171 results on '"Michizono, Shinichiro"'
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2. The International Linear Collider: Report to Snowmass 2021
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Aryshev, Alexander, Behnke, Ties, Berggren, Mikael, Brau, James, Craig, Nathaniel, Freitas, Ayres, Gaede, Frank, Gessner, Spencer, Gori, Stefania, Grojean, Christophe, Heinemeyer, Sven, Jeans, Daniel, Kruger, Katja, List, Benno, List, Jenny, Liu, Zhen, Michizono, Shinichiro, Miller, David W., Moult, Ian, Murayama, Hitoshi, Nakada, Tatsuya, Nanni, Emilio, Nojiri, Mihoko, Padamsee, Hasan, Perelstein, Maxim, Peskin, Michael E., Poeschl, Roman, Posen, Sam, Robson, Aidan, Strube, Jan, Suehara, Taikan, Tian, Junping, Titov, Maxim, Vos, Marcel, White, Andrew, Wilson, Graham, Yokoya, Kaoru, Zarnecki, Aleksander Filip, Adachi, Ichiro, Agashe, Kaustubh, Jovin, Tatjana Agatonovic, Aihara, Hiroaki, Altmannshofer, Wolfgang, Alves, Daniele, Anguiano, Justin, Aoki, Ken-Ichi, Aoki, Masato, Aoki, Toshihiro, Aoki, Yumi, Arai, Yasuo, Araki, Hayato, Asada, Haruka, Asai, Kento, Asai, Shoji, Attie, David, Baer, Howard, Bagger, Jonathan, Bai, Yang, Bailey, Ian, Barrue, Ricardo, Bartoldus, Rainer, Barzi, Emanuela, Basso, Matthew, Bauerdick, Lothar, Baum, Sebastian, Bellerive, Alain, Belomestnykh, Sergey, Antequera, Jorge Berenguer, Beyer, Jakob, Bhat, Pushpalatha, Bilki, Burak, Black, Kevin, Bloom, Kenneth, Bodwin, Geoffrey, Boisvert, Veronique, Boran, Fatma, Boudry, Vincent, Boughezal, Radja, Boveia, Antonio, Bozovic-Jelisavcic, Ivanka, Brient, Jean-Claude, Brodsky, Stanley, Brunetti, Laurent, Buesser, Karsten, Bulyak, Eugene, Burrows, Philip N., Burt, Graeme C., Cai, Yunhai, Cairo, Valentina, Canepa, Anadi, Celiberto, Francesco Giovanni, Cenni, Enrico, Chacko, Zackaria, Chaikovska, Iryna, Checchin, Mattia, Chen, Lisong, Chen, Thomas Y., Cheng, Hsin Chia, Cho, Gi-Chol, Choudhary, Brajesh, Clarke, Jim, Cline, James, Co, Raymond, Cohen, Timothy, Colas, Paul, Damerell, Chris, Das, Arindam, Dasu, Sridhara, Dawson, Sally, de Blas, Jorge, de Lima, Carlos Henrique, Deandrea, Aldo, Dehmelt, Klaus, Delayen, Jean, Demarteau, Marcel, Denisov, Dmitri, Dermisek, Radovan, Dieguez, Angel, Dohmae, Takeshi, Dopke, Jens, Dort, Katharina, Du, Yong, Dudar, Bohdan, Dutta, Bhaskar, Dutta, Juhi, Einhaus, Ulrich, Elsen, Eckhard, Endo, Motoi, Eremeev, Grigory, Eren, Engin, Erler, Jens, Esarey, Eric, Everett, Lisa, Golfe, Angeles Faus, Garcia, Marcos Fernandez, Foster, Brian, Fourches, Nicolas, Fouz, Mary-Cruz, Fujii, Keisuke, Fujimoto, Junpei, Torregrosa, Esteban Fullan, Furukawa, Kazuro, Fusayasu, Takahiro, Fuster, Juan, Ganjour, Serguei, Gao, Yuanning, Gaur, Naveen, Geng, Rongli, Georgi, Howard, Gherghetta, Tony, Goldstein, Joel, Goncalves, Dorival, Gonski, Julia, Gonzalo, Tomas, Goto, Takeyoshi, Goto, Toru, Graf, Norman, Grames, Joseph, Grannis, Paul, Gray, Lindsey, Grohsjean, Alexander, Gu, Jiayin, Guler, Yalcin, Gutierrez, Phillip, Haba, Junji, Haber, Howard, Hallford, John, Hamaguchi, Koichi, Han, Tao, Hara, Kazuhiko, Harada, Daisuke, Hashimoto, Koji, Hashino, Katsuya, Hayashi, Masahito, Heinrich, Gudrun, Hidaka, Keisho, Higuchi, Takeo, Hinode, Fujio, Hioki, Zenro, Hirose, Minoru, Hiroshima, Nagisa, Hisano, Junji, Hollik, Wolfgang, Homiller, Samuel, Hong, Sungwoo, Hook, Anson, Horii, Yasuyuki, Hoshina, Hiroki, Hristova, Ivana, Huitu, Katri, Hyakutake, Yoshifumi, Iijima, Toru, Ikematsu, Katsumasa, Ilderton, Anton, Inami, Kenji, Irles, Adrian, Ishikawa, Akimasa, Ishiwata, Koji, Ito, Hayato, Ivanov, Igor, Iwamoto, Sho, Iwamoto, Toshiyuki, Iwasaki, Masako, Iwashita, Yoshihisa, Jia, Haoyi, Morales, Fabricio Jimenez, Joshi, Prakash, Jung, Sunghoon, Kacarevic, Goran, Kagan, Michael, Kakizaki, Mitsuru, Kalinowski, Jan, Kaminski, Jochen, Kanaya, Kazuyuki, Kanemura, Shinya, Kanno, Hayato, Kano, Yuya, Kashiwagi, Shigeru, Kato, Yukihiro, Kawada, Nanami, Kawada, Shin-ichi, Kawagoe, Kiyotomo, Khoze, Valery, Kichimi, Hiromichi, Kim, Doojin, Kitahara, Teppei, Kitano, Ryuichiro, Klamka, Jan, Komamiya, Sachio, Kong, K. C., Konomi, Taro, Kotera, Katsushige, Kou, Emi, Kravchenko, Ilya, Kubo, Kiyoshi, Kubo, Takayuki, Kumaoka, Takuya, Kumar, Ashish, Kumar, Nilanjana, Kunath, Jonas, Kundu, Saumyen, Kunitomo, Hiroshi, Kurata, Masakazu, Kuriki, Masao, Kusenko, Alexander, Lagouri, Theodota, Lankford, Andrew J., Lastovicka-Medin, Gordana, Diberder, Francois Le, Lee, Claire, Liepe, Matthias, Linacre, Jacob, Liptak, Zachary, Lomte, Shivani, Low, Ian, Ma, Yang, Maalouf, Hani, MacFarlane, David, Madison, Brendon, Madlener, Thomas, Maeda, Tomohito, Malek, Paul, Mandal, Sanjoy, Markiewicz, Thomas, Marshall, John, Martens, Aurelien, Martin, Victoria, Martinello, Martina, Rivero, Celso Martinez, Maru, Nobuhito, Matheson, John, Matsumoto, Shigeki, Matsunaga, Hiroyuki, Matsuo, Yutaka, Mawatari, Kentarou, Mbagwu, Johnpaul, McIntosh, Peter, McKeown, Peter, Meade, Patrick, Mekala, Krzysztof, Merkel, Petra, Mihara, Satoshi, Miralles, Víctor, Lopez, Marcos Miralles, Mishima, Go, Mishima, Satoshi, Mistlberger, Bernhard, Mitov, Alexander, Miyabayashi, Kenkichi, Miyamoto, Akiya, Mohanty, Gagan, Monaco, Laura, Mondragon, Myriam, Montgomery, Hugh E., Moortgat-Pick, Gudrid, Morange, Nicolas, Llacer, María Moreno, Moretti, Stefano, Mori, Toshinori, Morii, Toshiyuki, Moroi, Takeo, Morrissey, David, Nachman, Benjamin, Nagano, Kunihiro, Nakajima, Jurina, Nakamura, Eiji, Narita, Shinya, Nath, Pran, Nelson, Timothy, Newbold, David, Niki, Atsuya, Nishimura, Yasuhiro, Nishiyama, Eisaku, Nomura, Yasunori, Nowak, Kacper, Nozaki, Mitsuaki, de Vera, María Teresa Nunez Pardo, Ochoa, Ines, Ogata, Masahito, Ohashi, Satoru, Ohta, Hikaru, Ohta, Shigemi, Ohuchi, Norihito, Oide, Hideyuki, Okada, Nobuchika, Okada, Yasuhiro, Okawa, Shohei, Okayasu, Yuichi, Okugawa, Yuichi, Okugi, Toshiyuki, Okui, Takemichi, Okuyama, Yoshitaka, Omet, Mathieu, Omori, Tsunehiko, Ono, Hiroaki, Onoe, Tomoki, Ootani, Wataru, Otono, Hidetoshi, Ozawa, Shuhei, Griso, Simone Pagan, Papa, Alessandro, Paparella, Rocco, Park, Eun-Kyung, Perez, Gilad, Perez-Lorenzana, Abdel, Peters, Yvonne, Petriello, Frank, Piedra, Jonatan, Porod, Werner, Potter, Christopher, Price, Alan, Radkhorrami, Yasser, Reina, Laura, Reuter, Juergen, Richard, Francois, Riemann, Sabine, Rimmer, Robert, Rizzo, Thomas, Robens, Tania, Ruber, Roger, Jimeno, Alberto Ruiz, Saeki, Takayuki, Saha, Ipsita, Saito, Tomoyuki, Sakaguchi, Makoto, Sakai, Tadakatsu, Sakaki, Yasuhito, Sakurai, Kodai, Salvatico, Riccardo, Salvatore, Fabrizio, San, Yik Chuen, Sandick, Pearl, Sanuki, Tomoyuki, Sasikumar, Kollassery Swathi, Schaefer, Oliver, Schaefer, Ruth, Schneekloth, Uwe, Schoerner-Sadenius, Thomas, Schroeder, Carl, Schuster, Philip, Schwartzman, Ariel, Schwienhorst, Reinhard, Sefkow, Felix, Seiya, Yoshihiro, Sekiguchi, Motoo, Sekizawa, Kazuyuki, Senyo, Katsumi, Sert, Hale, Sertore, Danielev, Settles, Ronald, Shafi, Qaisar, Shahdara, Tetsuo, Haghi, Barmak Shams