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Publication
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Measurements and 3D reconstruction of antimatter annihilations with the ASACUSA Micromegas Tracker
/ Radics, B (RIKEN (main) ; Zurich, ETH) ; Breuker, H (CERN) ; Dupre, P (RIKEN (main)) ; Higashi, Y (U. Tokyo (main)) ; Kaga, C (ADSM, Hiroshima) ; Leali, M (INFN, Brescia ; Brescia U.) ; Lodi Rizzini, E (INFN, Brescia ; Brescia U.) ; Mascagna, V (INFN, Brescia ; Brescia U.) ; Matsudate, T (U. Tokyo (main)) ; Murtagh, D J (RIKEN (main)) et al.
The aim of the ASACUSA-CUSP experiment is to form a beam of antihydrogen atoms for in-flight precision spectroscopic measurements. This is performed by trapping and mixing antiprotons and positrons in a common nested-well potential, which is sitting in a double-cusp magnetic field with minimum-B field configuration. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011010
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011010
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3.
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Antihydrogen synthesis in a double-CUSP trap towards test of the CPT-symmetry
/ Radics, B (Nishina Ctr., RIKEN ; Zurich, ETH) ; Ishikawa, S (Tokyo U., Komaba) ; Kuroda, N (Tokyo U., Komaba) ; Murtagh, D J (Nishina Ctr., RIKEN) ; Nagata, Y (Nishina Ctr., RIKEN) ; Tajima, M (Tokyo U., Komaba) ; Gorp, S (Nishina Ctr., RIKEN) ; Abo, Y (ADSM, Hiroshima) ; Dupre, P (Nishina Ctr., RIKEN) ; Higashi, Y (Tokyo U., Komaba) et al.
The aim of the ASACUSA-CUSP experiment at CERN is to produce a cold, polarised antihydrogen beam and perform a high precision measurement of the ground-state hyperfine transition frequency of the antihydrogen atom and compare it with that of the hydrogen atom using the same spectroscopic beam line. Towards this goal a significant step was successfully accomplished: synthesised antihydrogen atoms have been produced in a CUSP magnetic configuration and detected at the end of our spectrometer beam line in 2012 [1]. [...]
2016
- Published in : Hyperfine Interact. 237 (2016) 156
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.156
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New Quantity Describing the Pulse Shape Dependence of the High Gradient Limit in Single Cell Standing-Wave Accelerating Structures
/ Shi, Jiaru (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Dolgashev, Valery (SLAC) ; Grudiev, Alexej (CERN) ; Higashi, Yasuo (KEK, Tsukuba) ; Spataro, Bruno (Frascati) ; Wu, Xiaowei (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Wuensch, Walter (CERN)
A new quantity has been developed to study the relationship among the breakdown rate, the pulse width and the gradient. Difference pulse shapes can be treated by introducing a Green's function. [...]
CERN-ACC-2016-130.-
2016 - 3 p.
- Published in : 10.18429/JACoW-IPAC2016-THPOR042
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR042
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The development of the antihydrogen beam detector and the detection of the antihydrogen atoms for in-flight hyperfine spectroscopy
/ Nagata, Y (Wako, RIKEN) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A (Stefan Meyer Inst. Subatomare Phys.) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Abo, Y ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Dupre, P (Wako, RIKEN) ; Higashi, Y (Tokyo, U. Earth Sci. Astron.) ; Ishikawa, S (Tokyo, U. Earth Sci. Astron.) ; Kaga, C (ADSM, Hiroshima) et al.
We have been developing ground-state antihydrogen atomic beams to test CPT symmetry via in-flight hyperfine spectroscopy. A new antihydrogen beam detector has been developed. [...]
2015 - 1 p.
- Published in : J. Phys.: Conf. Ser. 635 (2015) 022061
IOP Open Access article: PDF;
In : 29th International Conference on Photonic, Electronic, and Atomic Collisions, Toledo, Spain, 22 - 28 July 2015, pp.022061
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Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report
/ Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A.A. (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M. (Stefan Meyer Inst. Subatomare Phys.) ; Dupré, P. (Wako, RIKEN) ; Higashi, Y. (Tokyo U., Komaba) ; Kaga, C. (ADSM, Hiroshima) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M. (Brescia U. ; INFN, Pavia) ; Lehner, S. (Stefan Meyer Inst. Subatomare Phys.) ; Lodi Rizzini, E. (Brescia U. ; INFN, Pavia) et al.
