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Liu LinBrazilian Synchrotron Light Laboratory - LNLS
Towards Diffraction Limited Storage Ring Based Light Sources
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Liu LinBrazilian Synchrotron Light Laboratory - LNLS
Towards Diffraction Limited Storage Ring Based Light Sources
Highlights from Sirius, the Brazilian Light Source Project
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Outline
• The new generation of Storage Ring Light Sources
• High brightness and coherence– Low emittance
– Phase-space matching
• Sirius, the Brazilian Light Source Project– Lattice design highlights: low beta sections
– Light source & beamline integration: improved solution for
CARNAÚBA beamline
• Conclusion
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The new generation of storage rings
Adapted from R. Bartollini
emittance scaling
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The new generation of storage rings
Adapted from R. Bartollini
emittance scaling
3rd Generation
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The new generation of storage rings
Adapted from R. Bartollini
emittance scaling
3rd Generation
4th Generation - MBA
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Some new storage rings and upgrade plans
Machine Energy [GeV] Circum. [m] NB Emit. [pm] statusMAX-IV 3 528 140 330 operation, new
Sirius 3 518 100 250 construction, new
ESRF-U 6 844 224 135 construction, upgrade
ALS-U 2 196 108 109 planned, upgrade
APS-U 6 1104 280 42 planned, upgrade
CLS-II 3 510 147 186 planned, new
Diamond-II 3 561 144 140 planned, upgrade
Elettra-II 2 259 72 250 planned, upgrade
HEPS 6 1296 336 59 planned, new
ILSF 3 528 100 275 planned, new
PEP-X 4.5 2199 12 planned, upgrade
PETRA-IV 6 2304 504 12 planned, upgrade
SLS-II 2.4 290 84 103 planned, upgrade
Soleil-II 2.75 354 104 230 planned, upgrade
Spring8-II 6 1436 200 157 planned, upgrade
Planned machines are at different planning stages.
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Storage ring spectral brilliance (brightness)
1st Generationparasitic operation in colliders, bending magnets
2nd Generationdedicated sources from bending magnets, high flux
3rd GenerationDBA, TBA lattices with straight sections for wigglers and undulators, high brilliance
FLUX
BRILL
IANC
E
COHE
RENT
FLUX
4th Generationemittance reduction with MBA lattices,high performance IDs, high coherent flux
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase space
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase spacePhoton flux [photons/s/0.1% bw]
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase spacePhoton flux [photons/s/0.1% bw]
electron beam emittance
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase spacePhoton flux [photons/s/0.1% bw]
electron beam emittance
photon limiting emittance
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase spacePhoton flux [photons/s/0.1% bw]
electron beam emittance
photon limiting emittance
for Gaussian beam
for undulatorbeam
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase space
• Coherent fraction for undulator radiation
Photon flux [photons/s/0.1% bw]
electron beam emittance
photon limiting emittance
for Gaussian beam
for undulatorbeam
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase space
• Coherent fraction for undulator radiation
• Diffraction limited storage ring
Photon flux [photons/s/0.1% bw]
electron beam emittance
photon limiting emittance
for Gaussian beam
for undulatorbeam
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Spectral brilliance and coherent fraction
• Spectral brilliance: Flux density in phase space
• Coherent fraction for undulator radiation
• Diffraction limited storage ring
Photon flux [photons/s/0.1% bw]
electron beam emittance
photon limiting emittance
for Gaussian beam
for undulatorbeam
εx,y ≈ 100 pm.raddiffraction limit for 2 keV
εx,y ≈ 20 pm.raddiffraction limit for 10 keV
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Achieving low emittance with MBA
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Achieving low emittance with MBA
damping partition
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Achieving low emittance with MBA
curvature functiondamping partition
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dispersion’s betatron amplitude
Achieving low emittance with MBA
curvature functiondamping partition
η: dispersion functionβ, α: Twiss functions
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dispersion’s betatron amplitude
Achieving low emittance with MBA
curvature functiondamping partition
Emittance depends on optics at places where radiation is emitted (dipoles).
