Speakers
Description
The ISOLDE Solenoidal Spectrometer (ISS) is a new experimental station based on the second HIE-ISOLDE beam line. Based on the HELIOS concept developed at Argonne National Laboratory (ANL) [1], the experiment consists of a 4 T former MRI magnet and on-axis silicon detector array for the detection of light ions. Various ancillary devices are to be used for the coincident detection of recoil partners from the reaction, such as downstream silicon telescopes or gas-filled ionisation chambers.
ISS will exploit the wide range of radioactive ion beams available at ISOLDE providing a new opening the possibility to study new physics across the nuclear chart. Few-nucleon transfer reactions to investigate single-particle structure of nuclei are expected to be the workhorse experiments performed at ISS, while new techniques such as inelastic scattering and transfer-induced fission in inverse kinematics are proposed. The bore of the magnet can also be cleared to accept the SpecMAT active target chamber, on which a poster is also presented in this session.
The first two experiments using the device were performed during the 2018 campaign with the device being commissioned in the ISOLDE hall during 2017 and early 2018. For this first exploitation using (d,p) reactions on 28Mg [2] and 206Hg [3] beams, collaborators from ANL loaned their Si detector array and data acquisition in order to get the first results before CERN’s long shutdown 2 (LS2). This poster will present the status of commissioning of the bespoke on-axis Si array and the ionisation chambers for recoils and fission. These advances mean that ISS will be ready for a full physics programme after LS2 in a number of potential configurations, depending on the reaction to be studied. This poster will also present the benefits that will be provided by the EPIC project that could be exploited by ISS in the future, including potential upgrades to ISS itself.
The ISS core collaboration consists of the University of Liverpool, University of Manchester, STFC Daresbury Laboratory, KU Leuven and has received crucial support during the construction from Argonne National Laboratory and ISOLDE, CERN.
References
[1] J.C.Lighthall et al., Nuclear Instruments and Methods in Physics Research A622 (2010) 97.
[2] D.K.Sharp et al., CERN-INTC-2016-030
[3] B.P.Kay et al., CERN-INTC-2016-024