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Magnetic rigidity

Particle identification at the Super-FRS will be achieved by using precise tracking detectors to measure positions and angles at the focus. Due to the high-resolution achromatic mode of the Super-FRS, highly homogeneous transmission tracking detectors are crucial to tag the momentum of the ion/fragment beam.

A GEM-TPC detector, whose design combines two major concepts in modern gas-filled detectors, the Time Projection Chamber (TPC) and the Gas Electron Multiplication (GEM), is suggested as high-rate capable  tracking detectors. Three detector generations (prototypes) have been constructed and tested in 2011, 2012 and 2014 with relativistic ion beams. The latest prototype, shown below, has a twin configuration, i.e. two GEM-TPC detectors flipped (with the electric fields of the two field cages in opposite directions) in one housing box, to allow for higher tracking efficiency. The GEMEX1c electronics was used to test it [1].

[1] F. Garcia et al. GSI Scientific Report (2014) p. 140


Twin GEM-TPC detector prototype (October 2014).
Figure 1: Twin GEM-TPC detector prototype (October 2014).

In 2016 the new digital readout electronics GMX, based on NYXOR+DNF boards, was tested with with beam.

NYXOR and DNF boards
Figure 2: NYXOR and DNF boards

Partners: Helsinki IP, Jyvaskyla Uni and GSI.