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Ring Leaders
March 2013 Print

Eli Rotenberg, Staff Scientist


After 20 years of photoemission research at Beamline 7, ALS Senior Scientist Eli Rotenberg has taken on a new role in overseeing a complete rebuild of the beamline and its endstations. The project will expand Beamline 7’s footprint to include three endstations, three preparation chambers, and space to expand. The new setup will offer 1000-times better spatial resolution and at least 10-times better energy resolution.

“Beamline 7 wasn’t initially built for very high energy resolution,” says Rotenberg. “When it was built it was very good in other regards – high brightness and small spot size – but after 20 years the beamline and endstations were a bit mismatched.”

The endstations at Beamline 7 had evolved over the years to be pretty state-of-the-art; users come from around the world to do electronic structure research here. Rotenberg has always seen the potential for improving the 50-micron beamline resolution. About 10 years ago, he began building support for a proposal to get the resolution to less than a micron and bring the energy resolution up to current standards at the same time.

“We’re always trying to keep up with the state-of-the-art,” says Rotenberg. “At the time our proposal was submitted, it was revolutionary.”

Users have come to rely on Beamline 7 as a top-of-the-line facility for growing their own crystals and measuring them in place, a capability that Rotenberg says has been perfected in large part because of close collaboration with users. The rebuild will expand these capabilities with advanced spatial resolution, which will benefit users and Rotenberg’s own graphene research.

“There won’t be anything in the world this comprehensive,” says Rotenberg. “We’ll be able to grow anything and look at non-homogeneous samples in amazing detail.”

Rotenberg also sees the renovated Beamline 7 (modeled at right) fitting in really well with the Lab’s new mesoscale science initiative because it will offer the spatial resolution necessary to study emerging phenomenon.

“We know a lot about what electrons and materials do at the atomic scale and large scale,” says Rotenberg. “This would be the first time that we’d be able to look at complex materials at the medium scale and understand what’s happening.”

If everything falls into place as planned, Rotenberg says the ALS should see the first light down the new Beamline 7 this summer, and light to the endstations in the fall. See some photos of Sector 7 upgrade on the Shutdown 2013 Update page.

February 2013 Print

Steve Kevan, ALS Deputy Division Director for Science


kevan ring leaderALS Deputy Division Director of Science Steve Kevan has a long and collaborative history with the ALS – he’s been involved with the facility since its planning stages, is a veteran user, a longtime member of the ALS Scientific Advisory Council, and was the first chair of the Users' Executive Committee.

It’s fitting then that Kevan joined the ALS in July shortly before our historically significant 20th anniversary. He brings insights drawn from his many years working with the ALS, his experience as a professor of physics at University of Oregon since 1986, and his own research, which is focused on undulator radiation. Kevan worked on the team that built the first beamline at the ALS and led the construction of Beamline 12.0.2 in 2001, which was a first step toward a dedicated and flexible coherent soft x-ray scattering and imaging beamline and has led to the construction of the COSMIC beamline.

In his new role at the ALS, one of Kevan’s primary directives has been to explore career development opportunities for beamline scientists and graduate students. Kevan says he started looking into professional development for scientists even before he joined the ALS – he describes it as an area that’s difficult to define at a facility devoted to serving users.

“As the ALS approaches middle age, many of our beamline scientists are approaching middle age as well,” says Kevan. “We need to make sure we are fostering an entrepreneurial, collaborative approach that serves them well.”

Kevan sees the ALS scientists as an integral part of the user experience. “We offer tools, but our beamline scientists are the experts in using those tools,” he says. “People need help using our tools and analyzing data, and our people are the keys to providing that service.”

Kevan is also focusing his initial efforts on building collaboration and community among scientific staff. At the urging of senior scientist Elke Arenholz, Kevan has created collaborative groups of beamline scientists organized by interest areas rather than management structure. Many of the scientists in these groups came together recently for a brainstorming workshop to discuss how the ALS might contribute to the DOE’s recent mesoscale research initiative.

