A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer
/ Authors
C. Malbrunot, M. Diermaier, M. Simon, C. Amsler, S. A. Cuendis, H. Breuker, C. Evans, M. Fleck, B. Kolbinger, A. Lanz
and 12 more authors
M. Leali, V. Maeckel, V. Mascagna, O. Massiczek, Y. Matsuda, Y. Nagata, C. Sauerzopf, L. Venturelli, E. Widmann, M. Wiesinger, Y. Yamazaki, J. Zmeskal
/ Abstract
Abstract 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.
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment