SPIRAL 2 resonators

Preliminary study of a niobium quarter-wave prototype cavity for a heavy-ion superconducting linac

“…As for the second type, the E pk /E acc ratio is reduced by the optimization of the drift tube dimensions and B pk /E acc by a careful choice of the shape of the stem. In this paper, the definition of the accelerating gradient, E acc = V acc /(βλ), is used, where V acc = E z (z)e iωz/βc dz , in order to have a shape independent definition for the accelerating field [5]. E pk is the maximum surface electric field and B pk is the maximum surface magnetic field.…”

“…Different geometries, like spoke, half-wave, quarter-wave resonator (QWR) and reentrant, have been put forward for beam velocities up to β=0. 5, where multi-cell type superconducting cavities start to achieve good efficiency [1,2].…”

Beam steering correction of the quarter wave resonator in the HISCL

“…The low-β Quarter Wave Resonators (QWRs) are applied extensively by existing and under construction heavy ion accelerators to accelerate ions in the low energy part, such as Facility for Rare Isotope Beam (FRIB) [2], spiral2 [3] and so on. The wide application of superconducting QWRs is due to its excellent properties, such as the high accelerating gradient, high efficiency, small volume and the possibility of accelerating particles with different q/A in the same linac [4].…”

Status of the cryomodules for the SPIRAL 2 superconducting LINAC

“…In order to present comparable values of the accelerating field for the two cavity types at different β, E acc is defined as E acc = Vacc/(β opt λ), where Details of the cavity and cryomodule design were described in [2,3]. We focus here on the general points and the status of the project.…”