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Overview of the LINAC12 conference. Alexander Gerbershagen and Jürgen Pfingstner 19 th of September 2012. 5. Light sources. Overview of Light sources . Rings: 1 st generation light sources: SR just byproduct 2 nd generation light sources: dedicated rings to create SR - PowerPoint PPT Presentation
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
Overview of the LINAC12 conference
Alexander Gerbershagen andJürgen Pfingstner
19th of September 2012
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
5. Light sources
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
Overview of light sources cont. (TU2A01)
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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.
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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)
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
6. Proton and Ion accelerators
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
7. Other new developments
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
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.
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
• 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)
Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
Thanks for the attention!