1. Overview of the LINAC12 conference
Alexander Gerbershagen and
Jürgen Pfingstner
19th of September 2012

2. 5. Light sources

3. Overview of Light sources
Rings:
1st generation light sources: SR just byproduct
2nd generation light sources: dedicated rings to create SR
3rd generation light sources: strong use of undulators
4th gen. light sources: Everything that exceeds performance of 3rd gen.
LINAC:
FEL (undulator): Emission
SASE-FEL (microbunching):
Emission
Recent and future activities:
Laser-seeded FEL
XFEL oscillators
Energy recovery linacs (ERL)
Use of RF-cavities as undulators

4. Overview of light sources cont. (TU2A01)

5. Applications of synchrotron light
Medical applications: to cut tissue
Military applications: anti aircraft and missile system
Surface processing and machining
Diffraction imaging:
already several Nobel prices
using FELs

6. Status of LCLS and the European Light Source (TU2A03, MO1A02)
European XFEL:
DESY
Will surpass the performance of LCLS: nm light
Successor of FLASH
SASE-FEL
Also X-FELO in discussion
Currently under construction
Three undulator systems
Start of commissioning summer 2015
LCLS:
SLAC
Most powerful FEL currently
Hard X-rays: nm
Upgrade of LCLS to LCLS-II
2 new beams to increase the number of users served
also improved performance (1fs pulse length, wider X-ray range)
Planed start of operation 2019

7. X-ray FEL Oscillator (XFELO, TU2A02)
XFELO can be build shorter than SASE-FELs
The temporal coherence is much better
e-beam charge can be lower and bunch length longer, CW
Average Brightness very high
Not realised yet
R&D issues are components as mirrors that can work in the X-ray regime

8. Linac-based laser Compton scattering X-ray and gamma-ray sources (WE1A05)
Use the scattering of laser photons with and electron beam from an linac to create X-ray photons
Not as short wavelengths as modern FELs, but much more compact and portable.
With the changing of the properties of the electron beam and the laser, the properties of the scattered photons can be changed, e.g. polarization.

9. ERL-based light source challenges (WE1A01)
Discussion about future challenges
Some designs shown
Can also be combined with X-FELO
Principle can also be used for Lepton-Hadron colliders (eRHIC and LHeC)

10. High-field short-period microwave undulators (WE2A03)
The wavelength of an FEL with undulator is given by:
With permanent magnet cannot be reduced very much anymore.
Use instead of alternating magnetic field an RF cavity
RF undulator requires very high EM fields which causes many problems for the design of the cavity
A cavity design was shown

11. 6. Proton and Ion accelerators

12. Overview of Activities (MO1A01, TU1A02, FR1A03, …)
High intensity proton and ion beams: intensity frontier research
Project X (Fermilab)
MW proton beam that will be used for different exper.
Neutrino physics, physics of rare processes , nuclear studies
SAREF (Soreq, Israel)
Adjoined to Soreq Nuclear Research Center (SNRC)
Fast neutron source
Enrich uranium and transmutation of long- lived radioactive waste
Radioactive ion beams: nuclear research, comparable to ISOLDE
Californium Rare Ion Breeder Upgrade (CARIBU) at ANL ATLAS facility

13. 7. Other new developments

14. Injection schemes for plasma wakefield acceleration (MO2A01)
Scheme a: Self injection
Works in Bubble regime
Black: electron evacuation
Yellow: electron accumulation
Some of the electrons get trapped and accelerated
Scheme b: Colliding laser pulses
Less non-linear wake than Bubble regime
An injection laser pulse collides with the drive pulse and creates beatwave.
Electrons are pre-accelerated and some are trapped and accelerated
Properties of electron beam can be varied by laser beams

15. Advances in Photonic and Metamaterial RF-structures (TU3A02)
Photonic band gap structures support only very narrow frequency band
HOM are strongly reduced
Acceleration gradients up to 100 MV/m, Q > 109
In research
Metamaterial RF-structure
Periodic structure with conductors worked in
Creates ε < 0 and μ < 0
Different EM properties than in nature
Planed to be used for wakefield reduction in structures and for couplers

16. Acceleration/Deceleration of slow neutrons (MO3A04)
Measurement of neutron electric dipole moment (nEDM) could reveal physics beyond the standard model
High intensity neutron beams needed
Problem: Energy spread of ultra cold neutrons (UCN) expands beam
Re-bunching was demonstrated, where fast neutrons were decelerated and slow ones accelerated
Energy of neutrons is changed by flipping magnetic dipole spin with RF wave in static magnetic field.

17. Electron beam current-profile shaping via transverse-to-longitudinal phase-space exchange (TU3A04)
Using double dog leg to exchange transversal and long. phase space
By shaping transverse profile with filter, many different long profiles can be created.
Applications: bunching for FELs and triangular shape for wakefield acceleration.

18. Thanks for the attention!