Berkeley Lab


Berkeley Lab Part of a Team Revisiting ‘Cold Fusion’ Results

— Researchers didn’t find a new source of fusion energy, but they do see value in pursuing unexplored paths in fusion research

After an article by Glenn Roberts, Jr., Berkeley Lab Strategic Communications

The pulsed plasma setup being used to study light ion fusion processes at relatively low energies. Photo by Marilyn Chung, Berkeley Lab.

A multidisciplinary research team came together in 2015 to revisit old experiments and hunt for anomalies in low-energy nuclear reactions that could point toward a new source of energy. While they did not discover a limitless source of energy, their work — detailed in a May 27 Perspective article in the journal Nature — does open a new channel for fusion research.

Berkeley Lab was invited to join this study group in 2016 based on its researchers’ decades of expertise in fusion R&D, particle accelerators, and nuclear diagnostics.


Berkeley Lab Research Slam Participant Registration Open; Enter by May 31

What are you doing in your research and why is that exciting and important? You have three minutes.* Go!

*For the first-place winner, that’s a thousand dollars a minute… not bad for having fun and building a career skill.

Early-career scientists and postdocs are invited to participate in the Berkeley Lab Research Slam. Modeled after poetry and storytelling “slams” (and the research-focused UC-Berkeley Grad Slam), the competition gives you three minutes to convey what’s exciting and important about your work. It’s more than just fun — engaging and efficient public speaking about your work is a skill that will pay dividends throughout your career (imagine an “elevator speech” to a prospective sponsor, for instance). And speaking of funding, the winner takes home $3,000, with runner-up and People’s Choice awards as well.

Those who are in an active appointment through October 2019 and received their PhD between January 2012 and December 2018 are eligible. To learn more and get started, visit the Berkeley Lab Research Slam website. The deadline for registering to participate is May 31, followed by a deadline for a short video that will be used to pick the 12 finalists. September 19 is the big day!

APRIL 2019

Director’s Corner

Computer simulation has revolutionized the way everything is designed, including particle accelerators. Through advanced simulation, one can optimize performance in a complicated parameter space, identify and avoid potential problems, and even make new discoveries. Berkeley Lab has an ideal combination of resources for this challenging task, with the subject-matter expertise of our Accelerator Modeling Program and its network of collaborators, together with the algorithmic and coding expertise of the Computing Sciences Area and the processing power of NERSC, as exemplified by this issue’s science highlight.

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ATAP also recently organized and hosted the inaugural Workshop on Instrumentation and Diagnostics for Superconducting Magnets (IDSM01), bringing together some 35 of the world’s leading experts on this key aspect of designing and building the magnets of tomorrow’s accelerators. Superconducting magnets have historically been a strength of ATAP and our Engineering Division partners in the Berkeley Center for Magnet Technology. We are pleased and honored by the magnet community’s response to this opportunity; together we can push forward to the next generation of more powerful, reliable, and cost-effective magnets, to the benefit of all.

Outreach to the next generation of STEM professionals and informed citizens is another ATAP priority. The annual Nuclear Science Day for Scouts, as well as Daughters and Sons to Work Day, recently brought many young people to Berkeley Lab to get to know what we do. Two more opportunities to get involved are coming up soon through the Oakland Unified School District: Science Fair, where Berkeley Lab has an ever-popular booth, and the Dinner with a Scientist event.

All that we do, we are committed to doing safely and with respect for the environment. In that spirit, we held our annual Safety Day, joined by two organizations with close ties to ATAP: the Engineering Division and the ALS-Upgrade Project. We are tracking longer-term action items to completion as we accelerate into another year of science with all the benefits of tidy and organized workspaces.