Es, Sharma, Ashish, Shelton, Jessie, Shepherd-Themistocleous, Claire, Shibuya, Hiroto, Shidara, Tetsuo, Shimomura, Takashi, Shindou, Tetsuo, Shoji, Yutaro, Shu, Jing, Sievers, Ian, Simon, Frank, Singh, Rajeev, Soreq, Yotam, Stanitzki, Marcel, Stapnes, Steinar, Steinhebel, Amanda, Stupak, John, Su, Shufang, Suekane, Fumihiko, Sugamoto, Akio, Sugawara, Yuji, Sugimoto, Satoru, Sugimoto, Yasuhiro, Sugiyama, Hiroaki, Sumino, Yukinari, Sundrum, Raman, Suzuki, Atsuto, Suzuki, Shin, Swiatlowski, Maximilian, Tait, Tim M. P., Takahashi, Shota, Takahashi, Tohru, Takeshita, Tohru, Takeuchi, Michihisa, Takubo, Yosuke, Tanabe, Tomohiko, Tanedo, Philip, Tanimoto, Morimitsu, Tao, Shuichiro, Tata, Xerxes, Tauchi, Toshiaki, Taylor, Geoffrey, Terada, Takahiro, Terunuma, Nobuhiro, Thaler, Jesse, Thea, Alessandro, Tillinger, Finn, Timmermans, Jan, Tobioka, Kohsaku, Toda, Kouichi, Tokiyasu, Atsushi, Toma, Takashi, Torndal, Julie, Tosun, Mehmet, Tsai, Yu-Dai, Tseng, Shih-Yen, Tsumura, Koji, Tuckler, Douglas, Uchida, Yoshiki, Uchiyama, Yusuke, Ueda, Daiki, Ukegawa, Fumihiko, Umemori, Kensei, Urakawa, Junji, Vallee, Claude, Vega, Roberto, Velasco, Liliana, Verdu-Andres, Silvia, Vernieri, Caterina, Vila, Anna, Alvarez, Ivan Vila, Vossebeld, Joost, Vsrms, Raghava, Vukasinovic, Natasa, Wackeroth, Doreen, Wakida, Moe, Wang, Liantao, Washio, Masakazu, Watanabe, Takashi, Watson, Nigel, Watts, Gordon, Weiglein, Georg, Wells, James D., Wenskat, Marc, Westhoff, Susanne, White, Glen, Williams, Ciaran, Willocq, Stephane, Wing, Matthew, Winter, Alasdair, Winter, Marc, Wu, Yongcheng, Xie, Keping, Xu, Tao, Yakovlev, Vyacheslav, Yamada, Shuei, Yamamoto, Akira, Yamamoto, Hitoshi, Yamamoto, Kei, Yamamoto, Yasuchika, Yamanaka, Masato, Yamashita, Satoru, Yamatani, Masahiro, Yamatsu, Naoki, Yasui, Shigehiro, Yoda, Takuya, Yonamine, Ryo, Yoshihara, Keisuke, Yoshioka, Masakazu, Yoshioka, Tamaki, Yuasa, Fukuko, Yumino, Keita, Zerwas, Dirk, Zheng, Ya-Juan, Zhou, Jia, Zhu, Hua Xing, Zobov, Mikhail, and Zomer, Fabian
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Physics - Accelerator Physics ,High Energy Physics - Experiment ,High Energy Physics - Phenomenology - Abstract
The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community., Comment: 356 pages, Large pdf file (40 MB) submitted to Snowmass 2021; v2 references to Snowmass contributions added, additional authors; v3 references added, some updates, additional authors
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- 2022
3. The International Linear Collider: A Global Project
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Bambade, Philip, Barklow, Tim, Behnke, Ties, Berggren, Mikael, Brau, James, Burrows, Philip, Denisov, Dmitri, Faus-Golfe, Angeles, Foster, Brian, Fujii, Keisuke, Fuster, Juan, Gaede, Frank, Grannis, Paul, Grojean, Christophe, Hutton, Andrew, List, Benno, List, Jenny, Michizono, Shinichiro, Miyamoto, Akiya, Napoly, Olivier, Peskin, Michael, Poeschl, Roman, Simon, Frank, Strube, Jan, Tian, Junping, Titov, Maksym, Vos, Marcel, White, Andrew, Wilson, Graham, Yamamoto, Akira, Yamamoto, Hitoshi, and Yokoya, Kaoru
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High Energy Physics - Experiment ,High Energy Physics - Phenomenology ,Physics - Accelerator Physics - Abstract
The International Linear Collider (ILC) is now under consideration as the next global project in particle physics. In this report, we review of all aspects of the ILC program: the physics motivation, the accelerator design, the run plan, the proposed detectors, the experimental measurements on the Higgs boson, the top quark, the couplings of the W and Z bosons, and searches for new particles. We review the important role that polarized beams play in the ILC program. The first stage of the ILC is planned to be a Higgs factory at 250 GeV in the centre of mass. Energy upgrades can naturally be implemented based on the concept of a linear collider. We discuss in detail the ILC program of Higgs boson measurements and the expected precision in the determination of Higgs couplings. We compare the ILC capabilities to those of the HL-LHC and to those of other proposed e+e- Higgs factories. We emphasize throughout that the readiness of the accelerator and the estimates of ILC performance are based on detailed simulations backed by extensive RandD and, for the accelerator technology, operational experience., Comment: 104 pages, 88 figures; v2: minor typo corrections; v3: many minor changes, including small corrections to the Tables and Figures in Section 11
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- 2019
4. The International Linear Collider. A Global Project
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Aihara, Hiroaki, Bagger, Jonathan, Bambade, Philip, Barish, Barry, Behnke, Ties, Bellerive, Alain, Berggren, Mikael, Brau, James, Breidenbach, Martin, Bozovic-Jelisavcic, Ivanka, Burrows, Philip, Caccia, Massimo, Colas, Paul, Denisov, Dmitri, Eigen, Gerald, Evans, Lyn, Faus-Golfe, Angeles, Foster, Brian, Fujii, Keisuke, Fuster, Juan, Gaede, Frank, Gao, Jie, Grannis, Paul, Grojean, Christophe, Hutton, Andrew, Idzik, Marek, Jeremie, Andrea, Kawagoe, Kiyotomo, Komamiya, Sachio, Lesiak, Tadeusz, Levy, Aharon, List, Benno, List, Jenny, Michizono, Shinichiro, Miyamoto, Akiya, Mnich, Joachim, Montgomery, Hugh, Murayama, Hitoshi, Napoly, Olivier, Okada, Yasuhiro, Pagani, Carlo, Peskin, Michael, Poeschl, Roman, Richard, Francois, Robson, Aidan, Schoerner-Sadenius, Thomas, Stanitzki, Marcel, Stapnes, Steinar, Strube, Jan, Suzuki, Atsuto, Tian, Junping, Titovx, Maksym, Vos, Marcel, Walkerx, Nicholas, Weise, Hans, White, Andrew, Wilson, Graham, Winter, Marc, Yamada, Sakue, Yamamoto, Akira, Yamamoto, Hitoshi, and Yamashita, Satoru
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High Energy Physics - Experiment ,Physics - Accelerator Physics ,Physics - Instrumentation and Detectors - Abstract
A large, world-wide community of physicists is working to realise an exceptional physics program of energy-frontier, electron-positron collisions with the International Linear Collider (ILC). This program will begin with a central focus on high-precision and model-independent measurements of the Higgs boson couplings. This method of searching for new physics beyond the Standard Model is orthogonal to and complements the LHC physics program. The ILC at 250 GeV will also search for direct new physics in exotic Higgs decays and in pair-production of weakly interacting particles. Polarised electron and positron beams add unique opportunities to the physics reach. The ILC can be upgraded to higher energy, enabling precision studies of the top quark and measurement of the top Yukawa coupling and the Higgs self-coupling. The key accelerator technology, superconducting radio-frequency cavities, has matured. Optimised collider and detector designs, and associated physics analyses, were presented in the ILC Technical Design Report, signed by 2400 scientists. There is a strong interest in Japan to host this international effort. A detailed review of the many aspects of the project is nearing a conclusion in Japan. Now the Japanese government is preparing for a decision on the next phase of international negotiations, that could lead to a project start within a few years. The potential timeline of the ILC project includes an initial phase of about 4 years to obtain international agreements, complete engineering design and prepare construction, and form the requisite international collaboration, followed by a construction phase of 9 years.
