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Laser-electron beam interactions

group activities

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Applications of Compton scatteringe- beam+ laser e- + X/g ray

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Ee 1GeV

g ray 100 MeV

Low energy applications•Medical: radiography &radiotherapy•Museology …

High energy applications • Compton polarimeter

gg collider• Polarised positron

source…

X ray 10-100keV

E(X/g) MeV

Ee20-100MeV Ee 100-1000MeV

Nuclear fluorescence applications•Nuclear physics•Nuclear survey•Nuclear waste management…

g ray 1MeV

ThomX

ELI-NP

MightyLaser

(POSIPOL)

E(e- beam) MeV

llaser=1mm

Introduction to POSIPOL (MightyLaser)

• Polarized e+ by laser Compton Scheme for ILC/CLIC

Ee~1GeV for 10MeV gammas

easy to control polarization

Toward the positron sources -> increase intensity of gamma rays

Courtesy of Omori-san

Biggest issue:The laser beam power… R&D effort

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MightyLaserFrench Japanese Collaboration(close work, regular meetings since 2005)

Araki-san

K. CassouY. ChaikovskaN. DelerueA. MartensP. Favier

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Boxes opened 26 july 2010Total weight~3 tons37°C in the ATF hall !

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electrons

Te

TR

T DFcep2DFcep

femtosecondOscillator

(40-200MHz)

High averagepower

amplifier

Feedback system Dn/n 10-12

+ synchronisation(metrological techno.)

Opticalcavity

Goals: stack as much average power as possible in an optical resonator1MW & produce high flux of circularly polarized g-ray at ATF/KEK

MightyLaser 2008-2013 (R&D setup 2013)

X or g rays

Quasi monochromaticX or g rays

collimator

High flux quasi-monochromatic X/g ray Compton sources

Compton Experiments at ATF

1.3GeV up to 10 bunches/train

Cavity gs

French and Japanese Cavities

Highest g-ray fluxobtained fall 2013

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Future: ThomX

Laser and FP cavity

Cycle Frep = 20 msecRF pulse length 3 msEnergy 50 - 70 MeV

2 IpsEasy integrationFrees the straight sectionsCSR line

~10m

~7m

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ThomX: a machine turned toward societal applications

• Transfer of the SR techniques to these new machines. Many fields can be interested…• At present two contributors: *Medical field (ESRF, INSERM Grenoble)

*Cultural Heritage (C2RMF CNRS – Louvre Museum) LAMS(Archeology Labs.)

K-edge imaging

K-edge imaging (Pbwhite, Hg vermilion…) of a Van-Gogh’s paintingJ. Dik et al., Analytical Chemistry, 2008, 80, 6436

PaleontologyNon-destructive analysis

Physiopathology and Contrast agents, Dynamic Contrast Enhancement SRCTConvection Enhanced Delivery =>Stereotactic Synchrotron RT

Imaging,MammographyMicrotomography

J Cereb Blood Flow and Metab, 2007. 27 (2):292-303. Journal of Radiology 53, 226-237 (2005)

Biston et al, Cancer Res 2004, 64, 2317-23

Acknowledgments to G.Le Duc, P.Walter

Phase contrast imaging

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X-ray line for performing X-ray

experiments

Fully funded, under construction since

2012

Commissioning expected beginning

2016

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ELI-NP g-ray beam(European answer to a EC tender)

S&C band 700MeV e- LINAC with 2 Compton IPsBucarest(Nuclear applications)

High flux, small bandwidth g-ray beam(~100 better than state of the art)

& entreprises• Alsyom• Amplitude• Comeb• Scandinova

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LAL contribution to ELI-NPDesign, alignment, synchronization, commissioning of a 32-pass 3D recirculatorHigh precision ‘aberration free’ optical setup

o <100fs synchronizationo Tolerances & cleanliness & damage

issues similar to Laser Mega JouleClose collaboration with ALSYOM CO. in charge of manufacturing ,optical pre-alignments, installations

30cm

Contract signed in march 2014Work up to 2018(LAL has the responsibilityof the optical systems)

Summary

HERA/DesyComptonPolarimeter20002004

ATF/KEKMightyLaserR&D polarized

positron source

OrsayR&D polarizedpositron source20042007

Past Present/futur

OrsayThomX

R&D on high finesse cavity High average laserpower optomecanics, Compton interaction exp.world best finesse in ps & 200fs regimeR&D to be continued to reach 1MW…

Creation of the LAL Accelerator Dpt.Accelerator projects built aroundhigh finesse cavity and optical recirculator

RomaniaELI-NP-GS