kazuhisa nakajima- advanced accelerator research & development at jaeri-aprc
TRANSCRIPT
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Advanced Accelerator Research &Development at JAERI-APRC
Kazuhisa NAKAJIMAKEK
JAERI-APRC
2nd ORION WORKSHOPSLAC, Feb. 18-20, 2003
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Tokyo
KEK in Tsukuba
JAERI-KANSAI (West) in Kizu
Kyoto
Osaka
Spring-8 in Harima
? ?
Japan Atomic Energy Research CenterKansai Establishment
Advanced Photon Research Center
Director: Toshi Tajima
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Colleagues of Laser Acceleration Research Group
Colleagues of Laser Acceleration Research Group
Kazuhisa NAKAJIMAMasaki KANDO
Hideyuki KOTAKIShuji KONDOH
Shuhei KANAZAWAShinichi MASUDA
Takayuki HONMA
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OutlineProgress of laser-driven accelerators
Facility for laser acceleration research at JAERI-APRC
Prospects of laser accelerator developments
Recent topics on laser-plasma electron sources
Recent results on laser-plasma accelerationExperiments
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Direct Laser Field Accelerators
Inverse FEL
θ
vph c =1 ncosθ
Gasn=RefractionIndex of Gas
Axicon
LaserBeam
Inverse Cherenkov Accelerator
Particle velocity =Phase velocity < cGrating Accelerator
Inverse Smith-Purcell Effect
S
λθ
Grating
LaserBeam
vph c = 1 nλ S + cosθ( )n=integer
Ponderomotive accelerator
Plasma
vg< c
B
Undulator
λ
λu
u
λ = λu 1+ K2( ) 2γ 2;
VxB force
v
v c ♠1− 1+ K2( ) γ 2
Laser Beam
0.5 1 1.5 2 2.5 3
-1
-0.5
0.5
1Beat-Wave
t
A = A1 + A2
FzFz Fz
Vacuum Beat Wave Accelerator
v ph c ≅ 1− 1− Z R1 ZR2( )/ ∆kZR1( )
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Laser-driven Plasma Wave Accelerators
PBWA ω1 − ω 2 = ω p
SM-LWFAL > λp, P > Pc
LWFA L = λp
Plasma Beat Wave AcceleratorLaser Wake-Field Accelerator
Self-Modulated LWFA
Plasma
vg< c
Solitary wake accelerator
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Progress of Laser Acceleration Experiments
1970 2000 2010 2020
1 MeV
1 GeV
1 TeV
Ene
rgy
Gai
n
ILE
UCLA
LULI
KEK/ILE
JAERI/KEK/UT
RALMichigan
LLNL
1980 1990
1 PeV
ANL
KEK
SLAC
BNLNRLMPI
LULI
GeV Laser Accelerationat JAERI-APRC
GeV Laser Accelerationat JAERI-APRC
PBWALWFASM-LWFA
PWFAICF
Accelerationmechanism
Hadron colliders
e+e- colliders
Laser PonderomotiveEnergy trend
Laser PonderomotiveEnergy trend
Laser-plasma acceleration experiments demonstrated >200MeV, >100GeV/m electron acceleration.
Year
Conventional accelerator energy frontierConventional accelerator energy frontier
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Gas-Jet Plasma Cathode Experiments A table-top accelerator
Self-Modulated Laser Wake-Field Acceleration experiment at Univ. of Michigan
Gas jet LWFA experiment at LOA
(V.Malka et al.,SCIENCE,298,1596,2002)
Forced Laser Wake-FieldAcceleration (?) experiment
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Relativistic electron beam generation by ultraintense laser-plasma interactions
2.0 mm
Nozzle
1.3 mm
~2mm
Plasma
180mm
θ ~30deg.
θ ~2deg.
