laser plasma accelerators: from dream towards...
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Laser Plasma Accelerators: From Dream Towards Reality
Wim Leemans
CAMOS meeting
April 5, 2011
LOASIS Program, LBNLUC Berkeley
Laser
Injector Acceleration section
0.1-1 GeV
<-------------------- 3 cm ------------------->Tuesday, April 5, 2011
2
SLAC 50 GeV
7 TeVLHC
Accelerators: drivers for science
DNA
Tuesday, April 5, 2011
Accelerators: from handheld to size of a small country
3
Size x 105 Energy x 109
1929 LHC, 2010
30 MJ stored energy
Tuesday, April 5, 2011
Laser plasma acceleration enables development of “compact” accelerators
3
m-scale
100 micron-scale
10 – 40 MV/m
10 – 100 GV/m
Plasmas sustain extreme fields => compact acceleratorsCan this technology be developed for energy frontier machines, light sources, medical or homeland security applications?
Tuesday, April 5, 2011
• Basic concept of laser plasma acceleration
• Controlling particle injection
• LPA as building block for a hyperspectral source
• Laser technology and investments
• Conclusion
OUTLINE
Tuesday, April 5, 2011
Blow-out or bubble regime: the highly non-linear regime
Laser
Laser
Laser
(1) (2)
(3) (4)
++ +Laser
Tuesday, April 5, 2011
7
• E-fields: 10 – 100 GV/m => compact accelerators
Principle of Laser-Plasma Accelerators
Non-Linear (bubble/blow-out)
Laser beam
Laser
Electrons
Linear
Tuesday, April 5, 2011
Building a laser plasma accelerator following conven5onal linac paradigm
‣ Field excita+on
‣ Accelerator structure and length
‣ Electron injec+on
‣ Laser
Laser Injector Plasma Channel
Leemans et al., IEEE Trans. Plasma Science (1996), Phys. Plasmas (1998)Leemans and E. Esarey, Physics Today, March 2009Esarey, Schroeder and Leemans, Rev. Mod. Phys (2009)
Tuesday, April 5, 2011
Technical challenges in next 10 years
Multi-GeV beams
Lasers: high average power
Modeling
High quality beams
laser laser
Staging, optimized structures
100 TW, 10 Hz
BELLA 1PW, 1 Hz
Diagnostics/Radiation sourcesTuesday, April 5, 2011
Channel Guided Laser Plasma Accelerators – 2004 result
C. G. R. Geddes et al, Nature,431, p538 (2004)
10 TW laser => 100 MeV e-beam
Tuesday, April 5, 2011
15
Going to higher beam energy
electrode
gas in 0V+V
bellows
sapphire channel
laser in
§ Gas ionized by pulsed discharge§ Peak current 200 - 500 A§ Rise-time 50 - 100 ns
D. J. Spence & S. M. Hooker Phys. Rev. E 63 (2001) 015401 R; A. Butler et al. Phys. Rev. Lett. 89 (2002) 185003.
sapphire channel
Tuesday, April 5, 2011
A GeV module…
Tuesday, April 5, 2011
17
Experimental set-up
W.P. Leemans et. al, Nature Physics 2, p696 (2006)
40 TW laser => 1 GeV e-beam
Channel Guided Laser Plasma Accelerators – 2006 result
Tuesday, April 5, 2011
• Basic concept of laser plasma acceleration
• Controlling particle injection
• LPA as building block for a hyperspectral source
• Laser technology and investments
• Conclusion
OUTLINE
Tuesday, April 5, 2011
9
Operation in bubble non-linear regime: limited control
Courtesy of W. Mori, UCLA
§ High gradients§ Can produce narrow energy spread beams
BUT
§ Limited control§ Self-trapping (dark current)§ Can easily go unstable
Tuesday, April 5, 2011
Electrons surfing on a wave: controlled injection
Injected Electrons Injected Out of Phase
Self Injection
Trapping requires:-Tsunami- Boost electrons or slow down wave
