電子加速技術の開発成果と展望

大阪大学産業科学研究所

細貝知直

最先端科学を拓く巨大な高エネルギー 加速器
⾃由電⼦レーザー(FEL: Free Electron Laser)
電⼦加速器

SPring-8

アンジュレータ

レーザー光

XFEL SACLA

放射光リング(シンクロトロン)

磁⽯

軌道電⼦

放射光

最先端科学を拓く巨大な高エネルギー 加速器

SPring-8

XFEL SACLA手のひらサイズの超高エネルギー 加速を目指して
SPring-8ৈఢణपेॊਗ਼৕ਸசधঞ‫ش‬२‫ش‬पेॊਗ਼৕ਸசXFEL SACLAঞ‫ش‬२‫ش‬पेॊਗ਼৕ਸசम৫৅஺మदँॊऋ
阪大産研・理研で開発中のਸசஓभপ்ऩॲक़থ१ॖ४থॢऋ૭ચ

レーザーGeV級加速装置（~5cm）

৸শPद*H9भਸசৈఢణपेॊਗ਼৕ਸசஓ
‫ع ق‬0H9P‫ك‬৸শPद*H9भਸசঞ‫ش‬२‫ش‬पेॊਗ਼৕ਸசஓ
‫*عق‬H9P‫ك‬レーザー航跡場加速(Laser Wakefield Acceleration; LWFA )超高強度レーザーでプラズマ中にほぼ光速の波を作り電子を波乗り加速

l ボートで立てられた海の波とイルカ   

V<<Cレーザー航跡場加速(Laser Wakefield Acceleration; LWFA )超高強度レーザーでプラズマ中にほぼ光速の波を作り電子を波乗り加速

l レーザーで立てられたプラズマの波
電子

l ボートで立てられた海の波とイルカ   



VC

V<<C

プラズマ中の電子が・電子はレーザーで作られたプラズマの波からエネルギーをもらう

波乗り加速

レーザー航跡場加速の原理

真空中のパルスガスジェットに超高強度レーザーを照射すると電子ビームが発生

Gas-JetLaser

Wake-fields

e-Beame-injection
Acceleration~ 1mm
Nozzleレーザー航跡場加速の原理

真空中のパルスガスジェットに超高強度レーザーを照射すると電子ビームが発生

Gas-JetLaser

Wake-fields

e-Beame-injection
Acceleration~ 1mm
Nozzleレーザー航跡場加速の原理

真空中のパルスガスジェットに超高強度レーザーを照射すると電子ビームが発生

Gas-JetLaser

Wake-fields

e-Beame-injection
Acceleration~ 1mm
Nozzleレーザー航跡場加速の原理

真空中のパルスガスジェットに超高強度レーザーを照射すると電子ビームが発生
Electron Injection
Electron density

Gas-JetLaser

Wake-fields
Plasma wave; buckets

Laser Pulse

e-BeamElectric fielde-injection
Acceleration~ 1mm
NozzleA.Zhidkov, et al

・超高電界 > 100 GV /m （従来加速器の1000倍以上の加速電場）
・ 極短パルス < 〜数フェムト秒

1000兆ワットの光を作り出す
チャープパルス増幅法
How to produce
Terawatt laser pulses ?
CPA (Chirped Pulse Amplification)
~1nJ
~20fs

Oscillator~20TW~500TW~1J,~500ps

~1J
~50fs
~10J, ~20fs~1nJ,~500ps

Stretcher

AmplifierDr. Gerard Mourou
2018 ノーベル物理学賞

Compressor

Compressor

Stretcher
Grating~500ps

Grating

Gratingt~20fs~500ps

Grating~20fs

1000兆ワットの光を作り出す
チャープパルス増幅法
How toレーザー集光強度の変遷
produce
Terawatt laser pulses ?
CPA (Chirped Pulse Amplification)
~1nJ
~20fs

Oscillator~20TW~500TW~1J,~500ps

~1J
~50fs
~10J, ~20fs~1nJ,~500ps

Stretcher

AmplifierDr. Gerard Mourou
2018 ノーベル物理学賞

Compressor

Compressor

Stretcher
Grating~500ps

Grating

Gratingt~20fs~500ps

Grating~20fs

現在のLWFAチャンピオンレコードは加速距離 30cmで 8GeVのエネルギー利得

PHYSICAL REVIEW LETTERS 122, 084801 (2019)
Editors' Suggestion

Featured in Physics

Petawatt Laser Guiding and Electron Beam Acceleration to 8 GeV
in a Laser-Heated Capillary Discharge Waveguide

