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NOV
9
Thursday
NSLS-II Colloquium Series
"Imaging dynamics of radiation-sensitive molecules."
Presented by John Spence, Physics, Arizona State University, Tempe, AZ
4 pm, Large Seminar Room, Bldg. 510
Thursday, November 9, 2017, 4:00 pm
Hosted by: 'John Hill'
The possibility of out-running radiation damage by the "diffract-and-destroy method, using femtosecond pulses of either electrons or hard X-rays, opens completely new vistas for imaging molecular dynamics at atom resolution and sub-picosecond speeds (1). First, I'll compare high-energy electron beams for this purpose, and compare them in regard to damage mechanisms and time-scales with XFEL radiation. I'll suggest a fast mode of image formation which provides high resolution despite the use of the large incoherent photocathode. I'll then review our work using the hard X-ray pulsed laser at SLAC within our BioXFEL 6-campus NSF consortium (http://www.bioxfel.org), aimed at the application of X-ray lasers (XFELs) to Structural Biology. I'll show molecular movies from light-sensitive proteins with 150 fs time resolution and near-atomic spatial , using both crystals and solution scattering obtained from the LCLS XFEL at SLAC, and very recent single-particle virus images (one virus per shot) showing dynamics. I'll discuss work in my lab on methods for hydrated sample delivery for an XFEL, and the compact IC XFEL under construction on the ASU campus, which uses a laser as an undulator. Finally, I'll review a recent proposal for the use of intensity interferometry to analyze the angular dependence of inner-shell X-ray fluorescence from a molecule. See Google Scholar for references and the many collaborators whom I thank. 1. J.Spence. XFELS for structure and dynamics in biology. IUCrJ 4, 322 (2017).
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NSLS-II Colloquium Series
"From single atom magnets to ultrafast switching: Insights from x-ray absorption spectroscopy and microscopy"
Presented by Pietro Gambardella, Department of Materials, ETH Zurich, Switzerland
Thursday, October 12, 2017, 4 pm
Large Seminar Room, Bldg. 510Hosted by: '''''John Hill'''''
What is the smallest possible size of a magnet? How fast can we switch the magnetization of a thin film? The answer to these simple questions reveals a fascinating world of interactions, which are largely dominated by interface effects. Understanding and controlling such interactions opens new perspectives for classical and quantum data processing technologies at the microscopic scale. Synchrotron radiation measurements exploiting x-ray dichroism at the L- and M-edges of the transition metal and lanthanide elements, respectively, provide a unique spectroscopic and microscopic tool to link the nanoscale properties of matter to the magnetic behavior of different classes of materials. In this talk, I will describe our studies of the evolution of magnetism from single atoms to nanoparticles and molecular magnets [1-4], focusing on the conditions required to achieve magnetic bistability in small systems [5,6]. I will further report on recent efforts to induce magnetization switching using electrical currents in materials characterized by strong spin-orbit interactions [7,8]. Current pump/x-ray probe experiments reveal the mechanism and time scale of magnetization reversal induced by the spin–orbit torques and spin Hall effect in thin film heterostructures, which has applications in ultrafast magnetic random access memories with high endurance [9,10]. [1] P. Gambardella et al., Phys. Rev. Lett. 88, 047202 (2002). [2] P. Gambardella et al., Science 300, 1130 (2003). [3] P. Gambardella et al., Nature Mater. 8, 189 (2009). [4] S. Stepanow et al., J. Am. Chem. Soc. 136, 5451 (2014). [5] I. G. Rau et al., Science 344, 988 (2014). [6] F. Donati et al., Science 352, 318 (2016). [7] I. M. Miron et al., Nature 476, 189 (2011). [8] K. Garello et al., Nature Nanotech. 8, 587 (2013). [9] M. Baumgartner et al., Nature Nanotech., in press (2017). [10] G. Prenat et al., IEEE Transactions on Multi-Scale Computing 2, 149 (2016).