—New simulation tool brings advanced scalability to ultra-high-intensity physics simulations
From an article by Kathy Kincade, Berkeley Lab Computing Sciences

Large-scale simulations demonstrate that chaos is responsible for stochastic heating of dense plasma by intense laser energy. This image shows a snapshot of electron distribution phase space (position/momentum) from the dense plasma taken from PIC simulations, illustrating the so-called “stretching and folding” mechanism responsible for the emergence of chaos in physical systems. Image: G. Blaclard, CEA Saclay

A new 3D particle-in-cell (PIC) simulation tool developed by researchers from Lawrence Berkeley National Laboratory and CEA Saclay is enabling cutting-edge simulations of laser/plasma coupling mechanisms that were previously out of reach of standard PIC codes used in plasma research. More detailed understanding of these mechanisms is critical to the development of ultra-compact particle accelerators and light sources that could solve long-standing challenges in medicine, industry, and fundamental science more efficiently and cost-effectively.

In laser-plasma experiments such as those at the Berkeley Lab Laser Accelerator (BELLA) Center and at CEA Saclay — an international research facility in France that is part of the French Atomic Energy Commission — very large electric fields within plasmas accelerate particle beams to high energies over much shorter distances when compared to existing accelerator technologies. Supercomputer simulations have become increasingly critical to this research, and Berkeley Lab’s National Energy Research Scientific Computing Center (NERSC) has become an important resource in this effort.

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The long-term goal of these laser-plasma accelerators (LPAs) is to one day build colliders for high-energy research, but many spinoffs are being developed already. For instance, LPAs can quickly deposit large amounts of energy into solid materials, creating dense plasmas and subjecting this matter to extreme temperatures and pressure. They also hold the potential for driving free-electron lasers that generate light pulses lasting just attoseconds. Such extremely short pulses could enable researchers to observe the interactions of molecules, atoms, and even subatomic particles on extremely short timescales.

Supercomputer simulations have become increasingly critical to this research, and Berkeley Lab’s National Energy Research Scientific Computing Center (NERSC) has become an important resource in this effort. By giving researchers access to physical observables such as particle orbits and radiated fields that are hard to get in experiments at extremely small time and length scales, PIC simulations have played a major role in understanding, modeling, and guiding high-intensity physics experiments. But a lack of PIC codes that have enough computational accuracy to model laser-matter interaction at ultra-high intensities has hindered the development of novel particle and light sources produced by this interaction.

This challenge led the Berkeley Lab/CEA Saclay team to develop their new simulation tool, dubbed Warp+PXR, an effort started during the first round of the NERSC Exascale Science Applications Program (NESAP). The code combines the widely used 3D PIC code Warp with the high-performance library PICSAR co-developed by Berkeley Lab and CEA Saclay. It also leverages a new type of massively parallel pseudo-spectral solver co-developed by Berkeley Lab and CEA Saclay that dramatically improves the accuracy of the simulations compared to the solvers typically used in plasma research.

In fact, without this new, highly scalable solver, “the simulations we are now doing would not be possible,” said Jean-Luc Vay, a senior physicist at Berkeley Lab who heads the Accelerator Modeling Program in the Lab’s Applied Physics and Accelerator Technologies Division. “As our team showed in a previous study, this new FFT spectral solver enables much higher precision than can be done with finite difference time domain (FDTD) solvers, so we were able to reach some parameter spaces that would not have been accessible with standard FDTD solvers.” This new solver is also at the heart of the next-generation PIC algorithm with adaptive mesh refinement that Vay and colleagues are developing in the new Warp-X code as part of the U.S. Department of Energy’s Exascale Computing Project.

2D and 3D Simulations Both Critical

Vay is also co-author on a paper published March 21 in Physical Review X that reports on the first comprehensive study of the laser-plasma coupling mechanisms using Warp+PXR. That study combined state-of-the-art experimental measurements conducted on the UHI100 laser facility at CEA Saclay with cutting-edge 2D and 3D simulations run on the Cori supercomputer at NERSC and the Mira and Theta systems at the Argonne Leadership Computing Facility at Argonne National Laboratory. These simulations enabled the team to better understand the coupling mechanisms between the ultra-intense laser light and the dense plasma it created, providing new insights into how to optimize ultra-compact particle and light sources. Benchmarks with Warp+PXR showed that the code is scalable on up to 400,000 cores on Cori and 800,000 cores on Mira and can speed up the time to solution by as much as three orders of magnitude on problems related to ultra-high-intensity physics experiments.

