1.
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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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2.
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Development of the Directly-Sliced Niobium Material for High Performance SRF Cavities
/ Kumar, Ashish (KEK, Tsukuba) ; Araki, Hayato (KEK, Tsukuba) ; Dohmae, Takeshi (KEK, Tsukuba) ; Ito, Hayato (KEK, Tsukuba) ; Saeki, Takayuki (KEK, Tsukuba) ; Umemori, Kensei (KEK, Tsukuba) ; Yamamoto, Akira (KEK, Tsukuba ; CERN ; JAI, UK ; Oxford U.) ; Yamanaka, Masashi (KEK, Tsukuba)
For the purpose of cost reduction for the ILC, KEK has been conducting R&D; on direct sliced Nb materials such as large grain and medium grain Nb. Single-cell, 3-cell, and 9-cell cavities have been manufactured, and each has demonstrated a high-performance accelerating gradient exceeding 35 MV/m. [...]
2023 - 7 p.
- Published in : JACoW SRF 2023 (2023) 634-640
Fulltext: PDF;
In : 21st International Conference on Radio-Frequency Superconductivity (SRF 2023), Grand Rapids, MI, United States, 22 - 30 Jun 2023, pp.634-640
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3.
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High Power Test of X-band Single Cell HOM-free Choke-mode Damped Accelerating Structure made by Tsinghua University
/ Wu, Xiaowei (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Abe, Tetsuo (KEK, Tsukuba) ; Chen, Huaibi (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Higo, Toshiyasu (KEK, Tsukuba) ; Shi, Jiaru (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.) ; Wuensch, Walter (CERN) ; Zha, Hao (Tsinghua U., Beijing, KLPRI ; Tsinghua U., Beijing, Dept. Eng. Phys.)
As an alternative design for CLIC main accelerating structures, X-band choke-mode damped structures had been studied for several years. However, the performance of choke-mode cavity under high power is still in lack of research. [...]
CERN-ACC-2016-129; CLIC-Note-1105.-
2016 - 3 p.
- Published in : 10.18429/JACoW-IPAC2016-THPOR043
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR043
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4.
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High Gradient Properties of a CLIC Prototype Accelerating Structure made by Tsinghua University
/ Wu, Xiaowei (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Higo, Toshiyasu (KEK, Tsukuba) ; Matsumoto, Shuji (KEK, Tsukuba) ; Shi, Jiaru (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Wuensch, Walter (CERN)
A CLIC prototype structure, T24_THU_#1, was recently high-gradient tested at KEK X-band test stand, Nextef. The copper parts of this 24-cell TW structure were delivered from CERN, were bonded and brazed, bench-tested and tuned in Tsinghua University. [...]
CERN-ACC-2016-131; CLIC-Note-1104.-
2016 - 4 p.
- Published in : 10.18429/JACoW-IPAC2016-THPOR041
Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOR041
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5.
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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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6.
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The First Beam Recirculation and Beam Tuning in the Compact ERL at KEK
/ Sakanaka, Shogo ; Adachi, Masahiro ; Adachi, Shin-ichi ; Akemoto, Mitsuo ; Arakawa, Dai ; Asaoka, Seiji ; Enami, Kazuhiro ; Endo, Kuninori ; Fukuda, Shigeki ; Furuya, Takaaki et al.
Superconducting(SC)-linac-based light sources, which can produce ultra-brilliant photon beams in CW operation, are attracting worldwide attention. In KEK, we have been conducting R&D; efforts towards the energy-recovery-linac(ERL)-based light source* since 2006. [...]
CERN-ACC-2014-380.-
2014 - 4 p.
- Published in : (2014) , pp. TUPP075
Fulltext: tupp075 - PDF; tupp075_2 - PDF; External link: JACoW server
In : 27th Linear Accelerator Conference, Geneva, Switzerland, 31 Aug - 5 Sep 2014, pp.TUPP075
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7.
