ESS Docs Document 345-v1

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The HIE-Isolde superconducting linac: an integrated cryogenic and insulation vacuum

Document #:
ESS-doc-345-v1
Document type:
Presentation Slides
Submitted by:
Georg Hulla
Updated by:
Georg Hulla
Document Created:
28 Oct 2014, 17:49
Contents Revised:
28 Oct 2014, 17:49
DB Info Revised:
28 Oct 2014, 17:49
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Abstract:
The High Intensity and Energy Isolde (HIE-Isolde) project aims at increasing the energy and intensity of the radioactive ion beams (RIB) delivered by the present Rex-Isolde facility. Energy up to 10MeV/amu will be reached by a new post-accelerating, superconducting (SC) linac. Beam will be delivered via a HEBT to three experimental stations for nuclear physics. To keep the SC linac compact and avoid cold-warm transitions, the cryomodules feature a common beam and insulation vacuum, imposing the severe cleanliness standard of RF cavities to the whole cryostat. Radioactive ion beams require a hermetically sealed vacuum, with transfer of the effluents to the nuclear ventilation chimney. Hermetically sealed, dry, gas transfer vacuum pumps are preferred to gas binding pumps, for an optimized management of radioactive contamination risk during maintenance and intervention. Rough pumping is distributed, while the HEBT turbomolecular pumps also share a common backing line. Slow pumpdown and ventilation of the cryomodules are studied to avoid particulate movement in the viscous regime. The vacuum system of the SC-linac is isolated by two fast valves, triggered by fast reacting cold cathode gauges installed on the warm linac, the HEBT and the experimental stations. To evaluate the leak propagation velocity as a function of leak size and geometry of the lines, a computational and experimental investigation is being carried out in the VSC group.
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Keywords:
HIE-ISOLDE vacuum
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