Tuesday, April 5, 2011
n Couple (short, high plasma density) injector to (long, low density) plasma channel:
Integrated injector and accelerator for stability, improved beam quality
~GeVelectron beam
accelerator: ~cm, n~1018 cm-3
laser
z
Injector, ~mm, n~1019 cm-3n
RZ
n Two effects control wave’s phase velocity:
n Negative density gradient -> plasma wavelength increases
n Laser focus -> relativistic self-focusing results in plasma wavelength increase (decrease) before (after) focus
A.J. Gonsalves et al., submittedTuesday, April 5, 2011
Practical implementation of combined injector and acceleration stage
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18
laser
Injector Acceleration section
Tuesday, April 5, 2011
19
Tunable electron beams produced via laser focus control using jet+capillary module
0
0.1
Charge density (nC/MeV/SR)10 3020
20m
rad
Jet only, Jet and capillary
a) !x = 3.00 mmfGas jet ONLY
100 200 300 400Energy (MeV)
0
0.02
0
0.02
0
0.02
0
0.02
0
0.02 Charg
e d
ensity (p
C/M
eV
)
200 400
Angle
b) !x = 0.65 mmf
c) !x = 1.62 mmf
d) !x = 2.62 mmf
e) !x = 3.62 mmf
f) !x = 4.62 mmf
Jet +
cap
illar
y
A.J. Gonsalves et al., submitted
Energy variation <1.9 % rmsCharge variation < 4% rmsDivergence change < 0.57 mrad rms
3636Tuesday, April 5, 2011
20
Peak jet density (10 /cm )19 3
0
100
200
1.3 1.42
6
10
14
Energ
y of p
eak (M
eV
)Lase
r transm
ission (%
)
Laser transmission
Charg
e (
pC
)
ChargeEnergy of peak
g)
Tunable electron beams produced via gas jet pressure control in integrated structure
A.J. Gonsalves et al., submitted
Tuesday, April 5, 2011
• Basic concept of laser plasma acceleration
• Controlling particle injection
• LPA as building block for a hyperspectral source
• Laser technology and investments
• Conclusion
OUTLINE
Tuesday, April 5, 2011
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•! >1?51+)#&,)"($*,-&
–! I<2B8B70,0B8>2B80=,BF9//9<7,
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–! @2(1B,&1#?&61991&(1B,&
Tuesday, April 5, 2011
Radiation from THz to Gamma Ray – synchronized and ultra-short
Thomson Scattering – Multi keV/MeV x-ray/gamma ray
Betatron radiation during acceleration – Multi keV
Free Electron Laser-> XUV, x-ray
e-beam
Transition radiation from beam exiting plasma – MV/cm THz
Laser
Laser
Tuesday, April 5, 2011
22
PlasmaLaserElectrons
Leemans et al. PRL 2003; POP2004; IEEE2005 Schroeder et al., PRE 2004;van Tilborg et al., Laser Part. Beams2004; PRL2006; POP2006; Optics Lett. 2006
Intense THz source• 0.01-10 MV/cm at focus (up to 10’s of µJ in THz pulse)• ‘traditional’ laser-based sources deliver <100 kV/cm
Tuesday, April 5, 2011
Single shot THz detection technique developed
ChirpedProbe Pulse
to spectrometer
Polarizer
EO XtalE-field: E(t)λ/4 plate
Modulated Probe
Matlis et al, Submitted to JOSA B
Short ReaderPulse
TEX-ogramTemporal Electric-field Cross-correlation (TEX)
23
OAP
OAP
THz
Probe
Leemans et al., Phys. Rev. Lett. 91(7) 074802 (2003)Schroeder et al., Phys. Rev. E 69, 016501 (2004)van Tilborg et al., Phys. Rev. Lett. 96, 014801 (2006)
Tuesday, April 5, 2011
26
THz from Laser Accelerated Bunches ready for “user” experiments
• THz source properties
• ETHz ~ 1-5 MV/cm
• High frequency 0.5-10 THz
• Intrinsic synchronization with laser, electrons, x-rays, etc.
