Design status of the vacuum system of IFMIF-DONES particle accelerator

The International Fusion Materials Irradiation Facility-DEMO Oriented Neutron Source (IFMIF-DONES) will be
an installation capable of qualifying materials for use in future fusion power reactors. To do so, a linear accel-
erator will deliver high-intensity deuteron beam to a liquid Li loop, creating a flow of neutrons that will produce
material damage equivalent to that expected in a fusion reactor. The vacuum system must maintain high vacuum
conditions during operation with high reliability. For this reason, a careful study of the vacuum has been assessed
and implemented in the accelerator project. Vacuum simulations have been performed in order to have a first
estimation of the expected pressure profile, and documentation is being produced to standardize the subsystem.
Additionally, valuable knowledge from the prototype installation, IFMIF/Engineering Design and Engineering
Validation Activities (EVEDA), is being taking into account in engineering design activities. Moreover, two
vacuum related prototypes are being manufactured; the Multipurpose Vacuum Accident Scenarios (MuVacAS)
prototype will enable experimental studies of air inrush in the last section of the accelerator; and the Quick
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Disconnecting System (QDS) prototype is being developed to study the feasibility of the remote handling of the
interface located between the accelerator beam line and the target chamber. The paper presents the status of the
design of the vacuum subsystem of the accelerator and discusses the future challenges.