Closed analytical expression for the electric field profile in a loaded rf structure with arbitrarily varying vg and R'/ Q

Details Closed analytical expression for the electric field profile in a loaded rf structure with arbitrarily varying vg and R'/ Q Closed analytical expression for the electric field profile in a loaded rf structure with arbitrarily varying vg and R'/ Q

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrvs...3d2001g&link_type=abstract

Physical Review Special Topics - Accelerators and Beams, vol. 3, Issue 4, id. 042001

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The design of a detuned and damped accelerating structure implies variations in the geometry which induce, in turn, a variation of the group velocity vg and the impedance per unit length R', divided by the quality factor Q. The resulting differential equation for the longitudinal electric field (fundamental mode) contains coefficients that depend on the distance z along the structure. This report describes a possible method to solve this nonlinear, first-order differential equation analytically and how to obtain approximate closed algebraic forms, by using the sequence of Gauss integration methods. Analytical expressions of the longitudinal field profile in a loaded or unloaded accelerating section are deduced for both linear and arbitrary variations of vg and R'/Q. Simple relations between the average field and the field at the entrance of the structure E\(0\) make it possible to provide the dependence of the field function E\(z\) on the design value for and on the structure parameters. The results are in good agreement with the direct numerical integration. Applications are presented for particular structure designs.

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