η: dispersion functionβ, α: Twiss functions
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dispersion’s betatron amplitude
Achieving low emittance with MBA
curvature functiondamping partition
Emittance depends on optics at places where radiation is emitted (dipoles).
η: dispersion functionβ, α: Twiss functions
Double bend achromat - DBA
......
Multiple bend achromat – MBAmany small dipoles to keep
horizontal focus in each dipole
…
dipolequadrupole
dispersion function
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MBA
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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MBAMany short
cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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MBASmall beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stabilityMBA
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability
• Stable magnets, girdersand floor
• Stable power supplies
MBASmall beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability • Tight orbit correction
with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
MBASmall beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability • Tight orbit correction
with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBASmall beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability
High magnetic
field gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBASmall beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability
High magnetic
field gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability
High magnetic
field gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability
High magnetic
field gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
Courtesy: Ricardo Rodrigues
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High orbit stability
High magnetic
field gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
Strong non-linear beam
dynamics
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetimeHigh
magnetic field
gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
Strong non-linear beam
dynamics
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetimeHigh
magnetic field
gradients
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupoles
Strong non-linear beam
dynamics
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetimeHigh
magnetic field
gradients
• Novel injection schemes, on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupoles
Strong non-linear beam
dynamics
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetimeHigh
magnetic field
gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupoles
Strong non-linear beam
dynamics
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetime
Small aperture vacuum
chambers
High magnetic
field gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupoles
Strong non-linear beam
dynamics
Combined function magnets
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetime
Small aperture vacuum
chambers
High magnetic
field gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupolesHigh vacuum impedance
Strong non-linear beam
dynamics
Combined function magnets
High coupling impedance
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetime
Small aperture vacuum
chambers
High magnetic
field gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
• Special pumping, NEG coating
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupolesHigh vacuum impedance
Strong non-linear beam
dynamics
Combined function magnets
High coupling impedance
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetime
Small aperture vacuum
chambers
High magnetic
field gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
• Special pumping, NEG coating
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupolesHigh vacuum impedance
Strong non-linear beam
dynamics
Combined function magnets
High coupling impedance
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetime
Small aperture vacuum
chambers
High magnetic
field gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
• Special pumping, NEG coating
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupolesHigh vacuum impedance
Strong non-linear beam
dynamics
Combined function magnets
High coupling impedance
Courtesy: Ricardo Rodrigues
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High orbit stability
Small clearance for injection
Low lifetime
Small aperture vacuum
chambers
High magnetic
field gradients
Compact magnets • Novel injection schemes,
on-axis injection, ultra-fast kickers
• Tight orbit correction with fast feedback, feedforward
• Stable magnets, girdersand floor
• Stable power supplies
• Minimize beam instabilities, optimize components impedance
• Special pumping, NEG coating
MBA
Very sensitive to errors
Small beamemittance
Many short cells
The Multi Bend Achromat Challenges
• Non-linear dynamics optimization tools
• New elements, octupolesHigh vacuum impedance
Strong non-linear beam
dynamics
Combined function magnets
High coupling impedance
Recent advances in accelerator technology, simulation tools, new design ideas, etc, are helping to overcome the challenges but many issues are still open and require R&D.
Courtesy: Ricardo Rodrigues
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Other ingredients to reduce emittance
• Increase damping partition number Jx by adding transverse field gradient in dipoles.
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Other ingredients to reduce emittance
• Increase damping partition number Jx by adding transverse field gradient in dipoles.
• Longitudinal dipole gradient
– Curvature function– To keep product small: compensate variation in with variation in– Radiate more (high curvature) where is small.
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Other ingredients to reduce emittance
• Increase damping partition number Jx by adding transverse field gradient in dipoles.
• Longitudinal dipole gradient
– Curvature function– To keep product small: compensate variation in with variation in– Radiate more (high curvature) where is small.
• Achromatic cells and low field dipoles to enhance emittance reduction with Insertion Devices.
