Jun 26 – 29, 2017
Schloss Waldthausen
Europe/Berlin timezone

The Design and Performance of the Münster Gas-Jet Target for MAGIX at MESA

Jun 27, 2017, 6:30 PM
1h 30m
Helmholtz-Institut Mainz

Helmholtz-Institut Mainz

Staudingerweg 18, 55128 Mainz
Board: 28


Mrs Silke Grieser (WWU Münster)


The experiments at the future electron accelerator MESA (Mainz Energy-recovering Superconducting Accelerator) at the University of Mainz focus on the validity of the Standard Model of particle physics. Thereby, the main interest is the search for dark photons as candidates for dark matter, and precision measurements of fundamental constants, such as the proton radius or the electroweak mixing angle. The MAGIX experiment (MESA Gas Internal target eXperiment) will be located in the energy-recovering sector of this future electron accelerator with energies up to 105 MeV, a beam current of 1 mA, and a high luminosity of $10^{35} \frac{1}{\mathrm{cm}^2 \mathrm{s}} $. MAGIX will consist of a multi-purpose spectrometer and a gas-jet target which was designed, built up, and set into operation at the University of Münster. The gas-jet beam is produced by the expansion of gas within Laval nozzles and provides constant thickness in time and space (e.g. $10^{19} \frac{\mathrm{atoms}}{\mathrm{cm}^2} $ directly behind the nozzle). By cooling and changing the pressure of the gas at the nozzle, the gas-jet target can also be operated in a cluster-jet mode. This offers the possibility to achieve a directed, less divergent beam even at large distances from the nozzle. Thereby, the highest thicknesses with a lower gas flow to improve the vacuum conditions can be achieved. Currently, measurements to characterize the target beam depending on different properties, e.g. different nozzle designs, different stagnation conditions of the gas in front of the nozzle, are performed. For this purpose, a Mach-Zehnder interferometer is used to determine the thickness distribution and the shape of the gas-jet. The design of the Münster gas-jet target and the beam properties will be presented and discussed.

Primary author

Mrs Silke Grieser (WWU Münster)


Prof. Alfons Khoukaz (University Münster) Mrs Ann-Katrin Hergemöller (WWU Münster) Mr Benjamin Hetz (WWU Münster) Mrs Catharina Hargens (WWU) Mrs Christina Westphälinger (WWU) Mr Daniel Bonaventura (Uni Muenster) Mr Lukas Lessmann (WWU)

Presentation materials