Speaker
Description
The CERN HIE-ISOLDE facility accelerates a unique worldwide variety of radioactive ions up to collision energies close to 10 MeV/A. The physics program encompasses a broad range of nuclear structure studies, from shell evolution to nuclear astrophysics. To fully profit from the new facility, our collaboration has proposed the construction of the “Superconducting Recoil Separator” ISRS will extend the HIE-ISOLDE physics program by in-beam and focal-plane particle-gamma correlation studies. The design of ISRS is based on an array of superconducting multifunction magnets (Canted Cosine Theta, CCT), integrated into a compact FFAG particle storage ring. A/Q analysis of reaction fragments is achieved by combining cyclotron frequency and RF extraction with ToF and PID at the focal plane
One of the key elements of the ISRS spectrometer is the prototype of the magnet “MAGDEM” (MAGnet DEMonstrator), the basic building block of the ISRS particle storage ring. MAGDEM
is an extremely compact, helium-free Nb-Ti CCT superconducting magnet cooled by a single GM cryocooler that incorporates the nested quadrupole and dipole functions. The cryostat features a 200 mm clear aperture for the circulation of the heavy ion fragments, and it is only ~750 mm long. The innovative design incorporates a dipole coil (2.3 T) inside a quadrupole coil (10 T/m), providing the 36-degree bend needed for ion analysis/storage in the ISRS ring
The ISLS (Isolde Superconducting Linear Spectrometer) is a magnetic system that integrates MAGDEM into an optical system to perform nuclear reactions to prove its performance and test beam dynamics simulations. The system also incorporates the reaction chamber, focusing systems, and focal plane detectors. The design goals for the ISLS are a high transmission (ideally close to 100%), a compact configuration (must fit in the of XT03 at HIE-ISOLDE) and a high mass dispersion to optimize separation of isotopes.
The ion-optical codes BMAD, GICOSY, and COSY INFINITY were used for the baseline design. The phase space dimensionality used was x-a (horizontal) and y-b (vertical), while δm-δE and δP are calculated as parameters. The focusing condition at the final focal plane is (x,a)=(y,b)=0: point-to-pint in x, and y The designed lattice of the ISLS will consist of a set of two quadrupole magnets (Q) and MADGEM (M) with a configuration QMQ. This symmetric design helps to minimize aberrations in a compact configuration while reaching a mass and energy dispersion ≈0.6 cm/% and a momentum dispersion of 1.2 cm/%. which allows to reach
Tests with stable and radioactive beams are foreseen after LS3 to prove the performance of the magnet against the beam dynamics of ISRS for a range of isotopes and energies. Calculated performances expected for the ISLS will be presented for the reactions 19Ne + d → n + 20Na 19Ne + d → p + 20Ne of interest in nuclear astrophysics.
| Email address | teresa.kurtukian@csic.es |
|---|---|
| Funding Agency | AEI Spain PID2023-147569NB-C21, PRTR Spain, Next Generation EU CIE2023-01-005 |
| Classification | Ion optics and spectrometers |
