Seminars Archive

Scientific Opportunities with Diffraction Limited Advanced Light Sources.

Abstract
Today’s third-generation storage-ring-based light sources offer stable, nearly continuous, soft x-ray beams. These beams are excellent for studying the properties of homogeneous and simply organized solids, but, with today’s performance, are inadequate to elucidate the vast majority of functional complex materials, which are heterogeneous and can exhibit multiple phases and key structural features at the nanoscale. This limits our ability to obtain the knowledge needed to understand, design, and synthesize complex nanoscale structures, and to measure and optimize the nanoscale and larger scale processes that make materials functional and useful. Tomorrow’s frontier discoveries in soft x-ray science will require soft x-ray capabilities that far exceed those of the Advanced Light Source (ALS) or any other of today’s light sources. The proposed ALS Upgrade (ALS-U) is a multibend achromat (MBA), first implemented by MAXIV, which is optimized for soft x-rays with highest brightness and the coherent flux.

The focus of my talk is to present the science motivations and drivers for ALS upgrade through various examples and related information.


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Zahid Hussain, Bio
Dr. Zahid Hussain holds the ranks of senior staff scientist and Division Deputy for Scientific Support Group in the Advanced Light Source Division at the Lawrence Berkeley National Laboratory. He is also a consulting (adjunct) professor of Photon Science at SLAC /Stanford University. He is one of the world-leading experts in soft x-ray synchrotron radiation instrumentation and its applications where he has made many pioneering developments. More recently he pioneered the idea of ambient pressure photoemission which is now adapted by all synchrotron radiation facilities and commercially available by two companies. He is co-recipient of 2010 R&D 100 awards for this development. He also developed the concept of next generation of spin-resolved ARPES based on combination of time-of-flight electron energy analyzer and exchange scattering for spin polarization measurements. This system is ~1000 times more efficient than state-of-the-art commercial system and has received 2014 Klaus Halbach Award for Innovative Instrumentation and DOE/US patent. Dr. Hussain received the prestigious East-West Center Scholarship for carrying out PhD research both in University of Hawaii and Stanford University. He carried out his postdoctoral research with Prof David A Shirley, one of the pioneers of electron spectroscopy at University of California, Berkeley/Lawrence Berkeley National Laboratory. He is elected Fellow of the American Physical Society.

He has published over 300 papers in leading scientific journals, has collected about 15,000 citations. He is listed under 2014 highly cited/most influential scientific minds (http://highlycited.com) by Thomson Reuters. He has served in many committees such as member of Science Advisory Committee of LCLS and numerous Basic Energy Sciences, Department of Energy review committees for development of synchrotron radiation and free electron lasers.