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The SPIDER experiment is aiming to test and optimize the full scale prototype of negative ion source for the ITER Heating Neutral Beam Injector, required to heat up ITER plasma with 16.5 MW injected power. The experiments started in May 2018 and are presently running, aiming to achieve the target parameters of 355A/m2 H2 and 285A/m2 D2 ion current density accelerated up to 110 kV for a pulse duration up to 1 h. The in-vessel actively cooled components of SPIDER experiment shall be drained and dried in case of major maintenance to limit as much as possible atmospheric corrosion inside the hydraulic circuits and components, to prevent water spreading, and to allow the execution of vacuum leak tests of the hydraulic circuits before re-installation inside the vacuum vessel. In particular drying of SPIDER Beam Source is needed for the beginning of SPIDER shutdown phase, scheduled in summer 2021. This paper presents the conceptual design of a dedicated drying system, tailored on the SPIDER Beam Source needs and requirements.
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