FAIR is an international accelerator-based research facility for nuclear and particle physics being built at Darmstadt in Germany. It uses high-energy ion beams to study matter under extreme conditions — the kind of states that exist inside stars or in the moments after cosmic events, and which cannot be produced by ordinary laboratory means. The Super Fragment Separator is one of its major experimental systems, and its role is to sort the fragments produced when a heavy-ion beam strikes a target, isolating short-lived radioactive nuclei for study. The beam catcher sits within this system and performs the demanding task of stopping what remains of the primary beam after the useful fragments have been separated out.

Two facts about India's role are the most exam-relevant. First, India became a founding member of FAIR on 4 October 2010 by signing an international convention at Wiesbaden, Germany, and it is the only non-European shareholder in FAIR GmbH — an unusual position for India in a large European scientific consortium. Second, the funding arrangement is a 50:50 split between the Department of Science and Technology and the Department of Atomic Energy, which is why both departments appear in questions on this project. The engineering itself is a demonstration of indigenous capability in a niche field: absorbing 29 kJ in a pulse of 50 to 100 nanoseconds, at peak energy densities of 300 J/g, requires materials and cooling design that few facilities in the world need to attempt.