11-ID External Website

Beamline 11-ID

  • General Information
    • Source Type
      The X-ray source of the CHX beamline is a 3m long in-vacuum undulator with 20 mm magnetic period, located in a low-beta straight section of the NSLS-II storage ring (IVU20)


      General User Beamtime

      Energy Range Category
      Hard X-Ray (1-50 keV)

      Energy Range
      6-16 keV

      Beamline Type
      Facility Beamline

      Beamline Description
      The CHX beamline, one of the NSLS-II project beamline, is dedicated to studies of the nano-scale and meso-scale dynamics of materials using coherent X-ray scattering. As a result of the unprecedented source brightness, this beamline will enable measurements on time scales that can be several orders of magnitude faster than what is achievable at current facilities.

      X-ray Photon Correlation Spectroscopy
      X-ray Scattering, Small- and Wide-angle

      Research Types
      Coherent Hard X-ray Scattering X-ray Photon Correlation Spectroscopy (Dynamics) SAXS, GI-SAXS, WAXS

  • Contact Information
    • Spokesperson The person from each beamline who acts as a contact point between the beamline management and NSLS administration. Contact for questions about the beamline scientific program, experimental capabilities, and beamline management.
      Andrei Fluerasu, Brookhaven National Laboratory, fluerasu@bnl.gov, 344-4645
      Lutz Wiegart, Brookhaven National Laboratory, lwiegart@bnl.gov, 344-8064

      Local Contact The beamline staff member who is typically responsible for overseeing the daily operation and maintenance of the beamline. Contact for questions about beamline instrumentation, experimental details, and training.

      Beamtime Scheduler The beamline staff member responsible for coordination of beamline schedule every trimester. Contact for questions about beamtime scheduling.

      Beamline Phone

  • Instrumentation
    • Beamline Characteristics

      Energy RangeMono Crystal or GratingResolution (ΔE/E)FluxSpot Size (mm)Total Angular Acceptance (mrad)
      6-16 keV Double crystal monochromator Si(111), Si (220) 10-4 1011 ph/s 2-20 μm
      Also Double Multilayer Monochromator (planed for 2017-1) with [CAPITAL_DELTA][SMALL_LAMBDA]/[SMALL_LAMBDA]=10[SUP]-3[/SUP] and ~10[SUP]12[/SUP] ph/s

      Source Type
      The X-ray source of the CHX beamline is a 3m long in-vacuum undulator with 20 mm magnetic period, located in a low-beta straight section of the NSLS-II storage ring (IVU20)

      Optical System
      The first optical element is a water-cooled horizontally deflecting flat mirror at fixed incidence angle (HDM). The cryo-cooled, pseudo-channel-cut Double Crystal Monochromator (DCM) provides a choice of Si111 or Si220 crystals in vertical scattering geometry. The crystals can be completely removed from the beam for operation with a wider band-pass monochromatic beam using the Double Multilayer Monochromator (DMM). The DMM houses two sets of substrates in horizontal reflection geometry, one set is coated with multilayers, while the other set provides bare and Rh coated Si stripes for use as a Harmonic Rejection Mirror (HRM) in monochromatic operation mode. It is also possible to remove both DMM and HRM completely from the beam (this is the most likely 'day 1' operating mode) Vertical focusing of the X-ray beam in a x:y geometry is accomplished by water-cooled 1D compound refractive lenses. To achieve nearly achromatic focusing, different sets of lenses are available in a so-called Transfocator that also exhibits a large travel range along the beam direction. A safety shutter is located at the end of the FOE that allows keeping the high heat load synchrotron beam on the optical elements while entering the endstation. The CHX endstation is equipped with two kinoform focusing units (KL1) and (KL2). Each unit hosts Si wafers with various lenses for different energies and the units provide a travel range along the beam direction to make the focusing more achromatic. For typical SAXS experiments, KL1 is used for horizontal focusing, whereas in WAXS experiments KL1 is used for vertical focusing and KL2 for horizontal focusing.

      Experimental Apparatus
      The CHX endstation provides a flexible instrument optimized for coherent X-ray scattering studies in SAXS or WAXS geometries, including the possibility of achieving grazing incidence (GI) on liquid samples for GI-SAXS/WAXS. This combination is of particular interest for studies of complex materials and understanding the interplay between structure and dynamics. The endstation features an optics table hosting several beam defining optics, a versatile diffractometer providing both horizontal and vertical scattering geometries and a SAXS table with adjustable flight tube length (up to 15 m).

      Computer System Hardware & Software
      Beamline control is achieved from EPICS via the "Control System Studio" (CSS) which is a set of graphic users interfaces allowing to control each instrument, or "ophyd", a python-based ("spec-like") command line interface for scanning. Data analysis is performed in python with tools provided for standard XPCS analysis

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