Date: Monday, 22 January 2024
Time: 14:00 - 15:30 (seminar)
Location: DESY, room 4 a/b in building 01b (second floor)
Type: Hybrid meeting
Speaker: Vasyl Maslov, National Science Center Kharkiv Institute of Physics and Technology, Kharkiv, Ukraine
Organizer: Gianluca Geloni, Sandra Kniehl
Modern experimental particle physics is stymied by the limits of possible acceleration that conventional particle accelerators can provide. Scientists desperately need new, more powerful acceleration tools. A plasma wakefield accelerator could be such a tool. It has accelerating gradients orders of magnitude larger than those of conventional accelerators. The most impressive experimental results until now in electron accelerating by a wakefield, excited in a plasma, have been achieved using capillary-generated plasma. Plasma-wakefield acceleration provides high accelerating gradients, promises compact accelerators of high-brightness and high-energy electron beams. Applications of plasma-wakefield accelerators, in particular, particle colliders and free-electron lasers demand low energy spread beams, their small emittance, high current of accelerated bunches, large transformer ratio and high-efficiency operation. Achievement of these requires plateau formation on both the accelerating fields for witness-bunches and the decelerating fields for driver-bunches. As it is known plateau formation is possible by controlled beam loading with careful shaping current profile and beam charge selection. Such optimal beam loading will be demonstrated by numerical simulation by PIC codes in a blowout electron-driven and laser-driven plasma accelerators. Externally injected beams for electron-driven plasma accelerator are prepared with RF linear accelerator with high beam quality. Laser-driven plasma accelerators are considered with self-injection of electron bunches. Systems with a large transformer ratio, taking into account high efficiency, identical plateaus for driver-bunches, and other identical plateaus for witness-bunches, the large charge of witness-bunches will be shown.
The plasma undulator is important for sources of high-energy photons. Betatron oscillations will be demonstrated by numerical simulation by PIC code in a laser-driven plasma undulator.
For accelerated bunch focusing and for synchronous radial oscillations in plasma undulator the homogeneous focusing fields are important. Formation of homogeneous focusing fields for short as well as for relatively long electron bunches will be demonstrated by numerical simulation by PIC code in a plasma.