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- 2019
5. The potential of the ILC beam dump for high-intensity and large-area irradiation field with atmospheric-like neutrons and muons
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Sakaki, Yasuhito, Michizono, Shinichiro, Terunuma, Nobuhiro, and Sanami, Toshiya
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- 2023
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6. The International Linear Collider Machine Staging Report 2017
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Evans, Lyn and Michizono, Shinichiro
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Physics - Accelerator Physics ,High Energy Physics - Experiment ,Physics - Instrumentation and Detectors - Abstract
The Technical Design Report (TDR) of the ILC mainly concentrates on a baseline machine of 500 GeV centre-of-mass with detailed cost and manpower estimates consistent with this option. However, the discovery of a Higgs Boson with a mass of 125 GeV opens up the possibility of reducing cost by starting at a centre-of-mass energy of 250 GeV with the possibility of future upgrades to 500 GeV or even 1 TeV should the physics case for such an upgrade be compelling. The rest of this paper outlines the options for the design of a 250 GeV "Higgs factory".
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- 2017
7. An approach to characterize Lorentz force transfer function for superconducting cavities
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Qiu, Feng, Zhu, Zhenglong, Ma, Jinying, Jiang, Tiancai, Xue, Zongheng, Gao, Zheng, Chen, Qi, Xu, Chengye, Huang, Guirong, He, Yuan, Michizono, Shinichiro, Matsumoto, Toshihiro, and Miura, Takako
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- 2021
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8. RF commissioning of the compact energy recovery linac superconducting cavities in pulse mode
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Qiu, Feng, Miura, Takako, Arakawa, Dai, Higashi, Nao, Kako, Eiji, Matsumoto, Toshihiro, Michizono, Shinichiro, Miyajima, Tsukasa, Obina, Takashi, Sakai, Hiroshi, and Umemori, Kensei
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- 2021
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9. Development of a compact Local Power Distribution System for the ILC
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Du, Baiting, Matsumoto, Toshihiro, Michizono, Shinichiro, Miura, Takako, and Qiu, Feng
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- 2020
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10. Active cancellation of power supply ripple effects in continuous wave superconducting radio frequency cavities
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Qiu, Feng, Miura, Takako, Matsumoto, Toshihiro, Michizono, Shinichiro, Katagiri, Hiroaki, Arakawa, Dai, and Nakajima, Hiromitsu
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- 2020
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11. Accelerator development plan in KEK toward realization of High-power EUV-FEL for future lithography
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Kawata, Hiroshi, primary, Nakamura, Norio, additional, Kato, Ryukou, additional, Sakai, Hiroshi, additional, Tsuchiya, Kimichika, additional, Tanimoto, Yasunori, additional, Honda, Yosuke, additional, Shimada, Miho, additional, Tanikawa, Takanori, additional, Tanaka, Olga A., additional, Obina, Takashi, additional, and Michizono, Shinichiro, additional
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- 2024
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12. The International Linear Collider Technical Design Report - Volume 3.I: Accelerator R&D in the Technical Design Phase
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Adolphsen, Chris, Barone, Maura, Barish, Barry, Buesser, Karsten, Burrows, Philip, Carwardine, John, Clark, Jeffrey, Durand, Hélène Mainaud, Dugan, Gerry, Elsen, Eckhard, Enomoto, Atsushi, Foster, Brian, Fukuda, Shigeki, Gai, Wei, Gastal, Martin, Geng, Rongli, Ginsburg, Camille, Guiducci, Susanna, Harrison, Mike, Hayano, Hitoshi, Kershaw, Keith, Kubo, Kiyoshi, Kuchler, Victor, List, Benno, Liu, Wanming, Michizono, Shinichiro, Nantista, Christopher, Osborne, John, Palmer, Mark, Paterson, James McEwan, Peterson, Thomas, Phinney, Nan, Pierini, Paolo, Ross, Marc, Rubin, David, Seryi, Andrei, Sheppard, John, Solyak, Nikolay, Stapnes, Steinar, Tauchi, Toshiaki, Toge, Nobu, Walker, Nicholas, Yamamoto, Akira, and Yokoya, Kaoru
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Physics - Accelerator Physics - Abstract
The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the Z0 pole. A comprehensive value estimate of the accelerator is give, together with associated uncertainties. It is shown that no significant technical issues remain to be solved. Once a site is selected and the necessary site-dependent engineering is carried out, construction can begin immediately. The TDR also gives baseline documentation for two high-performance detectors that can share the ILC luminosity by being moved into and out of the beam line in a "push-pull" configuration. These detectors, ILD and SiD, are described in detail. They form the basis for a world-class experimental programme that promises to increase significantly our understanding of the fundamental processes that govern the evolution of the Universe., Comment: See also http://www.linearcollider.org/ILC/TDR . The full list of signatories is inside the Report
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- 2013
13. The International Linear Collider Technical Design Report - Volume 3.II: Accelerator Baseline Design
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Adolphsen, Chris, Barone, Maura, Barish, Barry, Buesser, Karsten, Burrows, Philip, Carwardine, John, Clark, Jeffrey, Durand, Hélène Mainaud, Dugan, Gerry, Elsen, Eckhard, Enomoto, Atsushi, Foster, Brian, Fukuda, Shigeki, Gai, Wei, Gastal, Martin, Geng, Rongli, Ginsburg, Camille, Guiducci, Susanna, Harrison, Mike, Hayano, Hitoshi, Kershaw, Keith, Kubo, Kiyoshi, Kuchler, Victor, List, Benno, Liu, Wanming, Michizono, Shinichiro, Nantista, Christopher, Osborne, John, Palmer, Mark, Paterson, James McEwan, Peterson, Thomas, Phinney, Nan, Pierini, Paolo, Ross, Marc, Rubin, David, Seryi, Andrei, Sheppard, John, Solyak, Nikolay, Stapnes, Steinar, Tauchi, Toshiaki, Toge, Nobu, Walker, Nicholas, Yamamoto, Akira, and Yokoya, Kaoru
- Subjects
Physics - Accelerator Physics - Abstract
