The High Intensity and Energy Upgrade Project at ISOLDE, CERN
- Matthew Fraser, European Center for Nuclear Research (CERN)
Thursday, April 24, 9:00 AM - Special Seminar
NSCL Seminar Room
The High Intensity and Energy (HIE) upgrade of the ISOLDE facility aims to increase the energy, intensity, and quality of post-accelerated radioactive ion beams (RIBs) produced at CERN. The R&D effort in recent years has been split between an upgrade of the Radioactive ion beam EXperiment (REX) post-accelerator with a 40 MV superconducting linac and ongoing developments to increase the intensity and quality of RIBs produced at the facility with target/ion source upgrades to accept an increase of the driverís beam power. The talk will give an overview of the ISOLDE facility, the HIE-ISOLDE project and the ongoing post-accelerator upgrade, focusing on the beam dynamics design of the superconducting linac that will boost the energy of RIBs to over 10 MeV/u. The plan is to add cryomodules, employing Nb-sputtered accelerating cavities, sequentially to the REX beam line over the coming years, with the first module to be installed early in 2015. A recent request from the facilityís users for a factor of 10 increase in the bunch spacing of post-accelerated RIBs has been investigated to permit time-of-flight particle identification and background suppression techniques to be used by the experiments. An engineering design request has been incorporated into the project to provide an optional 10.128 MHz bunch frequency (as opposed to 101.28 MHz delivered today) in the final stage of the upgrade when most of the existing accelerator is replaced in 2018. The design study for retrofitting the existing RFQ at REX with an external pre-buncher will also be discussed.