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Published Articles
Title	The ASACUSA CUSP: an antihydrogen experiment
Author(s)	Kuroda, N (Tokyo U., Komaba) ; Ulmer, S (Wako, RIKEN) ; Murtagh, D J (Wako, RIKEN) ; Gorp, S (Wako, RIKEN) ; Nagata, Y (Wako, RIKEN ; Tokyo U. of Agric. Tech.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Federmann, S (CERN) ; Leali, M (INFN, Brescia ; Brescia U.) ; Malbrunot, C (CERN) ; Mascagna, V (INFN, Brescia ; Brescia U.) ; Massiczek, O (Stefan Meyer Inst. Subatomare Phys.) ; Michishio, K (Tokyo U. of Sci.) ; Mizutani, T (Tokyo U., Komaba) ; Mohri, A (Kyoto U., HES Grad. Sch.) ; Nagahama, H (Tokyo U., Komaba) ; Ohtsuka, M (Tokyo U., Komaba) ; Radics, B (Wako, RIKEN) ; Sakurai, S (Hiroshima U.) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Suzuki, K (Stefan Meyer Inst. Subatomare Phys.) ; Tajima, M (Tokyo U., Komaba) ; Torii, H A (Tokyo U., Komaba) ; Venturelli, L (INFN, Brescia ; Brescia U.) ; Wünschek, B (Stefan Meyer Inst. Subatomare Phys.) ; Zmeskal, J (Stefan Meyer Inst. Subatomare Phys.) ; Zurlo, N (INFN, Brescia ; Brescia U.) ; Higaki, H (Hiroshima U.) ; Kanai, Y (Wako, RIKEN) ; Rizzini, E Lodi (INFN, Brescia ; Brescia U.) ; Nagashima, Y (Tokyo U. of Sci.) ; Matsuda, Y (Tokyo U., Komaba) ; Widmann, E (Stefan Meyer Inst. Subatomare Phys.) ; Yamazaki, Y (Wako, RIKEN)
Publication	2015
Number of pages	8
In:	Hyperfine Interact. 235 (2015) 13-20
DOI	10.1007/s10751-015-1205-1
Subject category	Accelerators and Storage Rings ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN AD ; ASACUSA AD-3
Abstract	In order to test CPT symmetry between antihydrogen and its counterpart hydrogen, the ASACUSA collaboration plans to perform high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen atom in-flight. We have developed an apparatus (“cusp trap”) which consists of a superconducting anti-Helmholtz coil and multiple ring electrodes. For the preparation of slow antiprotons and positrons, Penning-Malmberg type traps were utilized. The spectrometer line was positioned downstream of the cusp trap. At the end of the beamline, an antihydrogen beam detector was located, which comprises an inorganic Bismuth Germanium Oxide (BGO) single-crystal scintillator housed in a vacuum duct and surrounding plastic scintillators. A significant fraction of antihydrogen atoms flowing out the cusp trap were detected.

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