PHYSICAL REVIEW LE

A. J. Gonsalves,1,* K. Nakamura,1 J. Daniels,1 C. Benedetti,1 C. Pieronek,1,2 T. C. H. de Raadt,1 S. Steinke,1 J. H. Bin,1
S. S. Bulanov,1 J. van Tilborg,1 C. G. R. Geddes,1 C. B. Schroeder,1,2 Cs. Tóth,1 E. Esarey,1 K. Swanson,1,2
L. Fan-Chiang,1,2 G. Bagdasarov,3,4 N. Bobrova,3,5 V. Gasilov,3,4 G. Korn,6 P. Sasorov,3,6 and W. P. Leemans1,2,†
1Experiment

(a)

-1

(Received 7 December 2018; revised manuscript received 30 January 2019; published 25 February 2019)02
Guiding of relativistically intense laser pulses with peak power of 0.85 PW over 15 diffraction
lengths
1

4

6

8

10

0
1

DOI: 10.1103/PhysRevLett.122.084801
PHYSICAL REVIEW LETTERS 122, 084801 (2019)

0

2

6.5

7.0

7.5

200
4

6

8

10

(c)

axis [14], as is the case with graded-index optical fibers.
Laser plasma accelerators (LPAs) [1,2] have large
For a parabolic channel with density
depth) Δn
acceleration gradients of tens to hundreds of GV/m, which-1 rise (channel
2
at a radius rch given by nðrÞ ¼ 0
is several orders of magnitude larger than conventionaln0 þ ðΔn=r
Þr
2 ch 2, a 4low
radio frequency technology. This could allow for compact
intensity transversely Gaussian laser pulse can propagate
1 input laser mode size
accelerators in a variety of applications, including freewith constant spot size when theelectron lasers [3–5], Thomson sources [6,7], and electronequals the matched spot size of the0channel (r0 ¼ rm ), where
positron colliders with TeV energy [8,9]. For futurerm ¼ ½πre ðΔn=r2ch Þ&−1=4 and re is the classical electron
efficient colliders using PW-class laser systems, singleradius. The capillary discharge-1waveguide [15] has been
stage energy gains of about 10 GeV are required [9].
shown to be an effective method both
plasma0 of producing
24Electron beams with energy up to a few GeV have beenchannels and increasing energy gain in laser plasma accel1 length [13,16,17]. The
observed using nonpreformed plasmas and petawatt laser
erators through increased acceleration
systems [10–12]. Preformed plasma waveguides can bedischarge current ionizes and heats
0 the plasma via Ohmic
used to mitigate laser diffraction of focused laser pulses,
heating. Since the plasma cools at the capillary wall, awhich increases the acceleration length and the energy
temperature maximum and density-1 minimum is formed on
gain
for
a
given
laser
power.
Usingacapillarydischarge
thecapillary
axis
[18].
In
order
FIG. 2. Schematic layout of the BELLA LPA, including the heater laser system for enhancing the capillary discharge waveguide.
0to increase2 energy 4gain
waveguide to confine laser pulses over a distance of 9 cm,
toward 10 GeV [19], the laser power must be increased toelectronbeams
withentrance
energy toupatospot
4.2sizeGeV
the[20],petawatt
plasma density reduced to(redproduced
squares) as in Ref.
the matchedlevel,
spot size theis reduced
focusedonto thecapillaryof were17 IB heating.
−3
for a given density, consistent
with
Bythe
timingther0 ¼ using
84 μm.aHere
r0 peakis defined
aspowerthe radiusat which
lower
laser
of
300
TW
[13].
≈
2
×
10
cm
,
and
guidingachieved over twice the21heaterpulse
toarrivet
the intensity
drops
to
1=e
of
the
peak
value.
Probe
laser
¼
300
ns
after
the
peak
of
d
The energy gain of a single-stage LPA [1] scales
number of diffraction ranges the(≈ 15 ZR ) relative to previous
pulses with wavelength 800 nm and energy at nJ level weredischarge current (blue circles), which reduces the plasma
inversely
plasmanthe accelerating
experiments
However,
0 , since
focusedto a focalwith
spot sizer0 ≈ 73density,
temperature and therefore
increases[13].
the heating
rate, atthethis
μm
at
the
same
location
0 plasma density, and for
1=2
gradientscales
∝
n
,
and
the
lengthislimitedtothethecapillarydiameterrequiredto
avoid laser damage, thematchedspot
size
reductionisevenlarger.
For
exampleatand arrived
at thepeakasofEthe
heatercurrent
pulse.
Thez0capillarydischarge was operatedhydrogen¼ 3.4
× 1017 cm−3, the matchedspot size
was reduced
laser-depletion
length, withwhich
scalesusingas theLd ∝ nn0−3=2.
This
capillarydischarge
waveguide
producesa channel that is not-10current
pulse shownin Fig.
which had
amplitudeof energy
from 101
Forenoughtd ¼ 420tons sufficiently(green triangles),ascalingshows
that1(a),in orderto anincreasethegainμmtoto 69 μm.
deep
confinethe0 laser2pulse. 4

