overview of the linac12 conference
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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 PresentationTRANSCRIPT
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
Overview of the LINAC12 conference
Alexander Gerbershagen andJürgen Pfingstner
19th of September 2012
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
5. Light sources
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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
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
Overview of light sources cont. (TU2A01)
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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
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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
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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
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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.
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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)
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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
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
6. Proton and Ion accelerators
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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
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
7. Other new developments
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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
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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
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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.
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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)
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Alexander Gerbershagen and Jürgen Pfingstner LINAC12 overview
Thanks for the attention!