“We cannot consistently repeat or reproduce what happened in the experiment with 2D simulations – we need 3D for this,” said co-author Henri Vincenti, a scientist in the high-intensity physics group at CEA Saclay. Vincenti led the theoretical/simulation work for the new study and was a Marie Curie postdoctoral fellow at Berkeley Lab in Vay’s group, where he first started working on the new code and solver. “The 3D simulations were also really important to be able to benchmark the accuracy brought by the new code against experiments.”

For the experiment outlined in the Physical Review X paper, the CEA Saclay researchers used a high-power (100TW) femtosecond laser beam at CEA’s UHI100 facility focused on a silica target to create a dense plasma. In addition, two diagnostics – a Lanex scintillating screen and an extreme-ultraviolet spectrometer– were applied to study the laser-plasma interaction during the experiment. The diagnostic tools presented additional challenges when it came to studying time and length scales while the experiment was running, again making the simulations critical to the researchers’ findings.

“Often in this kind of experiment you cannot access the time and length scales involved, especially because in the experiments you have a very intense laser field on your target, so you can’t put any diagnostic close to the target,” said Fabien Quéré, a research scientist who leads the experimental program at CEA and is a co-author of the PRX paper. “In this sort of experiment we are looking at things emitted by the target that is far away – 10, 20 cm – and happening in real time, essentially, while the physics are on the micron or submicron scale and subfemtosecond scale in time. So we need the simulations to decipher what is going on in the experiment.”

“The first-principles simulations we used for this research gave us access to the complex dynamics of the laser field interaction, with the solid target at the level of detail of individual particle orbits, allowing us to better understand what was happening in the experiment,” Vincenti added.

These very large simulations with an ultrahigh precision spectral FFT solver were possible thanks to a paradigm shift introduced in 2013 by Vay and collaborators. In a study published in the Journal of Computational Physics, they observed that, when solving the time-dependent Maxwell’s equations, the standard FFT parallelization method (which is global and requires communications between processors across the entire simulation domain) could be replaced with a domain decomposition with local FFTs and communications limited to neighboring processors. In addition to enabling much more favorable strong and weak scaling across a large number of computer nodes, the new method is also more energy efficient because it reduces communications.

“With standard FFT algorithms you need to do communications across the entire machine,” Vay said. “But the new spectral FFT solver enables savings in both computer time and energy, which is a big deal for the new supercomputing architectures being introduced.”

Other members of the team involved in the latest study and co-authors on the new PRX paper include: Maxence Thévenet, a post-doctoral researcher whose input was also important in helping to explain the experiment’s findings; Guillaume Blaclard, a Berkeley Lab affiliate who is working on his Ph.D. at CEA Saclay and performed many of the simulations that were reported in this work; Pr. Guy Bonnaud, a CEA senior scientist whose input was important in the understanding of simulation results; and CEA scientists Ludovic Chopineau, Adrien Leblanc, Adrien Denoeud, and Philippe Martin who designed and performed the very challenging experiment on UHI100 under the supervision of Fabien Quéré.


A superconducting accelerator magnet is a heavily constructed and tightly encased thing, figuratively and literally opaque, but internal details matter a great deal. As physicists and engineers strive to push both the performance and the cost-effectiveness of these magnets beyond the present state of the art, they are finding ingenious ways to do things like identifying and locating the precursors of a “quench” (sudden local loss of superconductivity) and minimizing the “training” or break-in process. A broad effort in developing novel techniques for magnet diagnostics is geared towards solving long-standing problems such as training, determining quench origins, and identifying quench-driving factors.

