1. Electron beam dynamics
Christelle Bruni
LAL

2. Activities Linear accelerator Rings
Effect of the CSR and the laser shape on the compression (CSRtrack, Astra)
Beam Break Up estimation for ERL(BI)
Photoinjector caracterisation on PHIL (experiment, ASTRA)
Alternative ERL design for THOMX (Astra, beta)
Rings
Longitudinal dynamics (2D tracking home code)
Super-ACO (includinf FEL effect), ATF, ThomX (including CBS recoil effect)
FELs (models, feedback, non linear dynamics)
50 MeV ring optics design on ThomX (beta code)
Vaccum effects : multiple scattering, ion instabilities
Intrabeam scattering (Mtingwa model)
X-ray brilliance and flux evaluation (CAIN)

3. ARC-EN-CIEL accelerator design

4. Emittance degradation in the chicane

5. Longitudinal phase space degradation
Space charge force non linearities
Non uniformity induced by the CSR

6. Ellipsoid shape of the laser
can

7. Improvement of the longitudinal phase space
Compression
To improve the longitudinal phase space
Harmonic cavity
Lenghen the laser as possible
To improve emittance
Laser pulse shape
Optical function

8. PHIL : photoinjector beam test line

9. PHIL with AlphaX gun

10. Laser on the virtual cathode
Charge measurement
Laser on the virtual cathode

11. Charge simulation
Including
Aperture of the beam line
Schottcky effect

12. Transverse size characterization
Experiment for different gradient
Simulations including the non linearity of the solenoid field

13. Project on short bunches
fs laser
Ultimate electron
beam performances
100 pC, 150 fs
THz modulation
To obtain fs bunch train
ps modulated laser based on a Michelson interferometer as in the experiment on the Japanese synchrotron UVSOR (S. Bielawski and C. Szwaj from Lille) : “chirped pulse beating”
Funding request to the ANR french agency

14. Difficulties due to short bunches
Preserve duration during transport
Avoid bunch lengthening due to different path length during focusing
Take care of the transverse pointing stability for capillary injection (tolerance less than 10 µm)
Evaluation of the emittance degradation due to multiple scattering in gas before the capillary ?
If shortest bunches needed,
is the magnetic chicane envisaged to be added at highest energy ?
Laser fs at the photocathode ?
Laser shaping existing ? If not required ?