| Article | |
| Title | Amorphous carbon-coated storage cell tests for the polarized gas target at LHCb |
| Author(s) | El-Kordy, T (ZAT, Julich ; Darmstadt, GSI ; Aachen, Tech. Hochsch.) ; Costa Pinto, P (CERN) ; Di Nezza, P (Frascati) ; Engels, R (ZAT, Julich ; Darmstadt, GSI) ; Ferro-Luzzi, M (CERN) ; Faatz, N (ZAT, Julich ; Darmstadt, GSI ; Aachen, Tech. Hochsch.) ; Grigoryev, K (Darmstadt, GSI) ; Kannis, C (Heinrich Heine U., Dusseldorf) ; Pütz, S (Darmstadt, GSI ; Cologne U.) ; Sharma, H (Darmstadt, GSI ; Aachen, Tech. Hochsch.) ; Verhoeven, V (Darmstadt, GSI ; Cologne U.) |
| Publication | 2024 |
| Number of pages | 9 |
| In: | Nucl. Instrum. Methods Phys. Res., A 1068 (2024) 169707 |
| DOI | 10.1016/j.nima.2024.169707 (publication) |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; LHCb |
| Abstract | The LHC beams cannot be polarized. Hence, the implementation of a dense polarized gas target at the LHCb experiment at CERN, to be operated simultaneously with beam–beam collisions, will enable high-energy fixed target interactions to explore a range of spin physics measurements. Using an atomic beam source at the Forschungszentrum Jülich to provide a polarized atomic hydrogen beam, we investigated the properties of a storage cell coated with amorphous carbon. A notable recombination rate, lying between 93 and 100%, and a preservation of polarization during recombination exceeding 74% was observed. We were able to generate H2 molecules with a nuclear polarization of −0.59. Remarkably, no water layer accumulated on the cooled storage cell surface, even over extended periods. Furthermore, we examined the influence of Lyman-α radiation on the recombination rate on carbon, addressing a prominent question in the field of astrophysics. |
| Copyright/License | publication: © 2024-2025 The Authors (License: CC BY 4.0) |
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Record creato 2024-10-08, modificato l'ultima volta il 2025-04-07
