The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.

A New Way to Measure Record-Setting Electron Beams

Team working at Berkeley Lab’s BELLA Center develops new diagnostic technique
Lawrence Berkeley National Laboratory

Newswise — Physicists at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) are figuring out new ways to accelerate electrons to record-high energies over record-short distances with a technique that uses laser pulses and exotic matter known as a plasma. But measuring the properties of the high-energy electron beams produced in laser-plasma acceleration experiments has proven challenging, as the high-intensity laser must be diverted without disrupting the electron beam.

Now, a new, compact system has been successfully demonstrated at the Berkeley Lab Laser Accelerator (BELLA) Center to provide simultaneous high-resolution measurements of multiple electron-beam properties.

The new system uses ultrathin liquid-crystal films, developed by Prof. Douglass Schumacher and his team at Ohio State University, to redirect the laser while allowing the electron beam to pass through, largely unaffected. The laser forms a plasma that reflects the bulk of its laser light.

While each laser pulse destroys the liquid-crystal film, similar to a bubble machine, the liquid-crystal film is replenished by a rotating disc and wiper device after each laser shot. The films formed by this device are just tens of nanometers (billionths of meters) in thickness, about a factor of 1,000 thinner than those in other replenishable plasma mirror systems that use VHS cassette tape, for example. This reduction in thickness serves to preserve the electron beam’s properties.

The deflection of laser light away from the electron beam is essential for producing a precise diagnostic of the electron beam, noted Jeroen van Tilborg, a BELLA Center staff scientist, and it is also crucial for multistage laser-plasma acceleration experiments, in which the laser pulses are refreshed at each stage to provide an additional “kick” of acceleration for the electron beam until it reaches its required acceleration.

The liquid-crystal plasma mirror (LCPM) also enables the use of a gas-filled, 6-centimeter-long strong focusing device for the electron beam, known as an active plasma lens.

This lens allows a compact alternative to a large diagnostic tool called a magnetic spectrometer device, which has bulky magnets that weigh more than a ton and are coupled to a large power supply.

“We were able to replace this with dipole (two-pole) magnets about the size of a sandwich,” said Sam Barber, a research scientist at the BELLA Center in Berkeley Lab’s Accelerator Technology and Applied Physics (ATAP) Division. “Laser plasma accelerators can produce high-energy electrons in compact footprints, but there is still much that can be done to shrink some of the components, including electron beam diagnostics.”

He added, “This is a huge reduction in the scale. We are combining a petawatt (high-power) laser with ultrathin LCPMs and active plasma lenses – all novel technologies that have just recently been developed. We combined all three of them and we got a nice result. We are making big steps forward. There is a whole slew of new applications that this could be used for.”

Barber was the lead author of a study detailing the performance and setup of the new diagnostic tool, published in the journal Applied Physics Letters. Other BELLA Center researchers participated in the study, too, along with researchers from UC Berkeley and Ohio State University. The latest advances were supported by LaserNetUS, a recently formed network of high-power laser facilities.

Carl Schroeder, a Berkeley Lab senior scientist who is deputy director of the BELLA Center, said that besides its compactness, the new diagnostic technique can collect several electron-beam properties at once, including the detailed energy distribution of the electron beam and the beam’s emittance, on a single-shot basis. Emittance is a critical property of an electron beam that dictates how tightly the beam can be focused. A low emittance means the beam can be focused down to a very small spot, crucial for most accelerator applications like colliders and free-electron lasers.

“Typically, these are multishot diagnostics,” he said, which average the measurements of several beam pulses but don’t measure on a pulse-by-pulse basis – as does the new technique.

In the demonstrated setup, a laser is focused into a gas cell, where it creates and interacts with a plasma, generating and accelerating an electron beam. After passing through this cell, the combined laser beam and electron beam arrive at the LCPM, at which point the laser is deflected while the electron beam is transmitted – with negligible disruption.

The electron beam then passes through the active plasma lens. The lens is used to focus the electron beam into a sequence of small magnets. The magnetic field disperses the electrons according to energy – much like the way light is dispersed by color when passing through a prism.

The dispersed electron beam then passes through a special crystal that produces light as the electron passes through. High-resolution images of the crystal’s light signature enable a precise, sub-percent-resolution mapping of the energy of the electron beam, and simultaneous emittance measurements.

The measurements can ultimately help researchers to troubleshoot, tune, and improve the performance of laser-plasma acceleration experiments, and the setup could potentially be relevant for future collider applications and compact X-ray free-electron lasers, researchers noted, which could have a wide array of applications.

“You want to be able to rapidly characterize these beams and use that as feedback for optimization,” Barber said. “This is useful for the characterization and control of electron-beam properties.”

The study was supported by the U.S. Department of Energy Office of Science, which also supports the BELLA Center, and by the Gordon and Betty Moore Foundation.

# # #

Founded in 1931 on the belief that the biggest scientific challenges are best addressed by teams, Lawrence Berkeley National Laboratory and its scientists have been recognized with 14 Nobel Prizes. Today, Berkeley Lab researchers develop sustainable energy and environmental solutions, create useful new materials, advance the frontiers of computing, and probe the mysteries of life, matter, and the universe. Scientists from around the world rely on the Lab’s facilities for their own discovery science. Berkeley Lab is a multiprogram national laboratory, managed by the University of California for the U.S. Department of Energy’s Office of Science.

DOE’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit energy.gov/science.

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