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NSLS-II Friday Lunchtime Seminar Series
"Complex Materials Scattering (CMS) beam line update and "Frontier Microfocusing Macromolecular Crystallography (FMX) beamline update"
Presented by Masafumi Fukuto and Martin Fuchs, NSLS-II, BNL
Friday, October 6, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: ''Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang''
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NSLS-II Seminar
"Front Ends and Insertion Devices for APS Upgrade"
Presented by Mohan Ramanathan, Argonne National Laboratory
Thursday, October 5, 2017, 2 pm
Bldg 744 Room 156Hosted by: 'Sushil Sharma'
The Advanced Photon Source (APS) Upgrade Project is a major redesign of the current operating machine to a new multi-bend low emittance lattice operating at 6 GeV with 200 mA of stored beam. To fully support the APS Upgrade (APS-U), the front ends and insertion devices (IDs) located inside the storage ring tunnel need to be upgraded. Most of the front ends at the APS were designed more than 20 years ago and have limitations in the power handling capability. As part of APS Upgrade all the ID front ends will be replaced to one of two types – capable of handling the full straight section of IDs or canted with two ID beams. At the current time, the APS has 54 IDs in operation over 33 beamlines. Most of the devices were optimized more than 20 years ago for 7-GeV operation, providing full energy tunability in the hard x-ray range. To maximize the brightness and flux for all the beamlines (also part of the APS-U), most of the IDs will be replaced. This seminar will provide an overview of the plans for the front ends and insertion devices for the APS-U.
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NSLS-II Engineering Seminar Series
"Bridging The Gaps Between Mechanical Engineering, Electrical Engineering, and Motion Control for NSLS-II"
John Escallier, Brookhaven National Laboratory
Tuesday, September 12, 2017, 2 pm
John Dunn Seminar Room, Bldg. 463Hosted by: ''Sushil Sharma and Mary Carlucci-Dayton''
Mechanical design constraints in many cases can present difficult and unintended motion control challenges in many instruments such as frontend slits, insertion devices, mirrors and monochromators. Design decisions for meeting science requirements often times introduce control stability issues that seldom arise in non-scientific equipment. The Delta Tau motion system is an extremely versatile platform for this control, but also presents a severe learning curve as a result of the versatility. This presentation will demonstrate how subtle geometry effects can create large control problems, and how to look for those subtle "opportunities."
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NSLS-II Seminar
"On the assessment of radiation damage and high temperature effects in novel nuclear materials using the BNL accelerators and synchrotrons"
Presented by Nick Simos, Sr Scientist Emeritus, BNL
Friday, September 8, 2017, 3 pm
Large Seminar Room, Bldg. 510Hosted by: ''Ron Pindak''
In search for new and improved materials, composites and super-alloys capable of withstanding the anticipated extreme states associated fusion reactors; high temperature fast reactors and multi-MW particle accelerators, novel reactor steels, super-alloys and composites are continuously being explored to help meet both the challenge of the higher demand environments and the intended application. Higher fluxes and fluences of irradiating species (neutrons and/or protons), extreme temperatures and aggressively corrosive environments make up the new cocktail of operating conditions of the new array of material structures. One of the challenges in characterizing the effects that high radiation fluxes of neutrons and protons induce on these novel material structures in conjunction with high temperatures is the link between lattice induced damage and phase transformation and macroscopic physical properties which ultimately determine performance in the real environment. High energy X-rays at the BNL synchrotrons have offered a path in establishing this important connection between micro-scale effects and physical properties of novel material structures exposed to high radiation fluxes. Specifically, by integrating the unique capabilities of the BNL accelerator complex that includes, in addition to the NSLS and NSLS II, the proton accelerator and Tandem as well as those of CFN, the evolution and/or damage of materials ranging from classical structures such as graphite, beryllium and steels to novel super-alloys, such as those of Invar and "Gum" metal, and new composites have been characterized both at the two length scales. The pivotal role of high energy X-rays from NSLS to NSLS II in making the connection will be presented demonstrating the enormous potential of the NSLS II in answering fundamental questions in our path towards the next generation nuclear materials. Furthermore, first glimpses of the correlation of lattice effects or damage induced by differ
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NSLS-II Colloquium Series
"Experiments, Analyses, and Manipulations with Particle Beam"
Presented by Shyh-Huan Lee, Indiana University, IN
Thursday, September 7, 2017, 4 pm
Large Seminar Room, Bldg. 510Hosted by: ''''''''''John Hill''''''''
Progress on particle beam physics research have provided marked improvements in beam intensity, brightness, and stability advancing frontier research in applied and fundamental science. This talk will review some beam measurements and manipulation studies being undertaken to improve beam performance in storage rings. Hopefully, these studies will be relevant to the operation and improvement of National Accelerator User Facilities.
