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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Instrumentation XIII
HK 51.4: Vortrag
Mittwoch, 13. März 2024, 18:15–18:30, HBR 19: C 2
Vacuum studies on the PANDA cluster-jet target considering flash evaporation and cluster bursting — •Michael Weide, Philipp Brand, Sophia Vestrick, and Alfons Khoukaz for the PANDA collaboration — Institut für Kernphysik, Universität Münster, 48149 Münster, Germany
In antiproton-proton annihilation experiments such as the upcoming PANDA experiment at FAIR, internal targets have a key role as they allow the accelerator beam to be utilized for multiple interactions with the target. Initially, this target will be realized by a cluster-jet target (CJT) operated with H2, that produces clusters of sizes ≤10 microns in diameter.
A challenge of such an experiment is minimizing background reactions due to the costly production of antiprotons, thus good vacuum conditions are mandatory. Residual gas sources in a CJT include flash evaporation, i.e., the evaporation of H2 due to thermal radiation and the pressure difference between the cluster and its surroundings, and cluster bursting, i.e., the burst of H2 during the interaction between the accelerator beam and a cluster.
To analyze the gas load caused by flash evaporation, a simulation software was developed that computes the outgassing rate per cluster size along the entire cluster-jet. Additionally, measurements at the Cooler Synchrotron (COSY) at FZ Jülich were performed, to study the accelerator beam induced pressure increase in the interaction chamber.
The research project was supported by BMBF (05P21PMFP1) and the EU’s Horizon 2020 program (824093).
Keywords: Cluster-jet target; Vacuum studies; Flash evaporation; Cluster bursting; Beam target interaction