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The SuperKEKB Has Broken the World Record of the Luminosity
/ Funakoshi, Yoshihiro (KEK, Tsukuba) ; Abe, Tetsuo (KEK, Tsukuba) ; Akai, Kazunori (KEK, Tsukuba) ; Arimoto, Yasushi (KEK, Tsukuba) ; Egawa, Kazumi (KEK, Tsukuba) ; Enomoto, Shun (KEK, Tsukuba) ; Fukuma, Hitoshi (KEK, Tsukuba) ; Furukawa, Kazuro (KEK, Tsukuba) ; Iida, Naoko (KEK, Tsukuba) ; Ikeda, Hitomi (KEK, Tsukuba) et al.
The SuperKEKB broke the world record of the luminosity in June 2020 in the Phase 3 operation. The luminosity has been increasing since then and the present highest luminosity is 4.65 x 10³⁴ cm⁻²s⁻¹ with β_{y}^{*} of 1 mm. [...]
2022 - 5 p.
- Published in : JACoW IPAC 2022 (2022) 1-5
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1-5
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8.
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Design and Beam Dynamics Study of Disk-Loaded Structure for Muon Linac
/ Sumi, Kazumichi (Nagoya U.) ; Ego, Hiroyasu (KEK, Tsukuba) ; Iijima, Toru (Nagoya U.) ; Inami, Kenji (Nagoya U.) ; Kondo, Yasuhiro (J-PARC) ; Mibe, Tsutomu (KEK, Tsukuba) ; Moriya, Katsuhiro (JAEA, Ibaraki) ; Nakazawa, Yuga (Ibaraki U., Mito) ; Otani, Masashi (J-PARC) ; Saito, Naohito (KEK, Tsukuba) et al.
The disk-loaded structures (DLS) in the muon LINAC are under development for the J-PARC muon g-2/EDM experiment. Four DLSs with an accelerating gradient of 20 MV/m take charge of muon acceleration from 40 MeV to 212 MeV, which corresponds to 70% to 94% of the speed of light. [...]
2022 - 4 p.
- Published in : JACoW IPAC 2022 (2022) 94-97
Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.94-97
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9.
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High-gradient breakdown studies of an X -band Compact Linear Collider prototype structure
/ Wu, Xiaowei (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Shi, Jiaru (Tsinghua U., Beijing ; CERN ; Tsinghua U., Beijing, KLPRI) ; Chen, Huaibi (Tsinghua U., Beijing) ; Shao, Jiahang (Tsinghua U., Beijing ; Tsinghua U., Beijing, KLPRI) ; Abe, Tetsuo (KEK, Tsukuba) ; Higo, Toshiyasu (KEK, Tsukuba) ; Matsumoto, Shuji (KEK, Tsukuba) ; Wuensch, Walter (CERN)
A Compact Linear Collider prototype traveling-wave accelerator structure fabricated at Tsinghua University was recently high-gradient tested at the High Energy Accelerator Research Organization (KEK). This X-band structure showed good high-gradient performance of up to 100 MV/m and obtained a breakdown rate of $1.27×10^{−8}$ per pulse per meter at a pulse length of 250 ns. [...]
2017 - 11 p.
- Published in : Phys. Rev. Accel. Beams 20 (2017) 052001
Fulltext: PDF;
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10.
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First high power tests of clic prototype accelerating structures with hom waveguide damping
/ Döbert, S (CERN) ; Grudiev, A (CERN) ; Riddone, G (CERN) ; Wuensch, W (CERN) ; Zennaro, R (CERN) ; Higo, T (KEK, Tsukuba) ; Matsumoto, S (KEK, Tsukuba) ; Yokoyama, K (KEK, Tsukuba) ; Adolphsen, C (SLAC) ; Wang, F (SLAC) et al.
Prototype accelerating structures for the Compact Linear Collider (CLIC) are being developed and high-power tested in collaboration between SLAC, KEK and CERN. Several undamped, low group-velocity and strongly tapered prototypes (of the so-called T18 design) have been operated above 100 MV/m average gradients at a very low breakdown rates. [...]
CERN-ATS-2010-204.-
Geneva : CERN, 2010 - 3 p.
Fulltext: PDF; Published version from LINAC10: PDF;
In : 25th Linear Accelerator Conference, Tsukuba, Japan, 12 - 17 Sep 2010, pp.MOP067
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