title: Design and commissioning of the RIKEN cryogenic electrostatic ring (RICE).
abstract: A new electrostatic ion storage ring, the RIKEN cryogenic electrostatic ring, has been commissioned with a 15-keV ion beam under cryogenic conditions. The ring was designed with a closed ion beam orbit of about 2.9 m, where the ion beam is guided entirely by electrostatic components. The vacuum chamber of the ring is cooled using a liquid-He-free cooling system to 4.2 K with a temperature difference of 0.4 K at most within all the positions measured by calibrated silicon diode sensors. The first cryogenic operation with a 15-keV Ne+beam was successfully performed in August 2014. During the measurement, the Ne+beam was stored under a ring temperature of 4.2 K with a residual-gas lifetime of more than 10 min. This permits an estimation of the residual gas density at a few 104cm-3, which corresponds to a room-temperature-equivalent pressure of around 1×10-10Pa. An effect of longitudinal pulse compression at the bunching cavity in the ring was clearly identified by monitoring the pick-up beam detector. The detailed design and mechanical structure of the storage ring, as well as the results from the commissioning run, are reported.
authors.affiliation: AMO Physics Laboratory, RIKEN, 351-0198 Saitama, Japan.
authors.forename: Y
authors.identifier: 0000000200816531
authors.initials: Y
authors.lastname: Nakano
authors.affiliation: AMO Physics Laboratory, RIKEN, 351-0198 Saitama, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Enomoto
authors.affiliation: AMO Physics Laboratory, RIKEN, 351-0198 Saitama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Masunaga
authors.affiliation: AMO Physics Laboratory, RIKEN, 351-0198 Saitama, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Menk
authors.affiliation: AMO Physics Laboratory, RIKEN, 351-0198 Saitama, Japan.
authors.forename: P
authors.initials: P
authors.lastname: Bertier
authors.affiliation: AMO Physics Laboratory, RIKEN, 351-0198 Saitama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Azuma