Angle (mrad)

6.0

400

(b)

was demonstrated by increasing the focusing strength of a capillary discharge waveguide using laser
inverse bremsstrahlung heating. This allowed for the production of electron beams with0quasimonoenergetic peaks up to 7.8 GeV, double the energy that was previously demonstrated. Charge was 5 pC at
7.8 GeV and up to 62 pC in 6 GeV peaks, and typical beam divergence was 0.2 mrad. -1

150
100
50
0

6

8

10

(d)

6

8

10

(e)

6

8

10

0
200
100
0
150
100
50
0
150
100
50
0

6.5

7.0

7.5

8.0

30
20
10
0
30
20
10
0
100
50

5.5

5.5

7.0

6.0

6.0

7.5

6.5

6.5

8.0

7.0

7.0

8.5

0
100
50
0
9
6
3
0

Simulation
GeV

(f)

6

8

10

400

200

200

100

0

5.0

5.5

6.0

6.5

0

pC/mrad/(GeV/c)

Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
2
University of California, Berkeley, California 94720, USA
3
Keldysh Institute of Applied Mathematics RAS, Moscow 125047, Russia 1
4
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow 115409, Russia
5
Faculty of Nuclear Science and Physical Engineering, CTU in Prague, Brehova 7, Prague 0
1, Czech Republic
6
Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic現在のLWFAチャンピオンレコードは加速距離 30cmで 8GeVのエネルギー利得

課題はビームの品質・再現性・安定性・制御性

etc.

PHYSICAL REVIEW LETTERS 122, 084801 (2019)
Editors' Suggestion

Featured in Physics

Petawatt Laser Guiding and Electron Beam Acceleration to 8 GeV
in a Laser-Heated Capillary Discharge Waveguide

PHYSICAL REVIEW LE

1Experiment

Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
2
University of California, Berkeley, California 94720, USA
3
Keldysh Institute of Applied Mathematics RAS, Moscow 125047, Russia 1
4
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow 115409, Russia
5
Faculty of Nuclear Science and Physical Engineering, CTU in Prague, Brehova 7, Prague 0
1, Czech Republic
6
Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic(a)

XFEL SACLA-1 February 2019)(Received 7 December 2018; revised manuscript received 30 January 2019; published 25~
0 8GeV
2
4
6

Guiding of relativistically intense laser pulses with peak power of 0.85 PW over 15 diffraction
lengths1
was demonstrated by increasing the focusing strength of a capillary discharge waveguide using laser
inverse bremsstrahlung heating. This allowed for the production of electron beams with0quasimonoenergetic peaks up to 7.8 GeV, double the energy that was previously demonstrated. Charge was 5 pC at
7.8 GeV and up to 62 pC in 6 GeV peaks, and typical beam divergence was 0.2 mrad. -1

8

10

DOI: 10.1103/PhysRevLett.122.084801
PHYSICAL REVIEW LETTERS 122, 084801 (2019)

