Title of article
Cryogenic tunable microwave cavity at 13 GHz for hyperfine spectroscopy of antiprotonic helium
Author/Authors
Sakaguchi، نويسنده , , J. and Gilg، نويسنده , , H. and Hayano، نويسنده , , R.S and Ishikawa، نويسنده , , T. and Suzuki، نويسنده , , K. and Widmann، نويسنده , , E. and Yamaguchi، نويسنده , , H. and Caspers، نويسنده , , F. and Eades، نويسنده , , J. and Hori، نويسنده , , M. and Barna، نويسنده , , D. and Horvلth، نويسنده , , D. and Juhلsz، نويسنده , , B. and Torii، نويسنده , , H.A. and Yamazaki، نويسنده , , T.، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2004
Pages
14
From page
598
To page
611
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.
Keywords
Cryogenic tunable microwave cavity , Antiprotonic helium , Hyperfine spectroscopy
Journal title
Nuclear Instruments and Methods in Physics Research Section A
Serial Year
2004
Journal title
Nuclear Instruments and Methods in Physics Research Section A
Record number
2198495
Link To Document