A Cryogenic Supersonic Jet Target for Electron Scattering Experiments at MAGIX@MESA and MAMI

Abstract

High-performance cluster-jet targets are ideally suited and applied since years in hadron and laser plasma physics. Therefore, the forthcoming MAGIX experiment at the future energy recovering electron accelerator MESA will use a cluster-jet target to perform high precision measurements on electron scattering experiments, i.e., determination of the proton radius. For this purpose, a cluster-jet target was designed, built up and set successfully into operation at the University of Münster considering the requirements of the experimental setup of MAGIX. The details on these requirements, calculations to their realization, e.g., on the nozzle geometry and stagnation conditions of the target gas, their technical implementation and the features of the target which make the target a powerful state-of-the-art target, are highlighted in this publication. Furthermore, the measured and analysed jet beam characteristics from this target using a Mach Zehnder interferometer are presented and discussed. These are of highest interest for the final design of the complete experimental setup of MAGIX. Moreover, first measurements from commissioning beam times performed with the target installed at the already running MAinzer MIkrotron will be presented.

arXiv comment9 pages, 8 figures, submitted to Nucl. Instr. Meth. A

References in corpus (7)

• CODATA Recommended Values of the Fundamental Physical Constants: 2010
• CODATA Recommended Values of the Fundamental Physical Constants: 2014
• High-precision determination of the electric and magnetic form factors of the proton
• First measurement of proton's charge form factor at very low $Q^2$ with initial state radiation
• High density cluster jet target for storage ring experiments
• Determination of target thickness and luminosity from beam energy losses
• Two-dimensional visualization of cluster beams by microchannel plates

Cited by in corpus (8)

• The proton charge radius
• Isovector electromagnetic form factors of the nucleon from lattice QCD and the proton radius puzzle
• Operation and characterization of a windowless gas jet target in high-intensity electron beams
• Precision calculation of the electromagnetic radii of the proton and neutron from lattice QCD
• Electromagnetic form factors of the nucleon from $N_f=2+1$ lattice QCD
• Low-$Q^2$ elastic electron-proton scattering using a gas jet target
• A New Approach to Determine Radiative Capture Reaction Rates at Astrophysical Energies
• Production and manipulation of stable frozen hydrogen filaments