“I’ve already seen beamline scientists discovering through these groups that some of their colleagues were doing things that they didn’t know about but found interesting,” Kevan says.

This collaborative approach focused on research areas will guide some of Kevan’s other big-picture projects this year as well. Most immediately, he’s working on the ALS strategic plan, which he’s organizing by scientific subject areas that will align with internal “cross-cut” reviews, which are focused on subject areas rather than beamlines. Kevan hopes to have cross-cut reviews for each subject area every three years.

“Our goal is to be a ‘collaboratory,’ not just a user facility,” says Kevan. “We want to help people solve problems, use our facility better, make progress, and collaborate with them.”

January 2013 Print

Doug Taube, ALS Chemical Safety Specialist


As a chemical safety specialist, Doug Taube oversees chemical safety and experiment review for both ALS scientists and users. A natural result of his job description is his broad knowledge of all the techniques and experiments taking place around the experiment floor. Because of this and his affable and enthusiastic demeanor, Taube has become a go-to ALS tour guide. It’s a role he enjoys and views as an opportunity to enlighten others about the amazing and important scientific research underway here.

Taube, who holds a PhD in chemistry and worked as a catalyst chemist for ten years, joined the ranks of the ALS two and a half years ago. He estimates he’s given more than 150 tours since then, with groups ranging from distinguished guests from the Office of the UC President to fifth graders. He enjoys them all, but says that the best tours are really those with people who engage with him. “Regardless of their knowledge, it’s more interesting when there’s some give and take,” says Taube.

When he’s not entertaining tour groups with ALS history quizzes and accelerator science trivia, Taube is busy ensuring experiment safety at the ALS. The signs posted around the facility that inform users wondering about experimental procedure: “Better Call Doug!” pretty much say it all. Before users can access the ALS User Chemistry Labs or proceed with experiments on the beamline floor, they need Doug’s approval.

“I get the rare treat of visiting with just about every user who comes through the ALS. I make sure they’re doing their experiment safely then I get to ask them the big-picture questions about why they are doing their work” says Taube.

Taube earned his PhD in inorganic chemistry at UC Santa Barbara and then spent three and a half years at UC San Diego doing post-doc work before moving into industry. He worked as a catalyst chemist for ten years and another ten years in safety at Catalytica in Mountain View before coming to the ALS. Taube also taught freshman chemistry at Cal State Hayward for several years. His broad background has given him the ability to appreciate the many types of scientific research at the ALS, and to explain and elaborate upon it for his tour groups.

November 2012 Print

Steve Rossi, Project and Facility Management


rossiAround this time of year, Steve Rossi, project and facility management group leader at ALS, shifts his focus to shutdown mode. Preparation and planning for the weeks that the ALS is out of commission is a huge part of Rossi’s job. While much of this is invisible to users, all of it is absolutely essential to the maintenance and growth of the ALS.

“This is a pivotal shutdown,” says Rossi. “We have many multi-year projects that are finally coming to fruition.”

The ALS shutdown is scheduled for February 4 through April 8, 2013, which is slightly longer than usual to accommodate this year’s to-do list. Rossi’s list includes work on the ALS controls upgrade, sextupole magnet installations, MAESTRO front-end and beamline installation, an RF power supply upgrade and replacement of the storage ring bend magnet power supply.

“At the ALS we’re always chasing an increase in performance and reliability,” says Rossi. “And shutdown is when we work towards reaching those goals.”

The RF upgrade, a $4.8 million project, and the controls upgrade, a $7.6 million project, have been many years in the planning stage, says Rossi. The work on these two projects will largely be transparent to users, but they are essential to the future of the ALS – the controls upgrade will update and replace an aging controls system and the RF upgrade will give the ALS vastly improved backup capabilities in addition to the ability to provide more RF power to the storage ring.

“We’re doing our job right if users never notice the work we’ve done,” says Rossi, “because that means we’re identifying our vulnerabilities and investing in them before our users see them.”

