Improved ramped bunch train to increase the transformer ratio of a two-channel multimode dielectric wakefield accelerator

Details Improved ramped bunch train to increase the transformer ratio of a two-channel multimode dielectric wakefield accelerator Improved ramped bunch train to increase the transformer ratio of a two-channel multimode dielectric wakefield accelerator

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011phrvs..14c1302s&link_type=abstract

Physical Review Special Topics - Accelerators and Beams, vol. 14, Issue 3, id. 031302

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Relativistic Electron And Positron Beams, Other Advanced Accelerator Concepts, Laser-Driven Acceleration, Particle Acceleration

Scientific paper

Here we show a possibility of applying the ramped drive bunch train (RBT) technique to a two-channel coaxial dielectric wakefield accelerator (CDWA). For numerical research we study a 28 GHz structure with two nested alumina cylindrical shells having these diameters: outer shell, OD=28.1mm, ID=27mm; inner shell, OD=6.35mm, ID=4.0mm. The structure is to be excited by a train of four annular bunches having energy 14 MeV and axial rms length 1 mm; the total charge of bunches is 200 nC. In the case of equally charged drive bunches, spaced apart by the principal wakefield wavelength 10.67 mm, we obtained transformer ratio T=3.4. If the bunch charge is increasing as the ratio 1∶3∶5∶7 and the bunches are spaced by one and one-half wavelengths, we obtained T=3.8. We found that if the charge ratios are 1.0∶2.4∶3.5∶5.0 and the spaces between the bunches are 2.5, 2.5, and 4.5 wakefield periods, then T increases strongly, T˜20. The RBT also can be used successfully in a high gradient THz CDWA structure. A particle-in-cell simulation shows that the four drive bunches can move without appreciable distortion.

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