Post on 28-Nov-2014
Advanced Accelerator Research &Development at JAERI-APRC
Kazuhisa NAKAJIMAKEK
JAERI-APRC
2nd ORION WORKSHOPSLAC, Feb. 18-20, 2003
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
Colleagues of Laser Acceleration Research Group
Colleagues of Laser Acceleration Research Group
Kazuhisa NAKAJIMAMasaki KANDO
Hideyuki KOTAKIShuji KONDOH
Shuhei KANAZAWAShinichi MASUDA
Takayuki HONMA
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
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( )
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
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
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
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
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
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
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
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
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
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
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)
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