Overview of the LINAC12 conference

Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview

Overview of the LINAC12 conference

Alexander Gerbershagen andJürgen Pfingstner

19th of September 2012


5. Light sources


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 (FERMI@electra)

• XFEL oscillators

• Energy recovery linacs (ERL)

• Use of RF-cavities as undulators


Overview of light sources cont. (TU2A01)


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


Status of LCLS and the European Light Source (TU2A03, MO1A02)

LCLS:

• SLAC

• Most powerful FEL currently

• Hard X-rays: 0.15-15nm

• 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

European XFEL:

• DESY

• Will surpass the performance of LCLS: 0.05-

6nm light

• Successor of FLASH

• SASE-FEL

• Also X-FELO in discussion

• Currently under construction

• Three undulator systems

• Start of commissioning summer 2015


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


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.


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)


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


6. Proton and Ion accelerators


Overview of Activities (MO1A01, TU1A02, FR1A03, …)

• High intensity proton and ion beams: intensity frontier research

1. Project X (Fermilab)

• MW proton beam that will be used for different exper.

• Neutrino physics, physics of rare processes , nuclear studies

2. 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

1. Californium Rare Ion Breeder Upgrade (CARIBU) at ANL ATLAS facility


7. Other new developments


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


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


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.


• 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.

Electron beam current-profile shaping via transverse-to-longitudinal phase-

space exchange (TU3A04)


Thanks for the attention!

Overview of the LINAC12 conference

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