Speaker
Yoneyoshi Kitagawa
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.2017.pdf
Fast ignition fusion by counter beam illumination for the CANDY project
-Hole boring on injected CD spherical pellet targets-
Y. Kitagawa1 , R. Hanayama1 , Y. Mori1 , K. Ishii1 , S. Okihara1 , O. Komeda2 , H. Suto2 ,
Y. Umetani2 , J. Okijima2 , T. Hioki3 , T. Motohiro3 , A. Sunahara4 , Y. Sentoku5 , Y. Arikawa5 ,
Y. Abe5 , E. Miura6 , H. Sakagami7 , S. Ozaki7 , A. Iwamoto7 , T, Johzaki8
1 The Graduate School for the Creation of New Photonics Industries, 2 Advanced Material
Engineering Div., TOYOTA Motor Corporation, 3 Nagoya University, GREMO, 4 CMUXE,
Perdue University, 5 Institute of laser Engineering, Osaka University, 6 National Institute of
Advanced Industrial Science and Technology, 7 National Institute for Fusion Science,
8 Faculty of Engineering, Hiroshima University
A kJ-class mini reactor CANDY, as in Fig. 1, is pro-
posed for an engineering feasibility study of the power
plant in the counter beam fast ignition scheme fusion. To
develop the CANDY, we are performing fast ignition ex-
periments using both single-shot petawatt lasers[1] and
Figure 1: CANDY image. DT cryo-
a high-repetition-rate laser-diode(LD)-pumped laser with
genic fuel pellets are injected at 10 Hz
counter beam configuration[2].
by the counter implosion beams fol-
Fuel pellet injection and repetitive laser illumina-
lowed by coaxial heating beams.
tion are key technologies for realising inertial fusion
energy[3]. Relating to the fast ignition fusion, hot electron transports through a dense core are
big issues. We have succeeded in 1 Hz injection of solid spherical deuterated polystyrene bead
pellets, whose diameter is 1mm, which two ultra-intense laser beams engaged from both sides.
A straight channel (hole boring) with about 10µ m diameter was formed inside the injected pel-
lets, as in Fig. 2. The laser provides 0.63 J/beam in 100 fs at 811 nm: 4.7 × 1018 W/cm2 . Only
the injected pellets have the holes, but no other shaped or earthed targets have. The experiments
show that the short pulse laser driven hot electrons bore the holes. Some possible mechanism
due to such as preplasmas will be presented.
References
[1] Y. Kitagawa et al., Phys. Rev. Lett. 114 195002(2015); Nu-
clear Fusion 57 076030(2017).
[2] Y. Mori et al., Phys. Rev. Lett. 117 055001(2016);Nuclear Fu-
sion 57 116031(2017).
Figure 2: Hole through in an injected and
[3] O. Komeda et al., Scientific Reports 3 2561(2013).
counter-laser beam engaged CD bead.
