high contrast laser system the pulses show not completely ideal (Gaussian-like)temporal shape. The existence of the rising edge is an inherent feature of high power laser systemsbased on highly non-linear processes and eliminating this rising edge is challenging, even whenapplying pulse cleaning techniques such as plasma mirrors and/or a plasma shutter. The risingedge interacts with target in advance to the main pulse and can prematurely expand the targetresulting in reduction of proton cutoff energies. This is a serious barrier for not only proton acceleration,however we found this temporal shape can be a beneficial effect on heavy ion accelerationfrom the bulk of the target. In the experiment we observed that silver ions with a charge state of~ +40 are accelerated up to ~15 MeV/u with the particle number of (2±1)x106 ion/shot within anenergy range of 10-15 MeV/u. With the help of hydrodynamic, particle-in-cell (PIC) simulationsand analytical estimates, we find out that the ions in the contaminant layer pre-expands and effectivelydetaches from the target, still keeping the target material intact, so that the bulk ionsare exposed to stronger sheath fields and accelerated to higher energies. The highly charged energeticsilver ions are generated via electron collisions in the hot (~6 keV electron temperature) solidplasma. The reported heavy ion acceleration mechanism is in unexplored physical regime, whichhas been generated for the first time via interaction with a laser with an ultra-high intensity usingthe state-of-the-art laser system J-KAREN.Laser-Plasma Accelerator Workshop 2019参
Sakaki Hironao - One of the best experts on this subject based on the ideXlab platform.
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Highly charged heavy ion acceleration from a high temperature solid heated by J-KAREN laser system
2019Co-Authors: 西内 満美子, Dover Nicholaspeter, Sakaki Hironao, Kondo Kotaro, Kiriyama Hiromitsu, Kevin Koga James, Alkhimova MariyaAbstract:The interaction of relativistically intense short pulse (~few tens of fs) laser pulse with solid materialgenerates quasi-static electric fields with strengths of > TV/m are produced within a shortdistance of less than m [1]. Thanks to the very strong field gradient, the field can accelerateions beyond MeV within a micron. Unlike the acceleration of low-Z ions, acceleration of thehigh-Z ion is more complicated because charge state distribution should be controlled for pursuinghigher acceleration efficiency or for manipulating a spectral shape of the ions. However, allthe proposed laser-driven acceleration mechanisms, including the most investigated and easy toimplement mechanism, Target Normal Sheath Acceleration (TNSA) [2], are far from being fullyunderstood in the sense of ionization mechanisms. To address this issue, we investigate the ionizationmechanisms in HED plasma produced by a laser pulse of peak intensity ~5x1021 Wcm????2interacting with a silver 500 nm target by using J-KAREN laser system KPSI, QST [3]. Even theJ-KAREN laser is high contrast laser system the pulses show not completely ideal (Gaussian-like)temporal shape. The existence of the rising edge is an inherent feature of high power laser systemsbased on highly non-linear processes and eliminating this rising edge is challenging, even whenapplying pulse cleaning techniques such as plasma mirrors and/or a plasma shutter. The risingedge interacts with target in advance to the main pulse and can prematurely expand the targetresulting in reduction of proton cutoff energies. This is a serious barrier for not only proton acceleration,however we found this temporal shape can be a beneficial effect on heavy ion accelerationfrom the bulk of the target. In the experiment we observed that silver ions with a charge state of~ +40 are accelerated up to ~15 MeV/u with the particle number of (2±1)x106 ion/shot within anenergy range of 10-15 MeV/u. With the help of hydrodynamic, particle-in-cell (PIC) simulationsand analytical estimates, we find out that the ions in the contaminant layer pre-expands and effectivelydetaches from the target, still keeping the target material intact, so that the bulk ionsare exposed to stronger sheath fields and accelerated to higher energies. The highly charged energeticsilver ions are generated via electron collisions in the hot (~6 keV electron temperature) solidplasma. The reported heavy ion acceleration mechanism is in unexplored physical regime, whichhas been generated for the first time via interaction with a laser with an ultra-high intensity usingthe state-of-the-art laser system J-KAREN.Laser-Plasma Accelerator Workshop 2019参
Kondo Kotaro - One of the best experts on this subject based on the ideXlab platform.