0

2

4

axis [14], as is the case with graded-index optical fibers.
Laser plasma accelerators (LPAs) [1,2] have large
For a parabolic channel with density
depth) Δn
acceleration gradients of tens to hundreds of GV/m, which-1 rise (channel
2
at a radius rch given by nðrÞ ¼ 0
is several orders of magnitude larger than conventionaln0 þ ðΔn=r
Þr
2 ch 2, a 4low
radio frequency technology. This could allow for compact
intensity transversely Gaussian laser pulse can propagate
1 input laser mode size
accelerators in a variety of applications, including freewith constant spot size when theelectron lasers [3–5], Thomson sources [6,7], and electronequals the matched spot size of the0channel (r0 ¼ rm ), where
positron colliders with TeV energy [8,9]. For futurerm ¼ ½πre ðΔn=r2ch Þ&−1=4 and re is the classical electron
efficient colliders using PW-class laser systems, singleradius. The capillary discharge-1waveguide [15] has been
stage energy gains of about 10 GeV are required [9].
shown to be an effective method both
plasma0 of producing
24Electron beams with energy up to a few GeV have beenchannels and increasing energy gain in laser plasma accel1 length [13,16,17]. The
observed using nonpreformed plasmas and petawatt laser
erators through increased acceleration
systems [10–12]. Preformed plasma waveguides can bedischarge current ionizes and heats
0 the plasma via Ohmic
used to mitigate laser diffraction of focused laser pulses,
heating. Since the plasma cools at the capillary wall, awhich increases the acceleration length and the energy
temperature maximum and density-1 minimum is formed on
gain
for
a
given
laser
power.
Usingacapillarydischarge
thecapillary
axis
[18].
In
order
FIG. 2. Schematic layout of the BELLA LPA, including the heater laser system for enhancing the capillary discharge waveguide.
0to increase2 energy 4gain
waveguide to confine laser pulses over a distance of 9 cm,
toward 10 GeV [19], the laser power must be increased toelectronbeams
withentrance
energy toupatospot
4.2sizeGeV
the[20],petawatt
plasma density reduced to(redproduced
squares) as in Ref.
the matchedlevel,
spot size theis reduced
focusedonto thecapillaryof were17 IB heating.
−3
for a given density, consistent
with
Bythe
timingther0 ¼ using
84 μm.aHere
r0 peakis defined
aspowerthe radiusat which
lower
laser
of
300
TW
[13].
≈
2
×
10
cm
,
and
guidingachieved over twice the21heaterpulse
toarrivet
the intensity
drops
to
1=e
of
the
peak
value.
Probe
laser
¼
300
ns
after
the
peak
of
d
The energy gain of a single-stage LPA [1] scales
number of diffraction ranges the(≈ 15 ZR ) relative to previous
pulses with wavelength 800 nm and energy at nJ level weredischarge current (blue circles), which reduces the plasma
inversely
plasmanthe accelerating
experiments
However,
0 , since
focusedto a focalwith
spot sizer0 ≈ 73density,
temperature and therefore
increases[13].
the heating
rate, atthethis
μm
at
the
same
location
0 plasma density, and for
1=2
gradientscales
∝
n
,
and
the
lengthislimitedtothethecapillarydiameterrequiredto
avoid laser damage, thematchedspot
size
reductionisevenlarger.
For
exampleatand arrived
at thepeakasofEthe
heatercurrent
pulse.
Thez0capillarydischarge was operatedhydrogen¼ 3.4
× 1017 cm−3, the matchedspot size
was reduced
laser-depletion
length, withwhich
scalesusingas theLd ∝ nn0−3=2.
This
capillarydischarge
waveguide
producesa channel that is not-10current
pulse shownin Fig.
which had
amplitudeof energy
from 101
Forenoughtd ¼ 420tons sufficiently(green triangles),ascalingshows
that1(a),in orderto anincreasethegainμmtoto 69 μm.
deep
confinethe0 laser2pulse. 4

Angle (mrad)

6.0

6.5

7.0

7.5

200
6

8

10

(c)
6

8

10

(d)

6

8

10

(e)

~10cm

SPring-8
~8GeV

400

(b)

0
1

150
100
50
0

6

8

10

0
200
100
0
150
100
50
0
150
100
50
0

6.5

7.0

7.5

8.0

30
20
10
0
30
20
10
0
100
50

5.5

5.5

7.0

6.0

6.0

7.5

6.5

6.5

8.0

7.0

7.0

8.5

0
100
50
0
9
6
3
0

Simulation
GeV

(f)

6

8

10

400

200

200

100

0

5.0

5.5

6.0

6.5

0

pC/mrad/(GeV/c)

