113 research outputs found
Increased sensitivity for asymmetry measurements at linear colliders with polarized electron and positron beams
No full textThe author discusses theoretically the determination of the asymmetry of polarized beams in linear e"+e"--colliders, when both beams are polarized. Especially he considers the effects of the additionally polarized positron beam on the measurement of the left-right asymmetry at the Z"0-pole. (HSI)Available from TIB Hannover: RA 2999(95-064) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
Lower Limit of the Transverse Emittance Growth in Deflecting RF Fields
No full textThe Panofsky-Wenzel theorem connects the transverse deflecting force in an rf structure with the existence of a longitudinal electric field component. In this paper it is shown that a transverse deflecting force is accompanied by an additional longitudinal magnetic field component which leads to an emittance growth in the direction perpendicular to the transverse force. The general description of transverse deflecting waves requires a linear combination of basis modes to cope with the boundary conditions and to support the simultaneous existence of electric and magnetic longitudinal field components. The mode description is preferably performed in the hybrid HM–HE basis to avoid convergence problems, which are fundamental for the transverse TM–TE basis
Optimization of the Resolution of a Streaking Setup
No full textIn low regimes the inevitable induced energy spread in combination
with longitudinal dispersion during the drift through a transverse deflecting
structure (TDS) can alter the phase space of the particle bunch to be
characterized. The consequential bunch lengthening can render measuring
ultra-short bunches impossible, even for high available streaking powers and
hence theoretical resolution. In this work the resulting effective resolution
of a TDS is estimated analytically and the optimal streaking voltage is
determined. The findings are subsequently benchmarked using matrix-based
particle tracking. Furthermore, additional transverse, as well as other
resolution limiting effects of a realistic streaking setup are discussed. A
potential mitigation scheme using an additional downstream focusing element is
evaluated
TESLA : the superconducting electron-positron linear collider with an integrated X-ray laser laboratory. Technical design report. Part 2: The accelerator
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