Current status of the cryogenic trap for fast ion beams and the cryogenic storage ring

A Cryogenic electrostatic Trap for Fast ion beams (CTF) is being built to develop the technology and techniques necessary to construct the Cryogenic Storage Ring (CSR) for heavy ions in Heidelberg. In both devices, the electrodes and the vacuum chambers they are housed in will be cooled to temperatures between 2-10 K in order to reduce thermal radiation transfer to the stored ions, thereby allowing radiative cooling of molecular ions to the rovibrational ground state. Additionally, storage times on the order of minutes will be made possible by the reduced residual gas pressure in the cryogenic beam pipe (around 10-15 mbar). Following commission, the CTF will allow the testing of cryogenic electrostatic ion trapping in extreme vacuum and the development and evaluation of beam diagnostics and particle detectors in a temperature range between 2 and 600 K for the CSR. The techniques employed in the CTF include, for example, the precise, low-thermal-conduction wire suspension of the cold inner vacuum chamber and its in-situ bakeout for minimal gas pressure, and the passage and thermal anchoring of all electrical connections and mechanical actuators through the two layers of thermal shields in the isolation vacuum. The current status of both devices is presented