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Chang Hee Nam
Center for Relativistic Laser Science (CoReLS),
Institute for Basic Science (IBS) &
Gwangju Institute of Science and Technology (GIST),
Korea
Fisch-fest 2016. 3. 30.
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Atomic field strength: 9
25.1 10 V/cm;B
B
eE
r
216 23.5 10 W/cm
8
BB
cEI
Relativistic Laser Intensities
Intensity for relativistic electron:
(Relativistic regime)
182 2
Re 02
1.4 10W/cm
m
I a
Intensity for relativistic proton:
(Ultra-relativistic regime)
242
2
4.5 10W/cmRp
m
I
0 00 2
0
speed of nonrelativistically oscillating electron
speed of light
NR
e e
v eE eAa
c m c m c
0When 1, 0.7 .a v c 0For 1, relativistic.a
0For 1800, ultra-relativistic.p
e
Ma
m
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Research Groups at CoReLS, Inst for Basic Science
Exploration of Relativistic Laser-Matter Interactions using
Ultra-high Intensity Lasers
Super-intense Laser
Atto/Zeptosecond
Science
Relativistic
Laser-Matter Interactions
Novel Applications
Relativistic
Laser-Plasma
Theory
Laser Group
High Density Laser Plasma G.
Low Density Laser Plasma G. Atto Science Group
Laser Plasma
Theory Group
High Energy Density
Physics Group
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Overview
1. PW Ti:sapphire laser
2. Laser wakefield electron acceleration
A. LWFA with PW lasers
B. Compton backscattering – MeV g-ray
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PW Ti:Sapphire Laser at CoReLS
• PW Ti:Sapphire Laser
(1) Beam line I: 30 fs, 1.0 PW @ 0.1 Hz
(2) Beam line II: 30 fs, 1.5 PW @ 0.1 Hz
• 100-TW Laser: Dt = 30 fs, E = 3 J @ 10 Hz
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Upgrade: High Contrast, 20 fs, 4 PW Laser
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Installation of 4-PW amplifier
4-PW amp.
1-PW beamline
1.5-PW amp.
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2nd & 3rd Gratings
807 mm
417
mm
1st & 4th Gratings
565 mm
360
mm
Pulse Compression Gratings
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1. PW Ti:Sapphire laser
2. Laser wakefield electron acceleration
A. LWFA with PW lasers – 10 GeV e- beam
B. Compton backscattering – MeV g-ray
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PW Laser Experimental Area
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High-energy electron beam (>400 MeV)
injected to the second gas jet
Investigation on multi-jet configuration
with high energy electron injection
Charge of electron beam (4+10 mm):
~ 80 pC (> 0.5 GeV), ~10 pC (> 2 GeV)
Double-stage Gas jet
de = 2x1018 cm-3 (4 mm) ; de = 0.7x1018 cm-3 (10 mm) Electron energy spectrum
0
200
100
dN
/dE
(pC
/GeV
)
Energy (GeV)
0.4 0.5 1.0 2 3 5
Multi-GeV e-Beam Generation with Dual Gas Jets
HT Kim et al., PRL (2013)
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Coherent Control of Laser-Matter Interactions
2 3
0 000 1 2 3( ) ...
1! 2! 3!
spectral phase:
where
0
2
2 2
d
d
= group-delay dispersion (GDD) = linear chirp ,
0
3
3 3
d
d
= 3rd –order spectral phase (TOD) = quadratic chirp
GDD>0
GDD<0
TOD>0
TOD<0
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LWFA with chirp-controlled PW laser pulses
Spectral Phase
Control
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Control of spectral phase: GDD
26 J on target, focal spot ~ 35 micron, Ne = 1.4x1018 cm-3, 10 mm cell length
Plasma image (top view)
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Electrons over 2 GeV from a 10-mm gas cell
Gas cell length = 10 mm
Positively chirped 61 fs
Intensity = 2x1019 W/cm2 (a0=3)
Top view (Thomson scattering)
Electron energy > 2 GeV
0
500
1000
1500
2000
dN
/dE
(a
rb.
un
its)
4.0 3.0 2.0 1.5 1.0 0.7
Electron energy (GeV)
Electron energy spectrum
Smooth propagation over the
whole medium length of 10 mm
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All-Optical Compton Experiments
Laser Compton g-ray production via interaction of
GeV e-beam with a laser beam of 1018 - 1022 W/cm2
Compton backscattering:
MeV-Gamma beams useful for photo-nuclear physics
Nonlinear Compton Scattering:
Measuring radiation reaction effects
Energy loss and radiation damping (cooling) of
the electron beam
Assessing QED
Electron-positron pair creation: Only one experiment with 46.6 GeV linac e-beam and a0 = 0.36
D.L. Burke et al., Phys. Rev. Lett. 79, 1626 (1997)
0e n e g
0e e g
0n e eg
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Optical Layout for LWFA with the 4 PW laser
400
55
400
55
PW
Pu
lse
Co
mp
ress
or
아크릴
아크릴
P-0
1
JIS
14
"
JIS
14
"
JIS14"
231.4
Gamma-ray spectrometer
1.3T
JIS14"
JIS14" JIS14"
JIS14"
JIS14"
아크릴
아크릴
JIS14"
4 PW compressor 1 PW compressor
Deformable
mirror chamber
Target chamber
1-m
dipole
magnet
15-m
focusing
mirror
Gas cell Holed mirror Magnet
(30-cm)
ᵞ detector LWFA
beam
Colliding
beam
Deformable
mirror
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PW Laser Experimental Area (’16. 3.)
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Challenging Tasks
1. Coherent control of LWFA
Propagation calculation of chirped PW laser pulses in gas
2. Radiation reaction
Observable laser intensity
Transition from classical to quantum processes
3. g-ray production from Compton backscattering
nonlinear Compton scattering:
4. Pair production from photon-photon interaction:
Breit-Wheeler process:
0e n e g
0n e eg
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Summary
1. Two PW laser beamlines, 1 PW and 1.5 PW at 30 fs, at
CoReLS of IBS are operational for research on high field
science. One beamline is being upgraded to 4 PW.
2. Laser wakefield acceleration has been explored. With the
two-stage acceleration 3-GeV electron beam was generated.
Using the coherent control of LWFA process with PW laser
pulses monoenergetic electron beam over 2 GeV was
stably produced from a 1- cm gas cell.
3. After the 4 PW laser upgrade we are expecting to achieve
electron beams over 10 GeV.
4. Compton backscattering of PW laser pulses with multi-GeV
electron beam are being prepared for 10’s MeV g-ray
production. Radiation reaction and pair production will be
examined.