RF and Cryogenic Tests of the First Beta 0.12 SPIRAL2 Cryomodule

The SPIRAL 2 project, installed in GANIL for Radioactive Ion Beam physics purposes requires the manufacturing of a multi beam driver. This driver is based on a superconducting LINAC [1] featuring two 88 MHz Quarter Wave Resonator (QWR) families. IPN Orsay is in charge of the study and the assembly of the 7 high energy (beta = 0.12) cryomodules. Each cryomodule is composed of two QWRs, specified to operate at 4.2 K at a nominal accelerating gradient of 6.5 MV/m. A first “qualifying” cryomodule has been manufactured and tested at the beginning of 2008 in order to validate the resonator and the cryostat design before launching the serial production of the 6 remaining cryomodules. The paper presents the main results of this test and the cryomodule design in its final version.