Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Instrumentation XII

HK 51.2: Talk

Thursday, March 30, 2017, 17:00–17:15, F 072

Developments for the Super-FRS Ion Catcher at the Low-Energy Branch at FAIR — •Ivan Miskun for the FRS Ion Catcher collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Gießen, Germany

At the Low-Energy Branch (LEB) of the Super-FRS at FAIR exotic nuclei will be produced at relativistic energies, separated in-flight, stopped and thermalized in cryogenic gas-filled stopping cell (CSC), and delivered to the high precision experiments MATS and LaSpec. The prototype of this CSC has been developed and successfully commissioned as part of the FRS Ion Catcher experiment at GSI. It provides areal densities up to ∼ 6.3 mg/cm² with total efficiencies of ∼ 30 %. Short extraction times of ∼ 25 ms and high rate capabilities (10⁴ ions of interest per second without efficiency losses) enable an access to very exotic and short-lived nuclei.

Furthermore, the design of a next-generation CSC for the LEB has been developed. The new design will incorporate a number of novel concepts, which will provide significant further improvement of the performance parameters (5 times faster extraction times, 5 times higher areal densities, three orders of magnitude higher rate capabilities, etc.). As part of the design studies for this new CSC the operation of stopping cell at extremely high electrical field strengths has been tested with the present prototype. Also, the use of collision-induced dissociation in the RFQ beamline for the breakup of adducts and as an additional separation method has been investigated.