The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the Z0 pole. A comprehensive value estimate of the accelerator is give, together with associated uncertainties. It is shown that no significant technical issues remain to be solved. Once a site is selected and the necessary site-dependent engineering is carried out, construction can begin immediately. The TDR also gives baseline documentation for two high-performance detectors that can share the ILC luminosity by being moved into and out of the beam line in a "push-pull" configuration. These detectors, ILD and SiD, are described in detail. They form the basis for a world-class experimental programme that promises to increase significantly our understanding of the fundamental processes that govern the evolution of the Universe., Comment: See also http://www.linearcollider.org/ILC/TDR . The full list of signatories is inside the Report
- Published
- 2013
14. Combined disturbance-observer-based control and iterative learning control design for pulsed superconducting radio frequency cavities
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Qiu, Feng, Michizono, Shinichiro, Matsumoto, Toshihiro, and Miura, Takako
- Published
- 2021
- Full Text
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15. Construction and commissioning of the compact energy-recovery linac at KEK
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Akemoto, Mitsuo, Arakawa, Dai, Asaoka, Seiji, Cenni, Enrico, Egi, Masato, Enami, Kazuhiro, Endo, Kuninori, Fukuda, Shigeki, Furuya, Takaaki, Haga, Kaiichi, Hajima, Ryoichi, Hara, Kazufumi, Harada, Kentaro, Honda, Tohru, Honda, Yosuke, Honma, Teruya, Hosoyama, Kenji, Kako, Eiji, Katagiri, Hiroaki, Kawata, Hiroshi, Kobayashi, Yukinori, Kojima, Yuuji, Kondou, Yoshinari, Tanaka, Olga, Kume, Tatsuya, Kuriki, Masao, Matsumura, Hiroshi, Matsushita, Hideki, Michizono, Shinichiro, Miura, Takako, Miyajima, Tsukasa, Nagahashi, Shinya, Nagai, Ryoji, Nakai, Hirotaka, Nakajima, Hiromitsu, Nakamura, Norio, Nakanishi, Kota, Nigorikawa, Kazuyuki, Nishimori, Nobuyuki, Nogami, Takashi, Noguchi, Shuichi, Obina, Takashi, Qiu, Feng, Sagehashi, Hidenori, Sakai, Hiroshi, Sakanaka, Shogo, Sasaki, Shinichi, Satoh, Kotaro, Sawamura, Masaru, Shimada, Miho, Shinoe, Kenji, Shishido, Toshio, Tadano, Mikito, Takahashi, Takeshi, Takai, Ryota, Takenaka, Tateru, Tanimoto, Yasunori, Uchiyama, Takashi, Ueda, Akira, Umemori, Kensei, Watanabe, Ken, and Yamamoto, Masahiro
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- 2018
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16. Development of low-loss cryo-accelerating structure with high-purity copper
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Iino, Akihiro, Yamaguchi, Seiya, Shintomi, Takakazu, Higo, Toshiyasu, Funahashi, Yoshisato, Matsumoto, Shuji, Michizono, Shinichiro, Ueno, Kenji, and Endo, Katsumi
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- 2017
- Full Text
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17. X-ray generation by inverse Compton scattering at the superconducting RF test facility
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Shimizu, Hirotaka, Akemoto, Mitsuo, Arai, Yasuo, Araki, Sakae, Aryshev, Alexander, Fukuda, Masafumi, Fukuda, Shigeki, Haba, Junji, Hara, Kazufumi, Hayano, Hitoshi, Higashi, Yasuo, Honda, Yosuke, Honma, Teruya, Kako, Eiji, Kojima, Yuji, Kondo, Yoshinari, Lekomtsev, Konstantin, Matsumoto, Toshihiro, Michizono, Shinichiro, Miyoshi, Toshinobu, Nakai, Hirotaka, Nakajima, Hiromitsu, Nakanishi, Kota, Noguchi, Shuichi, Okugi, Toshiyuki, Sato, Masato, Shevelev, Mikhail, Shishido, Toshio, Takenaka, Tateru, Tsuchiya, Kiyosumi, Urakawa, Junji, Watanabe, Ken, Yamaguchi, Seiya, Yamamoto, Akira, Yamamoto, Yasuchika, Sakaue, Kazuyuki, Hosoda, Seiichi, Iijima, Hokuto, Kuriki, Masao, Tanaka, Ryuta, Kuramoto, Ayaka, Omet, Mathieu, and Takeda, Ayaki
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- 2015
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18. The Future of Accelerators
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MICHIZONO, Shinichiro, primary
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- 2022
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19. Effects of Secondary Electron Emission Yield of Polyimide Films on Atomic Oxygen Irradiation
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Nitta, Kumi, Miyazaki, Eiji, Michizono, Shinichiro, Saito, Yoshio, Kleiman, Jacob, editor, Tagawa, Masahito, editor, and Kimoto, Yugo, editor
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- 2013
- Full Text
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20. Analysis on effects of transverse electric field in an injector cavity of compact-ERL at KEK
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Hwang, Ji-Gwang, Kim, Eun-San, Miyajima, Tsukasa, Honda, Yosuke, Harada, Kentaro, Shimada, Miho, Takai, Ryota, Kume, Tatsuya, Nagahashi, Shinya, Obina, Takashi, Nakamura, Norio, Sakanaka, Shogo, Hajima, Ryoichi, Nagai, Ryoji, Nishimori, Nobuyuki, Yamamoto, Masahiro, Uchiyama, Takashi, Kako, Eiji, Michizono, Shinichiro, and Miura, Takako
- Published
- 2014
- Full Text
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21. The International Linear Collider
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Michizono, Shinichiro
- Published
- 2019
- Full Text
- View/download PDF
22. Design study of compact medical accelerator using superconducting rf quadrupole for boron neutron capture therapy
- Author
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Katayama, Ryo, primary, Kako, Eiji, additional, Yamaguchi, Seiya, additional, Michizono, Shinichiro, additional, Umemori, Kensei, additional, and Kondo, Yasuhiro, additional
- Published
- 2022
- Full Text
- View/download PDF
23. High-Q/High-G R&D at KEK Using 9-Cell TESLA-Shaped Niobium Cavities
- Author
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Katayama, Ryo, Araki, Hayato, Ito, Hayato, Kako, Eiji, Konomi, Taro, Michizono, Shinichiro, Omet, Mathieu, and Umemori, Kensei
- Subjects
Cavities ,Accelerator Physics - Abstract
We will report on the current progress of High-Q/High-G R using three 1.3 GHz 9-cell TESLA shape niobium superconducting cavities at the High Energy Accelerator Research Organization (KEK). These cavities are made of bulk niobium of fine grain material with RRR >300 and have been annealed at 900 degrees for 3 hours. The cavity performances were evaluated at the Superconducting RF Test Facility at KEK (KEK-STF) after 2-step bake (70-75°C 4 h + 120°C 48 h), electropolishing at low temperature, and fast cooling procedure were applied to these cavities. In this study, obtained results will be compared with the baseline measurement for the standard recipe at KEK., Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA
- Published
- 2022
- Full Text
- View/download PDF
24. Research on Ceramic for RF Window
- Author
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Yamamoto, Yusuke, Michizono, Shinichiro, Nakamura, Katsumi, Yamamoto, Yasuchika, and Yoshizumi, Hiroyuki
- Subjects
Fundamental research and development ,Accelerator Physics - Abstract