< 500keV
up to ~40MeV
I. P.
D~10mm
E
E:Self-channeling
Lower energy electrons
Energeticelectron beam
Ti:Sapphire
He 20 atm (~2.8x1019cm-3)
Relativistic electron beam generation experiment at Univ. of Tokyo
5 TW, 50fs
Laser pulse
Intensity ~1.5x1019W/cm2
Emax ~ 40 MeV
a0 ~3.0
Transverse emittance~ 0.05 πmm· mrad
1 00
1 01
1 02
0 5 1 0 1 5 2 0 2 5 3 0 3 5 4 0
Energy [MeV]
High quality electron beam
by T. Hosokai
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Facility for Laser Acceleration Research
Laser
CPA Ti:sapphire laser systemPeak power 100 TWPulse duration 20 fs
1 PW
ElectronBeamInjector
Microtron with photocathode RF gun
Beam energy 150 MeVBeam intensity 100 pC, 10-60 HzBunch duration 10 psNorm. emittance <5 π mm-mrad
Beam line with laser energy modulationand chicane section.
Laser transport
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CPA Peak Power Toward the Petawatt
10 -1
10 0
10 1
10 2
10 3
10 4
1988 1990 1992 1994 1996 1998 2000
Nd:glassTi:sapphireCr:LiSAFE
Pea
k P
ow
er (
TW
)
Year
Rochester
ILELLNL
ILE Limeil
LLNL
LLNL (single shot)
JAERI (10 Hz)
JAERI
ENSTA
LLNL
UCSD
ISSP
WSU
Stanford
UC Berkeley
Stanford ENSTA
CREOL LLNL
LLNL (single shot)
PetawattPetawatt
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The 10-1000 TW Laser Systemat JAERI-APRC
CW Nd:YVO4
7 J,
10-
Hz
Nd
:YA
G
1Hz
Pu
mp
Las
er
(Un
de
r D
evel
op
men
t)
10-Hz Nd:YAG
10-Hz Nd:YAG
Sin
gle
-Sh
ot
Nd
:Gla
ss P
um
p L
aser
Stretcher Regenarative Amplifier
8 mJ
4-Pass Pre-amplifier
4-Pass Power amplifier
Booster Amplifier
100
TW
C
om
pre
sso
r
10
TW
C
om
pre
sso
r
Air
C
om
pres
sor
PW
C
om
pre
sso
r
Oscillator
1PW,25fs, 1Hz100 TW, 20 fs, 10 HzTi:Sapphire Laser Systemat JAERI Advanced PhotonResearch Center in Kyoto
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Laser Peak Intensity (Optical Measurements)
12µm
12µm
Spot Image2.6x1019 W/cm2
53 %74 %Energy in 1/e2
Spot Area (%)
5.9x1018 W/cm2Laser-focusedPeak Intensity (Calculation)
6.4 µm7.0 µmSpot Size(FWHM)
25 fs20 fsPulse Width
(FWHM)
530 mJ80 mJPulse Energy
Power-amplifierPre-amplifierAmplifier Stage
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Schematic of the Petawatt Ti:Sapphire System
45 mJ Green Pump
Oscillator10 fs
Stretcher1 ns
Regenerative Amplifier8 mJ, 10 Hz
4-pass Preamplifier320 mJ, 10 Hz
4-pass Power Amplifier3.3 J, 10 Hz
3-pass Booster Amplifier~40 J, Single Shot
Compressor25 fs, 28 J, 1.1 PW
6.4 J Green Pump~70 J Green Pump
Additions for the petawatt
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Major Petawatt Components
Petawatt vacuum compressor
40 cm compression grating
8 cm diameter Ti:sapphire disk80-mm Ti:Sapphire disk
70-J green Nd:glass laser
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Offner Stretcher and Compressor with Mixed Grating Scheme
1200 grooves/mm Offner Stretcher
Output Input
1480 grooves /mm Tracy Compressor
Wavelength (nm)
Inte
nsity
(a.
u.)
Bandpass ~100 nm
J. Squier et al, Appl. Opt. ,vol. 37, 1638, 1998
Dazzler (planned)
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Optical table size ~ 90 m2
PW compressor
StretcherRegen
Pre - amp
Power - amp
Booster - amp
100TW compressor
Nd : glass
Oscillator
Nd : YAG
Tables-Top Petawatt Ti:Sapphire Laser System