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