A. J. Gonsalves,1,* K. Nakamura,1 J. Daniels,1 C. Benedetti,1 C. Pieronek,1,2 T. C. H. de Raadt,1 S. Steinke,1 J. H. Bin,1
S. S. Bulanov,1 J. van Tilborg,1 C. G. R. Geddes,1 C. B. Schroeder,1,2 Cs. Tóth,1 E. Esarey,1 K. Swanson,1,2
L. Fan-Chiang,1,2 G. Bagdasarov,3,4 N. Bobrova,3,5 V. Gasilov,3,4 G. Korn,6 P. Sasorov,3,6 and W. P. Leemans1,2,†

加速・発生機構の解明とともにビーム制御技術の開発も進んできた。
Y.Mizuta,et al, Phys.Rev.ST, 15, 121301 (2012)
N.Nakanii,et al, Phys.Rev.ST, 18, 021303(2015)sGa

Short Focus OAP
F#~ 3, I~1019W/cm2

PMO (Plasma micro-optics)
Gas-jet withexternal B-fields

T.Hosokai, et al., Appl. Phys. Lett. 96,121501 (2010)~10-6~-7

10

Main
Pulse

Compression
leakage

ASE~ fewns~fewps~tensfst

Electron Density [cm-3]~10-5~-6

T.Hosokai,et al.,Phys Rev.Lett. 97, 075004 (2006 )

Laser

1

Contrast

e-bunch

1.0mm
x1019

1

10-1

10-2
100

-50

0

50

Position R [µm]100j  1E
ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊਸசਙચभ਱঱
উছ६ঐణ
2*"#  .5‫ش‬লৡ‫؟‬৵‫ك‬଍஄भణ
レーザー航跡場の機能分離による性能向上ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊਸசਙચभ਱঱
१ঈ3:ঞ‫ش‬२‫ش‬
*H9  1E ‫ق‬਍৒‫ك‬
多段レーザー航跡場加速ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊਸசਙચभ਱঱

६ঐణৡ‫؟‬৵‫ك‬ൠःউছ६ঐణ

Smallঞ‫ش‬२‫ش‬লৡ‫؟‬৵‫ك‬ൠःউছ६ঐణ
小‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬৵‫ك‬

2*"#  1E  .5଍஄भణ

2*"# .5  1E
१ঈ3:ঞ‫ش‬२‫ش‬LinearWake
線形レーザー航跡場
଍஄भణ

Sub-PW Laser2*"# .5१ঈ3:ঞ‫ش‬२‫ش‬

଍஄भణ

ਗ਼৕৅ে
਑౪
१ঈ3:ঞ‫ش‬२‫ش‬‫౐૆ق‬౦৲‫ك‬

ਸச*H9

*H9Electron beam
*H9 ‫ق‬਍৒‫ك‬Multi-GeV(> 1 GeV)(Stable)‫ق‬਍৒‫ك‬‫ق‬਍৒‫ك‬

A:'<>()D-6P6 ‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬
Largeਘःউছ६ঐణ

ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬঩মM‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬
2*9B.5%
‫౐૆ق‬౦৲‫ك‬
'!$=/C7 ?4
@&

ਲਗ

;+

శ଍஄भణ
శ଍஄भణ

঩ম

e-bunch
;+

ਲਗ

;+

ਲਗ ঩ম
঩ম

A:'<>()D-6P6
A:'<>()D-6P6ਲਗ

Laserレーザー強度
Intensity

プラズマ密度উছ६ঐణ‫ش‬লৡ‫؟‬প‫ك‬ਘःউছ६ঐణ
大;+Plasmadevicesਗ਼৕৅ে ਑౪
਑౪
ਸச ਸச
ਗ਼৕৅ে
ਸச
ਗ਼৕৅ে
਑౪
830,1E

非線形レーザー航跡場
శ଍஄भణNon-Linear
Wake-IV
-IV
-IV
A:'<>()D-6P6ਯ3:ঞ‫ش‬२‫ش‬ਈ੺म‫ؚ‬ਲਗु਍‫ق‬7:‫ ك‬830,1E‫ق‬7:‫ك‬‫ق‬7:‫ك‬830,1E

৒ਙ॑੎ଳख‫ؚ‬੗
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2*9B.5%
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-IV 830,1E
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-IV
2*9B.5%
?4‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬ਯ3:ঞ‫ش‬२‫ش‬
'!$=/C7