• Single shot time-space resolved THz waveform measurement*
• Pump-probe experiments:
• Superconducting material studies (e.g., breaking of Cooper pairs)
• Non-linear carrier dynamics in semi-conductors
* N.H. Matlis et al., JOSA-B 2011Tuesday, April 5, 2011
LBNL
MPQ
PLASMON-X
World-wide effort aimed at FEL using laser accelerator
Taiwan
Spontaneous emission 17 nm (@ MPQ-Garching)
Main challenges:➡ Beam quality: ➡ Energy spread, emittance, peak current
➡ Seeding for temporal coherence
BPM
Capillary ICT
Quads
Magnetic Spectrometer
Undulator
XUV spectrometerICT
OTRFoil
Laser Plasma Accelerator
Tuesday, April 5, 2011
Beam brightness studies are underway
Transition radiation from beam exiting plasma – coherent THz
§ Bunch duration:§ Fluctuational interferometry (Catravas et al., PRL 1999)
§ THz radiation -- upper bound (van Tilborg et al., PRL2006)
§ Coherent OTR -- mm scale distance from LPA (Glinec et al., PRL2007, Lundh et al., NP 2011)
Coherent optical radiation
Single shot X-Ray Image
§ Emittance & energy spread:§ Betatron source size and e-beam divergence (Plateau et
al., in preparation)
§ Slice energy spread via coherent OTR (COTR) -- meter scale distance from LPA (Lin et al., submitted)
§ Undulator based diagnostic
Tuesday, April 5, 2011
§ K = γ kβ rβ ∝ γ1/2 ne1/2 rβ
Ultra-low emittance of electron beam is deduced from x-rays produced by electrons inside LPA
Single shot X-Ray Image
Normalized emittance < 0.2 micron1 G. Plateau et al., in preparation (2011)2 E. Esarey et al., PRE 65 056505 (2002)3 M. Chen et al., In preparation (2011)
Electron beam spectrum
X-ray spectrum
Tuesday, April 5, 2011
30
Undulator radiation experiment: towards an FEL powered by LPA
BPM
Capillary ICT
Quads
Magnetic Spectrometer
Lanex
Undulator
Blazing IncidenceGrating
X-ray CCDICT
OTRFoil
Single shot energy spread and emittance diagnostic
Single-shot XUV SpectrometerBPM & OTRTHUNDER Undulator
outer diameter:!35 mm"
clear aperture: !
5 mm"
25 and 50 mm"
Tuesday, April 5, 2011
Experiments on seeding the FEL being planned
Benefits of HHG seeding FEL• Reach saturation at shorter distance• Stabilize output flux• Improve temporal coherence
Tuesday, April 5, 2011
Laser-plasma accelerator driven soft x-ray FEL at 1 nm
LPA electron beam:Beam energy 7.7 GeV Peak current 30 kABunch length 20 fsRelative energy spread 10-3
Normalized emittance 1 micronAv
erag
e fu
ndam
enta
l pow
er <
P>
(W)
Undulator length (m)
Ginger simulation
Laser beam
7.7 GeV, electron beam
FEL output
~ m
plasma channel1017 cm-3
40 J, 100 fs1018 W/cm2
1 Hz
Undulator ~ 15 m
λ=1 nm~1013 photons/pulse
Requires nominal 10 GeV LPA
Tuesday, April 5, 2011
33
BELLA Facility: state-of-the-art PW-laser for laser accelerator science
BELLA LaserControl Room Gowning Room
Compressor
Plasma source 10˚ Off-axis parabolaHigh power diagnostic
Tuesday, April 5, 2011
BELLA is expected to be available by summer 2012
34
BELLA Laser at THALES
“Front end (50 TW, 10 Hz) >14 J GAIA pump laser
Tuesday, April 5, 2011
35
BELLA laser opens significant opportunities
< 100 cm1000 TW40 fs
e- beam
~10 GeVLaser
• Light source development- 10 GeV Module as driver for 1 nm seeded soft x-ray FEL
2013 Experiments
Lorentz boosted frame simulationFull 1 m BELLA stage -- major advance
Courtesy of J.-L. Vay
W. Leemans et al., AAC2010 Proceedings
Tuesday, April 5, 2011
• Basic concept of laser plasma acceleration
• Controlling particle injection
• LPA as building block for a hyperspectral source
• Laser technology and investments
• Conclusion
OUTLINE
Tuesday, April 5, 2011
Concepts are being explored towards a Laser Plasma Linear Collider
§ Injector techniques