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NSLS-II Engineering Seminar Series
"The Diamond Storage Ring: Recent Enhancements and Future Plans"
Nigel Hammond, Diamond Light Source Ltd., United Kingdom
Tuesday, August 15, 2017, 2 pm
John Dunn Seminar Room, Bldg. 463Hosted by: ''Sushil Sharma & Mary Carlucci-Dayton''
Several recent improvements have been completed, or are in progress, for the Diamond Light Source Storage Ring. This presentation will summarise changes in respect of the lattice (The Double-Double Bend Achromat) and the practicalities of carrying out this change, vibration mitigation, and improved monitoring of dissolved oxygen in the cooling water. In addition the current plans for a complete upgrade of the Storage Ring will be outlined.
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NSLS-II Friday Lunchtime Seminar Series
"Structural Characterization of Sulfhydrated Proteins Involved in Oxidative Stress"
Presented by Ruth Pietri, University of Puerto Rico
Friday, August 11, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang'
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NSLS-II Seminar
"Physical Sciences Electron Microscopes"
Presented by Dr. Cecilia Sanchez-Hanke, Diamond Light Source, United Kingdom
Monday, August 7, 2017, 11 am
NSLS-II Bldg 743 (LOB3), room 156Hosted by: ''Klaus Attenkofer''
Electron microscopes (EM) are getting more and more visibility at large facilities such as radiation sources. At Diamond, we have established a collaboration with the Industry and the University to install two high-end microscopes. The selected final location for the microscopes was the same building as I14 Diamond's Nano-probe beamline because of the similar mechanical stability specifications so that these aberration corrected Electron Microscopes can go beyond the atomic resolution. I will be talking about the advantages of having at Diamond these instruments, that in no doubt are complementary to the beamlines. And the challenge that we encounter to try to bring the photon based community into the electron microscopes and vice versa.
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NSLS-II Friday Lunchtime Seminar Series
"From Particles to Patients: The Role of an Epoxide Hydrolase in P. Aeruginosa Virulence"
Presented by Kelli Hvorency, 2017 Julian D. Baumert. PhD. Thesis Award Winner, Dartmouth College
Friday, August 4, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: ''Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang''
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NSLS-II Friday Lunchtime Seminar Series
"Special Edition: Enjoy an hour of interesting science from our summer student interns."
Presented by N. Hameed, A. Lowery, T. Solomon, P. Panica & A. MacGregor
Friday, July 28, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: '''''''Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme an
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NSLS-II Friday Lunchtime Seminar Series
"Understanding Energy Storage Materials in Model Systems using X-ray Scattering" and "Development of Submicron Capillary Optics"
Presented by Hans-Georg Steinrück and Benjamin Stripe, Stanford Synchrotron Radiation Lightsource and Sigray Inc.
