Category Archives: berkeley lab

Using machine learning to achieve diffraction-limited performance with x-rays deformable mirrors

In a our last paper, we present the use of machine learning to get the most of x-ray adaptive optics – and it works like magic! This was a great work accomplished by Gautam Gunjala, a grad student from UC Berkeley under a SCGSR grant, together with our wonderful colleagues from the Advanced Photon Source.

X-ray adaptive mirrors are very nice, because they allow to correct the shape of x-ray beams, when the beam gets distorted by mirror deformation or misalignment. That’s why we want to use them in the latest generation of synchrotron light source such as ALS-U or APS-U.

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The Advanced Light Source upgrade project has received the Critical Decision 3, the very last step before we start building the facility – a $590M project for the US Department of Energy.

This is a great news for the facility, which will become the brightest soft x-ray light source in the world. I have worked on this project over the last five years, designing and simulating the new feature beamlines and developing new technologies to ensure optimal performance.

Berkeley Lab news center: Advanced Light Source Upgrade Approved to Start Construction

“Wavefront Preservation in Soft X-Ray Beamlines for the Advanced Light Source Upgrade.”
Antoine Wojdyla & Kenneth A. Goldberg
Synchrotron Radiation News, 34(6), 21–26 (2021).

Penn State University (Fall 2022)

I had a great time at Penn State University, where I was positively impressed by the facilities and the people!

I mainly visited the Material Research Institute and the department of Astronomy and Astrophysics, where they are developing x-ray adaptive optics for space application together with NASA, for the Lynx project.

Millennium Science Center, Penn State University (November 2022)

Thanks Susan Trolier-McKinstry for hosting me!

Angela Saini at Berkeley Lab

We were pleased, as Berkeley Lab Global Employee Resource Group co-chairs, to invite and co-organize with Angela Saini at Berkeley Lab on November 9th, 2022.

Author Angela Saini in conversation with Aditi Chakravarti from the Diversity and Inclusion office at Berkeley Lab (IDEA)

More details about the event:

Moment of pride

We won the San Francisco pride… Say it Loud: Lab Wins Pride Parade Award

new website: dream beam

Hello everyone!

I have a new website to talk more specifically about our work on adaptive optics for coherent beamlines (the DREAM beam project.)

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How to get the most out of a conference in person

Making the most out of a conference is a good idea! My friend Maria Zurek (former Berkeley Lab postdoc, now at Argonne) made a very interesting talk, and here are her slide:

Maria Zurek (left) and I (right) with Jeff Welser (IBM VP of research, center) and the rest of the Berkeley Lab Postdoc Association in October 2019

She gave a few great pieces of advice, here are my favorites:
– come to the conference with your slides READY. If they’re not ready, you will miss most of the social hours, where the networking happens (that’s a hard one – but very true: a conference is mostly about meeting people, not presenting your research.)

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Dream beam

I am very happy to announce that was granted en Early Career Research Award by the US Department of Energy, to work on the DREAM beam: Diffraction-limited Radiation Enhancement with Adaptive Mirrors for x-ray coherent beamlines.

Here are some news releases:

They may say I’m a dreamer, but I’m not the only one

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Yesterday we received a visit of the speaker of the House, Nancy Pelosi, who came to Berkeley lab for a press conference around the COMPETES act, which aims to bolster STEM education in the US and revive semiconductor manufacturing.

Full video: Speaker Pelosi Holds Event on America COMPETES Act

When people ask me what are the answers to some of the challenges that we face, I always say the same thing: Science, Science, Science and Science – Nancy Pelosi

We are quite honored that she chose the Advanced Light Source as backdrop for the announcement. There were also other congresswomen Barbara Lee and Doris Matsui, together with Intel CEO Pat Gelsinger and UC President Michael Drake.

Nancy Pelosi speaking in front of the Advanced Light Source

That day felt almost normal – I haven’t seen that many people from the lab in two years. And at the same time, the situation was quite absurd: me right here, among people with the power to change science, at the dawn of WWIII.

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EUV lithography makes headlines

EUV lithography is now part of everything – including the chips in your iPhone 12 and beyond. I don’t know if it’s because of the chip shortage, the $50B investment of the US government in semiconductor manufacturing, or the realization that having a nearly monopolistic market with its biggest player in Taiwan, at the mercy of an invasion, but there’s a lot of press on EUV lithography right now (I’ve been talking about my work on the topic at Berkeley Lab here: SHARP and MET5, and shared some thoughts on Moore’s law here.)

Me at the inaugural Berkeley Lab Slam (2016), talking about EUV lithography

Here’s a few pieces:

In this story, ASML is the quiet powerhouse – they have a de facto monopoly (their stock rose 10x over the last 5 years) and they keep expanding (ASML opens new state-of-the-art R&D facility in Silicon Valley.) There’s been some hardball played here, with the US pressuring the European company not to sell their technology with China (Reuters), as if it made any sense.

Besides, I am stoked to see my former colleagues from the Center for X-Ray Optics receive recognition for their work!

I hope we’ll get to develop new techniques with x-rays using diffraction-limited beams to further the advances in semiconductors and microchips – skyrmions, superconductivity, memristors, and so many other cool things!

power spectral density of an EUV coherent beam reflected on a naturally rough surface going through an objective zoneplate with a topological charge of 1