This forward-looking viewpoint is what much of Rossi’s work is based on. He describes his position as “an inch deep and a mile wide,” which is apt when taking into consideration what he’s responsible for – the overall project portfolio of the ALS and the oversight and coordination of maintenance and facility projects. As such, Rossi often serves as a bridge between operations and technical staff – coordinating projects and the players involved in carrying them through to fruition. He describes his management philosophy as “not looking into the past, but projecting into the future.”

October 2012 Print

Elke Arenholz, Senior Scientist, Scientific Support Group


arenholzSenior scientist Elke Arenholz has seen a lot of changes at Beamlines 4.0.2 and 6.3.1 since she arrived at the ALS in 2000, but what brought her here initially is still what keeps her passionate about her work – designing new instrumentation and working with the user community to optimize research capabilities.

Arenholz’s first big project at the ALS ended up becoming her “claim to fame” – an eight-pole electromagnet that provides magnetic fields up to 0.8 T in arbitrary directions relative to the incoming x-ray beam.

“It was really exciting to build and it had a huge impact right away because we were able to use it characterize materials in a way that no one had before,” says Arenholz. “It was the first device installed at a synchrotron that could apply the magnetic field in any direction, instead of just having it parallel to the x ray beam.”

Arenholz has continued with this theme ever since, always asking: “How can we extract some new information?” Typically, the answer involves working with engineering to create a new experimental configuration.

“I want to understand very fundamentally the interaction of x-rays with magnetic materials, and to do that I build new systems that people haven’t used before,” says Arenholz. “It’s a lot of fun, and we are really lucky to have a wonderful engineering department here at the Lab with lots of experts.”

In 2011, her group, which includes Beamline Scientists Catherine Jenkins and Padraic Shafer, completed work on a first-of-its-kind, ARRA-funded superconducting vector magnet. The magnet, which is a superconducting version of Arenholz’s eight-pole electromagnet, provides fields up to 5 T in arbitrary directions.

Arenholz has focused on spectroscopy for much of her career, but she has recently turned her attention to scattering—studying x ray diffraction patterns from periodic structures on the nanoscale. Once again, this shift required building a new endstation. The LDRD-funded system that was installed at Beamline 4.0.2 last fall uses a superconducting disc of 0.8” diameter to generate 4T at the sample while still allowing maximum flexibility for the scattering geometry.

While Arenholz enjoys her own research and the continual process of advancing beamline and endstation capabilities, she also finds her interactions with users at the beamline very rewarding. She describes her work life as consisting of two experiments: the scientific ones and the anthropological experiment of working with users.

“There’s a lot of teaching involved,” says Arenholz. “I am constantly thinking ‘How can I explain things better to users and make the system operation easier so that they make the best use of the experimental capabilities and beamtime?’”

In addition to her work at the ALS, Arenholz is an academic editor for AIP Advances, on the editorial board of the Journal of Magnetism and Magnetic Materials (JMMM), and program co-chair for the 2013 Joint MMM/Intermag Conference.

September 2012 Print

David Shuh, Senior Scientist, Chemical Sciences Division


09-2012-ring leader shuhFor the past decade, David Shuh has led one of the most in-demand beamlines at the ALS. In addition to his position as a Senior Scientist in Berkeley Lab’s Chemical Sciences Division (CSD), Shuh is Project Leader at ALS Beamline 11.0.2 , the Molecular Environmental Sciences (MES) Beamline, a leading national resource in the field of soft x-ray synchrotron radiation research. Research at the MES Beamline has provided some of the first significant molecular-level understandings of important chemical and physical processes taking place at interfaces under real or more realistic conditions than ever before possible.

Run by the LBNL CSD in partnership with the ALS, Shuh credits the MES Beamline’s popularity and success to multiple factors, a primary one being its initiation with a strong, innovative, and sufficiently developed scientific program proposed by the initial core research team members (Hendrik Bluhm-CSD, Mary K. Gilles-CSD, and Tolek Tyliszczak-ALS). Secondly, the needs of the scientific programs were expertly translated into a revolutionary general-purpose beamline operating from 75 eV to about 2100 eV downstream of an elliptical polarization undulator (EPU) and flagship endstations. The beamline construction team was led by Tony Warwick and they did a fabulous job including the development of a fantastic monochromator.

