ILE
April 202

- March 20221,2,

1,
2,

3,

3,

5,

5,

1)

1,

1,

1,

1,

2,

2,

2,

3,

3,

3,

4,

6, Pan Yiming6,

, 2)
6)

1,
3,

, 7)

, 8)

3,

4,
8,

, 3)

4,
9,

, 5)

5 Torr
HIPER

3.6 T

13

4.7 T
B-dot

(FIG)
FIG.
25.5 ns(

3.6 T (y

)
(TCC)

)

(

)

3,
4,
10 ,

SUMMARY

XII

2,

4,

9,

, 4)
, 10)

, 9)

2,

3,

4,
7,

2,

2

,

Collimated charged particles generation with accompanied magnetic field
B. Zhu1, Y. Abe1, Z. Zhang2, M. Takemura1, Y. Zhang2, L. Cheng2, X. Yuan3, S. Guo1, Z. Lan1, A. Morace1, A. Nakao1, R.
Takizawa1, C. Liu1, H. Morita1, A. Yogo1, Y. Arikawa1, M. Nakai1, H. Shiraga1, Y. Li2, S. Fujioka1
1) Institute of Laser Engine, Osaka University, Japan , 2) Institute of Physics, CAS, 3) MoE, Shanghai Jiao Tong Univ., 4)
NIFS
SUMMARY

We proposed a novel idea to produce acollimated charged particle beam with apulsed-magnetic field generated byrelativistic picosecond lasers. A kilo-teslalevel magnetic field is generated withhigher energy conversion efficiency due
to hot electron flow current in 2020. The
divergences of proton beams aresuppressed by the simultaneouslygenerated strong magnetic fields. In 2021,
the dependence of B-field strength onlaser energy was studied. A foil with aseparated coil target was used todemonstrate the coil wire itself was not
dominant in proton confinement. In
addition, we found that the foil with tube
target could diverge the protons andconfine the electrons.

Foil w/
separated
coil

Foil w/connected
coil

(a)

(b)

(c)

(d)

FIG. (a) The schematic of the experiments. (b) Proton pattern comparison.
(c) The dependence of B field strength on laser energy. (d) The proton andelectron results of foil w/ cone targets.

Empirical research of self-reformation of collisionless shock
S. Matsukiyo1, S. Isayama1, T. Morita1, T. Takezaki2, Y. Kuramitsu3, R. Yamazaki4, S. J. Tanaka4, K. Tomita5, T. Sano6, H.
Luo1, R. Higashi1, K. Takahashi1, S. Matsuo1, T. Kojima1, T. Oguchi2, S. Kato2, T. Minami3, K. Sakai3, T. Nishimoto3, A.
Iwasaki3, K. Himeno3, T. Taguchi3, S. Owada3, S. Suzuki3, K. Aihara4, Y. Sato4, J. Shiota4, A. Takada4, K. Matsui4, P.
Yiming5, S. Egashira6, M. Ohta6, H. Ishihara6, O. Kuramoto6, Y. Matsumoto6, K. Maeda6, Y. Sakawa6
1) Kyushu University, Japan, 2) University of Toyama, Japan, 3) Osaka University, 4) Aoyama Gakuin University,5) Hokkaido University, 6) Institute of Laser Engineering, Osaka University, JapanSUMMARY
The self-reformation of a collisionless shock is believed
to be responsible for an energy dissipation including
wave generation as well as particle acceleration at acollisionless shock. A high power laser experiment was
conducted to empirically demonstrate the shockreformation. An ambient magnetic field is necessary to
be applied in wide region of space to magnetize thesurrounding gas plasma. The maximum ambient
magnetic field of B = 4~6.5T was successfully appliedby using a Helmholtz coil (FIG.A and FIG.B). The
physical parameters of the created shock were measured
by self-emission gated optical image intensifier,streaked optical pyrometer, framing camera (FIG C),
and Thomson scattering measurement. The long time
evolution of the system up to t ~ 140ns was captured forthe first time to show that the shock is still developing
and the unanticipated collimated structure appears in thefront edge of the compressed gas plasma in later time.

B

A
C
5.4T
70ns

80ns

90ns

100ns

80ns

90ns

100ns

6.5T
70ns

FIG. A) The holder of magnetic coil and a number of lightpaths. B) Photo of the magnetic coil system after electric
insulating treatment. C) Self-emission intensity evolutions for
B=5.4T and 6.5T obtained from the framing camera.

