1. SuperB Synchrotron Radiation Source Issues
John Seeman
SLAC
Annecy SuperB Workshop
March 16-19, 2010
Annecy SuperB Workshop

2. Annecy SuperB Workshop
Tasks
Compare to NSLS-II
NSLS-II ring and beam line examples
Potential HER synchrotron radiation beam lines at Frascati
Potential LER synchrotron radiation beam lines at Frascati
Expected SR power brightness and flux
Tor Vergata possibilities
Annecy SuperB Workshop

3. NSLS-II Technical Requirements & Specifications
Energy GeV
Circumference m
Number of Periods DBA
Length Long Straights & 9.3m
Emittance (h,v) <1nm, 0.008nm
Momentum Compaction
Dipole Bend Radius m
Energy Loss per Turn <2MeV
Energy Spread %
RF Frequency MHz
Harmonic Number
RF Bucket Height >2.5%
RMS Bunch Length ps-30ps
Average Current ma
Current per Bunch ma
Charge per Bunch nC
Touschek Lifetime >3hrs
Krinsky
Annecy SuperB Workshop

4. NSLS-II Lattice Functions for One Cell
Krinsky
Annecy SuperB Workshop

5. 0.1 meV Development Instrument (10m)
NSLS-II Inelastic X-ray Scattering Beamline Beamline Design, Baseline & Mature Scope
BASELINE SCOPE:
1 meV spectrometer (5 m) with single analyzer
Operates at E ~ 9.1 keV with the new optical scheme or a proven alternative
Total energy resolution ~ 1 meV with improved resolution tail
Scanned energy range: ~ 1 eV
Incident flux at sample > 109 photons/sec/1meV (IVU22-3m)
Q range / resolution: 0.1 ~ 40 nm-1 / ~ 0.1 nm-1
Focus: ~ < 5 µm (V) x 10 µm (H)
High-β straight
2nd Undulator (IVU22-3m)
Undulator (IVU22-3m)
Defining Aperture & Absorber
1D Be Compound Refractive Lens
Shutter
20m
40m
Storage Ring Shield Wall
2nd Vertical Focusing Mirror
Pre-monochromator
Shutter
2nd Horizontal Focusing Mirror
for High Q Resolution
CDDW Monochromator
Cai
Shutter
0.1 meV Development Instrument (10m)
59m
Vertical Focusing Mirror
69m
CC Monochromator
Horizontal Focusing Mirror
For 0.1 meV
Sample
Phase Plate
For Q > 40 nm-1
64m
Multilayer Collimating Mirror
MATURE SCOPE ADDITIONS:
Undulator: 2nd IVU22-3m (Total: IVU22-6m)
Channel-Cut Monochromator for 0.1 meV
Phase Plate for Q > 40 nm-1
2nd Set of Focusing Mirrors for ΔQ ~ 0.01 nm-1
Sample Environments (not shown)
0.1 meV Development Instrument (10 m)
CDDW Analyzer
Detector
1 meV Spectrometer (5m)
Annecy SuperB Workshop

6. NSLS-II Hard X-ray Nanoprobe Beamline Layout
BASELINE Scientific Capabilities
Beamline design capable of ~1nm spatial resolution
Satellite building for environmental isolation and stability
Initial Science Microscope at 10nm to 30nm
Nano-XRF & XRD at 6~25 keV with MLL/FZP
Optimized for final optic aperture up to ~150 mm
Incident flux in final focal spot > 109 ph/s
High source stability using secondary source aperture
white beam slits
storage ring wall
IUV20
low beta
Horizontal
collimating mirror
Horizontal
Si(111) mono
Pink beam slits
1D CRL lenses
(transfocator)
Horizontal
focusing mirror
*Upgrade to
Vertical mirror system
*Secondary source
aperture 1, z=62m
*High resolution
mono
Mature Scope Scientific Capabilities
XRF at sub-10m~1nm using MLL Prototype Microscope.
Addition of temperature control/cryo capability to the Science Microscope.
Enable use of nanofocusing optics w/ large aperture for larger working distance by adding SSA1 at z=62m
Replacement of 1D CRLs w/ mirror system for achromatic beamline optical configuration.
Chu
Remote Satellite
Building
Secondary source aperture 2 at z=94m
MLL/FZP
Multi-element
XRF detector
Annecy SuperB Workshop
z=108m
PAD for
XRD/Ptychography
sample

7. NSLS-II Sketch of the SRX-Beamline
Annecy SuperB Workshop

8. NSLS-II Damping Wiggler (WBS1.03.07.01)
NdFeB-PM with Side Magnets and Permendur Pole (width 80mm),
lu=90mm, Gap=12.5mm, Symmetric magnetic field
Vacuum Chamber Aperture Size 9.5mm (v) x 76mm (h)
Conceptual Design
Symmetic Field with 37 Full Strength Periods 36
Annecy SuperB Workshop

