Cryogenic tunable microwave cavity at 13 GHz for hyperfine spectroscopy of antiprotonic helium

J. Sakaguchi, H. Gilg, R. S. Hayano, T. Ishikawa, K. Suzuki, E. Widmann, H. Yamaguchi, F. Caspers, J. Eades, M. Hori, D. Barna, D. Horváth, B. Juhász, H. A. Torii, T. Yamazaki

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Abstract

For the precise measurement of the hyperfine structure of antiprotonic helium, microwave radiation of 12.9 GHz frequency is needed, tunable over ±100 MHz. A cylindrical microwave cavity is used whose front and rear faces are meshed to allow the antiprotons and laser beams to enter. The cavity is embedded in a cryogenic helium gas target. Frequency tuning of ∼300 MHz with Q values of 2700-3000 was achieved using over-coupling and an external triple stub tuner. We also present Monte-Carlo simulations of the stopping distribution of antiprotons in the low-density helium gas using the GEANT4 package with modified energy loss routines.

Original languageEnglish
Pages (from-to)598-611
Number of pages14
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume533
Issue number3
DOIs
Publication statusPublished - Nov 11 2004

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Keywords

  • Antiprotonic helium
  • Cryogenic tunable microwave cavity
  • Hyperfine spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

Sakaguchi, J., Gilg, H., Hayano, R. S., Ishikawa, T., Suzuki, K., Widmann, E., Yamaguchi, H., Caspers, F., Eades, J., Hori, M., Barna, D., Horváth, D., Juhász, B., Torii, H. A., & Yamazaki, T. (2004). Cryogenic tunable microwave cavity at 13 GHz for hyperfine spectroscopy of antiprotonic helium. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 533(3), 598-611. https://doi.org/10.1016/j.nima.2004.06.144