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NSLS-II Photon Sources & Beamline Systems. Qun Shen Director, Experimental Facilities Division (XFD) NSLS-II Beamline Development Information Meeting April 14, 2010 Email: [email protected] Outline. NSLS-II Photon Sources Baseline & planned photon sources Spectral brightness & flux

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Nsls ii photon sources beamline systems

NSLS-II Photon Sources & Beamline Systems

Qun Shen

Director, Experimental Facilities Division (XFD)

NSLS-II Beamline Development Information Meeting

April 14, 2010

Email: [email protected]


Outline
Outline

  • NSLS-II Photon Sources

    • Baseline & planned photon sources

    • Spectral brightness & flux

    • Optimization of insertion devices

  • Beamline Systems

    • Overview of beamline systems

    • Beamline optics and expected performance characteristics

  • Guideline to design and construction schedule

  • Technical assistance by light sources staff


Design parameters of nsls ii storage ring
Design Parameters of NSLS-II Storage Ring

Overview of one super period of NSLS-II storage ring


Typical sector layout at nsls ii
Typical Sector Layout at NSLS-II

Low-b ID

3PW / BM

High-b ID

3PW / BM


Electron source size s h v and divergence s h v
Electron Source Size sh,v and Divergence s’h,v

High-b Straight Section (9.3m)

3-pole Wiggler Bending Magnet

Low-b Straight Section (6.6m)


Six beamlines in nsls ii construction project
Six Beamlines in NSLS-II Construction Project

  • Inelastic X-ray Scattering (IXS)

  • Hard X-ray Nanoprobe (HXN)

  • Coherent Hard X-ray Scattering (CHX)

  • Coherent Soft X-ray Scattering & Polarization (CSX)

  • Sub-micron Resolution X-ray Spectroscopy (SRX)

  • X-ray Powder Diffraction (XPD)

CSX 23-ID

XPD 28-ID

SRX 21-ID

CHX 5-ID

HXN 3-ID

Note: beamline location assignments preliminary

Conceptual design report posted at http://www.bnl.gov/nsls2/docs/PDF/ CDRs_SixProjectBeamlines_NSLS-II.pdf

IXS 10-ID


Currently planned insertion devices at nsls ii
Currently Planned Insertion Devices at NSLS-II

  • Undulators can be canted by 0-2 mrad in both low-b and high-b straight sections

  • DWs can also be canted but requires modification of vacuum chamber

Canting angle 0-2 mrad


Current and potential insertion devices at nsls ii
Current and Potential Insertion Devices at NSLS-II

* Requires additional R&D, with CPMU17 as near-term and SCU14 as far-term options






Spectral flux of nsls ii infra red sources
Spectral Flux of NSLS-II Infra-Red Sources

Standard gap BMs provide excellent mid and near IR sources;

Large gap (90 mm) BMs provide excellent far-IR sources


Optimization of Undulator Performance Given Accelerator Constraints

Radia Model (central part)

IVU Parameters

O. Chubar (NSLS-II)

Reference Geometry:

Pole Width: 40 mm

Pole Height: 25 mm

Pole Thickness: 3 mm (for λu = 20 mm)

Materials:

Pole: VaPermendur NEOMAX

Magnet: NdFeB

Magnet Width: 50 mm

Magnet Height: 29 mm

IVU Lengths Satisfying Vertical “Stay Clear” Constraints in Low- and High-Beta Straight Sections

Fundamental Photon Energy vs Gapfor Different IVU Periods (E = 3 GeV)

λu= 23 mm

λu= 22 mm

λu= 21 mm

βy0 = 3.4 m

λu= 20 mm

βy0 = 1.06 m


Spectral Flux of Different IVUs – IXS “Candidates” – Satisfying e-Beam Vertical “Stay Clear” Constraint

Maximal Spectral Flux through 100 μrad (H) x 50 μrad (V) Aperture

E-Beam Energy: 3 GeVCurrent: 0.5 A

NSLS-II

High-Beta (Long) Straight Section

~9.13 keV

  • Such insertion device optimization is done during conceptual design

  • Not necessary for beamline development proposal

O. Chubar (NSLS-II)

~9.13 keV


Three-pole Wigglers

  • Added to provide hard x-ray dipole radiation with no significant impact on the emittance

  • Up to 30 can be added to the lattice upstream of each dipole B

-1.5 mrad

0 mrad

3PW

BM-B

BM-A

+2.125 mrad

+2.5 mrad

+4.25 mrad


3PW and BM Power Density Distributions

Magnetic Field

Power Density Distribution from different parts of TPW and BM at 30 m (single-electron emission, integral over all photon energies, horizontal cuts at y = 0)

|θX| = 4.25 mrad

θX= 0

|θX| ≈ 2.6 mrad

1.65 mrad

O. Chubar (NSLS-II)


3PW and BM Intensity Distributions (Hard X-rays)

  • Intensity distributions at different photon energies at 30 m from 3PW show effects from soft poles in 3PW and from adjacent BMs

  • Effect of such non-ideal intensity distribution on microfocusing is being studied by a working group, and updates will be provided

O. Chubar (NSLS-II)

Vertical Cuts at x = 0

Horizontal Cuts at y = 0


Beamline systems overview
Beamline Systems Overview

Utilities and safety system (PSS, EPS)

