In recent years runaway electron physics has been extensively studied at the COMPASS tokamak with the emphasis on generation and mitigation of runaway electron beams. Due to improved plasma position feedback [1] runaway beams can be regularly sustained for sufficient durations in order to study its properties. This contribution reports the progress in the preparation of experiments to study the interaction of runaway electrons with solid state materials and mitigation of runaway electron beams by pellet injection. To do so, a room temperature solid state pellet injector was employed originally developed for the ASDEX Upgrade tokamak [2]. An overview of the experimental setup and experimental plans will be provided. The main aim of this contribution is to present technical aspects of the experiment and the design of vacuum system for achieving successful pellet injector operation. $[1]$ Ficker, O., et al. Runaway electron beam stability and decay in COMPASS. Nuclear Fusion, 2019. \ $[2]$ Höpfl, N., Modification and characterisation of ASDEX Upgrade's room-temperature solid-state pellet injector for the use on COMPASS. IPP Report, 2019.