§ Staging techniques
§ Bunch properties
§ 10 GeV module
§ Collisions, synchrotron losses, efficiency, etcW. Leemans and E. Esarey, Physics Today (2009); C.B. Schroeder et al., PRST-AB 2010
Tuesday, April 5, 2011
Laser plasma
accelerator (today)
Collider(>20 yrs)
Lightsource(10 yrs)
Security Apps
(5-10 yrs)
Medical(10 yrs)
Laser development
Tuesday, April 5, 2011
Light sources
Laser requirements:
Peak power vs. Rep rate
1 MHz1 kHz1 Hz
100 PW
1 PW
1 TW
BELLA
TREX
Godzilla
CollidersMedical Apps
Laser based non-linear QED
40 W
4 kW
400 kW
Tuesday, April 5, 2011
Novel lasers and materials are being developed
‣ Amplifiers
-‐ Rods, slabs, discs and fibers
40
‣ Materials for amplifiers, mirrors and compressor gra5ngs
-‐ Ceramics and diamond
-‐ Nano-‐fabricated structures
‣ Diodes and small quantum defect materialsTuesday, April 5, 2011
Laser-‐plasma accelerator based hyperspectral user facility
Compact, intrinsically synchronized hyperspectral source covering THz to gamma rays using laser based sources and laser plasma accelerators (LPA)
• Builds on know-‐how and technology for new accelerators• New paradigm: single laser system driving mulFple tunable compact LPAs
Laser driver Undulator
plasma channel
electron beam
~3-‐100 cm
Undulator ~3-‐100 cm
Undulator ~3-‐100 cm
XUV||X-‐rays
25-‐35 m
Seeding
Tuesday, April 5, 2011
42
Major investments- Example: European Extreme Light Infrastructure- Four pillars (three funded at 790Meuro):1. attosecond and XUV science: Hungary2. High-brightness x-ray and particle sources: Czech Republic3. Photo-nuclear science, transmutation,...: Romania4. Ultra-high intensity science (non-lin QED): ???
Tuesday, April 5, 2011
43Courtesy of K. Osvay
Funded at 790 Meuro
Tuesday, April 5, 2011
Conclusion‣ Laser plasma accelerators are reaching AMO relevant performance
-‐ High peak field THz for non-‐linear carrier dynamics, superconducFng R&D
-‐ Direct e-‐beam based magneFc switching
-‐ FEL proof-‐of-‐principle experiments, including seeding + user experiments
‣ In 5-‐10 years: BELLA style technology based user facility for peak power hyperspectral source apps
‣ User apps will require investment in high average power laser technology
-‐ Mul5-‐kW 100 TW to PetawaN-‐class lasers
-‐ Sustained, long range R&D needed with major investment in high peak power lasers, novel materials and fiber Fming technology & partner with universiFes, labs and industry
-‐ Major investments being made overseas
‣ Exci5ng 5mes to work on accelerator and laser driven science44
Tuesday, April 5, 2011
Team, collaborators and fundingPrimary collaboratorsPostdocs
K. Nakamura (E)M. Chen (S)C. BenedeR (S+T)T. Sokollik (E)
StudentsM. Bakeman (PhD) -‐-‐ gradua+ng 2011D. Bakker (MSc)C. Koschitzki (PhD)C. Lin (PhD) -‐-‐ gradua+ng 2011R. MiYal (PhD)D. MiYelberger (PhD)G. Plateau (PhD) -‐-‐ gradua+ng 2011B. Shaw (PhD) S. Shiraishi (PhD)L. Yu (PhD)
StaffS. Bulanov (T, UCB)E. Esarey (T)C. Geddes (S+E)A. Gonsalves (E)W. Leemans (E)N. Matlis (E)C. Schroeder (T)C. Toth (E)J. van Tilborg (E)
Eng/TechsR. DuarteZ. EisentrautA. MaganaS. FournierD. MunsonK. SihlerD. SyversrudN. Ybarrolaza
• LBNL: M. BaYaglia, W. Byrne, J. Byrd, W. Fawley, K. Robinson, D. Rodgers, R. Donahue, Al Smith, R. Ryne, P. Colella, J. Johnson• TechX-‐Corp: J. Cary, D. Bruhwiler, et al. SciDAC team• Oxford Univ.: S. Hooker et al.• DESY: F. Gruener, J. Osterhoff et al.• LOA: O. Albert• GSI: T. Stoehlker, D. Thorn• Trieste: F. Parmigiani
BELLA Project Team membersS. ZimmermannJ. CoyneD. LockhartG. SanenS. Walker-‐LamK. Barat
Tuesday, April 5, 2011
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