Friday, July 21, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang'
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NSLS-II Friday Lunchtime Seminar Series
"Bio-cryo Electron Microscopy: The Opportunity and Plan" and "Characterizing Self-Assembled Nanoparticles Employed in Drug Delivery Systems"
Presented by Sean McSweeney and Kazuo Sakurai, NSLS-II, BNL and University of Kitakyushu
Friday, July 14, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: ''Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang''
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NSLS-II Friday Lunchtime Seminar Series
"In-situ Studies of the Reforming Reactions on Ceria-based Catalysts for the Production of Hydrogen"
Presented by Zongyuan Liu, BNL, Chemistry Department
Friday, June 16, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko, Shirish Chodankar, Milinda Abeykoon, Juergen Thieme and Guimei Wang'
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NSLS-II Engineering Seminar Series
"Thin Films for X-Ray Optics"
Raymond Conley, Advanced Photon Source
Tuesday, June 13, 2017, 2 pm
John Dunn Seminar Room, Bldg. 463Hosted by: 'Sushil Sharma and Mary Carlucci-Dayton'
In order to produce high quality optics, deposition equipment must be designed with the utmost in stability and flexibility. Limitations encountered with the first generation of APS deposition systems led to new designs, including the NSLS-II MLL Deposition System and three machines at the APS. The goals for the latest machine, called the "Modular Deposition System" are not only to produce a wide variety of multilayer and other thin-film based x-ray optics, but also to allow the APS to initiate an ion-beam figuring (IBF) based mirror surface correction capability. Off-line surface metrology can be utilized for iterative feedback into the fabrication process, however, the prospect of obtaining surface figure information without the need to extract the substrate from the vacuum chamber provides a number of performance advantages such as increased throughput, quasi-real time deposition feedback, and the flexibility to work with reactive materials. By locating the interferometry transmission flat remotely within the UHV system, errors in the measurement induced by environmental factors such as air turbulence and humidity may be minimized. Provisions for a dynamically-actuated aperture will be used to explore methods for 3-D multilayer deposition intended to enable the use of new optical geometries and allow for higher efficiency and mirror figure correction. Multilayer deposition will be the first priority for the machine, while the other features related to metrology, figuring, and the dynamic aperture will be brought online later as they are developed.
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NSLS-II Friday Lunchtime Seminar Series
"Status of SSRF and the Shanghai X-FEL Projects, and Efforts in Single Particle Imaging and Whole Cell Imaging with X-FELs"
Presented by Thomas Earnest, Shanghai Synchrotron Radiation Facility
Friday, May 12, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Friday Lunchtime Seminar Series
"Meeting the Challenges and Expectations of Automated, Data Intensive Experiments at Diamond Light Source" and "Scientific Computing at the ESS"
Presented by Alun Ashton and Jon Taylor, Diamond Light Source Ltd and European Spallation Source ERIC
Friday, April 21, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Friday Lunchtime Seminar Series
""Iridium Thiospinel - Orbital Parts Unknown" and "Graphene-Based Microfluidics for Serial Crystallography"
Presented by Emil Bozin and Sarah L. Perry, CMPMS/BNL and University of Massachusetts Amherst
Friday, March 31, 2017, 12 am
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Friday Lunchtime Seminar Series
"Revealing the Local Atomic and Magnetic Structure of a New Dilute Ferromagnetic Semiconductor by Pair Distribution Function Analysis" and "Resonant Scattering on T' cuprates""
Presented by Benjamin Frandsen and Jonathan Pelliciari, Lawrence Berkeley National Laboratory and Massachusetts Institute of Technology (MIT)
Friday, March 24, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Friday Lunchtime Seminar Series
"X-ray Amplification (XAMP) of Meso-scale Structures" and "Structure Solution and Refinement of Stacking Faulted NiCl(OH)"
Presented by Julien Lhermitte and Sebastian Bette, CFN, BNL and Max Planck Institute for Solid State Research, Germany
Friday, March 17, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Engineering Seminar Series
"High-Resolution Monochromator Development for Nuclear Resonant Scattering"
Presented by Thomas Toellner, X-Ray Science Division,
Tuesday, March 7, 2017, 2 pm
John Dunn Seminar Room, Bldg. 463Hosted by: ''Sushil Sharma and Mary Carlucci-Dayton''
High-resolution monochromators (HRMs) are key components at nuclear resonant scattering beamlines, and their development at the APS has been ongoing for decades. They are used to resolve the frequency spectrum of isotope-specific atomic dynamics using nuclear resonant vibrational spectroscopy and to reduce the enormous electronic charge scattering that accompanies nuclear excitation using synchrotron radiation. The latter allowing the measurement of hyperfine fields using synchrotron Moessbauer spectroscopy. The narrow line-widths (neV) associated with nuclear resonances also offer an excellent diagnostic tool for the characterization of HRMs, and have greatly facilitated their development. HRMs with ultra-high energy-resolution exposed the need for greater energy-alignment stability and prompted the development of cryo-stabilization. A recent prototype sub-meV-bandwidth monochromator for hard X-rays that implements cryo-stabilization has been built that displays a 100-fold improvement in energy-alignment stability over other designs. This unprecedented level of control allows one to observe the intrinsic factors that limit the energy resolution obtainable with silicon. I will present the principle design aspects of this prototype along with its performance, and discuss what has been learned.
