@article {83, title = {Antihydrogen Synthesis in a Double-Cusp Trap}, journal = {JPS Conf. Proc.}, volume = {18}, year = {2017}, pages = {011009}, doi = {10.7566/JPSCP.18.011009}, author = {Naofumi Kuroda and Minori Tajima and Balint Radics and Pierre Dupre and Yugo Nagata and Chikato Kaga and Yasuyuki Kanai and Marco Leali and Evandro Lodi Rizzini and Valerio Mascagna and Takuya Matsudate and Horst Breuker and Hiroyuki Higaki and Yasuyuki Matsuda and Stefan Ulmer and Luca Venturelli and Yasunori Yamazaki} } @article {82, title = {Manipulation and Transport of Antiprotons for an Efficient Production of Antihydrogen Atoms}, journal = {JPS Conf. Proc.}, volume = {18}, year = {2017}, pages = {011008}, doi = {10.7566/JPSCP.18.011008}, author = {Minori Tajima and Naofumi Kuroda and Pierre Dupre and Yugo Nagata and Balint Radics and Takuya Matsudate and Marco Leali and Valerio Mascagna and Luca Venturelli and Horst Breuker and Hiroyuki Higaki and Yasuyuki Kanai and Evandro Lodi Rizzini and Yasuyuki Matsuda and Stefan Ulmer and Yasunori Yamazaki} } @article {69, title = {カスプトラップを用いた反水素研究}, journal = {陽電子科学}, volume = {4}, year = {2015}, month = {Feb.}, pages = {49-59}, chapter = {49}, abstract = {

In this review, we describe a planned experiment of the Atomic Spectroscopy And Collisions Using Slow Antiprotons (ASACUSA) collaboration at CERN to test CPT symmetry via atomic beam spectroscopy of the ground-state hyperfine splitting of antihydrogen using a cusp trap. The cusp trap which consists of a superconducting anti-Helmholtz coil and a stack of ring electrodes, is expected to produce a spin-polarized antihydrogen beam. Recently, the ASACUSA collaboration succeeded in producing antihydrogen atoms in the cusp trap and extracting an antihydrogen beam. This paves the way towards precision in-flight spectroscopy of the antihydrogen atom.

}, keywords = {Antihydrogen, ASACUSA, Atomic beam, CPT symmetry, cusp trap, non-neutral plasma}, author = {Yugo Nagata and Naofumi Kuroda} } @article {31, title = {Atomic collision and spectroscopy experiments with ultra-low-energy antiprotons}, journal = {Journal of Physics: Conference Series}, volume = {185}, year = {2009}, pages = {012049}, abstract = {

Antiproton, the antiparticle of proton, is a unique projectile in the study of atomic collision physics, which can be treated theoretically either as a {\textquoteright}negative proton{\textquoteright} or a {\textquoteright}heavy electron{\textquoteright}. Atomic capture of an antiproton will result in formation of a highly excited exotic atom. Antiprotonic helium atom has been studied intensively by means of precision laser spectroscopy, which has led to a stringent determination of antiproton mass and charge to a level of ppb. Comparison of these values with those of proton gives one of the best tests of CPT invariance, the most fundamental symmetry in physics. However, the dynamic processes of antiproton capture remain unclarified. With an aim to produce an antiproton beam at atomic-physics energies for {\textquoteright}pure{\textquoteright} collision experiments, we have so far developed techniques to decelerate, cool and confine antiprotons in vacuo, using a sequential combination of the Antiproton Decelerator (AD) at CERN, a Radio-Frequency Quadrupole Decelerator (RFQD), and an electromagnetic trap. Our recent success in stable extraction of monoenergetic ultra-slow antiprotons, about 3 {\texttimes} 10 5 in number available every 5 minutes, has opened up the possibility to study ionization and atomic capture processes between an antiproton and an atom under the single collision condition. Our design and strategy of the cross-beam experiments are presented, together with technical challenges in the detection system to identify the rare events with a reaction rate of 10 -4 .

}, url = {http://stacks.iop.org/1742-6596/185/i=1/a=012049}, author = {Torii, H.A. and Yugo Nagata and Hiroshi Toyoda and Hiroshi Imao and Naofumi Kuroda and Victor L Varentsov and Yasunori Yamazaki and Asacusa collaboration} }