We report the successful commissioning and testing of a dedicated field-ioniser chamber for measuring principal quantum number distributions in antihydrogen as part of the ASACUSA hyperfine spectroscopy apparatus. The new chamber is combined with a beam normalisation detector that consists of plastic scintillators and a retractable passivated implanted planar silicon (PIPS) detector..
arXiv:1606.01791.-
2016-06-20 - 5 p.
- Published in : Hyperfine Interact. 237 (2016) 103
Fulltext: PDF; External link: Preprint
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.103
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Comparison of High Gradient Performance in Varying Cavity Geometries
/ Higo, Toshiyasu (KEK, Tsukuba) ; Abe, Tetsuo (KEK, Tsukuba) ; Arakida, Yoshio (KEK, Tsukuba) ; Higashi, Yasuo (Okinawa Inst. Sci. Tech.) ; Matsumoto, Shuji (KEK, Tsukuba) ; Shidara, Tetsuo (KEK, Tsukuba) ; Takatomi, Toshikazu (KEK, Tsukuba) ; Yamanaka, Masashi (KEK, Tsukuba) ; Grudiev, Alexej (CERN) ; Riddone, Germana (CERN) et al.
Four types of CLIC prototype TW accelerator structures were high-gradient tested at Nextef, KEK, up to 100 MV/m level and the fifth is under test now. The ramping speed of each processing and the resultant breakdown rate were compared among them. [...]
2013 - 3 p.
- Published in : (2013) , pp. WEPFI018
Fulltext: PDF; External link: JACoW server
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.WEPFI018
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Results from the CLIC X-BAND structure test program at the NLCTA
/ Adolphsen, Chris (SLAC) ; Bowden, Gordon (SLAC) ; Dolgashev, Valery (SLAC) ; Laurent, Lisa (SLAC) ; Tantawi, Sami (SLAC) ; Wang, Faya (SLAC) ; Wang, W Juwen (SLAC) ; Doebert, Steffen (CERN) ; Grudiev, Alexej (CERN) ; Riddone, Germana (CERN) et al.
As part of a SLAC-CERN-KEK collaboration on high gradient X-band structure research, several prototype structures for the CLIC linear collider study have been tested using two of the high power (300 MW) X-band rf stations in the NLCTA facility at SLAC. These structures differ in terms of their manufacturing (brazed disks and clamped quadrants), gradient profile (amount by which the gradient increases along the structure which optimizes efficiency and maximizes sustainable gradient) and HOM damping (use of slots or waveguides to rapidly dissipate dipole mode energy). [...]
CERN-OPEN-2013-033; SLAC-PUB-13697; CLIC-Note-799.-
Geneva : CERN, 2010 - 4 p.
Preprint: PDF; External link: Published version from PAC09
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE5PFP018
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9.
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Experimental study of rf pulsed heating
/ Laurent, L (SLAC) ; Heikkinen, S (CERN) ; Nantista, C (SLAC) ; Dolgashev, V (SLAC) ; Higashi, Y (KEK, Tsukuba) ; Aicheler, M (CERN) ; Tantawi, S (SLAC) ; Wuensch, W (CERN)
Cyclic thermal stresses produced by rf pulsed heating can be the limiting factor on the attainable reliable gradients for room temperature linear accelerators. This is especially true for structures that have complicated features for wakefield damping. [...]
2011
- Published in : Phys. Rev. Spec. Top. Accel. Beams 14 (2011) 041001
APS Published version, local copy: PDF;
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10.
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An Experimental Investigation on Cavity Pulsed Heating
/ Laurent, L (SLAC) ; Dolgashev, V A (SLAC) ; Nantista, C D (SLAC) ; Tantawi, S G (SLAC) ; Aicheler, M (CERN) ; Heikkinen, S T (CERN) ; Wuensch, W (CERN) ; Higashi, Y (KEK, Tsukuba)
Cavity pulsed heating experiments have been conducted at SLAC National Accelerator Laboratory in collaboration with CERN and KEK. These experiments were designed to gain a better understanding on the impact of high power pulsed magnetic fields on copper and copper alloys. [...]
2010
Published version from LINAC10: PDF;
In : 25th Linear Accelerator Conference, Tsukuba, Japan, 12 - 17 Sep 2010, pp.MOP076
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