Reaching 2 petawats of power, Zeus facilities funded by NSF at the University of Michigan support research with potential benefits for medicine, national security, material science, and other fields.
The Zeus laser facility at the University of Michigan has reached its first official experiment at 2 Petawatts (2 Quadrillion Watts), almost double the peak power of other lasers currently operating in the United States.
Beyond the total electricity produced worldwide more than 100 times, this very large explosion of power only exists for a very short laser pulse range, only 25 Quintilonths from one second.
“This milestone marks the beginning of the experiment that has moved to an area that has not been explored for high American field science,” said Karl Krushelnick, Director of Gérard Mourou Center for Ultrafast Optical Science, which accommodates Zeus.
Applications throughout science and society
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Research in Zeus will have applications in the fields of medicine, national security, material science and astrophysics, other than plasma Quantum Science and Physics. Supported by the US National Science Foundation, Zeus is a user facility – meaning that the research team from all over the country and international can submit an experimental proposal that goes through an independent selection process.
“One of the great things about Zeus is not just one large laser hammer, but you can divide the light into several blocks,” said Franklin Dollar, Professor of Physics and Astronomy at the University of California, Irvine, whose team runs the first user experiment at 2 petawatts. “Having a national resource like this, which gives time to users whose experimental concepts are the most promising to advance scientific priorities, really bringing high intensity laser scientific science back to the US”
Producing beams of particle accelerator level
The dollar team, working with the Zeus facility, aims to produce electron beams with energy comparable to those produced in particle accelerators that stretch for hundreds of meters. These beams will carry energy 5 to 10 times more than previously achieved in Zeus.
“We aim to achieve higher electron energy using two separate laser beams – one to form a guide channel and the other to accelerate electrons through it,” said Anatoly Maksimchuk, UM research scientist in the field of electrical and computer engineering, which led the development of experimental areas.
Part of this effort involves a designed target. The team expands gas cells containing helium where laser pulses are directed. When the pulse passes through, he stripping electrons from the atom, making plasma – a mixture of free electrons and positively charged ions. The released electrons are then pulled after laser pulses, such as surfers riding waves behind the speeding boat, in a process known as wakefield acceleration.
Because light moves slower through plasma, electrons can pursue laser pulse. With a longer and denser target, they can spend extra time to speed up before overtaking the pulse, allowing them to reach a much higher speed.
Towards the Zettawatt scale experiment
The demonstration of the ability of Zeus to establish a stage for the Tengara experiment, which is expected to end later this year, where the accelerated electron will collide with a counter -laser propagation pulse. From an electron perspective, the 3-Petawat laser pulse will appear to be strengthened on the Zettawatt scale. This phenomenon gave Zeus his full name: “Zettawatt Equivalent Ultrashort Laser Pulse System.”
“Basic research conducted at NSF Zeus facilities has many possible applications, including better imaging methods for soft tissue and advancing technology used to treat cancer and other diseases,” said Vyacheslav Lukin, Director of Programs in the NSF Physics Division, who oversees the Zeus project. “Scientists who use Zeus’s unique abilities will expand the limits of human knowledge in new ways and provide new opportunities for American innovation and economic growth.”
Zeus facilities match the space similar to school games. In one corner of the room, the laser produces initial infrared pulses. The optical device called the diffraction lattice stretches it in time so that when the pump laser throws the pulse into the pulse, it does not become so intense that it starts to tear separate air. The biggest, pulse is 12 inches and several long legs.
After four laser pumps add energy, the pulse enters the vacuum. Another set of lattice leveling it to a 12-inch disk which is 8 microns-around 10 times thinner than a piece of printer paper. Even at 12 inches crossing, its intensity can convert air to plasma, but then focused up to 0.8 microns wide to provide maximum intensity to the experiment.
https://www.youtube.com/watch?v=3syblssqbze
Animated flying from the Zeus laser system. Credit: Michigan University
“As a medium -sized facility, we can operate more nimble than large -scale facilities such as particle accelerators or national ignition facilities,” said John Nees, UM research scientist in the field of electrical and computer engineering, who led the Laser Zeus construction. “This openness attracts new ideas from a wider scientist community.”
Challenges in building full power
The road to 2 Petawatts is slow and careful. Only getting the pieces they need to assemble the system is more difficult than expected. The biggest challenge is the sapphire crystal, infused with titanium atoms. Diameter of almost 7 inches, this is an important component of the final system of the system, which carries laser pulses to full power.
“The crystals we will get in the summer will make us 3 petawatt, and it takes four and a half years to be produced,” said Franko Bayer, project manager for Zeus. “The size of the Titanium sapphire crystal that we have, there are only a few in the world.”
Meanwhile, jumping from the power of 300 maintained from Laser Hercules previously to only 1 petawatt in Zeus resulted in the darkness of the darkness of the grid. First, they must determine the cause: are they permanently damaged or only embezzled by carbon deposits from strong beams that tear molecules -molecules that float in imperfect vacuum spaces?
When it turns out that it is a carbon deposits, Nees and the laser team must find out how many laser shots can run safely between cleaning. If the grids become too dark, they can distort the laser pulses in a way that damages optics further along the road.
Finally, the Zeus team has spent a total of 15 months running the user experiment since the opening in October 2023 because there is still a lot of knowledge that can be done with laser 1 petawatt. So far, he has welcomed 11 separate experiments with a total of 58 experiments from 22 institutions, including international researchers. Over the following year, between the user’s experiment, the Zeus team will continue to increase the system to its full potential.
Supported by the US National Science Foundation
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