@article {92, title = {Antiproton beams with low energy spread for antihydrogen production}, journal = {Journal of Instrumentation}, volume = {14}, year = {2019}, month = {05/2019}, pages = {P05009{\textendash}P05009}, abstract = {

A low energy antiproton transport from the ASACUSA{\textquoteright}s antiproton accumulation trap (MUSASHI trap) to the antihydrogen production trap (double cusp trap) is developed. The longitudinal antiproton energy spread after the transport line is 0.23{\textpm}0.02 eV, compared with 15 eV with a previous method used in 2012. This reduction is achieved by an adiabatic transport beamline with several pulse-driven coaxial coils. Antihydrogen atoms are synthesized by directly injecting the antiprotons into a positron plasma, resulting in the higher production rate.

}, doi = {10.1088/1748-0221/14/05/p05009}, url = {https://doi.org/10.1088\%2F1748-0221\%2F14\%2F05\%2Fp05009}, author = {M. Tajima and N. Kuroda and C. Amsler and H. Breuker and C. Evans and M. Fleck and A. Gligorova and H. Higaki and Y. Kanai and B. Kolbinger and A. Lanz and M. Leali and V. M{\"a}ckel and C. Malbrunot and V. Mascagna and Y. Matsuda and D. Murtagh and Y. Nagata and A. Nanda and B. Radics and M. Simon and S. Ulmer and L. Venturelli and E. Widmann and M. Wiesinger and Y. Yamazaki} } @article {91, title = {Hyperfine spectroscopy of hydrogen and antihydrogen in ASACUSA}, journal = {Hyperfine Interactions}, volume = {240}, year = {2018}, month = {Dec}, pages = {5}, abstract = {

The ASACUSA collaboration at the Antiproton Decelerator of CERN aims at a precise measurement of the antihydrogen ground-state hyperfine structure as a test of the fundamental CPT symmetry. A beam of antihydrogen atoms is formed in a CUSP trap, undergoes Rabi-type spectroscopy and is detected downstream in a dedicated antihydrogen detector. In parallel measurements using a polarized hydrogen beam are being performed to commission the spectroscopy apparatus and to perform measurements of parameters of the Standard Model Extension (SME). The current status of antihydrogen spectroscopy is reviewed and progress of ASACUSA is presented.

