Concept design of a new structure of 1.3GHz single-cell superconducting cavities

This paper reports on a new design of single-cell superconducting cavities, It consists of two half-end cells of the 9-cell Beijing TESLA shape accelerating cavity, The ratio of the maximal surface electric field to accelerating gradient, E-p/E-acc, of the pi mode of the 9-cell cavity was reduced to 2.024. The cell-to-cell coupling k is as high as 1.95%. The E-p/E-acc in the single-cell cavities was reduced to 1.8. The monopole, dipole, and quadrupole high-order modes (HOMs) were calculated using URMEL-T with the resistance-band model. In addition, the concept of the structure parameters of the niobiun cavity introduced the condition of calculation reliability with the codes; the calculation reliabilities of URMEL and URMEL-T were also discussed.Physics, NuclearPhysics, Particles & FieldsSCI(E)1ARTICLE1491-5032