Investigation of the structure and rate of a laser-driven magnetic reconnection
T. Morita1, S. Matsuo1, T. Kojima1, S. Matsukiyo1, S. Isayama1, R. Yamazaki2, S. J. Tanaka2, K. Aihara2, Y. Sato2,
J. Shiota2, A. Takata2, Y. Pan1, K. Tomita3 , T. Takezaki4, Y. Kuramitsu5, K. Sakai5, S. Egashira5, H. Ishihara5,
O. Kuramoto5, Y. Matsumoto5, K. Maeda5, and Y. Sakawa5
1) Kyushu University, Japan, 2) Aoyama-gakuin University, Japan, 2) Aoyama-gakuin University, Japan, 3) Hokkaido
University, Japan, 4) Toyama University, Japan, 5) Osaka University, Japan,
SUMMARY

(f)

(g)

(f)

(h)
LFEX
(i)
2020

2019

7, (d) 9 ns)
t=3 ns, (g) 7 ns) (h,i)((a) t=4, (b) 5, (c)((f)

Studying the interplay between shocks and magnetic fields in the Universe
P. Mabey1, B. Albertazzi2, Y. Sakawa3, T. Morita4, S. Matsukiyo4, S. Isayama4 R. Yamazaki5, S. Tanaka5, T. Takezaki6, K.
Tomita7, T. Sano3. Y. Kuramitsu3, M. Koenig2
1) Freie Universitaet Berlin, Germany, 2) LULI, France 3) University of Osaka, Japan, 4) Kyushu University, Japan, 5)
Aoyama Gakuin University, Japan, 6) Toyama University, Japan, 7) Hokkaido University, JapanSUMMARY

Magnetic fields are ubiquitous in the Universe and may
have an influence on any number of celestial objects aswell as the medium between them. However
astronomical observations using techniques such as
Faraday rotation or Zeeman splitting are unable toresolve smaller scale structures within the magnetic
field. For example, a supernova remnant expanding in
the interstellar medium will compress the ambient
magnetic field. However, this compression factor rate is
unknown. Here we performed a scaled laboratory
experiment to help answer this question, in which a
blast wave expands under the influence of a uniform
magnetic field. Optical diagnostics such as
interferometry and SOP were used to track the
dynamics of the system.
FIG. Cut-away of experimental setup at the GEKKO XII laser
facility.

1,

1)

1,2,

3,

4,

2

, 2)
3)

,
, 4)

SUMMARY

2020 12(

J-KAREN-P
) ICS

(

)
ICS

1,

1)

2,

, 2)
, 5)

3,

4,

5

, 3)

, 4)

SUMMARY

,
,
.
.
.
,
.
[mec2][mec2][mec2][mec2]

Particle-in-Cell
(
.
.

),

(

),

(

)

1,

1)

2,

2,

, 2)

3

, 2)

SUMMARY

1.0

z [cm]

0.8

0.6

0.4

0.2

RTI

0
0 0.1 0.2 0.3 0 0.1 0.2 0.3 0 0.1 0.2 0.3

r [cm]

FIG. Dimpler [cm]

Alr [cm]

500J
He
(

torr)

0.1, 5, 50

11) QST

2

2)

SUMMARY

FIG.

TNSA

1,2

1,2

3

3

1)

4

, 2)

3)

,

2

1,2

,

, 4)

SUMMARY

800 m
Time

XFEL
-

-

Shock-drive laser
CH

10 ns

Al

400 GPa - 1500 GPa 0.4 TPa 1.5 TPa

Space
FIG.

VISAR

1

2

1

1

4

5

4

2,4

1)

2)
4)

1

3
2

2,4

3)

5)

SUMMARY
DAC
DAC
H2S

DAC
200 MPa

GXII
351 nm

2.5 ns
600 m
VISAR

SOP

70-230 GPa

H2S-

FIG. (a),(b) Raw VISAR/SOP streaked images from shot
44722, respectively. Overplotted are shock velocity (red) and
SOP count (blue) temporal profiles . (c) Particle velocity vs.
Pressure Hugoniot relationship.

1

1

1)

2

2

2)

3

2,3

3)

SUMMARY

MgSiO3VISAR

SOP
700GPa10000K
MgSiO3FIG.

()VISAR

(

)SOP

1,2

1

1

1

1

3
1

1)

1

1

1

3

1

1

3

1

4,1

, 2)

3
1,

, 3)

SUMMARY
-100
-80
-60
-40
-20
0
20
40
60
80
100

PINOCO
LFEX
X

1

3

3
1,3

, 4)

G45400 Transmittance
1st + 2nd pulses
Emission
during
1st pulse

1
1st + 2nd
+ 3rd pulses

0.8

0.6

0.4

0.2

Space [um]
FIG.

0.3ns

X
3

Behavior and optical properties of materials of planetological interest(water, carbon) at Megabar pressures

D.Batani1, K. Shigemori2, N. Nissim3, L. Perellmutter3, G. Schaumann4, K. Batani5, N. Ozaki6
1) Celia, University of Bordeaux, France, 2) ILE, Osaka University, Japan, 3) Soreq Nuclear Research Centre, Israel, 4) University of Darmstadt,
Germany, 5) IPPLM, Warsaw, Poland, 6) University of Osaka, JapanSUMMARY

We studied the behavior and the phase transitions ofmaterials of astrophysical and fundamental interest(water, carbon) in the Mbar pressure range. We
investigated the EOS of such materials but also their
optical properties (reflectivity, refraction index) using
standard SOP and VISAR diagnostics. In the experiment
we used water cells containing water at normal
atmospheric pressure (as in the figure) to compare resultswith those obtained in the previous experiment withperforated diamond anvil cells. Typically the cells had 10m plastic ablator followed by 0. m Al, 100 m quartz,
the water layer (about 500-600 m and again 100 m
quartz)As for diamond, we used multilayer targets made of 10
m plastics (ablator) followed by a metal layer (either 10m Au or 15 m Cu) and a diamond monocrystal withorientation 100 and density 3.51 g/cm3, of thickness
between 150 and 350 m. This was followed by a metal
step of same material and thickness. The laser energy ontarget was ranging in the interval 200 to 800 J.
Experimental results are still being analyzed.

