The DESYA team of scientists has created a miniature double particle accelerator. It has the ability to process part of the laser energy supplied to double the energy of the accelerating electrons. The device uses narrow-band terahertz radiation, which is located in the electromagnetic spectrum between infrared and radio frequency. And a gas pedal tube is only 1.5 centimetres long, with a diameter of 0.79 millimetres. Dunfang Zhang and Etal of DESY’s Free Electron Laser Science Center (CFEL) presented their experimental accelerator in Physical Review X magazine.
The small size of the device is due to the short wavelength of the terahertz radiation. The Terahertz-based accelerators have become promising candidates for the future generation of compact electron sources, as Franz Kärtner explained. He is a leading scientist at DESY and leads the CFEL team that built the instrument.
Scientists have successfully experimented with terahertz accelerators. It can activate functions when large particle accelerators are simply not possible or important. However, this technique is not yet highly developed, and the results of the work of the experimental accelerator on terahertz have made it possible to limit the range of interaction between the terahertz pulse and the electronami.
The new device needed a longer pulse, consisting of several terahertz wave cycles. This multicyclical pulse greatly expands the range of interaction with particles. Scientists inject a multicyclic terahertz pulse into a dielectric waveguide. Inside the waveguide, the heart rate decreases.
An electron beam attracts the central part of the waveguide just in time to make it move with the momentum. This idea extends the interaction zone between the terahertz pulse and the electron beam to a range larger than a few millimeters in previous experiments.
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