“The contributions and dedication of the core research team and the scientists at the MES Beamline have been key to the development of scientific programs, endstations, support of general users, and general user scientific programs,” says Shuh.

Shuh also notes that it was the strong and unwavering support of the U. S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, through the Divisions of Materials Science and Chemical Sciences, Geosciences, and Biosciences, that enabled the construction of the MES Beamline.

“The strong operational support provided early on from of the DOE’s Division of Chemical Sciences, Geosciences, and Biosciences served as a solid foundation for all the developments that have followed at the MES Beamline,” says Shuh. “And the partnership and support we’ve received from the ALS has also been key to our success.”

The MES Beamline Scanning Transmission X-Ray Microscope (STXM) endstation is a top worldwide resource for a diverse set of scientific investigations utilizing soft x-ray STXM. The endstation pair – the MES Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS) endstations are leaders in surface studies of interfaces at pressures approaching 10 Torr for a wide range of energy research. Shuh notes that several other synchrotron radiation facilities have built similar beamlines and endstations, adding that “imitation is the highest form of flattery.”

The MES research team’s significant scientific diversity and history has also been a major contributor to the success of the beamline, says Shuh. Physicists Tolek Tyliszczak and Hendrik Bluhm, as well as chemist Mary K. Gilles, were all involved early on in the MES Beamline effort.

“The scientific diversity of the staff, their expertise, dedication, and years of experience are invaluable to the wide range of users at the MES Beamline and in general to the ALS as well,” says Shuh.

The MES Beamline scientists have been recognized over the years for their development of beamline endstation instrumentation. Tolek Tyliszczak has been awarded two ALS Klaus Halbach Awards for Innovative Instrumentation as part of two teams for STXM developments in 2002 and 2010. Similarly, Hendrik Bluhm was part of a team awarded a Halbach Award in 2004 and an R&D 100 Award in 2010 for the development of ambient pressure photoelectron spectroscopy.

Shuh and the MES team have seen many accomplishments over the years at the MES Beamline – he notes that they’ve had a tremendous impact in magnetic dynamics, the development and use of in-situ reaction cells for science in the soft x-ray regime, environmental science, and a significant impact on realistic catalysis and interfacial science across the board.

In addition to his role at the MES Beamline, Shuh is the Director of the Glenn T. Seaborg Center and is a co-lead on the Berkeley Lab Critical Materials Initiative. Shuh, along with Frances Houle (CSD), will work toward reducing current shortages and preventing future shortages through advances in nanoscience, chemistry, materials science, computation and theory, physics, materials genomics, and energy analysis techniques. The project will make use of Department of Energy national user facilities located throughout the country.

August 2012 Print

Mike Martin, Infrared Beamlines Leader and Deputy Group Leader, Scientific Support Group


I have been at the ALS for 15 years now, and continue to enjoy being a part of this dynamic and always interesting facility. My main job continues to be the primary Beamline Scientist for the ALS infrared beamlines (BL 1.4 and BL 5.4). Together with Hans Bechtel, we help a diverse array of scientists perform FTIR spectromicrsocopy on their samples. We continue to push the boundaries of the science that synchrotron infrared beamlines can enable, recently exploring two new directions. Taking spectral imaging into the third dimension, we are developing FTIR spectral microtomography, and on the nano scale, well sub-diffraction limited probing via scattering the light off an AFM tip.

I wear a number of other hats around the ALS and Berkeley Lab. I am proud to be a Deputy Group Leader for the ALS Scientific Support Group (SSG) under Zahid Hussain. The SSG's primary mission is to support the efforts of researchers at the ALS through scientific and technical collaboration and scientific outreach. We run and develop many of the ALS beamlines, organize a variety of seminars, help grow the pool of future synchrotron scientists via the ALS Doctoral and Post-Doctoral Fellowship programs, and pioneer many technical developments. The SSG plays an important role in keeping ALS science ahead of the game and maintaining the ALS as an outstanding national user facility.