Some 35 leading experts in the field, representing 4 US national laboratories and other research institutions, three of their international counterparts, two universities, and a private-sector developer of superconductor, came to Berkeley Lab April 24-26 for the first Workshop on Instrumentation and Diagnostics for Superconducting Magnets (IDSM01). The workshop was aimed at defining a common strategy for diagnostics and establishing a platform for exchanging and circulating new ideas. The results of this ongoing dialogue are expected to benefit not only accelerator-based efforts in high energy and nuclear physics, but other uses of superconducting magnets as well, including the quest to harness fusion energy.

Team picture

IDSM01 participants enjoy a bit of California springtime after two and a half days of discussions. Click for full-size, print-resolution version.


Make a Difference in a Future Colleague’s Life

For an investment of just one or two evenings, you can help the Oakland Unified School District make a difference in STEM education by volunteering for the district-wide Science Fair or their Dinner with a Scientist event.

OUSD Science Fair, 6-8 pm Wednesday, May 8

Exploring the hidden secrets of “plain” white light with diffraction gratings is a perennial favorite activity at Berkeley Lab’s OUSD Science Fair booth.

ATAP’s Outreach and Education Coordinator Ina Reichel invites you to join her at the Berkeley Lab booth. You’ll help with activities that center around the electromagnetic spectrum, giving students a chance to practice making and describing observations (which is second nature to us but an important supplement to classroom activities in a budding scientist’s education). You’ll also get a chance to visit your future colleagues’ science projects. It only takes five minutes of on-the-job training to lead these hands-on activities. If you would like to join in the fun, please contact Ina (x4341,

Dinner with a Scientist: 5-8 pm Monday, May 20 or Tuesday, May 21
An OUSD tradition since 2009, Dinner with a Scientist brings teachers and students together with researchers, university professors, engineers, doctors, veterinarians, and even forensic scientists. You’ll talk about your work, lead an activity, and answer questions, switching tables every 30 minutes (with enough time for you to enjoy your free dinner). The district will host two Dinner with a Scientist events this year: May 20 and 21. Both events run 5-8 p.m. at Chabot Space & Science Center. To learn more or sign up, visit the OUSD Science Events website.

Nuclear Science Day for Scouts

In a Berkeley Lab outreach tradition now in its ninth year, the Nuclear Science Division hosted a Nuclear Science Day for Scouts in Saturday, March 30. Some 180 Scouts from across California (one troop came all the way from Irvine) visited the Lab to learn about nuclear science (including related career possibilities) to fulfill one of the requirements for a merit badge.

Particle accelerators, with their ongoing rich heritage of contributions to our knowledge of the atom, nucleus, and subatomic particles, are regarded as nuclear facilities for merit-badge purposes, and the Advanced Light Source was the focus of many of their experiences. Among the things they learned about were ALS-U, an upcoming major upgrade of the Advanced Light Source; ATAP plays key roles in this transformative reworking of a flagship user facility.

Nuclear Science Day for Scouts would not be possible without numerous volunteers from across the Lab. ATAP staff members Qing Ji and Pat Thomas chaperoned groups of 30 scouts from activity to activity, Warren Byrne led two ALS tours, while Ina Reichel coordinated the ALS tours and directed traffic in the ALS lobby all day. Former ATAP staffers Jose Alonso and Tony Young, still active in retirement and now affiliated with the Physics Division and the ALS, respectively, were also among the 55 people who did a good turn that day by reaching out to the scientists of tomorrow.


Stay in the Know with “Elements,” Berkeley Lab’s New Communication Platform

With nearly 4000 employees and one of the most diverse R&D portfolios anywhere, keeping up with Berkeley Lab can take some doing. Elements, the Lab’s new communication platform, makes it easier by letting you tailor your news feed to your interests, receive urgent communications on your mobile devices, and interact rather than just read. Whatever topics matter most to you, from accelerators to zero-emissions commuting options, find out what’s important by signing up for Elements.

