Speaker
Anna Gustafsson
(CERN)
Description
Over the last few years the low-energy part of REX, consisting of a Penning trap and Electron beam ion source, has developed from a pure bunching and charge-breeding system to an elaborate set of tools that can be used for different purposes. For instance, half-life determination of 38Ca directly after the trap by making use of the molecular beam cleaning method, as well as providing single charged ions to the WITCH setup have already been reported on.
With the arrival and successful commissioning of the ISOLDE RFQ cooler REX has now the possibility to take either CW or pulsed beams from ISOLDE, and to use or shoot through the REXTRAP. The tests have only commenced, but already now we can present the first very encouraging results of pulsed injection from the RFQ cooler. This allowed us to implement the mass-selective method in the trap while maintaining a high overall efficiency for REX.
This year we've also demonstrated that the low energy system, particularly the EBIS, can be used for in-trap decays. That means also elements that are normally difficult to extract from the ISOLDE target-ion source (e.g. refractory elements such as Fe) can be delivered to the experiments by letting the straightforwardly produced mother-nuclei decay in the EBIS before being accelerated. Furthermore, injection tests into the REXTRAP confirms that beams from the MINIMONO ECRIS coupled to an ISOLDE target can be accommodated with a high efficiency, which gives access to a number of otherwise difficultly produced beams, for instance C.
Finally, tests have shown that elements up to at least K (Z=19) can be can stripped to hydrogen-like electron configuration. This, in combination with the proposed beam-line design connecting the REX mass separator to the WITCH experiment, will open up the possibility for exciting studies of few-electron systems.
Author
Anna Gustafsson
(CERN)
Co-author
. REX-team
(CERN)