I participate actively in several safety efforts for the ALS division and the Lab. I am the current chair of the ALS Staff Safety Committee which helps write safety policies by investigating whenever an incident provides opportunities to learn, and making sure that the division follows through with effective corrective actions. I also co-chair the ALS Beamline Review Committee which ensures beamlines are designed, built, and maintained for safety as well as technical excellence. I am the ALS representative on the LBNL Safety Advisory Committee and am also a member of the LBNL Institutional Biosafety Committee. I have recently been working on a Lab-wide effort to recognize and enhance our safety culture, and if you're a Berkeley Lab staff member you'll soon hear more about how "Safety is Elemental."

For the broader synchrotron community, I will soon be taking over as US Editor for Synchrotron Radiation News starting with Volume 26. SRN provides review articles on specific areas of synchrotron research, project updates of new light sources, meeting reports, and a new product section. I am looking forward to working with many of you in keeping this publication a widely read and useful journal for the synchrotron community! I welcome your suggestions and comments ( This e-mail address is being protected from spambots. You need JavaScript enabled to view it ).

July 2012 Print

Musa Ahmed, Senior Scientist, Chemical Dynamics Beamline


musa ahmedAt more than 17 years old, the Chemical Dynamics Beamline (ALS Beamline 9.0.2) is one of the oldest beamlines at the ALS. Over those years, the scientific thrusts at the beamline have evolved from performing state-of-the-art reaction dynamics studies to probing and understanding the physical and chemical principles that govern complicated phenomena in nature. Strongly coupled with this interest is a realization that research should be guided by the grand scientific challenges of the 21st century. Gaining a molecular level understanding of alternative carbon neutral energy sources and how to mitigate the effects of global climate change are themes that currently drive a number of users and beamline staff.

The beamline has four terminals—two with monochromators—which deliver vacuum ultraviolet light in the range of 7.4-25 eV. A number of endstations, all configured with mass spectrometers, measure and quantify processes which are relevant to a broad range of fields, particularly combustion and aerosol science, electronic structure of radicals, molecules and clusters in the gas phase and analysis of complicated systems, such as bacterial biofilms, atmospheric aerosols, fossil feathers and soil. Four of the endstations dedicated to molecular beams, aerosol studies, low-temperature reaction studies and imaging mass spectrometry are in-house facilities. Two "roll-up" endstations come from the Sandia Livermore combustion research facility where flame chemists and reaction kineticists probe complex molecules in exquisite detail and discover species never seen before using synchrotron radiation (see ALS Science Highlight "Direct Kinetic Measurements of a Criegee Intermediate"-ed.) . The home team, comprising students, post-docs and scientists discover the “glassy” nature of an organic aerosol, decipher the transfer of protons in the absence of hydrogen bonds (see this month's highlight,  "A Surprising Path for Proton Transfer Without Hydrogen Bonds"-ed.) , and use lasers to blow sand and graphite up  to get them into the gas-phase. In collaboration with outside users, the origin of the solar system is elucidated, the effects of cigarette smoke on walls quantified, and the nature of formation of organic molecules in distant Titan explained. Theoretical chemists can be seen working the owl shift, seeking to understand what happens when molecules relevant to biofuel production are heated to 1300 Celsius. Evolutionary biologists, paleontologists, environmental geochemists, and life science type folks have put 47-million-years-old bird feathers, dirt, pieces of wood, grass and leaves, and scum floating on top of a pond into the beautiful imaging mass spectrometer located right by the experimental walkway. Sometimes an old biodiesel running Mercedes can be seen in the parking lot outside, belching its exhaust into the synchrotron for study, and that is what the chemical dynamics beamline is all about. Seventeen years old and marching boldly on.

For more information about Musa and his team, and their research, visit the Beamline 9.0.2 Web site.

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