Speakers
Description
The ISOLDE Superconducting Recoil Separator (ISRS) at CERN is a rotatable high-resolution spectrometer able to separate reaction fragments induced by HIE-ISOLDE beams, from the lightest to the heavies nuclear species, at collision energies up to 10 MeV/u. The injection of the ISOLDE beam into this ring requires a more compact bunch structure, so a Multi-Harmonic Buncher (MHB) device was designed for this task. The MHB will operate at a frequency of 10.128 MHz, which is a 10 % of the linac frequency, and would be installed before the RFQ. The MHB was designed as a two electrodes system, and the RF signal composed for the first four harmonics of the fundamental frequency, is fed into the electrodes. The system was first tested in the laboratory upto the nominal power conditions. Prior to delivery of MHB to its final location in ISOLDE, it will be tested with ion source beam at ESS-Bilbao with a β equal to 0.00328. In order to measure the functionality and characteristics of the produced bunches, a set of diagnostics were foreseen. To evaluate beam transmission a set ACCTs and a Faraday Cup were employed, a Wien filter to measure energy, and a Fast Faraday Cup (FFC) for bunch length measurement. The preparation of the experiment along with the results are presented in this contribution.
Funding Agency
Spain Government under grant agreement “Experiment ISRS-ISOLDE” (BOE-A-2023-16885), the “Recovery, Transformation, and Resilience Plan”, and the European Union program "NextGenerationEU"