@&
৒ਙ॑੎ଳख‫ؚ‬੗ਈ੺म‫ؚ‬ਲਗु਍‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬஺ਸச॑ॺছॖ
৒ਙ॑੎ଳख‫ؚ‬੗ਗ਼৕৅েٔਸச
-IV
-IV
-IV@&ਯ3:ঞ‫ش‬२‫ش‬
ਗ਼৕৅ে
਑౪
ਸச
追加速
位相回転
電子銃
஺ਸச॑ॺছॖ
Electronਈ੺म‫ؚ‬ਲਗु਍
QME.
Acceleration‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫౐૆ق‬౦৲‫ك‬
Sourceುਡ‫ٯ‬ᄌ༿पଡണর
ਗ਼৕৅েٔਸச !ਯ*H9‫ਂق‬਍৒‫ك‬৒ਙ॑੎ଳख‫ؚ‬੗
@&
ਗ਼৕৅ে
਑౪
ਸச
‫౐૆ق‬౦৲‫ك‬஺ਸச॑ॺছॖ
ਗ਼৕৅েٔਸச
@&!ਯ*H9‫ਂق‬਍৒‫ك‬ುਡ‫ٯ‬ᄌ༿पଡണর
ਗ਼৕৅ে
਑౪
ਸச

‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬!ਯ*H9‫ਂق‬਍৒‫ك‬ುਡ‫ٯ‬ᄌ༿पଡണর
ುਡ‫ٯ‬ᄌ༿पଡണর

ਗ਼৕৅েٔਸச
ਗ਼৕৅ে
਑౪

37

37

@&
ਸச37

ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊਸசਙચभ਱঱
উছ६ঐణ
2*"#  .5‫ق‬਍৒‫ك‬  1E

‫ش‬লৡ‫؟‬৵‫ك‬  1E
ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊ
2*"#  .5଍஄भణ
レーザー航跡場の機能分離による性能向上ൠःউছ६ঐణ
‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬৵‫ك‬ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊਸசਙચभ਱঱
१ঈ3:ঞ‫ش‬२‫ش‬
*H9଍஄भణ਑౪ਗ਼৕৅েਸச१ঈ3:ঞ‫ش‬२‫ش‬ 1E ‫ق‬਍৒‫ك‬ൠःউছ६ঐణ
多段レーザー航跡場加速
A:'<>()D-6P6‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬৵‫ك‬ঞ‫ش‬२‫ش‬ਈి৲पेॊಌऩॊਸசਙચभ਱঱
଍஄भణ

830,1Eਸச*H9-IV
-IV
Sub-PW ਯ3:ঞ‫ش‬२‫ش‬Laser
2*"# .5
Electronbeam
१ঈ3:ঞ‫ش‬२‫ش‬ਈ੺म‫ؚ‬ਲਗु਍*H9Multi-GeV‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬਍৒‫ك‬(> 1 GeV)
৒ਙ॑੎ଳख‫ؚ‬੗ਗ਼৕৅ে਑౪
ਸச*H9 A:'<>()D-6P6
१ঈ3:ঞ‫ش‬२‫ش‬(Stable)LinearWake
線形レーザー航跡場଍஄भణ‫౐૆ق‬౦৲‫ك‬-IVਲਗ‫౐૆ق‬౦৲‫ك‬‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬
Largeਘःউছ६ঐణ

ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬-IV
-IVਯ3:ঞ‫ش‬२‫ش‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬!ਯ*H9‫ਂق‬਍৒‫ك‬ುਡ‫ٯ‬ᄌ༿पଡണর
;+‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬
2*9B.5%
‫౐૆ق‬౦৲‫ك‬
'!$=/C7 ?4
@&

