Speaker
Description
The High Intensity and Energy ISOLDE (HIE-ISOLDE) enables the acceleration of medium to heavy radioactive isotopes at energies reaching 10 MeV per nucleon, a significant increase from the previous configuration limited to 2.8 MeV per nucleon. The journey towards this achievement involved a progressive deployment of radiofrequency cryo-modules starting in 2015. In 2018, the final configuration was reached with successful operation of four high-beta radiofrequency cryo-modules in series. This paper presents an overview of the operational results over the last 8 years, but especially focuses on the recent enhancements made in 2023 to the cryogenics system and tested during the last physics run. A comprehensive overhaul of the cryo-module operation process was implemented to minimize restart times following unexpected interruptions, to facilitate operator handling and to harden the process control structure. Hardware modifications have also been implemented to improve equipment availability and were successfully commissioned. The paper also introduces future upgrades studies towards improving the availability of the cryogenics system, based on tests performed in 2022 and 2023 out of the physics run, assessing the cavities warming time and temperature stabilization in degraded mode when only the shields were cooled with gaseous helium circulation between 80 and 90K.
| Submitters Country | Switzerland |
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