A method to measure the transition energy γt of the isochronously tuned storage ring

Characterization of a double Time-Of-Flight detector system for accurate velocity measurement in a storage ring using laser beams

“…The goal [46,47] of the velocity measurement is to reach a precision of σ (v)/v ≈ 2 × 10 −5 , wherev is the mean velocity owing to the fact that the velocity of the stored ions is gradually reduced due to energy loss in the TOF detectors. With this precision, we hope to reach a maximum mass resolving power of R ≈ 8 × 10 5 (1σ ) assuming σ (γ t )/γ t ≈ 1 × 10 −4 could be reached in the data analysis [50] while the acceptance of σ (Bρ)/(Bρ) ≈ 8.5 × 10 −4 was preserved in CSRe. The time precision σ (t) is limited by the time-resolution of the TOF detector which is about 18.5 ps [37] and can be statistically improved by measuring t for more than one time (recording timing signals for hundreds of revolutions) for each ion.…”

“…The goal [46,47] of the velocity measurement is to reach a precision of σ ( v)/ v ≈ 2 × 10 −5 , where v is the mean velocity owing to the fact that the velocity of the stored ions is gradually reduced due to energy loss in the TOF detectors. With this precision, we hope to reach a maximum mass resolving power of R ≈ 8 × 10 5 (1σ ) assuming σ (γ t )/γ t ≈ 1 × 10 −4 could be reached in the data analysis [50] while the acceptance of σ (Bρ)/(Bρ) ≈ 8.5 × 10 −4 was preserved in CSRe.…”

“…1), new ion optics of the ring with zero dispersion at the two TOF detectors and proper γ t -value and Bρ-acceptance have been established for CSRe [49]. Note that with the velocity information obtained in IMS, the γ t of the ring as a function of orbital length has been deduced in a straightforward way [49,50]. Therefore, with both v and T measured, the achievable mass resolving power R will no longer be limited by the physical acceptance of the ring but by the precision of the velocity measurement of each stored ion (see last term in Eq.…”

Heavy-ion storage rings and their use in precision experiments with highly charged ions

“…The first experiments addressing neutrondeficient 78 Kr [165] and neutron-rich 86 Kr projectile fragments were performed and data analysis is in progress. In addition to nuclear mass measurements, the information from two ToF detectors can be used for accelerator-based investigations of the CSRe, see, for example, [179,180].…”