}, issn = {1572-9540}, doi = {10.1007/s10751-018-1536-9}, url = {https://doi.org/10.1007/s10751-018-1536-9}, author = {Widmann, E. and Amsler, C. and Arguedas Cuendis, S. and Breuker, H. and Diermaier, M. and Dupre, P. and Evans, C. and Fleck, M. and Gligorova, A. and Higaki, H. and Kanai, Y. and Kolbinger, B. and Kuroda, N. and Leali, M. and Leite, A. M. M. and M{\"a}ckel, V. and Malbrunot, C. and Mascagna, V. and Massiczek, O. and Matsuda, Y. and Murtagh, D. J. and Nagata, Y. and Nanda, A. and Phan, D. and Sauerzopf, C. and Simon, M. C. and Tajima, M. and Spitzer, H. and Strube, M. and Ulmer, S. and Venturelli, L. and Wiesinger, M. and Yamazaki, Y. and Zmeskal, J.} } @article {51, title = {From Synthesis To Physics of Anti-Hydrogen {\textendash} Cooling, Recombination, and Trapping of Antiprotons and Positrons}, journal = {J. Plasma Fusion Res.}, volume = {89}, year = {2013}, pages = {11}, author = {H. Higaki and F. Robicheaux and Torii, H.A. and N. Kuroda and K. Michishio and Y. Enomoto and Y. Nagata and M.C. Fujiwara and M. Hori} } @article {35, title = {Towards the production of anti-hydrogen beams}, journal = {AIP Conference Proceedings}, volume = {1521}, year = {2013}, pages = {134-143}, keywords = {antimatter, atomic beams, hydrogen neutral atoms, hyperfine structure, particle beam diagnostics}, doi = {10.1063/1.4796069}, url = {http://link.aip.org/link/?APC/1521/134/1}, author = {H. Higaki and Y. Enomoto and N. Kuroda and K. Michishio and D. J. Murtagh and S. Ulmer and S. Van Gorp and C. H. Kim and Y. Nagata and Y. Kanai and Torii, H.A. and M. Corradini and M. Leali and E. Lodi-Rizzini and V. Mascagna and L. Venturelli and N. Zurlo and K. Fujii and M. Otsuka and K. Tanaka and H. Imao and Y. Nagashima and Y. Matsuda and B. Juh{\'a}sz and A. Mohri and Y. Yamazaki}, editor = {Xabier Sarasola and Lutz Schweikhard and Thomas Sunn Pedersen} } @article {50, title = {Antihydrogen atom formation in a CUSP trap towards spin polarized beams}, journal = {Hyperfine Interactions}, volume = {212}, year = {2012}, pages = {31-40}, keywords = {Antihydrogen, Atomic beam, CPT invariance, Rydberg atom}, issn = {0304-3843}, doi = {10.1007/s10751-012-0646-z}, url = {http://dx.doi.org/10.1007/s10751-012-0646-z}, author = {Kuroda, N. and Enomoto, Y. and Michishio, K. and Kim, C.H. and Higaki, H. and Nagata, Y. and Kanai, Y. and Torii, H.A. and Corradini, M. and Leali, M. and Lodi-Rizzini, E. and Venturelli, L. and Zurlo, N. and Fujii, K. and Ohtsuka, M. and Tanaka, K. and Imao, H. and Nagashima, Y. and Matsuda, Y. and Juhasz, B. and Widmann, E. and Mohri, A. and Yamazaki, Y.} } @article {23, title = {Development of a monoenergetic ultraslow antiproton beam source for high-precision investigation}, journal = {Physical Review Special Topics - Accelerators and BeamsPhys. Rev. ST Accel. Beams}, volume = {15}, year = {2012}, month = {2012/02/17/}, pages = {024702 -}, url = {http://link.aps.org/doi/10.1103/PhysRevSTAB.15.024702}, author = {Kuroda, N. and Torii, H. A. and Nagata, Y. and Shibata, M. and Enomoto, Y. and Imao, H. and Kanai, Y. and Hori, M. and Saitoh, H. and Higaki, H. and Mohri, A. and Fujii, K. and Kim, C. H. and Matsuda, Y. and Michishio, K. and Nagashima, Y. and Ohtsuka, M. and Tanaka, K. and Yamazaki, Y.} } @article {49, title = {Synthesis of antihydrogen atoms in a CUSP trap}, journal = {Hyperfine Interactions}, volume = {209}, year = {2012}, pages = {35-41}, abstract = {

ASACUSA collaboration has been making a path to realize high precision microwave spectroscopy of ground-state hyperfine transitions of antihydrogen atom in flight for stringent test of the CPT symmetry. Recently, we have succeeded in synthesizing our first cold antihydrogen atoms employing a CUSP trap. It is expected that synthesized antihydrogen atoms in the low-field-seeking states are preferentially focused along the cusp magnetic field axis whereas those in the high-field-seeking states are not focused, resulting in the formation of a spin-polarized antihydrogen beam. We report the recent results of antihydrogen atom synthesis and beam production developed with the CUSP trap.

}, issn = {0304-3843}, url = {http://dx.doi.org/10.1007/s10751-012-0560-4}, author = {Kuroda, Naofumi and Enomoto, Yoshinori and Michishio, Koji and Kim, Chanhyoun and Higaki, Hiroyuki and Nagata, Yugo and Kanai, Yasuyuki and Torii, Hiroyuki and Corradini, Maurizzio and Leali, Marco and Lodi-Rizzini, Evandro and Mascagna, Valerio and Venturelli, Luca and Zurlo, Nicola and Fujii, Koki and Ohtsuka, Miki and Tanaka, Kazuo and Imao, Hiroshi and Nagashima, Yasuyuki and Matsuda, Yasuyuki and Juh{\'a}sz, Bertalan and Widmann, Eberhard and Mohri, Akihiro and Yamazaki, Yasunori} } @article {28, title = {Positron accumulation and manipulation for antihydrogen synthesis}, journal = {Journal of Physics: Conference Series}, volume = {225}, year = {2010}, pages = {012018}, abstract = {