FIG. up) photo on diamond target (with metal step on theback); bottom) Photo of water cell and corresponding streak
camera VISAR image showing the shock breakout at
metal/quartz interface and at quartz/water interface (shot44621, 417 J on target)

(2)
1,5

2

2

2

1)

2)
3)

SUMMARY

3

, 4)

, 5)

4

5

,

Zeeman splitting in the EUV spectrum emitted from a magnetized silicon plasma
Z. Zhong1, Y. Abe2,4, K. F. F. Law3, A. Yogo4, A. Morace4, T. Sano4, M. Murakami4, S. Fujioka4
1) Institute of Physics, Chinese Academy of Science, China, 2) Graduate School of Engineering, Osaka
University, Japan, 3) The University of Tokyo, Japan, 4) Institute of Laser Engineering, Osaka University, JapanSUMMARY

Combining a seed field of more than 100 T,
microtubes, and a short-pulse power laser is
expected to generate a magnetic field of up to
100 kT. A hollow capsule is used as a protonsource to generate a spatially uniform protonbeam, which improves the accuracy of magnetic
field measurements. The two on-axis micro-coiltargets were irradiated with LFEX laser (300J/1.5 ps x 2 beams) to generate a seedmagnetic field of more than 200 T at the
microtubule position. The realization of an ultrahigh magnetic field comparable to that on thesurface of a white dwarf star has led to the studyof extreme atomic states (nonlinear Zeeman
effect, Landau quantization) in the laboratory.
FIG. 1 Proton radiography image of laser-driven coiltarget to produce extremely strong magnetic field for
Zeeman splitting experiment.

Study of Magnetic Reconnection using Laser-driven Capacitor Coils
Shu Zhang1, Lan Gao2, Abraham Chien1, Hantao Ji1,2, Ryunosuke Takizawa3, Shinsuke Fujioka3, Youichi Sakawa3, Taichi
Morita4
1) Princeton University, USA, 2) Princeton Plasma Physics Laboratory, USA
3) Institute of Laser Engineering, Osaka University, Japan, 4) Kyushu University, Japan

Magnetic reconnection is ubiquitous in space andastrophysical plasmas, rapidly converting magnetic
field energy into plasma particles. Under thiscollaborative program, we have conducted anexperiment with GEKKO XII and LFEX lasers using
laser-driven capacitor coils to create reconnection
environment with antiparallel magnetic field in low-beta
plasmas and diagnosed the x-ray and optical emissions,Thomson scattering, and particle acceleration during thereconnection. The streaked and pinhole x-ray images
captured the x-ray emission in the reconnection region,
indicating plasma heating, which will be compared with
rad-MHD simulations to infer the field energy
conversion. The x-ray emission is also correlated withthe hot electrons captured by the electron spectrometers.
Detailed data analyses and their comparisons with RadMHD and PIC simulations will be conducted to further
understand the mechanism of the plasma heating andparticle acceleration in reconnection.

(a) Emission from coils(b)Emission from coilTime

SUMMARY

Emission fromreconnection regionTwo-coil reconnection

One-coil non-reconnection

FIG. Spatiotemporally resolved x-ray emission from (a) twocoil target (reconnection) and (b) one-coil target (nonreconnection). The emission circled by dashes is from thereconnection region between the coils.

Study on generation of a large electric current generation by using twowavelengths and polarizations mixed ultra high intensity laser
Y. Arikawa, S. Fujioka, A. Morace, K. Tsubakimoto, T. Suda, S. Asano, H. Shiraga
Institute of Laser Engineering, Osaka University
SUMMARY

We experimentally demonstrated to generate
electrons more efficient by using fundamental andsecond harmonics mixed LFEX beam. Four beams of
LFEX with an energy of 300 J of fundamental wasconverted to fundamental 150 J and second harmonics
150J mixed beam by LBO frequency conversion crystal
equipped to LFEX laser beamline. Homogenous beam
pattern in second harmonics is observed which ensures
the fundamental/second harmonics beams are welloverlapped at the focal spot. Electron and proton energy
spectrums are compared for fundamental only and themixed beam. Taken into account of that intensity of thelaser beam was different at a target, the number of theelectron is slightly increased for the mixed beam.

FIG. 1 Experimentallyobtained second harmonics
energy (vertical axis) for
injected
fundamental
energy (horizontal axis) .
Second harmonics beam
pattern is also seen as inset
figure.
FIG. 2 Electron energy
spectrum compared for
fundamental (two red lines)
and second harmonics andfundamental mixed (threegreen lines). Total laser
energies are similar for fiveshots but the peak intensity
for the mixed beam shot is
2.5 times smaller thanfundamental beam.