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Other ingredients to reduce emittance
• Increase damping partition number Jx by adding transverse field gradient in dipoles.
• Longitudinal dipole gradient
– Curvature function– To keep product small: compensate variation in with variation in– Radiate more (high curvature) where is small.
• Achromatic cells and low field dipoles to enhance emittance reduction with Insertion Devices.
• Different dipole lengths, shorter dipoles at cell ends, where η = η’ = 0 .
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Other ingredients to reduce emittance
• Increase damping partition number Jx by adding transverse field gradient in dipoles.
• Longitudinal dipole gradient
– Curvature function– To keep product small: compensate variation in with variation in– Radiate more (high curvature) where is small.
• Achromatic cells and low field dipoles to enhance emittance reduction with Insertion Devices.
• Different dipole lengths, shorter dipoles at cell ends, where η = η’ = 0 .• Increase damping with Damping Wigglers → energy spread increases.
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Other ingredients to reduce emittance
• Increase damping partition number Jx by adding transverse field gradient in dipoles.
• Longitudinal dipole gradient
– Curvature function– To keep product small: compensate variation in with variation in– Radiate more (high curvature) where is small.
• Achromatic cells and low field dipoles to enhance emittance reduction with Insertion Devices.
• Different dipole lengths, shorter dipoles at cell ends, where η = η’ = 0 .• Increase damping with Damping Wigglers → energy spread increases.• Anti-bends (SLS). Disentangle dispersion η and beta function βx.
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Diffraction Limit: low emittance is not all! Phase space matching
matchedmismatched
actual radiation emittance
electron beam
emittance
photon limiting
emittance
Electron beam and radiation phase-space
Matching condition
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Diffraction Limit: low emittance is not all! Phase space matching
Highest brilliance from undulator of length L is achieved when
Ryan R. Lindberg and Kwang-Je Kim (2015)
matchedmismatched
actual radiation emittance
electron beam
emittance
photon limiting
emittance
Electron beam and radiation phase-space
Matching condition
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Diffraction Limit: low emittance is not all! Phase space matching
Highest brilliance from undulator of length L is achieved when
Ryan R. Lindberg and Kwang-Je Kim (2015)
matchedmismatched
actual radiation emittance
electron beam
emittance
photon limiting
emittance
Electron beam and radiation phase-space
Matching condition
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SINGLE PHOTON’S ”PHASE SPACE” (900 eV)(Wigner Distribution Function)
from single electron
Phase space matching (from SPECTRA)
0
1 ×1021
2 ×1021
3 ×1021
Courtesy: Harry Westfahl Jr.
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=
=
SINGLE PHOTON’S ”PHASE SPACE” (900 eV)(Wigner Distribution Function)
from single electron
ELECTRONS PHASE SPACE (HORIZONTAL)
AVERAGE PHOTON’S ”PHASE SPACE”(Wigner Distribution Function=Brilliance)
βx = 1.5 m
βx = 9 m
WDF(0,0) = 1021
ph/s
/mm
2 /m
rad2 /
0.1%
bw
WDF(0,0) = 5 1020
Phase space matching (from SPECTRA)
x [μm]
x’ [μ
rad]
x [μm]
x’ [μ
rad]
0
1 ×1021
2 ×1021
3 ×1021
0
2 ×1020
4 ×1020
6 ×1020
8 ×1020
Courtesy: Harry Westfahl Jr.
