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NSLS-II User Workshop Breakout Sessions A, B, C, D, E

July 18, 2007

> User Workshop Home  |  Sessions F, G, H, I, J  |  Science-Based Discussion Groups

 
Session A: Hard X-ray Nanoprobe

Chair: K. Evans-Lutterodt

A hard X-ray nanoprobe beamline that will produce, and utilize, a beam of hard Xray photons with a minimum beam size in the nanometer range will be built as part of the initial suite of beamlines at NSLS-II. Such a beamline will allow the study of materials with spatial variation in the nanometer range. The primary experimental techniques for this beamline are expected to be scanning nanobeam techniques, augmented by a limited full-field capability. For the scanning probe techniques, a variety of contrast mechanisms will allow the extraction of useful information from a real-space mapping of a sample. Contrast mechanisms include: the density, elemental composition, crystallographic phase, strain, texture, chemical state, local atomic environment, and magnetization. This session will begin with presentations by Martin Holt (ANL) and Gene Ice (ORNL) that will frame the discussion on possible science drivers for such a beamline, and will conclude with an open floor discussion for user input. Among the goals for the session are to seek to define the scientific missions of this instrument, which will in turn lead to technical specifications for the nanoprobe beamline, and to begin to document the user community for this instrument.

> Session Summary

Invited Speakers: A. Frenkel, (Yeshiva Univ.), M. Holt (ANL, APS), G. Ice (ORNL), S. Vogt (ANL, APS)


Session B: Soft Coherent Scattering and Imaging

Chairs: C. Sanchez-Hanke, C. Jacobsen

The soft x-ray coherent scattering and imaging session will focus on the soft x-ray insertion device beamline. The session will open with a perspective by Steve Kevan of the University of Oregon on the scientific opportunities provided by coherent soft x-ray studies of hard and soft materials, and it will be followed with a presentation by Steve Hulbert of NSLS/NSLS-II on the present conceptual design for this beamline. The projected capabilities of this beamline are exciting, with a soft x-ray brightness and coherent flux that will be world-leading. To fulfill the increasing trend of polarization sensitive measurements in the soft x-ray energy range, we expect that the beamline source will provide circular and linear polarized soft x-rays, with the additional capability of fast switching between polarization at frequencies up to 1 kHz. For more information on the present beamline design see the NSLS-II Conceptual Design Report chapter on Experimental Facilities (PDF).

What are the capabilities needed for future soft x-ray experiments? What is the demand, both for this construction project beamline and for other soft x-ray beamlines? What investigators have similar or complimentary requirements so that they might logically form beamline teams? To begin to address these questions, we invite you to contribute your comments, suggestions and requests regarding beamline design and end-station capabilities to perform both your present experiments, and the experiment that you have in mind but havent found yet the beamline where to carry it out. The contributions can be made either by email to hanke@bnl.gov, or preferably in one or two slides at the breakout session. Please feel free to contact the organizers if you want to participate in the workshop with a 5 minute presentation.

> Session Summary



Session C: Powder Diffraction

Chair: P. Siddons, P. Stephens, J. Parise

As part of the construction project, NSLS-II will build a powder diffraction beamline located on a wiggler source. This source has a critical energy of 10.8 keV, brightness of 10^18 photons / sec / 0.1% bw /mm^2 / mrad^2 at 50 keV, and flux of 5 x 10^14 photons / sec / 0.1% bw @ 50 keV (for more details see the NSLS-II Conceptual Design Report. This discussion session will seek to begin to define the scientific mission of this beamline and the required technical capabilities. Topics to consider include:

  • integrating beamline design with sample environments
  • next generation powder diffraction
  • related techniques such as pair distribution function
  • new detection modes and detector capabilities (e.g., not-quite-powder samples: 10-1000 crystals in a sample measured with an area detector)
  • new scientific opportunities and the scientific case for the beamline

> Session Summary


Session D: Macromolecular Crystallography

Chairs: B. Sweet, V. Stojanoff

Macromolecular crystallography (PX) is the mainstay of modern research into biological function, and synchrotron radiation plays a role in almost all new crystal structures. The specific aim of this PX breakout session is to function as a working group to plan how to move forward to provide PX facilities for the community at the opening of NSLS-II, in parallel with the Project Beamlines.

This two hour workshop will be divided into two parts. The first will be lectures: a description of state-of-the-art apparatus and methods for third-generation beamlines, and summaries of two research projects that will benefit from NSLS-II. The second will be open discussion among those present about how to meet the aim of the working group.

Attendees might survey past history by an examination of the summary report from the 2004 workshop, which established the scientific case for PX at NSLS-II.

> Session Summary


Session E: Liquid Interfaces

Chairs: E. Dimasi, M. Schlossman, M. Fukuto

Liquid surface diffractometers at synchrotron and neutron sources worldwide impact a wide spectrum of scientific problems. Metallic, polar, and aqueous liquids all exhibit surface structure and phase behavior distinct from the bulk. Thermotropic phase transitions and chemical and biological reactions have been probed with dynamic measurements. Biomedical applications include pulmonary lung surfactants, protein structure, and membrane mimetic systems.

Looking to the future, new areas of interest encompass high energy techniques at buried interfaces, resonance from light elements, photon correlation spectroscopy, new detection modes and detector capabilities, and an ever-evolving suite of ancillary instrumentation which can be applied simultaneously with x-ray scattering. The liquid interfaces x-ray scattering breakout session will discuss scientific opportunities presented by the unique capabilities of NSLS-II and create a blueprint for the next generation of instrumentation to be developed at this facility.

> Session Summary

 

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