Twin GEM-TPC Prototype (HGB4) Beam Test at GSI and Jyv\"askyl\"a - a Development for the Super-FRS at FAIR

TL;DR

This paper presents the development and testing of a twin GEM-TPC prototype designed for beam diagnostics at the Super-FRS separator of the FAIR facility, demonstrating its capabilities with various ion beams.

Contribution

The paper introduces a fourth-generation twin GEM-TPC prototype optimized for high-efficiency tracking and resolution in ion beam experiments, tested at GSI and Jyv"askyl"a accelerators.

Findings

Successful beam tests with protons, uranium, and carbon beams

High tracking efficiency and spatial resolution demonstrated

Prototype meets the requirements for Super-FRS diagnostics

Abstract

The FAIR[1] facility is an international accelerator centre for research with ion and antiproton beams. It is being built at Darmstadt, Germany as an extension to the current GSI research institute. One major part of the facility will be the Super-FRS[2] separator, which will be include in phase one of the project construction. The NUSTAR experiments will benefit from the Super-FRS, which will deliver an unprecedented range of radioactive ion beams (RIB). These experiments will use beams of different energies and characteristics in three different branches; the high-energy which utilizes the RIB at relativistic energies 300-1500 MeV/u as created in the production process, the low-energy branch aims to use beams in the range of 0-150 MeV/u whereas the ring branch will cool and store beams in the NESR ring. The main tasks for the Super-FRS beam diagnostics chambers will be for the set up and adjustment of the separator as well as to provide tracking and event-by-event particle identification. The Helsinki Institute of Physics, and the Detector Laboratory and Experimental Electronics at GSI are in a joint R&D of a GEM-TPC detector which could satisfy the requirements of such tracking detectors, in terms of tracking efficiency, space resolution, count rate capability and momenta resolution. The current prototype, which is the generation four of this type, is two GEM-TPCs in twin configuration inside the same vessel. This means that one of the GEM-TPC is flipped on the middle plane w.r.t. the other one. This chamber was tested at Jyv\"askyl\"a accelerator with protons projectiles and at GSI with Uranium, fragments and Carbon beams during this year 2016.