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Sirius, the Brazilian Light Source Project
Budget• Accelerators 100 M US$• 13 beamlines 140 M US$• Building 213 M US$• Human Res 57 M US$• Total
510 M US$
Schedule• Jan.2015 start of building construction• Oct.2017 start of machine installation• Jul.2018 start of SR commissioning• Sep.2018 phase 1 operation (20mA, NCC)• Feb.2019 phase 2 operaton (100mA, SCC)
First beam 2018 – Open in 2019
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40.000 students
UVX• 1.37 GeV• 100 nm.rad• 18 beamlines• 0ver 1200 users/yr
City of Campinas (population: 1.100.000)
200 employees80 students &
0 trainees
CNPEM Campus
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Sirius main parameters
Storage Ring
Beam energy 3.0 GeV
Circumference 518.4 m
Lattice 20 x 5BA
Hor. emittance (bare lat.) 0.25 nm.rad
Hor. emittance (with IDs) → 0.15 nm.rad
Betatron tunes (H/V) 49.11 / 14.17
Natural chrom. (H/V) -119.0 / -81.2
rms energy spread 0.85 x 10-3
Energy loss/turn (dipoles) 473 keV
Dam. times (H/V/L) [ms] 16.9 / 22.0 / 12.9
Nominal current, top up 350 mALINACE = 150 MeV
BOOSTERE = 3 GeVEmit = 3.5 nm.rad
STORAGE RINGE = 3 GeV
Emit = 0.25 nm.rad
BoosterCircumference 496.8 m
Emittance @ 3 GeV 3.5 nm.rad
Lattice 50 Bend
Cycling frequency 2 Hz
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The Sirius 5BA magnet lattice
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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The Sirius 5BA magnet lattice
• 20 - 5BA arcs and 2 types of straight sections for insertion devices:– 5 high βx straight sections of 7.0 m – matching with quad doublets.– 15 low βx straight sections of 6.0 m – matching with quad triplets.
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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The Sirius 5BA magnet lattice
• 20 - 5BA arcs and 2 types of straight sections for insertion devices:– 5 high βx straight sections of 7.0 m – matching with quad doublets.– 15 low βx straight sections of 6.0 m – matching with quad triplets.
• 20 PM longitudinal gradient superbends – sharp peak field of Bp= 3.2 T in the center → cri cal photon energy of ec = 19.2 keV
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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The Sirius 5BA magnet lattice
• 20 - 5BA arcs and 2 types of straight sections for insertion devices:– 5 high βx straight sections of 7.0 m – matching with quad doublets.– 15 low βx straight sections of 6.0 m – matching with quad triplets.
• 20 PM longitudinal gradient superbends – sharp peak field of Bp= 3.2 T in the center → cri cal photon energy of ec = 19.2 keV
• Low field (0.58 T) EM and PM dipoles with transverse field gradient (7.8 T/m)
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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The Sirius 5BA magnet lattice
• 20 - 5BA arcs and 2 types of straight sections for insertion devices:– 5 high βx straight sections of 7.0 m – matching with quad doublets.– 15 low βx straight sections of 6.0 m – matching with quad triplets.
• 20 PM longitudinal gradient superbends – sharp peak field of Bp= 3.2 T in the center → cri cal photon energy of ec = 19.2 keV
• Low field (0.58 T) EM and PM dipoles with transverse field gradient (7.8 T/m)• 13 quadrupoles/cell, 14 sextupoles/cell, no octupoles
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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The Sirius 5BA magnet lattice
• 20 - 5BA arcs and 2 types of straight sections for insertion devices:– 5 high βx straight sections of 7.0 m – matching with quad doublets.– 15 low βx straight sections of 6.0 m – matching with quad triplets.
• 20 PM longitudinal gradient superbends – sharp peak field of Bp= 3.2 T in the center → cri cal photon energy of ec = 19.2 keV
• Low field (0.58 T) EM and PM dipoles with transverse field gradient (7.8 T/m)• 13 quadrupoles/cell, 14 sextupoles/cell, no octupoles • Different lengths for B1 and B2 (but same unit block)
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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The Sirius 5BA magnet lattice
• 20 - 5BA arcs and 2 types of straight sections for insertion devices:– 5 high βx straight sections of 7.0 m – matching with quad doublets.– 15 low βx straight sections of 6.0 m – matching with quad triplets.