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NSLS-II Friday Lunchtime Seminar Series
"Elemental Concentration and Size Apportionment of Combustion Particles from Wood-fired Appliances" and "Creating Methods for Material Design and Synthesis for Microporous and Mesoporous Materials"
Presented by Monica Gray-Georges and Nicholas Brunelli, Lincoln University of Pennsylvania and Ohio State University
Friday, March 3, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: ''Ben Ocko and Shirish Chodankar''
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NSLS-II Friday Lunchtime Seminar Series
"Wide Bandgap Semiconductors: A Solution for Next Generation Radiation Detector"
Presented by Anwar Hossain, Nonproliferation and National Security Department, BNL
Friday, February 24, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Engineering Seminar Series
"Hard X-ray Imaging with Sub-20 nm Spatial Resolution: Instrumentational Challenges and Solutions"
Evgeny Nazaretski, NSLS-II, BNL
Tuesday, February 14, 2017, 2 pm
John Dunn Seminar Room, Bldg. 463Hosted by: 'Sushil Sharma and Mary Carlucci-Dayton'
The Hard X-ray Nanoprobe (HXN) beamline at NSLS-II has been designed and constructed to enable imaging experiments with unprecedented spatial resolution and detection sensitivity. The HXN x-ray Microscope is a key instrument for the beamline, providing a suite of experimental capabilities which includes scanning fluorescence, diffraction, differential phase contrast and ptychography utilizing Multilayer Laue Lenses (MLL) and zone plates (ZP) as nanofocusing optics. During this presentation, different phases of the X-ray microscope development process will be reviewed. Various prototype systems designed and constructed prior to completion of the HXN-microscope will be discussed. Experimental data demonstrating ~15 x 15 nm spatial resolution imaging using MLL optics will be presented. I will discuss instrumentational challenges associated with high spatial resolution imaging and will outline future development plans.
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NSLS-II Friday Lunchtime Seminar Series
"X-ray Amplification of Mesoscale Structures" and "NSLS-II Fast Orbit Feedback System"
Presented by Julien Lhermitte and Yuke Tian, CFN, BNL and Photon Sciences, BNL
Friday, February 10, 2017, 12 pm
NSLS-II Bldg 743 (LOB 3), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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NSLS-II Colloquium Series
"Operando Spectroscopy of a Catalytic Solid: Towards a Molecular Movie"
Presented by Bert Weckhuysen, Utrecht University Netherlands, Netherlands
Wednesday, November 30, 2016, 4 pm
Large Seminar Room, Bldg. 510Hosted by: 'Eli Stavitski'
The search for new or more effective catalysts would benefit from a multiscale science approach bridging the molecular world with the macroscopic world. Such detailed information can be realized if we would have access to a very powerful camera shooting molecular movies of a catalytic solid at work. This is the field of operando spectroscopy and recent breakthroughs in chemical imaging techniques, based on optical, electron and X-ray methods, demonstrate that such molecular movie concept is within reach. This lecture discusses the recent advances in spectroscopy and microscopy of catalytic solids at different length scales, starting from single molecules and single atoms up to the level of individual catalyst particles and ensemble effects in a reactor bed. Special emphasis will be devoted to the exploration of mesoscale effects in catalytic solids.
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NSLS-II Friday Lunchtime Seminar Series
"Thin Film Crystalline Stratification and Anisotropic Thermal Expansion investigated with Grazing Incidence X-ray Scattering"
Presented by Eliot Gann, NIST
Friday, November 11, 2016, 12 pm
NSLS-II Bldg 744 (LOB 4), room 156Hosted by: 'Ben Ocko and Shirish Chodankar'
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