Kyocera and KEK had started joint research on developing materials that satisfy the required characteristics as RF window materials. In previous studies, AO479B was developed, and it has been applied to some products. However, AO479B has size limitation in applying to products. Recently, large RF windows is demanded. Therefore, we have developed a new material AO479U which is designed to be applied to products regardless of the product size. In this report, the characteristics of AO479U was evaluated by comparing it with other materials, including the presence or absence of TiN coating. In order to clarify how the differences of materials or manufacturing processes contributes to heat generation and multipactor discharge occurring in RF windows, we measured important characteristics as RF window materials (relative permittivity, dielectric loss tangent, surface resistance, volume resistivity, secondary electron emission coefficient, and TiN thickness), and investigated the relationships of them and materials or manufacturing processes., Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA
- Published
- 2022
- Full Text
- View/download PDF
25. First Operation of a Klystron Fitted with a Superconducting MgB₂ Solenoid
- Author
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Catalán Lasheras, Nuria, Baig, Anisullah, Boronat, Marça, Castilla, Alejandro, Kimura, Takuji, Kolda, Peter, McMonagle, Gerard, Michizono, Shinichiro, Syratchev, Igor, and Yamamoto, Akira
- Subjects
MC7: Accelerator Technology ,Physics::Instrumentation and Detectors ,Physics::Accelerator Physics ,Accelerators and Storage Rings ,Accelerator Physics - Abstract
As part of the effort to reduce the energy consumption of large research facilities using accelerators, high efficiency klystrons are being developed by CERN. However, a large fraction of the wall-plug power required to operate these klystrons is used in the focusing magnetic elements around the klystron in the form of normal conducting solenoids. In 2019, a prototype solenoid made of MgB₂ was manufactured as a joint venture from CERN, Hitachi and KEK with the aim of reducing the power consumption by a factor ten using higher temperature superconductors. The characteristics of the magnet were measured upon manufacture and checked after the transport across the world. In 2020, the MgB₂ magnet was integrated around one of the klystrons in the X-band facility at CERN and put into operation in the beginning of 2021. We present in this paper the final performance of the klystron when fitted with the new SC solenoid and compare it with the standard normal conducting solenoid system., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand
- Published
- 2022
26. Stable Beam Operation in Compact ERL for Medical and Industrial Application at KEK
- Author
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Sakai, Hiroshi, Adachi, Masahiro, Arakawa, Dai, Eguchi, Shu, Fukuda, Masafumi, Haga, Kaiichi, Hagiwara, Masayuki, Hajima, Ryoichi, Hara, Kazufumi, Harada, Kentaro, Higashi, Nao, Honda, Tohru, Honda, Yosuke, Honma, Teruya, Hosumi, Mitsugu, Kako, Eiji, Kamiya, Yukihide, Kato, Ryukou, Kawase, Keigo, Kawata, Hiroshi, Kobayashi, Yukinori, Kojima, Yuuji, Konomi, Taro, Matsumura, Hiroshi, Michizono, Shinichiro, Mitsuda, Chikaori, Miura, Taichi, Miura, Takako, Miyajima, Tsukasa, Morikawa, Yu, Nagahashi, Shinya, Nakai, Hirotaka, Nakamura, Norio, Nakanishi, Kota, Nigorikawa, Kazuyuki, Nogami, Takashi, Norvell, Nora, Obina, Takashi, Qiu, Feng, Sagehashi, Hidenori, Sakamoto, Fumito, Shimada, Miho, Shimizu, Hirotaka, Shioya, Tatsuro, Tadano, Mikito, Takahashi, Takeshi, Takai, Ryota, Takaki, Hiroyuki, Tanaka, Olga, Tanimoto, Yasunori, Toyoda, Akihiro, Tsuchiya, Kimichika, Uchiyama, Takashi, Ueda, Akira, Umemori, Kensei, and Yamamoto, Masahiro
- Subjects
SRF Technology ,Accelerator Physics - Abstract
A superconducting Compact Energy Recovery Linac (cERL) for electrons was constructed in 2013 at KEK to demonstrate energy recovery concept with low emittance, high-current CW beams of more than 10 mA for future multi-GeV ERL. Recently this cERL was operated not only to demonstrate energy recovery linac high current beam operation but also to promote and conduct a variety of industrial applications such as FEL, THz operation and Rare Isotope Production and irradiation for some materials. In this talk, I will present the status of the studies to realize the stable high-current low emittance CW beam and some applications with this beam., Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA
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- 2022
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27. Fabrication of 1.3 GHz SRF Cavities Using Medium Grain Niobium Discs Directly Sliced from Forged Ingot
- Author
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Dohmae, Takeshi, Abe, Keiko, Fajardo, Arnel, Inoue, Hitoshi, Kumar, Ashish, Lannoy, Nathan, Michizono, Shinichiro, Myneni, Ganapati Rao, Saeki, Takayuki, Umemori, Kensei, Watanabe, Yuichi, Yamamoto, Akira, Yamanaka, Masashi, and Yoshida, Koichi
- Subjects
Cavities ,Accelerator Physics - Abstract
Medium grain (MG) niobium disc which is directly sliced from forged ingot is newly investigated for the cavity material. An effective cost reduction can be achieved using MG niobium since rolling process which is necessary for typical niobium sheet can be skipped during MG niobium production. Grain size of MD niobium is 200-300 um which is much smaller than large grain (LG) niobium directly sliced from melted niobium ingot. Hence, the formability of MG niobium is expected to be much better than LG niobium. KEK has started fabrication of cavity using MG niobium. In this talk, characteristic of MG niobium during fabrication will be reported., Proceedings of the 20th International Conference on RF Superconductivity, SRF2021, East Lansing, MI, USA
- Published
- 2022
- Full Text
- View/download PDF
28. Proposal for the ILC Preparatory Laboratory (Pre-lab)
- Author
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Nakada, T., Michizono, S., Murayama, H., Lankford, A., Taylor, G., Stapnes, S., Okada, Y., Collier, Paul, Dunham, Bruce, Elsen, Eckhard, Foster, Brian, Fuster, Juan, Henderson, Stuart, Kruecken, Reiner, Lykken, Joseph D., Titov, Maksym, Yamashita, Satoru, Belomestnykh, Sergey, Buesser, Karsten, Burrows, Philip, Catalán-Lasheras, Nuria, Cenni, Enrico, Clarke, Jim, Delikaris, Dimitri, Doebert, Steffen, Faus-Golfe, Angeles, García-Tabarés, Luis, Geng, Rongli, Grames, Joseph, Hayano, Hitoshi, Kubo, Kiyoshi, Kuriki, Masao, Latina, Andrea, Laxdal, Robert, Liepe, Matthias, List, Benno, List, Jenny, Markiewicz, Thomas, McIntosh, Peter, Michizono, Shinichiro, Monaco, Laura, Moortgat-Pick, Gudrid, Napoly, Olivier, Okugi, Toshiyuki, Omori, Tsunehiko, Osborne, John Andrew, Parker, Brett, Podadera, Ivan, Posen, Sam, Riemann, Sabine, Rimmer, Robert, Ross, Marc C., Rubin, David L., Sanuki, Tomoyuki, Sievers, Peter, Solyak, Nikolay, Takahashi, Tohru, Terunuma, Nobuhiro, Umemori, Kensei, Weise, Hans, White, Glen, Yamamoto, Akira, Yamamoto, Yasuchika, Yokoya, Kaoru, Zobov, Mikhail, Murayama, Hitoshi, Vallée, Claude, Behnke, Ties, Brau, James, Denisov, Dmitri, Forti, Francesco, Fujii, Keisuke, Gao, Yuanning, Mazumdar, Kajari, McBride, Patricia, Nelson, Timothy, Nojiri, Mihoko, Simon, Frank, Urquijo, Phillip, White, Andrew, Żarnecki, Aleksander Filip, Bellerive, Alain, Božović-Jelisavčić, Ivanka, Kawagoe, Kiyotomo, Pöschl, Roman, Sugimoto, Yasuhiro, Krüger, Katja, Merkel, Petra, Miller, David, Vos, Marcel, Gaede, Frank, Jeans, Daniel, Strube, Jan, Peskin, Michael, Robson, Aidan, and Tian, Junping