శ଍஄भణ
శ଍஄भణ

ਲਗ

ਲਗ

;+

঩ম

ਲਗ ঩ম
঩ম

;+

非線形レーザー航跡場
శ଍஄भణNon-Linear
Wake-

ਈ੺म‫ؚ‬ਲ‫ق‬7
2*9B
৒ਙ॑੎ଳ'!$
M
஺ਸச॑ॺ-IV37 ਯ3:ঞ‫ش‬२‫ق‬7:‫ك‬

@&
ਗ਼৕৅ে
਑౪
ਸச
-IV
-IV
-IV
A:'<>()D-6P6ਯ3:ঞ‫ش‬२‫ش‬‫౐૆ق‬౦৲‫ك‬శ଍஄भణਘःউছ६ঐణ
!ਯ*H9‫ਂق‬਍৒‫ك‬ುਡ‫ٯ‬ᄌ༿प
ਈ੺म‫ؚ‬ਲਗु਍‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬830,1E
ਲਗ঩মPlasmadevicesਗ਼৕৅ে ਑౪
਑౪
ਸச ਸச
ਗ਼৕৅ে
ਸச
ਗ਼৕৅ে
਑౪
830,1E

ਲਗ

Laserレーザー強度
Intensity

プラズマ密度উছ६ঐణ‫ش‬লৡ‫؟‬প‫ك‬ਘःউছ६ঐణ
大

A:'<>()D-6P6
ਗ਼৕৅েٔਸச
@&
ਗ਼৕৅ে
਑౪
ਸச
శ଍஄भణ

‫ق‬

830,1E
2*9B.5%
'!$=/C7  A:'
?
@&

A:'<>()D-6P6 ਗ਼৕৅েٔਸச
A:'<>()D-6P6


;+

ਗ਼৕৅ে

঩ম

ਘःউছ६ঐణ
‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬‫ق‬਍৒‫ك‬஺ਸச॑ॺছॖ

‫ق‬਍৒‫ك‬e-bunch
;+
঩ম

଍஄भణ

;+

१ঈ3:

;+
2*9B.5%
2*"# .5'!$=/C7 ?4
@&਑౪  1E
ਗ਼৕৅ে१ঈ3:ঞ‫ش‬२‫ش‬

ਲਗ

Small
ঞ‫ش‬२‫ش‬লৡ‫؟‬৵‫ك‬ൠःউছ६ঐణ
小‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬৵‫ك‬

‫ق‬
2*

଍஄भణ
2*"#.5  1E঩ম६ঐణৡ‫؟‬৵‫ك‬ൠःউছ६ঐణ

‫౐૆ق‬౦৲‫ك‬830,1E

৒ਙ॑੎ଳख‫ؚ‬੗
2*9B.5%
'!$=/C7 ?4@&
2*9B.5%
?4ਗ਼৕৅েٔਸ
ਗ਼৕৅ে

'!$=/C7஺ਸச॑ॺছॖ @&శ଍஄भణਘःউছ६ঐణ
-IV
-IV
-IV
830,1E
ਯ3:ঞ‫ش‬२‫ش‬‫ق‬ঞ‫ش‬२‫ش‬লৡ‫؟‬প‫ك‬ਈ੺म‫ؚ‬ਲਗु਍-IV
-IV
-IV
2*9B.5%
?4‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬ਯ3:ঞ‫ش‬२‫ش‬
'!$=/C7


@&
৒ਙ॑੎ଳख‫ؚ‬੗ਈ੺म‫ؚ‬ਲਗु਍‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬஺ਸச॑ॺছॖ
৒ਙ॑੎ଳख‫ؚ‬੗ਗ਼৕৅েٔਸச
-IV
-IV
-IV@&ਯ3:ঞ‫ش‬२‫ش‬
ਗ਼৕৅ে
਑౪
ਸச
追加速
位相回転
電子銃
஺ਸச॑ॺছॖ
Electronਈ੺म‫ؚ‬ਲਗु਍
QME.
Acceleration‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫ق‬7:‫ك‬‫౐૆ق‬౦৲‫ك‬
Sourceುਡ‫ٯ‬ᄌ༿पଡണর
ਗ਼৕৅েٔਸச !ਯ*H9‫ਂق‬਍৒‫ك‬৒ਙ॑੎ଳख‫ؚ‬੗
@&
ਗ਼৕৅ে
਑౪
ਸச
‫౐૆ق‬౦৲‫ك‬஺ਸச॑ॺছॖ
ਗ਼৕৅েٔਸச
@&!ਯ*H9‫ਂق‬਍৒‫ك‬ುਡ‫ٯ‬ᄌ༿पଡണর
ਗ਼৕৅ে
਑౪
ਸச

