Design of a 450 MHz β = 0.2 single spoke cavity at PKU

Abstract

The design of a 450 MHz β=0.2 superconducting single spoke cavity has been finished at Peking University. A theoretical model and a numerical simulation are used to study the relationship between the RF performance and the geometric parameters of the cavity. In this paper, the optimization of the spoke cavity is described in detail. The RF simulation gives the optimum parameters E pk /Eacc of 2.65 and B pk /Eacc of 5.22 mT/(MV/m). The mechanical properties of the cavity are also studied. Two stiff ribs are used to offer a credible mechanical stability.

Design of a 325 MHz SC Spoke040 cavity at IHEP

“…(vertical test) facilities and the end flanges; Simple the structure, make it easier to fabrication and progress; R/Q and G should be as large as possible to achieve promising Q 0 ,decrease the P c . We used the original design progress to choose the main geometric parameters for the Spoke040 cavity [4,5]. First we chosen Lg − g = β g λ/2 = 185.0mm, Lcav = 2/3 * g λ = 247.0mm, 2 * rb/Lcav = 0.4, W/Lcav = 0.8andRspoke01 = Rspoke02 = Rspoke03.…”

Design study on very low Beta spoke cavity for China-ADS

“…[6] For a spoke cavity, several parameters may typically be optimized, such as the spoke shape, spoke width-W, the gap ratio T/L iris and ratio D/L cav . [7] [8] As an example, Table 1 and Figure 4 show the optimization of the spoke shape for the traditional spoke012 cavity. Table 1 indicates that the elliptical spoke shape has better RF properties: For the new structure, Spoke009T, besides the above parameters, we have also investigated the influence of the effective cavity length (L iris ) while keeping L g-g constant, L g-g =3/2=30.087923/2=120mm.…”

“…For a spoke cavity, several parameters may typically be optimized, such as the spoke shape, spoke width-W , the gap ratio T /L iris and ratio D/L cav [7,8]. As an example, Table 1 and Fig.…”