- Subjects
Accelerator Physics (physics.acc-ph) ,hep-ex ,FOS: Physical sciences ,hep-ph ,nucl-ex ,Accelerators and Storage Rings ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Physics - Accelerator Physics ,Nuclear Physics - Experiment ,Nuclear Experiment (nucl-ex) ,Nuclear Experiment ,Particle Physics - Experiment ,Particle Physics - Phenomenology ,physics.acc-ph - Abstract
During the preparatory phase of the International Linear Collider (ILC) project, all technical development and engineering design needed for the start of ILC construction must be completed, in parallel with intergovernmental discussion of governance and sharing of responsibilities and cost. The ILC Preparatory Laboratory (Pre-lab) is conceived to execute the technical and engineering work and to assist the intergovernmental discussion by providing relevant information upon request. It will be based on a worldwide partnership among laboratories with a headquarters hosted in Japan. This proposal, prepared by the ILC International Development Team and endorsed by the International Committee for Future Accelerators, describes an organisational framework and work plan for the Pre-lab. Elaboration, modification and adjustment should be introduced for its implementation, in order to incorporate requirements arising from the physics community, laboratories, and governmental authorities interested in the ILC., 48 pages, 5 figures
- Published
- 2021
29. Estimation of surface charges on dielectric materials for high power rf windows
- Author
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Michizono, Shinichiro, Saito, Yoshio, Suharyanto, Yamano, Yasushi, and Kobayashi, Shinichi
- Published
- 2009
- Full Text
- View/download PDF
30. Study of Conduction-Cooled Superconducting Quadrupole Magnets Combined with Dipole Correctors for the ILC Main Linac
- Author
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Arimoto, Yasushi, Kashikhin, Vladimir, Michizono, Shinichiro, Morikawa, Yu, Ohuchi, Norihito, Oki, Toshiyuki, Shimizu, Hirotaka, Umemori, Kensei, Wang, Xudong, Yamamoto, Akira, Yamamoto, Yasuchika, and Zong, Zhanguo
- Subjects
MC1: Circular and Linear Colliders ,Physics::Accelerator Physics ,Accelerator Physics - Abstract
A superconducting rf (SRF) cryomodule for International Linear Collider(ILC) Main Linac equips focus/steering magnets. The magnets are "superferric" magnets with four superconducting (SC) race track coils conductively cooled from the cryomodule LHe supply pipe. The quadrupole field gradient and dipole field are 40 T/m and 0.1 T, respectively. The magnet length and iron-pole radius are 1 m and 0.045 m, respectively. It is known that dark current is generated at SRF cavities and accelerated through the following linac string. The dark current reaches and heats the SC magnets. It is estimated that the power deposition in the magnet may reach more than a few watts and temperature of the SC coils may locally reach to critical temperature of NbTi. It is important to make the magnet not reach quench with sufficient conduction cooling. We aim to realize the SC magnet which can stably operate under such condition. We plan to develop test coils made of three types of SC materials, NbTi, Nb₃Sn, and MgB₂ and study thermal characteristics and stability . We will develop a short model magnet, based on the test coil results. Here, we will present the magnet design study and the R plan., Proceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil
- Published
- 2021
- Full Text
- View/download PDF
31. Characterization of Microphonics in the cERL Main Linac Superconducting Cavities
- Author
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Qiu, Feng, Arakawa, Dai, Egi, Masato, Kako, Eiji, Katagiri, Hiroaki, Konomi, Taro, Matsumoto, Toshihiro, Michizono, Shinichiro, Miura, Takako, Sakai, Hiroshi, and Umemori, Kensei
- Subjects
Physics::Optics ,Physics::Accelerator Physics ,Accelerator Physics ,WG4: Superconducting RF - Abstract
In the main linac (ML) of the KEK-cERL, two superconducting cavities with high loaded Q (QL ¿ 1×107) are operated in continuous wave (CW) mode. It is important to control and suppress the microphonics detuning owing to the low bandwidth of the cavities. We evaluated the background microphonics detuning by the low level radio frequency system during the beam operation. Interestingly, a ¿field level dependence microphonics¿ phenomenon was observed on one of the cavities in the ML. Several frequency components were suddenly excited if the cavity field is above a threshold field (~3 MV/m). We found that this threshold field is probably related with the cavity quench limits despite the unclear inherent physical mechanism. Furthermore, in order to optimize the cavity resonance control system for better microphonics rejection, we have measured the mechanical transfer function between the fast piezo tuner and cavity detuning. Finally, we validated this model by comparing the model response with actual system response., Proceedings of the 63th ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs, ERL2019, Berlin, Germany
- Published
- 2020
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- View/download PDF
32. Secondary electron emission from alumina RF windows
- Author
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Michizono, Shinichiro
- Subjects
Aluminum oxide -- Electric properties ,Radio equipment -- Usage ,Electrons -- Emission ,Electrons -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
The development of alumina RF windows for use at the output section of high-power RF sources is an important issue for accelerators. The breakdown of RF windows is caused by 1. the multipactor effect (electron multiplication on the surface) and/or 2. the discharge of accumulated charges (due to the multipactor effect). Measurements of secondary electron emission (SEE) and surface charging were carried out to determine the durability of various alumina ceramics in this application. Since excessive surface heating takes place during surface discharge, SEE yields at high temperature were also measured. The results indicate that SEE yields become lower at high temperature, and that higher purity alumina ceramics show higher SEE yields. High-power tests using a resonant ring were conducted in order to observe surface charging and electron accumulation. Higher purity alumina ceramics showed superior performance in the high-power tests, probably due to lower surface charging. Index Terms--Accelerator RF systems, electron emission, surface discharges, surface charging.
