Brigitte Cros, 2nd Eucard-2 meeting, Barcelona, April 2015 Accelerator R&D in the frame of the CILEX...

Brigitte Cros, 2nd Eucard-2 meeting, Barcelona, April 2015

Accelerator R&D in the frame of

the CILEX project in France

Brigitte CROS LPGP-CNRS-Université Paris Sud

1


Contributions

2

A. Specka1, B. Cros2, P. Monot3, T. Audet2, A. Beck1, M. Bougeard3, C. Bruni4, A-M. Cauchois1, A. Chancé5, N. Delerue4, O. Delferrière5, F. Desforges2, S. Dobosz Dufrénoy3, M. Grech6, P. Lee2, A. Maitrallain3, J.R. Marquès6, Ph. Martin3, G. Maynard2, A. Mosnier5, P. Mora7, B. S. Paradkar2, J. Schwindling5, K. Ta Phuoc8, T. Vinatier4, P. Audebert6, F. Amiranoff6

1 LLR, Ecole Polytechnique, CNRS, Palaiseau France2 LPGP, CNRS, Université Paris Sud, Orsay, France3 LIDyL, CEA, IRAMIS, Centre de Saclay, France.4 LAL, CNRS, Université Paris Sud, Orsay, France5 SACM, CEA, IRFU, Centre de Saclay, France.6 LULI, Ecole Polytechnique, CNRS, CEA, UPMC, Palaiseau, France7CPhT, Ecole-Polytechnique, CNRS, Palaiseau, France.8 LOA, ENSTA, Ecole-Polytechnique, CNRS, Palaiseau, France.

http://llr.in2p3.fr/







Outline

• Overview of the CILEX project• Multi-stage LPA studies: objectives and

organisation of work• Ongoing work : injector, beam

transport, accelerator• Summary

3


Centre Interdisciplinaire Lumière EXtrême

4

CEA - Saclay

Université Paris Sud

Soleil

Orme des merisiers

1km

EcolePolytechnique

ENSTA

Institut d'Optique

Research Centre on Intense Lasers, Plasmas and Applications


Multi-PW laser APOLLON 10PW Multi-beam facility 1 PW + probe + ns

Dedicated experimental areas

Satellite facilities UHI100 Multi-disciplinary program

Training of scientists and engineers

Operated as a user-facility

Implementation at l’Orme des merisiers


long focal-length areashort focal-length area

Apollon laser Hall

Layout of the Apollon facility

6 6

Highest intensity

Solid targets

Ion acceleration

Radiation generation

High intensity

Gas targets, large volume

Electron acceleration

Radiation generation

Electron/photon interaction


4 Apollon Laser beams will be distributed in target areas

7

• Energy can be varied step by step• Synchronisation (master beam and delay lines)• Repetition rate: 1 shot/min

10PW: 15fs – A few ps, 150J, 75J, 50J, 25J

ns beam: 200J, uncompressed

1PW: 15fs – A few ps, 15J, 10J, 5J, 1J

probe beam: <20fs, 0.25 J


Operation as a user facility

8

• Apollon facility will be opened to national and international users

• Beam time allocation per year– 30 weeks for users– 10 weeks maintenance– 10 weeks development

• Beam delivery to experimental areas– Each experimental area will receive the beam for scheduled

periods of time– Laser pulse sequences will be delivered at the request of users,

6 hours per day– Tentatively, 2 days will be allocated for changing the laser beam

configuration between experimental areas


Motivation for Laser Plasma Acceleration in the frame of CILEX

• Study the feasibility of a laser plasma accelerator scalable to high particle energy– > High gradient technology and meter scale stages

• Implement a test facility for laser plasma acceleration studies: build a community of physicists

• Develop a reliable relativistic electron source for applications: build a community of users

9

B. Cros et al, NIMA 740 27 (2014)


Work is planned in 3 phases

• PHASE 1: 2013-2016 Design experiments in Long Focal-length Area (LFA)

Research program on other facilities Conceptual & technical design of the experimental set-up Procurement & implementation of equipment in LFA

• PHASE 2: 2016-2017Commissioning of the 1st PW beam and facility through the mechanism of LPA in the bubble regime Validation of laser specification (I < 1020 W/cm2, a0< 7) Comparison to scaling laws and exploratory experiments Injector optimization

• PHASE 3: 2018-2019Develop a two stage Laser Plasma Accelerator (Injector/accelerator)Electron beam transport , focusing, synchronisation, and injection into a plasma wave over a long distance

10


First stage (bubble regime operation) provides high gain. Second stage (linear/moderately non-linear operation)

provides control and stability. Scalability : Energy gain while maintaining beam properties Experimentally challenging : each component requires state-

of-the-art equipment and know-how

Multistage LWFA to achieve stable tuneable electron source

11

Electron Beam

Focusing Optics

Bubble regime operation inside a short gas cell

First stage Laser

Laser for second stage

Moderately non-linear regime operation inside a long dielectric capillary tube


Design of two stage LPA in the long focal length area of Apollon facility

12

1 PW (15 J, 15 fs) laser: first stage driver

10 PW (150 J, 15 fs) laser: second stage driver


Components are developped separately to prepare implementation in the Long

Focal-length area of Apollon facility

13


1st Stage (ELISA): ELectron Injector for compact Staged high energy Accelerator

14

• Develop a reliable electron source• Optimize electron production from a gas cell with variable length,

filled with hydrogen gas and electron dopant

Principle of Ionization injection: Ionization and trapping of e- by tunneling photo-ionization of high Z atom (eg nitrogen) at the peak of laser intensity

Pak et al. Phys. Rev. Lett. 104, 025003 (2010)


Promising results obtained with ELISA at UHI100 facility

15

• 1st Stage (ELISA):– Ionization injection scheme– Simulations with WARP PIC code – Experiments in gas cell at UHI100 facility

(CEA Saclay) and LLC facility (Lund)

Electron spectra: Simulation

Experiment

F.G. Desforges et al, Phys. Plasmas 21 120703 (2014)


Beamline designed to test transport of electron beam at UHI100 facility

16

• Simulations with Tracewin and WARP for a reference energy of 50MeV

• Transverse and longitudinal phase-space density at focus

• Design and implementation of beam transport and characterization is underway using expected e-parameters

• Compact design to fit in the vacuum chamber at UHI100

• Triplet of quads and dipole for energy measurement with 0.5% resolution

A. Chancé et al, NIMA 740 158 (2014)


Multi-GeV acceleration of electrons inside a dielectric capillary over the damping length

Second stage is modeled with the reduced PIC code WAKE_EP

17

W0=100µm W0=150µm W0=240µm

Energy (GeV)

a0=1.4; 40 fs (30J, 65J, 165J)

Capillary radius 154µm, electron density 1017cm-3, plasma wavelength 100µm e- injection (10pC, 10fs, 10µm, 50MeV)

B. S. Paradkar et al, Phys.

Plasmas 20 083120 (2013)


Diagnostics development is underway

• Laser: focal spot, energy, spectrum, before / after interaction. • 3 electron energy spectrometers:

– 50-100 MeV range for the injector, – broad energy range , up to 1GeV, for the non linear regime, – up to 10 GeV for the second stage.

• Electron bunch: pointing detectors, pulse duration, charge.• X-ray diagnostics (betatron) to characterize electron acceleration

18

G. Genoud et al, App Phys B 105, 309 (2011) J. Ju et al Phys Rev STAB 17 051302 (2014)


Summary

• A unique opportunity on the Plateau de Saclay for LPA: – Apollon laser will deliver two beams at the 1 to 10 PW level, with

short pulse duration, in a large area of shielded rooms at l’Orme des Merisiers

– LPA and radiation generation studies will be possible in a versatile environnement

• The multistage laser plasma acceleration programme at CILEX addresses the main challenges of laser plasma accelerators

• Apollon facility will operate as an electron acceleration test facility opened to collaborators and users

19


Aknowledgements

20

Laboratoire Charles Fabry


Brigitte Cros, 2nd Eucard-2 meeting, Barcelona, April 2015 Accelerator R&D in the frame of the CILEX...

Documents

Transcript of Brigitte Cros, 2nd Eucard-2 meeting, Barcelona, April 2015 Accelerator R&D in the frame of the CILEX...