**T. Wei **SUMMARY

2021

LFEX
C1~6+
3.2 MeV/u
6.4 MeV
1mm

FIG.

LFEX
LFEX

*

*

1, N. P. Dover2,

3,4,

1)

1,

1,

1,

3,5,

3,4, J. Koga1,, 2) Imperial College London, 3)
, 5)

4)

3

,

SUMMARY[M. Nishiuchi et al.,Phys. Rev. Research 2, 033081 (2020)]
X[K. Sugimoto et al., High Energy Density Phys. 36,
100816 (2020)]
J-KAREN-P[Y. Takagi et al., Phys.
Rev. Research 3, 043140 (2021)]

FIG. 1(a)
PIC
Phys. Rev. Research 3, 043140 (2021)]

Emax
(b)
2
[Y. Takagi et al.,

1

1)

2

2

2)

SUMMARY

(EUV)

FIG.
10

500
5 mm

1,2

1)

2

2

2)

(a)

SUMMARY
BDT
BDS10

100

600

1000
TDR

15
FIGs. a, b)

(b)

(c)

BDS1000

FIG.
c

BDS100

: (a)
(b)
BDT

Q

DPSS

589nm

SUMMARY

808nm

Nd:YAG
1064nm 1319nm
589nm
LD

LD
KTP

Q
Nd:YAG

KTP

1mm
Q
Q

Q
V:YAG

Cr:YAG
Q

FIG1.

589nm

,

,

,
SUMMARY

1(2.224MeV)+1eV

0.96keV+/-10%+1eV
0.65keV+/-5%
13700

FIG1.

(2.224MeV)+1eV**

T. Wei **SUMMARY

2021

1

0.5 mm

20
2022
FIG.

*

*

SUMMARY

589nm
NMR

LFEX

FIG1.

Realization of stable, quasi-static and high density material compression with tailored laser pulse and solid ball target
1,2

1

1

1

1

3
1

1)

1

1

1

3

1

1

, 2)

1

3
4,1

1

3
1,

, 3)

3

3
1,3

, 4)

SUMMARY
3

1stst + 2nd pulses
Emiss
Emissionssssionduringdur
urringungg
1stt p
pulse
pu
ulse

3

X
X

FIG.

1st + 2nd
+ 3rd pulsesseLaboratory Measurement of Solar Opacity with High Intensity Laser
J. Dun1, F. Delahaye2, T. Maekawa1, Y. Wang1, T. Pikuz1, R. Takizawa1, S. Guo1, H. Morita1, B. Zhu1, M. Koenig3, H. Lahmar3, S. Lepape3,
B. Albertazzi3, P. Renaudin4, C. Blancard4, L. Jacquet4, S. Fujioka1
1) ILE Osaka Univ. 2) Obs. de Paris, 3) LULI, 4) CEA

SUMMARY
Uncertainties in the opacity of the solar interior
plasma may be a cause for the discrepancy
between standard solar model predictions andhelioseismology observations. The opacity is anecessary physical quantity that affects thetransport of photons in the solar interior anddetermines the structure of the interior. Sandia
National Laboratory team has proposed the
hypothesis that the open-L-shell state of ions inthe solar constituent plasma reduces theaccuracy of the plasma opacity calculations.
We are testing this hypothesis with the
GEKKO-LFEX facility. In FY2021, we havedeveloped an experimental platform. We use alaser-irradiated dog-bone cavity to generateintense thermal radiation for producing a localthermal-equilibrium plasma with spatially
uniform temperature and density profiles. We
have achieved 100 eV of the radiation
temperature and obtained the transmittancespectrum for calcium in the X-ray and XUVranges.

1st + 2nd pulses

1st + 2nd
+ 3rd pulses

FIG. (a) Comparison between measured blackbody radiation emitted
form a laser-cavity and the fitting curve with maximum Tr = 95.3eV.
(b) Calculated transmission spectrum by subtracted self-emitted
radiation of the heated sample (SN45183) from the absorption
spectrum (SN45196) and also divided by backlight spectrum(SN45180).

Study of characteristic K-alpha x-ray production using high power LFEX laser
H. Sawada1, R. Takizawa2, T. Maekawa2, J. Dun2, D. Morita2, N. Iwata2, Y. Sentoku2 and S. Fujioka2
1) University of Nevada Reno, USA, 2) Institute of Laser Engineering, Osaka University, JapanSUMMARY

This experiment has investigated characteristics oflaser-produced hard x-rays by the high power LFEX
laser. Narrow line and broadband hard x-rays producedby high intensity short pulse lasers have been studied to
explore the potential for applications in fundamental
science, medical and industrial fields. Up to date,detailed characteristics such as x-ray spectrum, x-ray
energy conversion efficiency and angular dependenceof the x-ray intensity have not been well understood. In
this experiment, we used a suite of diagnostics tomeasure angularly resolved bremsstrahlung, K x-ray
yields, monochromatic x-ray images, escaped electronsand energetic protons on every shot for various laser
intensities. These comprehensive measurements
together with 3-D hybrid particle-in-cell simulations
that are being underway will provide information on
laser-accelerated fast electrons as well as the broadband
hard x-rays specific to the high power LFEX laser.