- Published
- 2007
33. Effect of mechanical finishes on secondary electron emission of alumina ceramics
- Author
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Suharyanto, Yamano, Yasushi, Kobayashi, Shinichi, Michizono, Shinichiro, Saito, Yoshio, and Tumiran
- Subjects
Aluminum oxide -- Electric properties ,Aluminum oxide -- Research ,Ceramic materials -- Electric properties ,Ceramic materials -- Research ,Ceramics -- Electric properties ,Ceramics -- Research ,Electrons -- Emission ,Electrons -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
The effect of surface roughness of insulator on the secondary electron emission (SEE) coefficients was investigated with changing the incident angle of primary electrons. The SEE coefficients were measured using a scanning electron microscope with a single-pulse electron beam (100 pA, 1 ms). As a result, the SEE coefficients increased with the incident angle for smooth surface, while those of rough surface almost did not change with the incident angle. The SEE coefficients of commercial alumina ceramics with three different surface finishes, i.e. as-sintered, as-ground and mirror-finished samples, were also measured before and after annealing treatments. This treatment was carried out in air at 1400 [degrees]C for 1 h. After annealing, the SEE coefficients were higher than those of unannealed samples. This increase is proposed to be due to the defect recoveries as well as neutralizations of charging, which significantly influence the SEE. For relative low purity (95% or less), the SEE coefficients of annealed alumina became lower after mechanical grinding operations and lower again after mirror-finished operations. The SEE coefficients of 99.7% purity alumina were almost unaffected by the mechanical finishes. Index Terms--Alumina ceramic, secondary electron emission, mechanical finish, grinding, polishing, surface roughness, annealing treatment, rf window material.
- Published
- 2007
34. Surface characteristics and electrical breakdown of alumina materials
- Author
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Michizono, Shinichiro, Saito, Yoshio, Suharyanto, Yamano, Yasushi, and Kobayashi, Shinichi
- Published
- 2007
- Full Text
- View/download PDF
35. Secondary electron emission of TiN-coated alumina ceramics
- Author
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Suharyanto, Michizono, Shinichiro, Saito, Yoshio, Yamano, Yasushi, and Kobayashi, Shinichi
- Published
- 2007
- Full Text
- View/download PDF
36. Secondary electron emission and surface charging evaluation of alumina ceramics and sapphire
- Author
-
Suharyanto, Yamano, Yasushi, Kobayashi, Shinichi, Michizono, Shinichiro, and Saito, Yoshio
- Subjects
Ceramic materials -- Thermal properties ,Ceramic materials -- Electric properties ,Ceramics -- Thermal properties ,Ceramics -- Electric properties ,Sapphires -- Thermal properties ,Sapphires -- Electric properties ,Electrons -- Emission ,Electrons -- Research ,Business ,Electronics ,Electronics and electrical industries - Abstract
The breakdown of alumina rf windows is mostly caused by multipactor, as well as by material defects and contamination. Since multipator induces localized surface heating, leading to surface melting, it is necessary to observe secondary electron emission (SEE) coefficients of alumina ceramics under high temperature conditions. The SEE coefficients of commercial alumina ceramics and sapphire were measured by a scanning electron microscopy (SEM) with a single short-pulsed electron beam (100 pA, 1 ms) at room temperature and at 650[degrees]C. Additive materials used for sintering alumina, such as Si[O.sub.2] and MgO, were also investigated. Surface charging evaluations have also become important because the accumulated charges are discharged at the threshold field, resulting in surface discharge. The surface charging evaluations were carried out by multi-pulse measurements with the injection of successive pulses on the sample. As a result, reductions in the SEE coefficients with temperature were confirmed, except for sapphire. The multi-pulse measurement results indicated that surface charging of the sapphire was higher than that of other samples. This may be one of the factors that causes sapphire not to be durable for rf window applications, compared with alumina ceramics. Although there are few exceptions, it was found that the SEE coefficients of alumina ceramics increased with the purity and the average grain size. Index Terms--Electron emission, surface charging, high-temperature measurement, multipactor, rf window, alumina ceramic, sapphire.
