Publications by authors named "S Baturin"
We present an analytical study on the effects of the transverse plasma gradient in the blowout regime of a plasma wakefield accelerator. The analysis departs from a simple ballistic model of plasma electrons and allows us to derive a complete analytic solution for the pseudopotential and, consequently, for the wakefield. We demonstrate that the transverse plasma gradient modifies the bubble shape and affects the wakefield; namely, the dipole plasma gradient results in a dipole component of the wakefield.
View Article and Find Full Text PDFWakefield based accelerators capable of accelerating gradients 2 orders of magnitude higher than present accelerators offer a path to compact high energy physics instruments and light sources. However, for high gradient accelerators, beam instabilities driven by commensurately high transverse wakefields limit beam quality. Previously, it has been theoretically shown that transverse wakefields can be reduced by elliptically shaping the transverse sizes of beams in dielectric structures with planar symmetry.
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- Collinear wakefield acceleration can produce very high acceleration gradients, prompting research to improve the transformer ratio (TR), which measures the efficiency of acceleration behind a drive bunch.
- To maximize TR, researchers have shifted focus to creating asymmetrical drive bunch distributions since conventional symmetrical ones limit TR to below 2.
- This study showcases the use of an emittance-exchange method to shape the drive bunch, achieving an experimental TR of about 5 in a dielectric wakefield accelerator.
Article Synopsis
- - The study investigates how the actual emission area affects electron emission in nitrogen-incorporated ultrananocrystalline diamond (N-UNCD) field emitters, using high-resolution imaging and automated data processing to analyze emission characteristics.
- - Researchers found that electron emission was limited to specific emitting centers on the surface, which varied in size and efficiency, and that the emission area was influenced by the applied electric field and the amount of sp-hybridized carbon in the film.
- - When the measured current-electron emission characteristics were adjusted for the variable emission area, the results showed a notable kink in the j-E curves that deviated from the expected Fowler-Nordheim behavior, indicating that this saturation value is a fundamental property of N
A new projection type imaging system is presented. The system can directly image the field emission site distribution on a cathode surface by making use of anode screens in the standard parallel plate configuration. The lateral spatial resolution of the imager is on the order of 1-10 μm.
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