HEXS2

K
imagerProtonfilm packs

Cu K

HOPG

HOPG

ESM
LFEX laser

Cu foil

HEXS1

HEXS3
Cu K image
FIG. 1 A schematic of the experiment and diagnostic layout.
X-ray and particle emissions were measured with an electron
spectrometer (ESM), hard x-ray spectrometers (HEXS), a
HOPG crystal spectrometer, a K imager and proton film
packs. Sample x-ray spectrum and K image are also shown.

Ion stopping power in dense plasmas
A. Morace1, Y. Arikawa1, S. Asano1, M. Tosca2, D. Margarone2, D. Batani3, P. Nicolai3, L. Giuffrida2, D. Raffestin3
Institute of Laser Engineering, Osaka University
Eli Beamlines
CELIA, University of Bordeaux
SUMMARY

We experimentally investigated the alpha particle
stopping power in dense plasmas by using a Borondoped CH open-shell target.
The shell is 500 m in diameter with an aperture of 200
m in diameter. LFEX laser is focused on the innersurface of the hemi-shell through the aperture.
According to PIC simulations, the open-shell target is
supposed to contain the self-generated magnetic field,
which in turn will be compressed by the imploding
TNSA plasma and confine the MeV plasma of
Hydrogen and Boron for longer time, thus enhancing
fusion reactions. The alpha particles will then cross theshell (15 m thick) and be detected by an array of CR39 detectors. Knowing the original energy of the alphaparticles it is possible to estimate the alpha particle
stopping power in dense plasmas.

FIG. 1 PIC simulation
showing the compressedmagnetic field profile
inside the open shell. Thismagnetic field will confine
the Hydrogen and Boron
ions enhancing fusion
reactions
FIG. 2 Example ofThomson parabola dataobtainedduringtheexperiment for open-shell
type
target.
CR-39
diagnostics
for
alpha
particle detection are still
under analysis at ELIBeamlines.

1,

1)

2,

2)

3,

1,

1,

, 3)

SUMMARY

2,

2,

4

, 4)
(a) Temporal evolution of Te and(b) X-ray self-emission streak images (15 m spatial and 100
ps temporal resolutions)

1st + 2nd pulses

X

1st + 2nd
+ 3rd pulses

Emission
during
1st pulseXx [ m](c) Ti-K flash backlight images (15 m spatial resolution)[g/cm3]Te [eV]

4.0ns

5.0ns

5.85nsX

Maximumcompressionx [ m]

r [ m]

XII
3(
2021NIFS12KUGK057 )FIG.1 2PINOCOGXII 3
(a)

(

), 2

X
(c). (b)( ), 3

X
(b)
( )

Ti-K

1,

1)

1,

2)

1,

2,

3

, 3)

SUMMARY

FIG. 1
(a)
(c)

(b)
X

LFEX

Dependence of Richtmyer-Meshkov Instability growth on gas compressibility
T. Sano1, C. Matsuoka2, and F. Cobos-Campos3
1) Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan, 2) Graduate School of Engineering,Osaka City University, Sugimoto, Sumiyoshi, Osaka 558-8585, Japan, 3) ETSI Industriales, Instituto de Investigaciones
Energéticas and CYTEMA, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.
SUMMARY

We have studied the dependence of the growthvelocity of Richtmyer-Meshkov Instability (RMI) on
the gas compressibility. A change in the behavior of thegrowth rate ( ) as a function of the ratio of the specificheats ( ) has been observed for some value of theincident shock strength ( ). Upper some critical valueof , the growth rate is severely reduced when1.
A freeze-out regime ( = 0) is achieved in the limit
1 and. This behavior has been seen in bothcases when a shock is reflected and when a rarefaction
is reflected. This would bring the possibility to find andcharacterize new freeze-out, or at least low-growth,
regimes for very intense shocks as those used in Inertial
Confinement Fusion (ICF) configurations. Therefore,
an interesting possibility could be open: can a low be
used to mitigate RMI if the shock is strong enough?

FIG. Dependence of the linear asymptotic growth velocity ( )as a function of the isentropic exponent of the gas (we assume
same as both sides== ) for different incident shock
Mach numbers ( ). Both cases, when a shock and ararefaction is reflected back, are shown. Since we consider
same , they correspond to light-heavy and heavy-light
configurations, respectively. The initial density ratio acrossthe contact surface ( =/ ) is 10 when a shock isreflected and 0.1 when contrary.

