High-power petawatt laser set to begin operation at University of Michigan

The 3 petawatt (3 PW) ZEUS laser at the University of Michigan (U-M; Ann Arbor, MI) has been awarded $18.5 million by the National Science Foundation (NSF; Alexandria, VA) to establish it as a federally funded international user facility. ZEUS is expected to begin its first experiments in early 2022.

The U.S. built the world’s first petawatt laser in 1996, but hasn’t kept pace with more ambitious systems under construction elsewhere in the world. This includes two 10 PW lasers in Europe and a 5.3 PW laser in China, which also has plans to build a 100 PW laser. While the new laser doesn’t pack as much raw power, its approach will simulate a laser that is roughly a million times more powerful than its 3 PW.

The ZEUS laser will primarily be used to study extreme plasmas , a state of matter in which electrons break free of their atoms, forming what amounts to charged gases.

Experiments at the facility are expected to contribute to the understanding of how the universe operates at the subatomic level, how astrophysical phenomena such as jets can be produced by black holes, how materials change on extremely fast timescales, and to the development of smaller and more efficient particle accelerators for medical imaging and treatment.

“Extreme plasma made with ‘tabletop’ laser technology offers a lower-cost alternative for fundamental research in physics compared to large-scale particle accelerators, which cost billions to build,” says Franko Bayer, project manager of the construction of ZEUS.

At first, one of the three target areas will launch experiments at half a petawatt, a sixth of its peak power. The laser will send either one or five ultrashort laser pulses per second, with each pulse lasting between 20 and 25 quadrillionths of a second, into targets made of gas—turning gas atoms into plasma. The system will gradually ramp up to full power over two years, scheduled to begin its signature experiments and user operations in October 2023.

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