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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.