Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
Q 46.4: Vortrag
Mittwoch, 12. März 2025, 15:15–15:30, KlHS Mathe
Characterizing tungsten emissivity and temperature stability of an atomic beam source for the Project 8 Experiment — •Brunilda Mucogllava1, Martin Fertl1, and Marco Röllig2 for the KAMATE collaboration — 1Johannes Gutenberg University Mainz — 2Tritium Laboratory Karlsruhe
The Project 8 experiment seeks to make a neutrino-mass measurement with a sensitivity of 40 meV/c2 using cyclotron radiation emission spectroscopy of beta decay electrons from an atomic tritium source. To enable safe initial R&D, a Hydrogen Atom Beam Source (HABS) is used at the JGU Mainz test stand, where molecular hydrogen is dissociated inside a 1 mm tungsten capillary heated radiatively to 2300 K by a tungsten filament. The efficiency of dissociation is closely tied to the capillary's surface temperature, which depends on its thermal properties. The aging of both the tungsten filament and capillary alters their surface resistivity and emissivity, affecting the achievable temperature and complicating absolute temperature measurements. To address this, a calibration setup at the Tritium Laboratory Karlsruhe (TLK) was developed to measure tungsten emissivity using a near-infrared spectrometer and a single wavelength pyrometer. This talk will present findings on tungsten emissivity modeling and HABS temperature measurements, addressing challenges in device calibration, ultra-high vacuum conditions, and temperature stability.
Keywords: neutrino physics; atomic hydrogen beam; temperature measurement; infrared spectroscopy; tungsten emissivity