Sextupole correction of the longitudinal transport of relativistic beams in dispersionless translating sections

Details Sextupole correction of the longitudinal transport of relativistic beams in dispersionless translating sections Sextupole correction of the longitudinal transport of relativistic beams in dispersionless translating sections

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvs...8a2801e&link_type=abstract

Physical Review Special Topics - Accelerators and Beams, vol. 8, Issue 1, id. 012801

Physics

Optics

5

Beam Optics, Beam Handling, Beam Transport, Other Advanced Accelerator Concepts

Scientific paper

We examine the use of sextupole magnets to correct nonlinearities in the longitudinal phase space transformation of a relativistic beam of charged particles in a dispersionless translating section, or dogleg. Through heuristic analytical arguments and examples derived from recent experimental efforts, augmented by simulations using the particle tracking codes PARMELA and ELEGANT, sextupole corrections are found to be effective in optimizing the use of such structures for beam compression or for shaping the current profile of the beam, by manipulation of the second-order longitudinal dispersion. Recent experimental evidence of the use of sextupoles to manipulate second-order horizontal and longitudinal dispersion of the beam is presented. The theoretical and experimental results indicate that these manipulations can be used to create an electron bunch with a current profile having a long ramp followed by a sharp cutoff, which is optimal for driving large-amplitude wake fields in a plasma wake field accelerator.

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