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The axion haloscope is the currently most sensitive method to probe thevanishingly small coupling of this prominent Dark Matter candidate to photons.To scan a sizeable axion Dark Matter parameter space, the cavities that make upthe haloscope need to be tuned efficiently. In this article, we describe anovel technique to tune axion haloscopes around $8.4$ GHz in a purelymechanical manner without the use of dielectrics. We achieve tuning byintroducing a gap along the cavity geometry. Losses are added due to theleaking of the field out of the structure only if the gap becomes too largeconcerning the total width. A tuning range of around $600$ MHz is achieved,depending on the environmental conditions. We present the results of acorresponding prototype and outline prospects to further develop thistechnique.

Mechanical tuning of a rectangular axion haloscope operating around 8.4 GHz