-

-

1

1)

1

2

2

, 2)

2,3

, 3)

SUMMARY
TW

50 m
2

CMOS

XY
50 m

50 m

5

20
FIG. ()( ))2021B2-022MORI

Theoretical study on particle acceleration in high energy density plasmas
created by kJ class ultraintense lasers
N. Iwata1,2, A. J. Kemp3, S. C. Wilks3, and Y. Sentoku1
1) Institute of Laser Engineering, Osaka Univ., 2) Institute for Advanced Co-Creation Studies, Osaka Univ.,
3) Lawrence Livermore National Laboratory, USA
SUMMARY

Kilojoule-class relativistic lasers, having overpicosecond pulse durations and tens of m spot sizes,
realize efficient particle acceleration and plasma heating.
To create high energy density state for theseapplications, confining laser-accelerated fast electrons
in the spot area for a long time is important. In thisstudy, we theoretically found a confinement mechanismof fast electrons in a large laser spot that has the radius
w much larger than the target foil thickness L0. The fastelectrons show a random walk scattered by a selfgenerated magnetic filaments in the spot. The escaping
velocity of the electrons from the spot is then reduced,
and the electrons accumulate in the spot area as Fig. 1.
We reported the result in N. Iwata et al., Phys. Rev.
Research 3, 023193. We will investigate the electron
confinement effect on the ion acceleration using the
ARC laser at NIF as a Discovery Science campaign in
2023-2024.

FIG. 1 Theoretical prediction of the accumulation density offast electrons nh due to the random walk inside the laser spot
area (radius w) in a solid foil target (thickness L0). nc is thecritical density for the incident laser. The shaded areas are theregimes where the model is not applicable. Points are twodimensional PIC simulation results. [N. Iwata et al., Phys. Rev.
Research 3, 023193]

SUMMARY

2021

(a)

2020

(b)

Figure 1:
(a)

(b)

1

1

1

1)

1

2

2

2)

SUMMARY
ZnO
ZnO
THz
THz

ZnO

ZnO

FIG. (a) ZnO
8 mm

6G

THz

ZnO

22
Society5.0

THz

8 mm
(b)

ZnO

1,

1,

1)

SUMMARY

2

, 2)

(a)

(b)

(c)

(d)

(a)

LiCoO2
THz-TDS
LiyCoO2

Li1.1CoO2(b)
LiyCoO2 (y = 0.6, 0.8, 1.0, 1.1) (c)
THz

(a)
(d)

1

2

1,

1

1

1

1)

2
1

3

2)

3)
SUMMARY

(THz)

(

)
1) THzPt(3nm)/Fe(2nm)/MgO
MgO
THz
1/2
AFM

2)

Pt

MgO
(0.5mm)

THz
m

100nm

Diabolo

2

Pt
200nm

Diabolo.
MgO
Pt(3nm)/Fe(2nm)

MgO

1

1)

1

2

2)

SUMMARY

PCBM
Au/Ti

Au/Ti

30 m

highly-resistive Si substrate

FIG.
Au/Ti
30 m

1

2

3

3
7

1)

2)

5)

6)

4
2

5

5

6

1

3)
7)

4)

SUMMARY

The transmittance spectrum of 1 wt. % COD pellet
measured by FTIR is shown in Fig. 1. A broad
absorption band centered at about 8.5 THz is observed.
In the case of COM, terahertz time-domain
spectroscopy (THz-TDS) investigation of pelletizedcommercial COM powder reveals a signature peak at
about 1.1 THz (not shown here). These findings showthat COD and COM can be distinguished in the THz
and far-infrared regions. This finding is useful in thephase identification of kidney stones which is valuable
in understanding the stone formation mechanism.

Fig. 1. Transmittance spectrum of 1 wt. % COD pellet.

1 , Mona Jarrahi2, Semih Cakmakyapan2,

1)
6)

2)

7)

1,

8,

Magnitude

SUMMARY

3)

7,

3,

5

1,

4,

4)
8)

f

5,

5)

RF Spectrum
analyzerLow noiseamplifier

Chaos
laser

THz

Prototype
terahertz receiver
Plasmon Antenna

THz

1GHz

RF

Terahertz
sourceUCLA system

Rf

6,

THz
1

1)

2

2)

SUMMARY
PC
0.05 pC

100 fs
10 kV~30
kV

2 mm
83 mm

1 pC

50 pC

5

SUMMARY

1, V. K. P. Mag-Usara2,

1

1)

2

2)

SUMMARY(a)(c)

Ge-Sb-Te
DVD-RW

PCRAM(b)
FIG.1(a)(d)

FIG.1(b)(FIG.
(c), (d))
FIG.1

(a)
(b)

(c) , (d)

1,

1)

1,

2

, 2)

SUMMARY(MetalFrameworks

Organic

MOF)
3 m MOF

MOF
MOF

FIG.
TCNQ
2.33

1

1)

1

2

2)

3

3)

(a)

SUMMARY(b)
10

Table (a)(b)
617kHz,

10

(
)

LD

Yb:YAG
1

1)

1

2

3

2)

3)

SUMMARY(LD)

5%

2.71 W

3.87 W
70%

-

LD
CW
FIG.

(Toc)

(3.87W)

5
70

1

1)

SUMMARY

2

2)

(a)

(b)

FIG. (a)

THz
(b)

X

1

1)

YAG

YAG

260

m

LFEX
1

1)

2

2)

SUMMARY

0.6

1.0exp 2.1 L B c × 10
1.2exp[2.1 L(B c) × 10 ] + 0.5,
1.6 exp 2.1 L B c × 10 + 1.6+

FIG. 1/Filling Factor

B-integral

1

1)

2

2

2)

3

3)

SUMMARY

2021

193nm ArF

FIG. 8mJ/cm2

40,0001

SUMMARY

Pr
Pr
Pr3+

FIG. XRD patterns of Pr3+doped samples prepared using
Pr(III) compounds (a) and (b).

