000349916 001__ 349916
000349916 005__ 20240311233442.0
000349916 037__ $$aGSI-2024-00516
000349916 041__ $$aEnglish
000349916 1001_ $$0P:(DE-HGF)0$$aEl-Kordy, Tarek Ahmed$$b0$$gmale
000349916 245__ $$aStorage Cell Tests for the Polarized Target at LHCb/CERN
000349916 260__ $$c2023
000349916 300__ $$a90p
000349916 3367_ $$2DataCite$$aOutput Types/Supervised Student Publication
000349916 3367_ $$02$$2EndNote$$aThesis
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000349916 3367_ $$0PUB:(DE-HGF)19$$2PUB:(DE-HGF)$$aMaster Thesis$$bmaster$$mmaster$$s1710150778_3201157
000349916 3367_ $$2ORCID$$aSUPERVISED_STUDENT_PUBLICATION
000349916 502__ $$aMasterarbeit, FH Aachen, 2023$$bMasterarbeit$$cFH Aachen$$d2023
000349916 520__ $$aThe gas injection system, referred to as the System for Measuring Overlap With Gas(SMOG2), used in the Large Hadron Collider beauty (LHCb) experiment at CERN,employs storage cells to provide gas targets for collision experiments. In the next stageof development, the LHCSpin project aims to establish a polarized atomic hydrogen gastarget through the utilization of an amorphous carbon-coated storage cell.At the Nuclear Physics Institute of the Jülich research center, an atomic beam sourcecapable of generating a polarized atomic hydrogen beam was available, along with aLamb-shift polarimeter capable of measuring the nuclear polarization of hydrogen atomsand molecules. These resources facilitated an in-depth exploration of the propertiesof such a storage cell, with a specific focus on assessing the recombination rate ofpolarized atoms and the polarization preservation on carbon surfaces. Additionally, anovel beam chopper design was introduced to investigate the impact of the Lyman-αradiation induced desorption recombination process.Results of mass spectrometry measurements, conducted using a Wien filter in combinationwith a Faraday cup, confirmed the absence of a dominant superficial water layer andrevealed the beam chopper’s limitations in effectively reducing atomic beam and photonintensity. Utilizing transition units alongside a spin filter, polarization measurementsfor atomic hydrogen showed a recombination rate ranging from 95.8% to 100% and amaximum vector polarization of −0.606 ± 0.002. In the case of molecular hydrogen,measurements indicated a maximum polarization of −0.54±0.01. The observed characteristicsalign with fit parameters derived from a mathematical model describing the lossof polarization due to surface interactions.These findings emphasize the feasibility of employing carbon-coated storage cells aswater-repellent, polarized molecular gas targets in accelerator experiments. Leveragingthe high-energy ion beam delivered by the Large Hadron Collider creates possibilitiesfor conducting spin physics experiments that were previously beyond reach.
000349916 536__ $$0G:(DE-HGF)POF4-612$$a612 - Cosmic Matter in the Laboratory (POF4-612)$$cPOF4-612$$fPOF IV$$x0
000349916 693__ $$0EXP:(DE-Ds200)External_experiment-20200803$$1EXP:(DE-Ds200)other-20200803$$5EXP:(DE-Ds200)External_experiment-20200803$$aother$$eExternal experiment at external facility/ no experiment at GSI (other)$$x0
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000349916 9131_ $$0G:(DE-HGF)POF4-612$$1G:(DE-HGF)POF4-610$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMatter and the Universe$$vCosmic Matter in the Laboratory$$x0
000349916 9141_ $$y2024
000349916 920__ $$lno
000349916 9201_ $$0I:(DE-Ds200)FFN-20210302OR452$$kFFN$$lFAIR Forschung NRW$$x0
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