• 20 PM longitudinal gradient superbends – sharp peak field of Bp= 3.2 T in the center → cri cal photon energy of ec = 19.2 keV
• Low field (0.58 T) EM and PM dipoles with transverse field gradient (7.8 T/m)• 13 quadrupoles/cell, 14 sextupoles/cell, no octupoles • Different lengths for B1 and B2 (but same unit block)• NEG coated copper beam pipe ∅ = 24 mm (internal)
B1 B1B2 B2BC
Quadrupoledoublet
dipoleB=0.58 Tsuperbend
B=3.2 T, θ=1.4°
Quadrupoletriplet
dipoleB=0.58 T
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Superbends (no wigglers allowed)
Permanent magnet (NdFeB)High field insert (3.2 T) superbend- 19 keV critical energy at peak- Hard X-rays produced only at beamline exit- Total energy loss/turn from dipoles = 473 keV
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Superbends (no wigglers allowed)H
orizontalDivergence
020
4060
80100
1200 5 10 15 20 25
E[keV]
Δψ[mrad]
From SRW:
Permanent magnet (NdFeB)High field insert (3.2 T) superbend- 19 keV critical energy at peak- Hard X-rays produced only at beamline exit- Total energy loss/turn from dipoles = 473 keV
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Sirius optics
• 5-fold symmetric optics with 5 high and 15 low β sections.
• Achromatic cells.• At low β sections
– βx ≈ βy ≈ 1.5 m– Optimized electron and
photon beam phase-space matching for undulators.
• At superbend– Strong focusing of
dispersion and βx functions– Beam size: 9.6 x 3.6 µm2
By
2.76˚ 2.76˚4.10˚ 4.10˚1.41˚ 1.41˚
1.47˚
high βlow β
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Sirius optics
• 5-fold symmetric optics with 5 high and 15 low β sections.
• Achromatic cells.• At low β sections
– βx ≈ βy ≈ 1.5 m– Optimized electron and
photon beam phase-space matching for undulators.
• At superbend– Strong focusing of
dispersion and βx functions– Beam size: 9.6 x 3.6 µm2
By
2.76˚ 2.76˚4.10˚ 4.10˚1.41˚ 1.41˚
1.47˚
high βlow β
βx ≈ βy ≈ 1.5 m
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Sirius optics
• 5-fold symmetric optics with 5 high and 15 low β sections.
• Achromatic cells.• At low β sections
– βx ≈ βy ≈ 1.5 m– Optimized electron and
photon beam phase-space matching for undulators.
• At superbend– Strong focusing of
dispersion and βx functions– Beam size: 9.6 x 3.6 µm2
By
2.76˚ 2.76˚4.10˚ 4.10˚1.41˚ 1.41˚
1.47˚
high βlow β
Low β SSσ [μm2] = 18 X 2.0σ’ [μrad2]= 13 X 1.2
βx ≈ βy ≈ 1.5 m
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Sirius optics
• 5-fold symmetric optics with 5 high and 15 low β sections.
• Achromatic cells.• At low β sections
– βx ≈ βy ≈ 1.5 m– Optimized electron and
photon beam phase-space matching for undulators.
• At superbend– Strong focusing of
dispersion and βx functions– Beam size: 9.6 x 3.6 µm2
By
2.76˚ 2.76˚4.10˚ 4.10˚1.41˚ 1.41˚
1.47˚
high βlow β
Low β SSσ [μm2] = 18 X 2.0σ’ [μrad2]= 13 X 1.2
superbendσ [μm2] = 9.6 X 3.6σ’ [μrad2]= 26 X 0.7εc [keV] = 19.2
βx ≈ βy ≈ 1.5 m
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Sirius optics
• 5-fold symmetric optics with 5 high and 15 low β sections.
• Achromatic cells.• At low β sections
– βx ≈ βy ≈ 1.5 m– Optimized electron and
photon beam phase-space matching for undulators.