Investigating the scintillation properties of rare-earth-doped APLF glasses with various doping
concentrations and excitation sources
M. Cadatal-Raduban1,2, M. J. F. Empizo2, K. Shinohara2, N. Sarukura2 and K. Yamanoi2
1) Massey University, New Zealand, 2) Institute of Laser Engineering, Osaka University, JapanSUMMARY

The optical properties of 20Al(PO3)380LiF(APLF80) glass doped with trivalent neodymium (Nd3+)
ions of varying concentrations from 0.5 to 2.0 mol%were evaluated by photoluminescence spectroscopies.
The electric-dipole allowed 4f25d 4f3 (4I9/2) transition
resulted to a broad VUV emission that peaked at ~187
nm. The decay time of this emission ranged from ~6.1
ns to ~5.0 ns when the doping concentration changed
from 0.5 mol% to 2.0 mol%. At room temperature, theabsorption edge located around 192 nm overlaps withthis VUV emission indicating that self-absorption could
limit the emission intensity. This overlap can be
minimized by working at low temperatures. Our resultspresent exciting prospects for improved downscattered-neutron detection in fast-ignition laser fusionas the scintillation decay time from Nd3+-doped APLF
glass is significantly faster than conventional glass
scintillators and this decay time can be made even fasterby adjusting the doping concentration.

FIG. Decay times of Nd3+-doped APLF glass at room
temperature under 157 nm F2 laser excitation with different
doping concentrations. The inset shows the photograph of the
1.0 mol% Nd3+-doped APLF glass.

1,

1)

1,

2

, 2)

SUMMARY

Spark Plasma Sintering: SPS)

SPS
CaF2

SPS
850
FIG. SPS

CaF2

SUMMARY

Ultra-short length gain fibers are expected to be
applied to range sensors and optical frequency combs
because of their ability to fabricate resonators with highrepetition rates around GHz. A photo-darkening (PD)phenomenon in a Yb doped silica fiber, however, makes
us difficult to use ultra-short Yb fiber due to requiring
too high concentration of Yb ions. We previously
reported that PD phenomenon can be suppressed by codoping group 2 elements to the Yb fiber. The PD effectof Yb-Mg co-doped silica fiber (YbMgSGF) is thelowest. In addition, laser oscillation has been alreadydemonstrated in YbMgSGF. However, the gain
properties of YbMgSGF are not well known, it isdifficult to establish a benchmark for cavity fabrication.
In this study, we will show the gain bandwidth in highconcentration YbMgSGF (Yb:54,600 ppm) to confirm
how much the pulse width can be shortened when
fabricated as a short pulse resonator. Last year, weconstructed a wideband probe laser system (FIG.1).

FIG.1 Output power for spectra of the tunable lasers: Red;
LD-1050-0050, Blue; LD-1060-0100, Green; LD- 1120-0100

1)

, 2)

SUMMARY

FIG.

Excitonic luminescence properties from new layered mixed-anion compounds with natural superlattice
Hiraku Ogino1, Yuki Iwasa1, Kohei Yamanoi2, Toshihiko Shimizu2, Sarukura Nobuhiko2
1) National Institute of Advanced Industrial Science and Technology (AIST), 2) ILE, Osaka University

x=1.00Intensity / arb.uni

SUMMARY
Compounds which exhibit excitonic emission areimportant for optical applications such as new type ofphophor materials and very fast scintillators. In somelayered compounds, excitonic luminescence is observed
because their layered structure works as a quantum well.
Previously we have investigated optical properties ofother compounds, Sr3Sc2Cu2S2O5 and Sr2ScCuSO3[1].
These compounds composed by semiconducting CuSlayer and perovskite-related SrScO layers. In both
samples sharp emission lines are observed near the bandedge. The merit of these group of compounds are theirchemical and structural flexibilities. In this year, we
explored this system, and found new material
Sr2ZnCu2Se2O2. Solid solutions of Sr2ZnCu2S2O2 Sr2ZnCu2Se2O2 were also synthesized.
[1] H. Ogino et al., Appl. Phys. Lett. 101 (2012) 191901

x=0.75x=0.50x=0.25
x=0
20

40
60
2 / deg(Cu-K )Fig. XRD pattern of Sr2ZnCu2(S1-xSex)2O280

EO
SUMMARYElectroOptical,

EO)
EO
EO

50%
EO

1040nm
1040nm1mmx1mmx0.6mm
EO

FIG1. EO
10V

1

1)

2

2)

SUMMARY

CsLiB6O10

CLBO

266nm
20W

10000
[Opt.

Exp. Vol.30, 11797 (2022)]

70mm
2Hz

10.8J
42

[
, B08-14a-II-

02(2022.1.14)]

FIG.

(a)

266nm

20W

10000

(b)
c)

Opt. Exp.