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ATAP and Engineering Safety Day Was a Sweeping Success

On Thursday, March 28, 2019, the ATAP and Engineering Divisions and the ALS-U project held their annual Safety Day, performing cleanup and taking care of problems that could be settled immediately within our capabilities. During the cleanup and the subsequent QUEST assessments and management walkthroughs, action items that required more time and resources or professional skills were tabulated.

With 17 QUEST teams and 12 management-walk around teams reporting in thus far, we have identified 226 action items, which will be formally tracked to resolution. The most common were seismic (77), electrical (26), and signage (21).

The cleanup generated approximately
14 bins of e-waste
11 bins of paper and cardboard
4 bins of scrap metal
4 machine carts, 1 pallet, and 1 bin of surplus equipment
3 bins of trash
5 chairs, 1 desk, 1 refrigerator, 1 microwave, and 1 space heater
and the best statistic of all — a testament to staying within our training and physical capabilities and using appropriate personal protective equipment:
0 injuries

Watch the next issue of this newsletter or visit the Safety Day 2019 page on the ATAP website for big news still to come: honors for individual and QUEST-team excellence on Safety Day.


Director’s Corner

Dear friends and colleagues,

In my first Director’s Corner, I’d like to take the opportunity for a few words about who I am and how I came to be here. My 18 years with Berkeley Lab and ATAP, starting as a research scientist working on front-end systems for the SNS, through service as head of the Fusion Science & Ion Beam Technology Program and as Division Deputy for Technology, provided an excellent vantage point for learning about ATAP and our partner divisions. I am excited by the opportunity to build on our success patterns and add to our history of achievement in this transition time.

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I earned my degrees at Goethe University in Frankfurt, Germany, doing my graduate research at Lawrence Livermore National Laboratory on ion-solids interactions. In a postdoctoral fellowship there, I researched ultrafast (~10 fs) electronic excitation of solids, nanostructuring (“nano” was new then), and materials analysis. In 2000, I came to Berkeley Lab to work on the “front-end system” that the Accelerator and Fusion Research Division (now known as ATAP) was developing for the Spallation Neutron Source being built at Oak Ridge. Here is a link to my CV for those interested in the details.

During those days I also began work on the hardware foundations of quantum computing, exploring spin qubit ideas — work that continues, and is now aligned with a burgeoning Labwide emphasis on quantum information systems. (To learn more about this, see the related article, and visit the Berkeley Quantum website.) My other research interests include materials far from equilibrium (as studied, for example, with intense ion beam pulses and plasmas) and novel accelerator concepts (such as MEMS-based multi-beam accelerators).

Later years brought opportunities to lead the Ion Beam Technology Group, then to serve as head of the Fusion Science and Ion Beam Technology Program. Throughout my time at the Lab I have been fortunate to be able to work with many colleagues in ATAP and our partners in the Engineering Division as well as with colleagues across the Lab.

The generation and ensuing acceleration of ion beams is one of the central legacies of the Division’s (and Berkeley Lab’s) origins. Driving advanced accelerator concepts (most notably based on laser-plasma acceleration in the BELLA Center) and the development and application of ion sources, compact accelerators and low-energy accelerator “front ends” has continued to be an area of excellence for us.

I have always been attracted to the idea of the scientist as a maverick who likes to learn and try new things. And I have learned that innovation and creativity can be balanced with long term vision and the discipline to complete things.

Teaching a graduate course on Accelerators and Beam Physics in UC-Berkeley’s Nuclear Engineering Department last Spring, together with Carl Schroeder, proved to be a lot more fun then I had expected (all these slides to prepare…) and I see a really wonderful opportunity here to foster and grow our longstanding connection with new joint projects and students from campus who work with us.

As is required for cutting-edge work in accelerators, we are very good at many different things, and what’s more, we talk to each other. Cross-pollination among our specialty areas is something that benefits both our own endeavors and our many collaborations (across the lab, with campus, nationally and internationally). As interim director, I look forward to finding new ways to foster this success pattern.

