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The physicist has set a record-breaking worldwide plasma-plasma acceleration using the laser drill



Wakefield acceleration can use different drivers. In the laser-guided case (top) a powerful plasma laser becomes a preformed plasma. On a proton-guided stage (bottom), a large proton is converted into a gas.
Enlarge / Wakefield acceleration can use different drivers. In the laser-guided case (top) a powerful plasma laser becomes a preformed plasma. On a proton-guided stage (bottom), a large proton is converted into a gas.

The particle accelerator accelerates the subatomic particles to the speed of light. The commitment demands millions of tunnels, these machines are usually incredibly expensive and expensive. Physicists are keen to make a viable version of the tablet to build a version capable of accelerating particles over single centimeters. Researchers at the National Lawrence Berkeley Laboratory have now achieved the highest energy used by the so-called "plasma wakefield accelerators" and describe a new paper in the new paper Letters on physical opinion.

Typical particle accelerators use electric modulated modules of metallic cavities to accelerate electrons. The Great Hadron Collider of Swiss CERN is ever built, a 16mm super magnesium ring with super magnesium, which boosts the electron's near-speed light. On the other hand, the acceleration acceleration of the plate makes short and short speeds of laser illumination in an ionized gas cloud (plasma).

As a result of a "waves" that plagate through plasma, the particle loads leave the "wake" behind, a speeding vessel will create a water sewer through a bridge across the lake. Then, the second laser transforms the electrons into plasma plasma. When it's done at an appropriate time, the electrons may "surf" over surfing. The electrons get Wakefield energy to get more speed, because a surfer lets the speed of the wave face accelerate.

There are several groups working on plasma wakefield acceleration, using different techniques. Earlier this month, CERN's Advanced Proton Plasma Wakefield Acceleration Experiment (AWAKE) uses a range of proton protons to create a driver's cover, such as a laser-pulse LBNL experiment, to send 2 electrons to GeV. AWAKE is a bit behind the Berkeley team, but two different plasma-wakefield acceleration methods make a good progress.

A 20-centimeter sapphire tube or capillary was used to obtain a world record. Tubes are used to create and limit plasmas and accelerate electrons "src =" https://cdn.arstechnica.net/wp-content/uploads/2019/02/plasma1-640x427.jpg "width =" 640 "height =" 427 " srcset = "https://cdn.arstechnica.net/wp-content/uploads/2019/02/plasma1.jpg 2x
Enlarge / A 20-centimeter sapphire tube or capillary was used to obtain a world record. Tubes are used to create and limit plasmas and accelerate electrons.

Tabletop accelerators are very practical in medical therapy, X-ray imaging and possibly in security scanner technology. In fact, in 2015 Gordon and the Betty Moore Foundation donated $ 13.5 million in grants to the University of Stanford for the development of a shoebox "accelerator" for 2020. As computers are definitely fulfilled, rooms and laptops, tablets and smart phones are very good. In the end, micro-manufacturing techniques must be used to build a manual handheld accelerator (even if the radiation does not lead to the device being moved to the right).

This latest work focuses on the work of the LBNL leader, Wim Leemans; He is currently Director of the German DESY Accelerator. In 2014, he and his team obtained a 4.25 gigabyte (GeV) agreement. They used an electrical installation to extract a plasma, within a short, thin tube. They then injected a laser light pulse into an ionized gas to drill a channel to light the optical fiber cable channel. They have also created waves that trap electrons and accelerate energy.

This process requires laser precision and high precision when it is 45 meters above sea level of 500 meters. Fortunately, LBNL has one of the strongest and most accurate Laser Accelerators (Berkeley Lab Laser Accelerator). While the 2014 experiment was successful, the laser light was so powerful that it destroyed the structure of the sapphire pipeline and thus lost its close focus.

Leemans et al. I know that plasma paths should be less compact in order to achieve greater energy. In this way, they gradually established a little more, borrowing a technique in the 90s: eight-nanosecond laser pulse shot after the tube (420 nanoseconds later, more precisely). We have a hot plasma pulse and a deep channel capable of fully combining the laser. This can be used for a longer 20 cm tube, compared to the 9cm tube used in the 2014 experiment.

The plasma density of electron density (blue) in the plasma is composed of capillary (gray) and combines electrical discharge and 9ns laser pulse (red / yellow). "Src =" https://cdn.arstechnica.net/wp-content / uploads / 2019/02 / plasma2-640x419.jpg "width =" 640 "height =" 419 "srcset =" https: //cdn.arstechnica .net / wp-content / uploads / 2019/02 / plasma2 .jpg 2x
Enlarge / The plasma density of electron density (blue) in the plasma is composed of capillary (gray), combining the electricity queue combination and 9 combining laser pulley (red / yellow).

Applied Institute G Bagdasarov / Keldysh Math; A. Gonsalves, J.L. Vay / LBNL

"Developing a stable plasma accelerator is developing with 10 GEV energy in the first sections," said Leemans. "We have developed a new toolbox concept and, in addition, with the development of DESY acceleration, beam stabilization and other beam control concepts, electron-intensive sources."

But we're not quite sure. Write PhysicsFlorian Grüner, from the University of Hamburg, stated that the successful 100-MeV energy achievement was basically the launch of this new Wakefield Acceleration Plasma. He compared it with the landmark published by Jules Verne's 1865 novel, From the ground to the moonIn space in 1961, spacecraft exploration space was launched. However, landing on the Moon in 1969 was not reached either.

"There is still no light as a Wakefield-Accelerator user installation that will happen with" Moon landing ", writes Grüner. "To achieve this goal, an unprecedented level of control will be developed for the control of important parameters, which implies the inclusion of new" wrists "of all things like the expansion of energy-efficient particles.

DOI: Letters on physical opinion, 2019. 10.1103 / PhysRevLett.122.054802 (about DOI).


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