1

1)
SUMMARY

The Journal of Physical Chemistry
C

Applied
Physics Exprsss
FIG.
Copyright
2021
AmericanChemical Society (H. Takahashi, H. Y. Yoshikawa et al., J
Phys Chem C, 125, 8391-8397 (2021) )zoom)

5
*

1,

1)

1,

1,

, 2)

2,

, 3)

SUMMARY

3,

2, 4

4)

0.25
0.2

AI

10
800 nm

900 nm

0.15

RMSE

AI

0.1

0.05
0

(RNN)
RMSE (Root Mean Squared Error)
RNN

hard
sigmoid

softsign softplus

10
FIG

ReLU

2,

softplus

FIG. RMSE

linearReLU

Optab
1,

1)

2

, 2)

SUMMARY

Optab
Hirose et al. 2021
https://github.com/nombac/optab

FIG.

Optab
Optab

GitHub

1,

1)

2,

2,

, 2)

3

, 3)

( eV / atom )SUMMARY

0.1
0.08
0.06
0.04

SALMON (Scalable Ab-initio Light-Matter
simulator for Optics and Nanoscience )
SiO2

Si

0.02
0

0

5

SALMON

10Time (fs)

15

SiO2
15 fs

5 x 1013 W/cm2

20

X
1

1

1)

2

2)

SUMMARY10X(XFEL)

X

PICLS
FIG.1
X

Cu

K
K
800

30
FIG.2

PICLS
X

FLYCHK

FIG.1. XFELK
FIG.2. PICLSXCuXFLYCHKCu

20 m
200 fs

XFEL

1,2,3

1)

, 2)

, 3)

SUMMARY(Vortex Sheet Model, VSM
)

FIG.

1

1)

2

2

2)

SUMMARY

!

!

FIG.

Nd:CaF2

1,

1)

1,

2

2)

SUMMARY
Nd:CaF2
Nd3+
Nd3+
Nd3+

La3+
0.4 mol%

0.1 mol%
6000 ml

1.06

m

85%
FIG. Nd:CaF
d2: 600 ml

: 3000 ml: 6000 ml

Decay instabilities of whistler waves in solar wind plasmas
T. Sano1, Y. Sentoku1
1) Institute of Laser Engineering, Osaka University
SUMMARY

[1]

[2]
MeV

[3]
[1] T. Sano, et al., Phys. Rev. E 96, 043209 (2017)[2] S. Matsukiyo and T. Hada, Astrophys. J. 692, 1004
(2009)[3] T. Sano, et al. submitted to Phys. Rev. E

Time variation of the envelope of the electromagnetic fields, E (black solid)
and B (gray dashed), and the electronenergy (color) as a function of theposition x. The snapshots are taken at (a) t/t0 = 7, (b) 3, (c) 1, and (d) 1 in thefiducial run of right-hand circularly polarized laser (a0 = 30 and Bext/Bc = 30).
The color of each particle indicates the weight of the number of particles.

1,

2,

2,

3,

4,

4,

5,

6,

7,

3

1) Center for Materials Under Extreme Environments (CMUXE), School of Nuclear Engineering, Purdue University, USA,
2)

, 3)

, 4)

, 5)

, 6)

, 7)

SUMMARY

Star2D2

STAR2Da)0ns(), b) 5ns, c) 10ns.

Yiming Pan, Kentaro Tomita, Kiichiro Uchino, Atsushi
Sunahara, Katsunobu Nishihara, APEX 14 (2021) 066001.

1,2

1)

3

1,2

2)

2

3) IHI

44)

SUMMARY

12
CO2
CCS

532 nm
628 nm

6 m
FIG.1

FIG.1

6 m

1

1

1

1

1

2

1)

2

2)

SUMMARY(LDNS)(NRTA)LFEX
TOF(PHITS)

3

LDNS

NRTA
FIG.
TOF

2

2

1,

1)

1,

1,

2

, 2)

SUMMARY

CNT)

CNT

4.0minCNT
FIG(b4)4.0min(b2)3.0~(b3)3.5min
CNT

FIG. Cross-sectional SEM images of CNT forest (a1 - a4)
with various CVD growth time for 1 to 20 sec with constantcatalyst annealing period of 4.0min, and (b1  b4) with theconstant CVD time of 1sec with various catalyst annealing
period of 2.5 to 4.0 min.

1

1)

SUMMARY

10

X

100Hz

PLC

PLC(Programmable Logic Controller)

1

1)

2

2)

SUMMARY

FIG.

Time-Latitude Diagram. (a)

, (b)

1)

2)

SUMMARY

Hf
Ce
SPS
Hf

SrHfO3
Ce3+

5d-4f

FIG

FIG.

Ce

SrHfO3

137Cs

GaN
1

1)

1

1

2

2)

3

3)

SUMMARY
GaN

3.4 eV

GaN

Ni

4

Ga
GaN

FIG. 1 Ga
4

2
Si

Ge

Mg Zn

Sn
GaN

density of states

Ni
ON

CW-THz
1,

1)

,2

, 2)

SUMMARY

THz
Sub-THzTHz

THz-TDS

THz