“In the search for an interim director, we were looking for someone who exemplified Berkeley Lab’s approach to team science and appreciated the whole of the accelerator field. Thomas brings a rigorous technical knowledge that is broad as well as deep, and a history of collaborative work with enthusiasm for disruptive ideas.”
—ALD for Physical Sciences James Symons

In ATAP, we are laying the scientific foundations of future particle accelerators. These accelerators can make the difference in advancing our understanding of the most fundamental aspects of matter and energy in the universe and they enable exciting new applications.

In ATAP, theory, modeling and simulations iterate swiftly with experiments to drive advanced accelerator concepts. We are leading the world in mastery of laser-driven plasmas that accelerate electrons to record energies at the BELLA Center. We are developing near-term, high-impact applications of laser-plasma accelerators in areas ranging from radiography to medicine. Coherent combining of fiber laser pulses might be the ticket to reaching high average power with short pulse lasers. Ultrafast electron diffraction at MHz repetition rates (HiRES) now enables collaborative users to track the multi-scale structural evolution of materials. ATAP plays key accelerator physics and technology roles in the ALS-U project, the upgrade of Berkeley Lab’s Advanced Light Source that will serve thousands of users for years to come. We are pushing the envelope in magnet development to reach higher fields with new materials and are leading the US Magnet Development Program. We use lasers, plasmas and beams to drive materials and matter far from and study novel properties under these extreme conditions — now with users and collaborators as part of LaserNetUS (see article below). We apply beams of neutrons to image carbon in soil. We develop multi-beam ion accelerators based on MEMS that might enable massive scaling of beam power in a table top setup. We use and develop machine-learning techniques to advance accelerator science, and we have connected to the new wave of Quantum Information Science with precision control techniques and new ideas on spins and photons for quantum sensing and communication.

Throughout our diverse endeavors in accelerator technology and applied physics, a key to our success is the ability to integrate our capabilities in theory, modeling and simulation, and fabrication and operation of facilities. Supporting all this, we are fortunate to have strong and dedicated technical-support and business-operations teams so we can work efficiently and safely.

I very much look forward to this opportunity. I am excited about working with you, supporting ongoing programs, and helping to develop the seeds of new ideas into new and thriving R&D directions.

BELLA Center Sets New Laser-Plasma Accelerator Electron Energy Record

Computer visualization of acceleration; see linked article for detailsBy accelerating electrons to an energy of 7.8 GeV in just tens of centimeters, BELLA Center researchers have nearly doubled their own previous record for laser-driven particle acceleration, set in 2014 at 4.2 GeV. To learn more about this achievement and the techniques that made it possible, visit the news release from Berkeley Lab Strategic Communications or read the technical article in the journal Physical Review Letters.

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Meet the New Leaders of BELLA Center

ATAP Interim Director Thomas Schenkel has named a leadership team for the Berkeley Lab Laser Accelerator Center (BELLA). Eric Esarey is the new Center Director, aided by Deputy Directors Cameron Geddes and Carl Schroeder.

All three are experienced BELLA Center research leaders, hold the rank of Senior Scientist, and are Fellows of the American Physical Society (Esarey since 1996, Schroeder 2012, Geddes 2016). The three were co-recipients in 2010 of the American Physical Society’s John Dawson Award for Excellence in Plasma Physics Research from the American Physical Society, and each has been twice recognized with the LBNL Outstanding Performance Award.
L-R: BELLA Center Director Eric Esarey and Deputies Carl Schroeder and Cameron Geddes

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Eric EsareyEric Esarey has been performing research on intense laser-plasma interactions, advanced accelerator concepts and novel radiation sources for over 30 years. After receiving his PhD in 1986 in plasma physics at MIT, he worked for 12 years at the Naval Research Laboratory. During that time, he and his colleagues pioneered fundamental theory on nonlinear laser-plasma interactions that described the physics of laser-plasma accelerators (LPAs) and carried out groundbreaking experiments on LPAs.

