A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer

Dec 17, 2018
11 pages
Published in:
  • Nucl.Instrum.Meth.A 935 (2019) 110-120
  • Published: Aug 11, 2019
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Abstract: (Elsevier)
The antihydrogen program of the ASACUSA collaboration at the antiproton decelerator of CERN focuses on Rabi-type measurements of the ground-state hyperfine splitting of antihydrogen for a test of the combined Charge–Parity–Time symmetry. The spectroscopy apparatus consists of a microwave cavity to drive hyperfine transitions and a superconducting sextupole magnet for quantum state analysis via Stern–Gerlach separation. However, the small production rates of antihydrogen forestall comprehensive performance studies on the spectroscopy apparatus. For this purpose a hydrogen source and detector have been developed which in conjunction with ASACUSA’s hyperfine spectroscopy equipment form a complete Rabi experiment. We report on the formation of a cooled, polarized, and time modulated beam of atomic hydrogen and its detection using a quadrupole mass spectrometer and a lock-in amplification scheme. In addition key features of ASACUSA’s hyperfine spectroscopy apparatus are discussed.
  • Atomic hydrogen
  • Antihydrogen hyperfine structure
  • Magnetic resonance
  • Atomic beam
  • hydrogen: polarized beam
  • hydrogen: particle source
  • particle source: design
  • beam: modulation
  • ground state: hyperfine structure
  • mass: spectrometer