Front-end (inside storage ring tunnel)

Endstation and experiment controls

Enclosures and beam transport

Photon optical system


Optical systems
Optical Systems

  • Beamline optical systems are key functional elements of any synchrotron beamline. Functions may include:

    • Monochromators (single-crystal optics, gratings, multilayers)

    • Beam conditioning (mirrors, focusing optics)

    • Beam filtering (spectral filter, harmonic rejection mirror, spatial filter or beam-defining slits)

    • Power handling (high heat-load optics)

    • Imaging optics (zone-plate objective)

HXN Beamline Optical Layout (top view)

Yong Chu (NSLS-II)


Power outputs from insertion devices
Power Outputs from Insertion Devices

O. Chubar (NSLS-II)

  • APS U33 2.4m produces similar power per unit solid-angle as NSLS-II IVU22 6m


Cryogenic vs water cooling of si optics
Cryogenic vs. Water Cooling of Si Optics

NSLS-II U20 @ min. gap: 1.8mm(h) x 0.9mm(v)

Bragg angle = 14o

Absorbed Power ~113W

Peak Temp: 116.5 K

Slope Error: 0.4 mrad (due to thermal bump)

  • Cryogenically cooled Si is needed (and is expected to work) for NSLS-II undulator sources

  • Water cooling is adequate for NSLS-II 3PW/BM sources

V. Ravindranath (NSLS-II)


Variety of cutting edge focusing x ray optics
Variety of Cutting-Edge Focusing X-ray Optics

  • Kirkpatrick-Baez (K-B) mirrors

    • Large acceptance aperture, achromatic focusing for easy energy scanning

    • Focal size limited by critical angle: achieved ~25 nm

  • Compound Refractive Lens

    • Refraction effect is weak so requires many lenses

    • Shape errors affect focal size: achieved ~50 nm

  • Conventional Fresnel zone plate (FZP)

    • Easy to use, good efficiency for soft x-rays but poor efficiency for hard x-rays

    • Focal size limited by smallest features that can be fabricated: achieved ~15 nm

  • Multilayer Laue-Lens (MLL)

    • High aspect ratio (>1000) Fresnel zones can be fabricated; good for hard x-rays

    • Difficult to tune energy

    • Theory shows <1 nm possible: achieved ~16 nm (1D)

  • Multilayer mirrors

    • Good energy tunability; requires ultralow surface finish and precision ML deposition

    • Focal size limited by ML mirror slope errors: achieved ~8 nm (1D)

Above – XRF imaging of a test pattern, scanned through 2D focusing by crossed MLL, with resolution ~20nm x 40nm

Yan, Conley, Lima et al. (NSLS-II)

Maser, Macrander, Shu et al. (ANL)


Canted Beamline Example: SRX Beamline

Thieme et al. (NSLS-II)

KB branch

ZP branch

  • Two x-ray branches using two ~1.5m long U21-type undulators canted by 2 mrad

  • Two hor. mirrors to deflect ZP beam out to allow ~0.5 m separation in ZP hutch


Coherent Soft X-ray Beamline

Sanchez-Hanke, Reininger, et al. (NSLS-II)

Full polarization control branch

Coherent branch

  • Two soft x-ray branches using 2x EPUs canted by 0.16 mrad

  • Branching mirror M1-A to deflect beam outward for the coherent branch



Assisting users in beamline proposal process
Assisting Users in Beamline Proposal Process

  • BNL Light Sources scientific staff are part of the scientific user community, and their expertise can be very useful in the beamline development proposal process. NSLS-II and NSLS staff are encouraged to help out user groups who may need certain guidance and technical assistance

  • This help may be in following forms

    • Providing advice and guidance in specific area of expertise;

    • Providing specific technical information such as source properties and existing optical concepts of existing project beamlines; and

    • Helping to address certain technical issues on conceptual level if appropriate.

  • Due to limited resources, NSLS-II and NSLS would not be able to provide engineering assistance on technical problems during BL proposal process


Beamline development sources optics group
Beamline Development Sources & Optics Group

  • Beamline Development Sources & Optics Group has been established to assist user groups on specific technical information and on addressing specific technical issues that may have broad interest in the community

  • Users are encouraged to contact the members in specific areas of expertise

  • Members of the Group:

  • Group meets weekly to discuss any issues that requires attention; XFD Director participates in these meetings to provide oversight and to communicate any additional information as needed


Beamline development beamline contact group
Beamline Development - Beamline Contact Group

  • Beamline Contact Group consists of existing beamline group leaders and others with specific expertise in particular type of beamlines; User groups are encouraged to contact the appropriate staff for questions and answers generally related to the type of beamlines of interest.

  • Beamline Contacts:

    • Cecilia Sanchez-Hanke / Ruben Reininger – soft x-ray and VUV beamlines

    • Lonny Berman – 3-pole wiggler and bend-magnet x-ray beamlines

    • Eric Dooryhee – Damping wiggler x-ray beamlines

    • Andrei Fluerasu / Juergen Thieme – undulator x-ray beamlines

  • Beamline contact may seek additional help from the Sources and Optics group to discuss any technical issues, by communicating the topic to any member in the Sources and Optics group.


Thank you questions
Thank You! Questions ??


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