Our group ASACUSA-MUSASHI has established an efficient way for accumulating antiprotons in the cusp trap, a combination of an anti-Helmholz superconducting coil and a multi-ring electrode trap. The last piece for synthesizing antihydrogens in the cusp trap is positron. We have developed a compact system to effectively accumulate positrons based on N 2 gas-buffer scheme with a specially designed high precision cylindrical multi-ring electrode trap. Millions of positrons were accumulated in the pre-accumulator just using polycrystalline tungsten moderators. The accumulated positrons were transported as a pulsed beam via three guiding coils and caught in the cusp trap under cryogenic and ultra high vacuum conditions without serious loss. Confinement of two kinds of numerous antiparticles, e.g., 10 8 positrons and 10 7 antiprotons, in the cusp trap becomes feasible.

}, url = {http://stacks.iop.org/1742-6596/225/i=1/a=012018}, author = {H Imao and K Michishio and Y Kanai and N Kuroda and Y Enomoto and H Higaki and K Kira and A Mohri and H A Torii and Y Nagata and C Kim and Y Matsuda and Y Nagashima and Y Yamazaki} } @article {22, title = {Synthesis of Cold Antihydrogen in a Cusp Trap}, journal = {Physical Review LettersPhys. Rev. Lett.}, volume = {105}, year = {2010}, month = {2010/12/07/}, pages = {243401 -}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.105.243401}, author = {Enomoto, Y. and Kuroda, N. and Michishio, K. and Kim, C. H. and Higaki, H. and Nagata, Y. and Kanai, Y. and Torii, H. A. and Corradini, M. and Leali, M. and Lodi-Rizzini, E. and Mascagna, V. and Venturelli, L. and Zurlo, N. and Fujii, K. and Ohtsuka, M. and Tanaka, K. and Imao, H. and Nagashima, Y. and Matsuda, Y. and Juhasz, B. and Mohri, A. and Yamazaki, Y.} } @article {21, title = {Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions}, journal = {Physical Review LettersPhys. Rev. Lett.}, volume = {105}, year = {2010}, month = {2010/11/17/}, pages = {213201 -}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.105.213201}, author = {Knudsen, H. and Torii, H. A. and Charlton, M. and Enomoto, Y. and Georgescu, I. and Hunniford, C. A. and Kim, C. H. and Kanai, Y. and Kristiansen, H.-P. E. and Kuroda, N. and Lund, M. D. and McCullough, R. W. and T{\"o}kesi, K. and Uggerh{\o}j, U. I. and Yamazaki, Y.} } @article {29, title = {ASACUSA MUSASHI: New progress with intense ultra slow antiproton beam}, journal = {Hyperfine Interactions}, volume = {194}, year = {2009}, pages = {71-76}, keywords = {Antihydrogen, Antiproton, Positron}, issn = {0304-3843}, doi = {10.1007/s10751-009-0032-7}, url = {http://dx.doi.org/10.1007/s10751-009-0032-7}, author = {Imao, H. and Tarek, M. and Michishio, K. and Enomoto, Y. and Shimoyama, T. and Kanai, Y. and Kuroda, N. and Mohri, A. and Higaki, H. and Saitoh, H. and Torii, H.A. and Nagata, Y. and Toyoda, H. and Matsuda, Y. and Nagashima, Y. and Yamazaki, Y.} } @article {24, title = {Radial compression of antiproton cloud for production of ultraslow antiproton beams}, journal = {AIP Conference Proceedings}, volume = {1114}, year = {2009}, pages = {157-162}, keywords = {particle traps, plasma, plasma simulation}, doi = {10.1063/1.3122278}, url = {http://link.aip.org/link/?APC/1114/157/1}, author = {N. Kuroda and Y. Nagata and H. A. Torii and D. Barna and J. Eades and D. Horv{\'a}th and M. Hori and H. Imao and K. Komaki and A. Mohri and M. Shibata and Y. Yamazaki}, editor = {James R. Danielson and Thomas Sunn Pedersen} } @article {16, title = {Compact cryogenic system with mechanical cryocoolers for antihydrogen synthesis}, journal = {Review of Scientific InstrumentsRev. Sci. Instrum.