‫౐૆ق‬౦৲‫ك‬‫౐૆ق‬౦৲‫ك‬!ਯ*H9‫ਂق‬਍৒‫ك‬ುਡ‫ٯ‬ᄌ༿पଡണর
ುਡ‫ٯ‬ᄌ༿पଡണর

ਗ਼৕৅েٔਸச
ਗ਼৕৅ে
਑౪

37

37

@&
ਸச37

多段レーザー航跡場加速実験の概略
QME e-beam transport& Focusing to Booster

Short Focus OAP
F#~ 3, I~1019W/cm2

Injector

Pulse-driven
Beam Optics (Solenoid, Steering)
Supersonic
Gas-jetPlasmaLens
Effects
Pre-formed (Discharge)
Plasma Channel ~5cm

Pulse-driven Solenoid

Long Focus OAP
F#~ 20-40, I~1018W/cm2

GeV Classelectrons

Boosterfor Staging acc.

レーザー加速プラットフォーム’LAPLACIAN’ @ SPring-8

Control room Pump lasers
Pulse Compressor
X-ray Diagnostics
e-Beam-line
Plasma Diagnostics
Beam Dump 
 

4m
3m

m 
 20

Laser System

20 m

Injector
Booster

Micro-Undulator
e-Beam Monitor

レーザー航跡場加速研究に特化したユニークな超高強度レーザー装置‘レーザー加速プラットフォーム’
Ti:Sa ultrafast oscillator
Booster XPW

30 mJ at 527 nm

Stretcher + AOPDF
Regenerative ampliﬁer +AOPGCF +multi-pass ampliﬁer

30 µJ at 100 Hz
30 mJ at 527 nm

Front-end

3 mJ at 100 Hz
MP0 ampliﬁer

125 mJ at 532 nm
25 mJ at 10 Hz

MP1 ampliﬁer

2.5 J at 532 nm

200 mJ
at 10 HzMP2 ampliﬁer

100 mJ
at 10 HzMP3 ampliﬁer

Compressor1

Compressor2

Compressor3

1 J at 10 Hz, 20 fs

2 J at 5 Hz, 50 fs

10 J at 0.1 Hz, 100 fs

BL-1

BL-2

BL-3

2 x 2.5 J at 532 nm

Injector

1st!
Laser

2 x 4 J at 532 nm

Phase rotator

2nd Laser

E ~ a few - 10s MeV!
ΔE/E = 10 ~ 100% !

350 mJ
at 10 Hz
TWIN ampliﬁer

2 x 20 J at 527 nm

Booster3rd Laser

E ~ 10s MeV!
ΔE/E < 1 % !

E > 1 GeV!
ΔE/E ~ 1 % !

LAPLACIANの内部を動画で紹介
レーザー加速実験トンネルの内部

３ビーム同期チタンサファイアレーザーシステム

アンジュレーター光発生実験を開始

Injector

Booster

Q1,2

ESM-2

e-Beam

Q3,4

Undulator

まとめ• 高強度超短レーザーパルスとプラズマの相互作用で励起される加速電場は高周波加速器の1000倍以上の100GV/mもの超高電場。

• レーザー航跡場加速研究は基礎研究（原理実証）からリピータブルな高品質ビーム源開発のフェーズへとシフトしつつある。

• レーザー加速駆動の電子ビームの実用化に向けて必要なもの

・安定・リピータブルなドライバー（Ti:Sapphireレーザーの開発）
・プラズマの制御技術の確立（加速機構・入射機構の解明と相補的に）・実用に耐えるキーコンポーネントの開発
・加速器システムの構築
・アプリケーションの探索
・数百MeV級の電子ビームなら、すでに卓上サイズレーザー（〜J級）で利用可能
・極短パルス性、コンパクト性を生かして、生物・化学・医療への応用(研究者とのWGを立ち上げ中)
・物理分野への応用（例えば、高エネルギー分野の検出器校正用としての光源 etc. ）・理研SPring-8キャンパスにてオールジャパン体制の機関連携で研究開発を推進中・各種キーコンポーネント開発に必要な技術をお持ちお方々、加速器分野の方々、
極短パルスビーム利用にご興味をお持ちの方々、参加をお待ちしております！

ご静聴ありがとうございました。
今後ともご支援よろしくお願いいたします。
未来社会 LPA Web.
https://lpa.jasri.jp/

未来社会

レーザー駆動研究室Web.
https://www.sanken.osaka-u.ac.jp/labs/bmp/wordpress/index.php/home-jp/
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