• At superbend– Strong focusing of
dispersion and βx functions– Beam size: 9.6 x 3.6 µm2
By
2.76˚ 2.76˚4.10˚ 4.10˚1.41˚ 1.41˚
1.47˚
high βlow β
Low β SSσ [μm2] = 18 X 2.0σ’ [μrad2]= 13 X 1.2
High β SSσ [μm2] = 66 X 3.0σ’ [μrad2]= 3.7 X 0.8
superbendσ [μm2] = 9.6 X 3.6σ’ [μrad2]= 26 X 0.7εc [keV] = 19.2
βx ≈ βy ≈ 1.5 m
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New low βx operation mode
Symmetry=10
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New low βx operation mode
high β high β high βlow β low β
Symmetry=10
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New low βx operation mode
high β high β high βlow β low β
Symmetry=10
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New low βx operation mode
Symmetry 5: 5 high βx + 15 low βx
high β high β high βlow β low β
high β high βlow β low βlow β
Symmetry=10
Symmetry=5
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Low β optics: phase-space matching
Numerical integration of Wigner Distribution FunctionGaussian approximation of reference [H. Westfahl Jr et al, JSR, 24, 2017]
ε = 250 pm.rad
Courtesy: Harry Westfahl Jr
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Low β optics: phase-space matching
Numerical integration of Wigner Distribution FunctionGaussian approximation of reference [H. Westfahl Jr et al, JSR, 24, 2017]
ε = 250 pm.rad
Sirius
Courtesy: Harry Westfahl Jr
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Low β optics: phase-space matching
Numerical integration of Wigner Distribution FunctionGaussian approximation of reference [H. Westfahl Jr et al, JSR, 24, 2017]
ε = 250 pm.rad
Sirius MAX-IV
Courtesy: Harry Westfahl Jr
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Low β optics: Beam Stay-Clear
high β low β
vertical
horizontal
low β
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Low β optics: Beam Stay-Clear
high β low β
vertical
horizontal
low β
< 2.4 mm @ 1.2m from center
< 4.2 mm @ 1.2m from center
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Low β optics: Beam Stay-Clear
< 11.5 mm @ 1.2m from center
< 3.0 mm @ 1.2m from center
high β low β
vertical
horizontal
low β
< 2.4 mm @ 1.2m from center
< 4.2 mm @ 1.2m from center
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Low β optics: Beam Stay-Clear
Sirius IDs will be based on Delta and APU undulators.
< 11.5 mm @ 1.2m from center
< 3.0 mm @ 1.2m from center
high β low β
vertical
horizontal
low β
< 2.4 mm @ 1.2m from center
< 4.2 mm @ 1.2m from center
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Low β optics: Insertion Devices
• Delta Undulators– Possible for Sirius due to small Hor. BSC– Smoother K changes – Horizontal, Vertical and Circular x-ray
polarizations on the same energy range– Do not introduce strong harmful multipoles
Delta undulator prototypeEffect of 14 Delta21 and 14 Delta52 on DA7 in each polarization (H/V) distributed in low beta sections
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Effect of IDs on emittance and energy spread
Beamline ID Type SS βx
CARNAÚBA Delta21 06 low
EMA APU19 08 low
CATERETÊ Delta21 07 low
IPÊ Delta52 11 low
SABIÁ Delta52 10 low
MANACÁ APU20 09 high
PGM++ Delta52 12 low
Sirius Phase-1 Beamlines
ID Type B0 [T] λ [mm] L [m] Kmax gap [mm]
Delta21 1.12 21 2.4 2.2 6.92Delta52 1.19 52 3.6 5.85 13.85APU19 1.28 19 2.4 2.3 5.0APU20 1.07 20 2.4 2.0 6.2
Sirius IDs
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Sirius: initial phase beamlines (2019-2020)
3 GeV, 250 pm rad
IPÊ(AP-RIXS/AP-XPS)90 eV - 1600 eV
PAINEIRA(XPD)
4 -45 keV
CARNAÚBA(nanoprobe/ptychography)
2 -15 keV
MOGNO(Cone beam CT)
30- 120keV
JATOBÁ (XTMS)
30-120 keV
Short period undulat orLong per iod undulat or
3 .2 T Superbend
SABIÁ(ARPES/XMCD)
90 eV - 1600 eV
MANACÁ(micro and nano MX)
5 - 20 keVCATERETÊ(pw-CDI/XPCS)
3- 15 keV
INGÁ(IXS/Raman)5 - 24 keV
IMBÚIA(IR-SNOM)
0.001 - 1 eV
SAPUCAIA(SAXS)
4-24 keV
QUATI(quick EXAFS)
4- 45 keV
3 - 35 keV
EMA(Extreme Conditions)
– Experimental Programs• Tender nano-probe for spectro-
ptychography• Large FOV (30 μm) Coherent Diffraction
Imaging• Bragg CDI/XRD/XAFS under extreme
conditions• Serial micro and nano MX• Tender x-ray RIXS• AP-RIXS/XPS• ARPES/PEEM• Cone beam High Energy Tomography• Quick-EXAFS• 3D X-Ray Diffraction Microscopy• High-Throughput SAXS• Time Resolved Powder Diffraction• nano-FTIR
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3.2 T BC 1.1 T 3PW
Brilliance Comparison
• Even with future upgrades, Sirius will be competitive in the energy range of tender X-rays.