Esarey joined Berkeley Lab in 1998 as a physicist within the theory group of the Center for Beam Physics, where he continued researching LPAs and related phenomena. He helped found the BELLA Center and grow it into the world leading program that it is today. Esarey had previously served as BELLA Center’s Deputy and as Senior Scientific Advisor to the ATAP Division Director. He now succeeds BELLA’s founding director, Wim Leemans, who has left LBNL for a position at DESY.

Schenkel describes Esarey as “a visionary and longtime leader in the field of LPAs with an integrating perspective on the program.”

Esarey’s recent honors include the AAC Prize from the 2018 Advanced Accelerator Concepts Workshop (an event that he will chair in 2020). Among his numerous publications are comprehensive review articles on plasma accelerators that are highly cited within the community. A technical backgrounder accompanying the announcement 2018 Nobel Prize in Physics explained the LPA concept with a diagram originally published in Physics Today by Leemans and Esarey. (See the related article, “2018 Physics Nobel Cites an ATAP Application.”)

Esarey’s deputies are described by Schenkel as “capable, energetic, and with diverse scientific backgrounds,” exemplars of a strong BELLA team “hungry for achievement.”

Carl Schroeder has been a leader of the theoretical and modeling efforts that support BELLA’s experimental work and future applications. After earning his doctorate at UC-Berkeley in 1999, followed by a postdoctoral fellowship at UCLA, he joined LBNL in 2001. His research interests range across BELLA’s intellectual portfolio, including intense laser-plasma interactions, plasma-based accelerators, advanced acceleration concepts, novel radiation sources, and free-electron lasers. “Carl is a theoretical leader not only in BELLA’s current work, but also in the long-term push toward an LPA-based lepton collider,” says Schenkel.

“Ultimately,” he adds, “mastery of laser drive plasma accelerators will enable us to explore physics beyond the Standard Model, and to make strides in understanding the nature of matter and energy, and do so with a much smaller physical and financial footprint than today’s collider technologies. Carl is driving this vision and is laying the foundation for its practical implementation.”

Cameron GeddesCameron Geddes is the lead experimentalist in the new BELLA Center leadership team.

“Cameron has a very strong foundation in high-energy and ultrafast lasers, and since his days as a graduate student has been a driving force and leader in the projects he works on,” says Schenkel.

Geddes has led a variety of the Center’s experimental projects. This includes a new laser facility for one of the many promising near-term applications of laser-plasma accelerators: compact quasi-monoenergetic gamma-ray sources for nuclear nonproliferation and security inspection. He has broad research experience in plasma physics, which at Berkeley Lab has included experimental designs for the PW laser, demonstration of novel concepts in particle injection and beam quality, staging experiments, high energy density science, and large-scale simulations. After working at Lawrence Livermore National Laboratory and Polymath Research on inertial-fusion-related laser-plasma interactions, he earned his doctorate at UC-Berkeley and LBNL in 2005, receiving the Hertz and APS Rosenbluth dissertation prizes. He joined the LBNL staff upon graduation. “Cameron brought a strong foundation in high-energy and ultrafast lasers to us, and since his days as a graduate student has always been a leader in everything he works on,” says Schenkel.

The path forward

BELLA Center is a world leader in the study of intense laser-plasma interactions and advancing the development of LPAs. Research there has demonstrated increasing single-stage electron beam energy gains, now at several GeV, together with lower-energy experiments on staging and on achieving high beam quality.

Going to ever higher energies will require using one LPA stage’s output as the input to the next, achieving more energy than is practical for a single stage. BELLA has achieved a first demonstration of staging. A major next step is to develop and implement a multi-GeV staging experiment. This very exciting and important effort has now been started with funding from DOE High Energy Physics.

