Technical Design Report Super Fragment Separator

2.4 Super-FRS
DRAFT
2.4.1 System Design Status February 2008
The present technical design report of the Super-FRS has been continuously optimised and adapted
to the constraints of its technical realization, the discussions and collaborations with industry and
leading institutes worldwide. Ion-optical parameters, such as dimensions of magnets and drift
lengths have been selected to accommodate the specific target equipment and beam catchers required
for the full operating domain of the FAIR accelerator facilities. The experimental areas of
the Low- and High-Energy Branches have been reconsidered in more detail since the FAIR Baseline
Technical Report and are designed to enable the planning and construction of the corresponding
buildings which will be installed in the first phase of FAIR.
2.4.1.1 The Super-FRS in the FAIR Project
The Super-FRS will be the most powerful in-flight separator for exotic nuclei up to relativistic
energies. Rare isotopes of all elements up to uranium can be produced and spatially separated
within some hundred nanoseconds, thus very short-lived nuclei can be studied efficiently. The
Super-FRS is a large-acceptance superconducting fragment separator with three branches serving
different experimental areas including a new storage-ring complex. The new rare-isotope facility is
based on the experience and successful experimental program with the present FRS [1].
The Super-FRS magnetic system will consist of three branches connecting different experimental
areas, see Figure 2.4.1. Reaction studies under complete kinematics, similar to the present
ALADIN-LAND [2] setup, will be performed at the High-Energy Branch. Unique studies will be
performed in the Ring Branch consisting mainly of a collector ring CR, the NESR, RESR and an
electron nucleon collider (eA). Precision experiments with a brilliant electron-cooled exotic beam
including reaction studies with the atoms of an internal target will be done in the NESR. A novelty
will be electron scattering from exotic nuclei in the eA-collider section. The Low-Energy Branch
of the Super-FRS is mainly dedicated to precision experiments with energy-bunched beams
stopped in a gas cell. This branch is complementary to the ISOL (Isotope Separator On-Line)
facilities since all elements and short-lived isotopes can be studied.
The layout of the Super-FRS consists of magnets with Bρmax of 20 Tm. The increased maximum
magnetic rigidity compared with the FRS is determined by the goal to circumvent atomic
charge-changing collisions up to the heaviest projectile fragments. Although the CR is restricted to
13 Tm and the energy buncher to 7 Tm it is cost effective to apply the same type of magnetic
elements throughout the separator which allows in addition the use of an additional degrader at the
final achromatic focal plane, an option which is successfully applied at the present FRS.
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