ESRF-USirius
MAX IV
ALS-U
Sirius
ESRF-U
ALS-U
MAX IV
PS Cl K Ca Ti Cr
Courtesy: Harry Westfahl
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3.2 T BC 1.1 T 3PW
Brilliance Comparison
• Even with future upgrades, Sirius will be competitive in the energy range of tender X-rays.
ESRF-USirius
MAX IV
ALS-U
Sirius
ESRF-U
ALS-U
MAX IV
PS Cl K Ca Ti Cr
Courtesy: Harry Westfahl
factor ~2 comes from betatronfunction matching
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Scanning X-ray microscope
PhotonFlux ~ Brilliance(NA × δ )2
20 μm (@ LNLS today) 20 nm (@ Sirius in 2019)
2NA
δ
Focusing optics
@ LNLS today: micronutrients during brain Formation 1 mm cerebral organoidsRafaela C. Sartore et al. (2017)
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Combining coherent lensless X-ray imaging and fluorescence
green algae Chlamydomonas reinhardtiimodel cell for studying photosynthesis
Junjing Deng et al (2017) done at APS
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Combining coherent lensless X-ray imaging and fluorescence
100 nm pix
green algae Chlamydomonas reinhardtiimodel cell for studying photosynthesis
Junjing Deng et al (2017) done at APS
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Combining coherent lensless X-ray imaging and fluorescence
100 nm pix 18 nm pix
green algae Chlamydomonas reinhardtiimodel cell for studying photosynthesis
Junjing Deng et al (2017) done at APS
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Combining coherent lensless X-ray imaging and fluorescence
100 nm pix 18 nm pix
Overlay of the two measurements green algae Chlamydomonas reinhardtiimodel cell for studying photosynthesis
Junjing Deng et al (2017) done at APS
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Combining coherent lensless X-ray imaging and fluorescence
100 nm pix 18 nm pix
Overlay of the two measurements green algae Chlamydomonas reinhardtiimodel cell for studying photosynthesis
Junjing Deng et al (2017) done at APS
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CARNAÚBA(Coherent X-Ray Nanofocus Beamline)
Fluorescence: ~100 nm pix
Acquisition time (2D):~0.1 s/pixel & ~75 min/image ~104 photons/nm2 at 5.2 keV
Lenseless imaging: ~18 nm pix
@ APS today:
Junjing Deng et al (2017)
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CARNAÚBA(Coherent X-Ray Nanofocus Beamline)
(analytical ray tracing)
(analytical ray tracing)
Horizontal (Hybrid method, Shi et al. 2014)Vertical (Hybrid method, Shi et al. 2014)
Fluorescence: ~100 nm pix
Acquisition time (2D):~0.1 s/pixel & ~75 min/image ~104 photons/nm2 at 5.2 keV
Lenseless imaging: ~18 nm pix
50 nm pix
@ APS today:
Sirius
Junjing Deng et al (2017)
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CARNAÚBA(Coherent X-Ray Nanofocus Beamline)
(analytical ray tracing)
(analytical ray tracing)
Horizontal (Hybrid method, Shi et al. 2014)Vertical (Hybrid method, Shi et al. 2014)
PS Cl K Ca Ti Cr
×
×
×
×
×
×
×
[ ]
[/
]
Fluorescence: ~100 nm pix
Acquisition time (2D):~0.1 s/pixel & ~75 min/image ~104 photons/nm2 at 5.2 keV
Lenseless imaging: ~18 nm pix
50 nm pix
@ APS today:
Sirius
~10 μs/pixel & ~1s/image
Sirius
Junjing Deng et al (2017)
~108 photons/nm2 at 5.2 keV
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Machine & Beamline teams integration:Source scanning for ptychography
M. D. de Jonge et al. J. Sync. Rad. (2014)• Scanning the source position with
corrector strengths of ±400μrad can result in scanning ranges of ±400μm in each direction.