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Highly charged heavy ion acceleration from a high temperature solid heated by J-KAREN laser system
2019Co-Authors: 西内 満美子, Dover Nicholaspeter, Sakaki Hironao, Kondo Kotaro, Kiriyama Hiromitsu, Kevin Koga James, Alkhimova MariyaAbstract:The interaction of relativistically intense short pulse (~few tens of fs) laser pulse with solid materialgenerates quasi-static electric fields with strengths of > TV/m are produced within a shortdistance of less than m [1]. Thanks to the very strong field gradient, the field can accelerateions beyond MeV within a micron. Unlike the acceleration of low-Z ions, acceleration of thehigh-Z ion is more complicated because charge state distribution should be controlled for pursuinghigher acceleration efficiency or for manipulating a spectral shape of the ions. However, allthe proposed laser-driven acceleration mechanisms, including the most investigated and easy toimplement mechanism, Target Normal Sheath Acceleration (TNSA) [2], are far from being fullyunderstood in the sense of ionization mechanisms. To address this issue, we investigate the ionizationmechanisms in HED plasma produced by a laser pulse of peak intensity ~5x1021 Wcm????2interacting with a silver 500 nm target by using J-KAREN laser system KPSI, QST [3]. Even theJ-KAREN laser is high contrast laser system the pulses show not completely ideal (Gaussian-like)temporal shape. The existence of the rising edge is an inherent feature of high power laser systemsbased on highly non-linear processes and eliminating this rising edge is challenging, even whenapplying pulse cleaning techniques such as plasma mirrors and/or a plasma shutter. The risingedge interacts with target in advance to the main pulse and can prematurely expand the targetresulting in reduction of proton cutoff energies. This is a serious barrier for not only proton acceleration,however we found this temporal shape can be a beneficial effect on heavy ion accelerationfrom the bulk of the target. In the experiment we observed that silver ions with a charge state of~ +40 are accelerated up to ~15 MeV/u with the particle number of (2±1)x106 ion/shot within anenergy range of 10-15 MeV/u. With the help of hydrodynamic, particle-in-cell (PIC) simulationsand analytical estimates, we find out that the ions in the contaminant layer pre-expands and effectivelydetaches from the target, still keeping the target material intact, so that the bulk ionsare exposed to stronger sheath fields and accelerated to higher energies. The highly charged energeticsilver ions are generated via electron collisions in the hot (~6 keV electron temperature) solidplasma. The reported heavy ion acceleration mechanism is in unexplored physical regime, whichhas been generated for the first time via interaction with a laser with an ultra-high intensity usingthe state-of-the-art laser system J-KAREN.Laser-Plasma Accelerator Workshop 2019参
Kiriyama Hiromitsu - One of the best experts on this subject based on the ideXlab platform.
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Highly charged heavy ion acceleration from a high temperature solid heated by J-KAREN laser system
2019Co-Authors: 西内 満美子, Dover Nicholaspeter, Sakaki Hironao, Kondo Kotaro, Kiriyama Hiromitsu, Kevin Koga James, Alkhimova MariyaAbstract:The interaction of relativistically intense short pulse (~few tens of fs) laser pulse with solid materialgenerates quasi-static electric fields with strengths of > TV/m are produced within a shortdistance of less than m [1]. Thanks to the very strong field gradient, the field can accelerateions beyond MeV within a micron. Unlike the acceleration of low-Z ions, acceleration of thehigh-Z ion is more complicated because charge state distribution should be controlled for pursuinghigher acceleration efficiency or for manipulating a spectral shape of the ions. However, allthe proposed laser-driven acceleration mechanisms, including the most investigated and easy toimplement mechanism, Target Normal Sheath Acceleration (TNSA) [2], are far from being fullyunderstood in the sense of ionization mechanisms. To address this issue, we investigate the ionizationmechanisms in HED plasma produced by a laser pulse of peak intensity ~5x1021 Wcm????2interacting with a silver 500 nm target by using J-KAREN laser system KPSI, QST [3]. Even theJ-KAREN laser is high contrast laser system the pulses show not completely ideal (Gaussian-like)temporal shape. The existence of the rising edge is an inherent feature of high power laser systemsbased on highly non-linear processes and eliminating this rising edge is challenging, even whenapplying pulse cleaning techniques such as plasma mirrors and/or a plasma shutter. The risingedge interacts with target in advance to the main pulse and can prematurely expand the targetresulting in reduction of proton cutoff energies. This is a serious barrier for not only proton acceleration,however we found this temporal shape can be a beneficial effect on heavy ion accelerationfrom the bulk of the target. In the experiment we observed that silver ions with a charge state of~ +40 are accelerated up to ~15 MeV/u with the particle number of (2±1)x106 ion/shot within anenergy range of 10-15 MeV/u. With the help of hydrodynamic, particle-in-cell (PIC) simulationsand analytical estimates, we find out that the ions in the contaminant layer pre-expands and effectivelydetaches from the target, still keeping the target material intact, so that the bulk ionsare exposed to stronger sheath fields and accelerated to higher energies. The highly charged energeticsilver ions are generated via electron collisions in the hot (~6 keV electron temperature) solidplasma. The reported heavy ion acceleration mechanism is in unexplored physical regime, whichhas been generated for the first time via interaction with a laser with an ultra-high intensity usingthe state-of-the-art laser system J-KAREN.Laser-Plasma Accelerator Workshop 2019参