In addition to electron beam acceleration, BELLA is exploring the applications of laser-plasma accelerated electron beams, e.g., with programs to develop compact radiation sources based on LPA electron beams.

Higher average laser power will be required for a lepton collider and also for many near-term LPA applications, and the BELLA Center is performing R&D to advance the development of these lasers. Fiber-based laser systems are among the candidates for this key enabling technology.

“Eric, Cameron, and Carl are all distinguished individuals and team leaders in their disciplines, and have been working together for many years to keep BELLA at the forefront of laser-plasma acceleration,” Schenkel says, adding, “BELLA is sure to enjoy continued growth and achievement under their leadership.”


Highlights of other recent and relevant ATAP-related news, in case you missed it…

Berkeley Lab Joins LaserNetUS 2018 Physics Nobel Cites an ATAP Application Three ATAP Endeavors Featured in APS-DPB Annual Highlights Synergies of Quantum Computing, Fusion Energy Outlined in New Report Future of Storage-Ring Light Sources Explored at DLSR Workshop


Help the Lab “Be Prepared” for Nuclear Science Day for Scouts

A scout is trustworthy, loyal, helpful, and informed about the atom: getting hands-on science experience at Nuclear Science Day, made possible by volunteers in all walks of life from across the Lab.

On Saturday, March 30, the Nuclear Science Division is again hosting the Nuclear Science Day for Scouts. It’s one of the most traditional and successful efforts in Berkeley Lab’s outreach and education mission. Giving some 180 young people a safe, positive and informative experience en route to a merit badge requires volunteers, and we invite you to consider participating.

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Tour guides from ATAP who have specific knowledge of the ALS are especially needed. (Particle accelerators, with their ongoing rich heritage of contributions to our knowledge of the atom, nucleus, and subatomic particles, are regarded as nuclear facilities for merit-badge purposes, and the Advanced Light Source is the focus of many of their experiences.)

However, you don’t need to be a scientist or engineering and technology professional to contribute to Nuclear Science Day for Scouts. Logistics and chaperoning are key parts of a good experience, so come help the Scouts learn that people from all walks of life play many positions in team science.

To learn more…
• Visit the Nuclear Science Day for Scouts website. The site also has a link for Scout leaders to sign up their troop. (Note: If you’re involved in Scouting, signing up as a volunteer increases the likelihood that your troop will be among those accepted for this space-limited and significantly oversubscribed event.)
• You can also learn more through this Berkeley lab photostory and sign up for the event’s Twitter feed.
• Contact Ina Reichel, ATAP’s Education and Outreach Coordinator, for more information about volunteering.
• The signup form for volunteers can be found here.

Marcia McNutt To Speak at 1:15 PM February 26 in B50 Auditorium

Berkeley Lab’s Distinguished Women in Science series presents Marcia McNutt in conversation with Lab Director Mike Witherell. McNutt, a geophysicist, is president of the National Academy of Sciences and was previously editor-in-chief of Science, just to name the two most recent posts in a career of both technical achievement and leadership. The event is in the Building 50 Auditorium and will be live-streamed.

Comment Period on Proposed Parental Leave Policy Ends March 6

The Lab is soliciting comments on a new Human Resources policy that would provide four weeks of paid parental leave for non-represented employees of the Lab to bond with a newborn or newly adopted child.

Comments can be made through March 6. Visit the Berkeley Lab “Elements” story for more information.

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ATAP and Engineering Safety Day is Thursday, March 28

Calendar showing March 28 with a red pin in it

This all-hands, all-hazards, all-day event has a mission of “Clean Labs, Clean Shops, Clean Offices,” reflecting a primary emphasis on good housekeeping and identification of hazards in common areas, offices, labs, and shops. As the day draws closer, further details and helpful information will be added to the Safety Day 2019 page on the ATAP website. Meanwhile, please mark your calendars and plan on hands-on participation in this communal investment in safe and efficient work environments.