4.4 Article

A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2019.04.060

关键词

Atomic hydrogen; Antihydrogen hyperfine structure; Magnetic resonance; Atomic beam

资金

  1. European Research Council under European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant [291242]
  2. Austrian Ministry of Science and Research, Austrian Science Fund (FWF) DK PI [W 1252]
  3. CERN fellowship, Switzerland
  4. DAAD RISE programme

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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.

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