Total efficiency of an isotope-separator-on-line production system based on an electron cyclotron resonance ion source associated with a carbon target: The case of SPIRAL 1

Abstract

International audienceAn original approach to the time behavior of an isotope-separator-on-line production system is proposed in the case of a production system where the target and the ion source are connected through a conductance much larger than that of the exit hole of the source. One major goal of this article is to derive the analytical expression of the response time of the system for noble gases from statistical parameters only, which can be deduced from a few simple measurements. The validity limits of the expression of the total efficiency are given, and the calculations are compared to the results obtained at GANIL during operation of SPIRAL 1, using a carbon target close coupled to a multicharged electron cyclotron resonance ion source. The final analytical expression for the total efficiency shows that the usual product of diffusion efficiency, effusion efficiency, and ionization efficiency cannot be applied in our case. We show how it is possible to predict the atom-to-ion transformation efficiency for radioactive isotopes of noble gas using response times measured for stable isotopes

Acceleration of highly charged GeV Fe ions from a low-Z substrate by intense femtosecond laser

“…This would facilitate the measurement of the properties of the exotic nuclei (yet unknown) with the lifetime less than 100 ns, desired in nuclear physics and its applications. [48][49][50] V. CONCLUSION…”

“…The conventional charge breeding process is based on an electron beam ion source (EBIS) or electron cyclotron resonance (ECR), both of which require a long time ($100 ms) for achieving efficient charge breeding; in addition, there is a limitation on the achievable maximum charge state. 50 After the charge breeding process, the beam is post-accelerated for measurement or a secondary reaction. However, this long charge-breeding time significantly lowers the availability of useful short lived isotopes (<100 ms).…”