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Machine & Beamline teams integration:Source scanning for ptychography
σx
σy
5 10 15 200
5
10
15
20
25
Photon Energy [keV]
rms
size
[μm
]
M. D. de Jonge et al. J. Sync. Rad. (2014)• Scanning the source position with
corrector strengths of ±400μrad can result in scanning ranges of ±400μm in each direction.
• Step sizes of σx and σy result in ~ 40 x 100 overlapping scanning points for ptychography.
![Page 100: Towards Diffraction Limited Storage Ring Based Light Sources](https://reader036.vdocuments.us/reader036/viewer/2022081622/613c646ef237e1331c51472e/html5/thumbnails/100.jpg)
Machine & Beamline teams integration:Source scanning for ptychography
σx
σy
5 10 15 200
5
10
15
20
25
Photon Energy [keV]
rms
size
[μm
]
M. D. de Jonge et al. J. Sync. Rad. (2014)• Scanning the source position with
corrector strengths of ±400μrad can result in scanning ranges of ±400μm in each direction.
• Step sizes of σx and σy result in ~ 40 x 100 overlapping scanning points for ptychography.
• Local beam bumps can be created with 4 correctors in the low beta straight section.
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Conclusions
• The Synchrotron Radiation Light Source community is goingthrough a very exciting time, with many new developmentsunder way both in the machine and scientific applicationsides. Many new machines and machine upgrades areexpected for next years.
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Conclusions
• The Synchrotron Radiation Light Source community is goingthrough a very exciting time, with many new developmentsunder way both in the machine and scientific applicationsides. Many new machines and machine upgrades areexpected for next years.
If you are a student or a young person starting in this field:you’ll have lots of fun! 😃
![Page 103: Towards Diffraction Limited Storage Ring Based Light Sources](https://reader036.vdocuments.us/reader036/viewer/2022081622/613c646ef237e1331c51472e/html5/thumbnails/103.jpg)
Conclusions
• The Synchrotron Radiation Light Source community is goingthrough a very exciting time, with many new developmentsunder way both in the machine and scientific applicationsides. Many new machines and machine upgrades areexpected for next years.
If you are a student or a young person starting in this field:you’ll have lots of fun! 😃
• It is important to integrate machine and beamline teams inthe optimization of experiments.
![Page 104: Towards Diffraction Limited Storage Ring Based Light Sources](https://reader036.vdocuments.us/reader036/viewer/2022081622/613c646ef237e1331c51472e/html5/thumbnails/104.jpg)
Conclusions
• The Synchrotron Radiation Light Source community is goingthrough a very exciting time, with many new developmentsunder way both in the machine and scientific applicationsides. Many new machines and machine upgrades areexpected for next years.
If you are a student or a young person starting in this field:you’ll have lots of fun! 😃
• It is important to integrate machine and beamline teams inthe optimization of experiments.
• This is an open community and international cooperation isone of the most important sources for learning andadvancing in this area.
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Thank you!
Sirius Team – a small but highly motivated and integrated team!