}, volume = {79}, year = {2008}, month = {2008/01/00/}, pages = {015112 - 4}, keywords = {cryogenics, exotic atoms, hydrogen, vacuum techniques}, url = {http://dx.doi.org/10.1063/1.2834876}, author = {Shibata, M. and Mohri, A. and Kanai, Y. and Enomoto, Y. and Yamazaki, Y.} } @article {34, title = {Observation of Ultra-Slow Antiprotons using Micro-channel Plate}, journal = {AIP Conference Proceedings}, volume = {1037}, year = {2008}, pages = {311-317}, keywords = {elementary particles, nuclear fragmentation, protons}, doi = {10.1063/1.2977850}, url = {http://link.aip.org/link/?APC/1037/311/1}, author = {H. Imao and H. A. Torii and Y. Nagata and H. Toyoda and T. Shimoyama and Y. Enomoto and H. Higaki and Y. Kanai and A. Mohri and Y. Yamazaki}, editor = {Yasuyuki Kanai and Yasunori Yamazaki} } @article {18, title = {Radial compression of a non-neutral plasma in a cusp trap for antihydrogen synthesis}, journal = {Physical Review APhys. Rev. A}, volume = {77}, year = {2008}, month = {2008/05/27/}, pages = {051403 -}, url = {http://link.aps.org/doi/10.1103/PhysRevA.77.051403}, author = {Saitoh, H. and Mohri, A. and Enomoto, Y. and Kanai, Y. and Yamazaki, Y.} } @article {17, title = {Radial Compression of an Antiproton Cloud for Production of Intense Antiproton Beams}, journal = {Physical Review LettersPhys. Rev. Lett.}, volume = {100}, year = {2008}, month = {2008/05/19/}, pages = {203402 -}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.100.203402}, author = {Kuroda, N. and Torii, H. A. and Shibata, M. and Nagata, Y. and Barna, D. and Hori, M. and Horvath, D. and Mohri, A. and Eades, J. and Komaki, K. and Yamazaki, Y.} } @article {14, title = {Confinement of a Large Number of Antiprotons and Production of an Ultraslow Antiproton Beam}, journal = {Physical Review Letters}, volume = {94}, year = {2005}, month = {2005/01/18/}, pages = {023401 -}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.94.023401}, author = {Kuroda, N. and Torii, H. A. and Franzen, K. Yoshiki and Wang, Z. and Yoneda, S. and Inoue, M. and Hori, M. and Juhasz, B. and Horvath, D. and Higaki, H. and Mohri, A. and Eades, J. and Komaki, K. and Yamazaki, Y.} } @article {26, title = {Control of plasmas for production of ultraslow antiproton beams}, journal = {AIP Conference Proceedings}, volume = {793}, year = {2005}, pages = {307-317}, keywords = {atomic beams, hadronic atoms, particle traps, plasma}, doi = {10.1063/1.2121992}, url = {http://link.aip.org/link/?APC/793/307/1}, author = {N. Kuroda and H. A. Torii and M. Shibata and Y. Nagata and D. Barna and D. Horv{\'a}th and M. Hori and J. Eades and A. Mohri and K. Komaki and Y. Yamazaki}, editor = {Yasunori Yamazaki and Michiharu Wada} } @article {25, title = {Production of ultra-slow antiproton beams}, journal = {AIP Conference Proceedings}, volume = {793}, year = {2005}, pages = {293-306}, keywords = {atomic beams, hadronic atoms, plasma}, doi = {10.1063/1.2121991}, url = {http://link.aip.org/link/?APC/793/293/1}, author = {Torii, Hiroyuki A. and N. Kuroda and M. Shibata and Y. Nagata and D. Barna and M. Hori and J. Eades and A. Mohri and K. Komaki and Y. Yamazaki}, editor = {Yasunori Yamazaki and Michiharu Wada} }