9. APS Proposal for NSLS-II
Similar concept as LSLS undulator
CAD Model
Annecy SuperB Workshop

10. EPU Active Compensation (à la BESSY)
Courtesy of J. Bahrdt
Annecy SuperB Workshop

11. Elliptically Polarizing Undulator (EPU) (WBS1.03.07.03)
Apple -II, lu=49mm, Gap=11.5mm ,2x2m Long (canted -0.08mrad:0.16mrad:-0.08mrad)
Four Motors for Phase to achieve 180 degree rotation of linear polarization plane
Vacuum Chamber Aperture Size 8.0mm (v) x 61mm (h) (tentative)
BPM
Button
Canting
Magnet
Annecy SuperB Workshop

12. Undulator choice for NSLS-II
Low beta, short straight section
To serve both branches independently  two undulators, canted design
Spectral flux at odd harmonics (by O. Choubar)
Annecy SuperB Workshop

13. IVU Magnetic Performances and Acceptable Lengths
IVU Parameters
Geometry:
Pole Width: 40 mm
Pole Height: 25 mm
Pole Thickness: 3 mm (for λu = 20 mm)
Materials:
Pole: Va Permendur NEOMAX
Magnet: NdFeB, Br = 1.12 T
Magnet Width: 50 mm
Magnet Height: 29 mm
Fundamental Photon Energy vs Gap for Different IVU Periods
IVU Lengths ~Satisfying “Stay Clear” Constraint in High-Beta Straight Section
IXS requirement
O.Chubar
βy0 = 3.4 m
Annecy SuperB Workshop

14. Brightness---NSLS-II
Annecy SuperB Workshop

15. Annecy SuperB Workshop
Flux---NSLS-II
SRW calculation by O. Chubar
Annecy SuperB Workshop

16. NSLS-II Insertion Devices (02/10)
Annecy SuperB Workshop

17. Annecy SuperB Workshop
NSLS-II Tolerances
Annecy SuperB Workshop

18. NSLS-II ID Field Error Comparison
1st & 2nd
Integrals
Cf G.cm.cm corresponds to 3 microns in displacement at NSLS-II
Insertion Device
Integrated Multipoles
Unit 
Annecy SuperB Workshop

19. Annecy SuperB Workshop
Frascati Site
Annecy SuperB Workshop

20. 1st Geological Survey Frascati
Linac Tunnel
Modulator Hall
Transfer Lines
Super-B Tunnel
Annecy SuperB Workshop

21. 1st Geological Survey Frascati
Collider Hall
Super-B Tunnel
Annecy SuperB Workshop

22. Annecy SuperB Workshop
Layout & geometry
Biagini
LER SR IP
66 mrad
LER SR
HER and LER arcs are parallel to each other in the H-plane while separated by 2.1 m.
Each ring has one inner and one outer arc.
Both inner and outer arcs provide the same bending angle but outer arc is made longer (increased drift space around the dipoles) in order to provide the same azimuth location as the inner arc
LER
arc
LER
arc
HER
arc
HER
arc
Rings
crossing e- e+ RF
Annecy SuperB Workshop

23. Annecy SuperB Workshop
Arcs
HER and LER arcs have conceptually the same lattice. LER arc dipoles are shorter (bend radius about 3 times smaller) than in the HER in order to match the ring emittances at the asymmetric beam energies.
Biagini
LER
HER
mx = 3p, my = p
Cell in HER
mx = 3p, my = p
Cell in LER
Annecy SuperB Workshop

24. Annecy SuperB Workshop
LER Spin Rotators
2 SR just before and after the FF
4 solenoids and 5 quadrupoles each
Lower chromaticity
Biagini
Annecy SuperB Workshop

25. Annecy SuperB Workshop
Injection arc cells
Injection into rings is performed in one modified arc cell (very compact design)
High horizontal beta for higher efficiency
Kick needed is very small
Having dispersion at injection septum actually helps
Annecy SuperB Workshop

26. Frascati Site: Potential HER SR Beam Lines
Need cross-overs
Annecy SuperB Workshop

27. Frascati Site: Potential LER SR Beam Lines
Need cross-overs
Annecy SuperB Workshop

28. Annecy SuperB Workshop
Roman Villa
SPARX & SuperB
CNR
Sport City
University Campus
Tor Vergata
Annecy SuperB Workshop

29. Annecy SuperB Workshop
Site Geology
Formed by the Colli Albani volcano more than years ago
Very stable volcanic rock
S.1
S.2
S.3
S.4
S.5
Soil
Sea Level Altitude (m)
Brown Pyroclastic Rock
Gray Pyroclastic Rock
Preliminary
Annecy SuperB Workshop

30. Annecy SuperB Workshop
Roman Villa
Collider Hall
SuperB LINAC
SPARX
Annecy SuperB Workshop 30

31. Annecy SuperB Workshop
SR Conclusions
Several possibilities exit for placing SR beam lines on SuperB.
Need to find the best beam line locations.
Need to insert zero dispersion cells into the lattice where undulators are needed.
Need to calculate what the possible SR flux and brightness are.
Need a beam line layout plan for the lines.
Annecy SuperB Workshop