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Concept Design Studies of the REX-ISOLDE Cryomodules at CERN

V. Parma, S. Calatroni, N. Delruelle, C. Maglioni, M. Modena, Matteo Pasini, P. Trilhe, Jan Hansen, Shrikant Pattalwar

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Abstract

The High Intensity and Energy (HIE) proposal plans a major upgrade of the existing ISOLDE and REXISOLDE facilities at CERN, with the objective of substantially increasing the energy and the intensity of the delivered radioactive ion beams. In the frame of this upgrade activity, a superconducting linac, based on Nb sputtered Quarter Wave Resonators (QWRs) is proposed to be installed downstream the existing normal conducting machine. The present design of the accelerator lattice features housing of five high-beta cavities (beta=10.3%) and a superconducting solenoid in a common cryomodule. In most of the existing low-energy heavy-ion installations worldwide, insulation and beam vacuum are in common, with the risk of cavity surface contamination in case of accidental leak of the cryostat vessel. Following a concept study, we report in this paper on three design options, namely cryo-modules with single vacuum, with separate or with hybrid vacuum systems (the latter having a low conductance between insulation and beam vacuum) and compare them in terms of technical complexity, performance, reliability and maintainability

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What this paper is about

The High Intensity and Energy (HIE) proposal plans a major upgrade of the existing ISOLDE and REXISOLDE facilities at CERN, with the objective of substantially increasing the energy and the intensity of the delivered radioactive ion beams. In the frame of this upgrade activity, a superconducting linac, based on Nb sputtered Quarter Wave Resonators (QWRs) is proposed to be installed downstream the existing normal conducting machine. The present design of the accelerator lattice features housing of five high-beta cavities (beta=10.3%) and a superconducting solenoid in a common cryomodule. In most of the existing low-energy heavy-ion installations worldwide, insulation and beam vacuum are in common, with the risk of cavity surface contamination in case of accidental leak of the cryostat vessel. Following a concept study, we report in this paper on three design options, namely cryo-modules with single vacuum, with separate or with hybrid vacuum systems (the latter having a low conductance between insulation and beam vacuum) and compare them in terms of technical complexity, performance, reliability and maintainability

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Available abstract

The High Intensity and Energy (HIE) proposal plans a major upgrade of the existing ISOLDE and REXISOLDE facilities at CERN, with the objective of substantially increasing the energy and the intensity of the delivered radioactive ion beams. In the frame of this upgrade activity, a superconducting linac, based on Nb sputtered Quarter Wave Resonators (QWRs) is proposed to be installed downstream the existing normal conducting machine. The present design of the accelerator lattice features housing of five high-beta cavities (beta=10.3%) and a superconducting solenoid in a common cryomodule. In most of the existing low-energy heavy-ion installations worldwide, insulation and beam vacuum are in common, with the risk of cavity surface contamination in case of accidental leak of the cryostat vessel. Following a concept study, we report in this paper on three design options, namely cryo-modules with single vacuum, with separate or with hybrid vacuum systems (the latter having a low conductance between insulation and beam vacuum) and compare them in terms of technical complexity, performance, reliability and maintainability

Key concepts: Upgrade, Large Hadron Collider, Cryostat, Nuclear engineering, Linear particle accelerator, Nuclear physics, Engineering, Physics

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