- Published
- 2006
37. Application of disturbance observer-based control on pulsed superconducting radio frequency cavities
- Author
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Qiu, Feng, primary, Miura, Takako, additional, Arakawa, Dai, additional, Higashi, Nao, additional, Honda, Yosuke, additional, Kako, Eiji, additional, Matsumoto, Toshihiro, additional, Michizono, Shinichiro, additional, Miyajima, Tsukasa, additional, Obina, Takashi, additional, Sakai, Hiroshi, additional, Umemori, Kensei, additional, and Yamamoto, Masahiro, additional
- Published
- 2021
- Full Text
- View/download PDF
38. Effects of Secondary Electron Emission Yield of Polyimide Films on Atomic Oxygen Irradiation
- Author
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Nitta, Kumi, primary, Miyazaki, Eiji, additional, Michizono, Shinichiro, additional, and Saito, Yoshio, additional
- Published
- 2012
- Full Text
- View/download PDF
39. Development of Prototype MGB 2Superconducting Solenoid Magnet for High-Efficiency Klystron Applications
- Author
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Watanabe, Hiroyuki, primary, Calatroni, Sergio, additional, Koga, Tomoyuki, additional, Tanaka, Hideki, additional, Wakuda, Tsuyoshi, additional, Yamamoto, Akira, additional, Michizono, Shinichiro, additional, Syratchev, Igor, additional, Mcmonagle, Gerard, additional, and Lasheras, Nuria Catalan, additional
- Published
- 2020
- Full Text
- View/download PDF
40. Performance of MgB2 Superconductor Developed for High-Efficiency Klystron Applications
- Author
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Tanaka, Hideki, primary, Suzuki, Takaaki, additional, Kodama, Motomune, additional, Koga, Tomoyuki, additional, Watanabe, Hiroyuki, additional, Yamamoto, Akira, additional, and Michizono, Shinichiro, additional
- Published
- 2020
- Full Text
- View/download PDF
41. KEK Center for Applied Superconducting Accelerator (CASA) and Applied Superconducting Accelerator Consortium
- Author
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MICHIZONO, Shinichiro, primary
- Published
- 2020
- Full Text
- View/download PDF
42. Recommendations on ILC Project Implementation
- Author
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Desch, Klaus, Lankford, Andy, Mazumdar, Kajari, Mcbride, Patricia, Michizono, Shinichiro, Okada, Yasuhiro, Vallée, Claude, Fujii, Keisuke, Okugi, Toshiyuki, Suehara, Taikan, Tanabe, Tomohiko, Terunuma, Nobuhiro, Yamamoto, Yasuchika, Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), KEK International Working Group, and Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
KEK Lab ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,costs ,ILC Coll ,activity report ,accelerator: design - Abstract
International audience; The International Linear Collider (ILC) is a next-generation experimental facility to explore fundamental laws of the Universe. The importance of electron-positron linear colliders as a future experimental facility has been long recognized by the worldwide high energy physics community. A global design team, the Global Design Efforts (GDE), was set up under the International Committee for Future Accelerators (ICFA) for design and coordination of R&D activities of the ILC in 2005, and the ILC Technical Design Report (TDR) was completed in 2013. ICFA then established the Linear Collider Collaboration (LCC) and the Linear Collider Board (LCB) and has continued to support the worldwide efforts for realizing the ILC. Meanwhile, in 2012, KEK and the high energy physics community in Japan proposed that Japan should host the ILC, which was welcomed by the worldwide high energy physics community. Implementation of the ILC project will require strong involvements from international partners due to its scientific importance and large scale. Aspects of international cost sharing and governance of the organization carrying out the ILC project will need to be discussed and agreed at the governmental level. Therefore, KEK established an International Working Group (WG) on the ILC Project in May 2019, inviting scientific experts worldwide* , and asking them to study international aspects of the project implementation from viewpoints of researchers. They were requested to create a report on model of international cost sharing for construction and operation, organization and governance of the ILC Laboratory, and international sharing of the remaining technical preparation. The WG report was submitted to KEK on September 25, 2019. After reviewing the content of the report, KEK decided to make it available within this document entitled “Recommendations on ILC Project Implementation”. This document summarizes the deliberations from researchers’ viewpoints; it does not intend to pre-empt governments and funding agencies. It is hoped that it will be helpful for discussions among governments and funding agencies.
- Published
- 2019
43. Study on Nitrogen Infusion using KEK New Furnace
- Author
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Umemori, Kensei, Kako, Eiji, Konomi, Taro, Michizono, Shinichiro, Okada, Takafumi, Sakai, Hiroshi, and Tamura, Jun
- Subjects
Fundamental R&D - Nb ,Accelerator Physics - Abstract
KEK has been carried out high-Q/high-G R, to realize high performance of SRF cavities toward ILC. KEK constructed a new furnace, which is dedicated for N-infusion studies. We performed more than 10 times of N-infusion trials using 1.3 GHz single-cell cavities. Some results showed better Q-values up to high field, however, some results showed degraded Q-E slopes probably due to contamination. Improvement of accelerating gradient is not observed at moment. We have tried to clean the furnace and Nitrogen injection line to reduce the effect of contamination. Details of procedures of N-infusion, results of vertical tests, condition of the furnace including RGA spectrum and Nb sample analysis results are shown., Proceedings of the 19th International Conference on RF Superconductivity, SRF2019, Dresden, Germany
- Published
- 2019
- Full Text
- View/download PDF
44. Development Status of RF Reference Phase Stabilization System for SuperKEKB Injector LINAC
- Author
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Liu, Na, Arakawa, Dai, Du, Baiting, Katagiri, Hiroaki, Kobayashi, Tetsuya, Matsumoto, Toshihiro, Michizono, Shinichiro, Miura, Takako, Qiu, Feng, and Yano, Yoshiharu
- Subjects
MC7: Accelerator Technology ,Accelerator Physics - Abstract
SuperKEKB injector linear accelerator (LINAC) has 600 m beam lines which consist of 8 sectors. The 2856 MHz RF reference signals are distributed to each sector with long phase stabilized optical fiber (PSOF). The RF reference phase stability requirement is estimated to be 0.2°(RMS) corresponding to 200 fs. The prototype of RF reference phase stabilization system with single mode optical circulator was implemented and demonstrated in the laboratory. The returned phase drift is compensated by a piezo-driven fiber stretcher. The transmitted phase through 120 m PSOF is stabilized to 41 fs (pk-pk), which fulfilled the requirement. This paper introduces the RF reference phase stabilization system and reports the preliminary feedback result., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia
- Published
- 2019
- Full Text
- View/download PDF
45. Development of High Intensity, High Brightness, CW SRF Gun with Bi-Alkali Photocathode
- Author
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Konomi, Taro, Honda, Yosuke, Kako, Eiji, Kobayashi, Yukinori, Michizono, Shinichiro, Miyajima, Tsukasa, Sakai, Hiroshi, Umemori, Kensei, and Yamaguchi, Seiya
- Subjects
Cavities - Design ,Accelerator Physics - Abstract
Superconducting conduction electron guns can realize high acceleration voltage and high beam repetition. KEK has been developing the 1.3 GHz elliptical type 1.5 cell superconducting RF gun to investigate fundamental performance. The surface cleaning methods and tools were developed by using KEK SRF gun cavity #1 and surface peak electric field reached to 75 MV/m without field emission. We will apply this technique to the SRF gun cavity #2 for beam operation. The gun cavity #2 equips the helium jacket, frequency tuner cathode position adjuster to operate the electron beam. The RF structure was designed based on the gun cavity #1. The cathode rod is made of Nb. The photocathode deposited on the cathode rod will be cool down to 2K to minimize thermal emittance. The fabrication of the gun cavity #2 and helium jacket were completed. 4 times vertical tests were carried out. We will report the vertical test results and preparation of the horizontal test., Proceedings of the 19th International Conference on RF Superconductivity, SRF2019, Dresden, Germany
- Published
- 2019
- Full Text
- View/download PDF
46. Development of MicroTCA-based Low-level Radio Frequency Control Systems for cERL and STF
- Author
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Qiu, Feng, Matsumoto, Toshihiro, Michizono, Shinichiro, and Miura, Takako
- Subjects
Hardware Technologies and Custom Hardware, Feedback Control and Tuning, Timing and Synchronization ,Accelerator Physics - Abstract
Low-level radio frequency (LLRF) control systems based on µTCA standard have been developed for facilities such as compact energy recovery linac (cERL) and superconducting test facility (STF) at the High Energy Accelerator Research Organization (KEK), Japan. Three different types of boards were developed according to their different applications. Experimental physics and industrial control system (EPICS) was selected as the data communication system for all of these µTCA boards. The LLRF systems showed good performance during the beam commissioning. This paper presents the current status of the µTCA-based LLRF systems in the cERL and STF., Proceedings of the 12th Int. Workshop on Emerging Technologies and Scientific Facilities Controls, PCaPAC2018, Hsinchu, Taiwan
- Published
- 2019
- Full Text
- View/download PDF
47. Design of a Compact Power Distribution System for the ILC
- Author
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Du, Baiting, Liu, Na, Matsumoto, Toshihiro, Michizono, Shinichiro, Miura, Takako, and Qiu, Feng
- Subjects
MC1: Circular and Linear Colliders ,Accelerator Physics - Abstract
The Local power distribution system (LPDS) of the In-ternational Linear Collider (ILC) is constructed to transmit RF power from the 10 MW klystron to 39 cavi-ties. Each eight or nine 9-cell cavities is assembled in one cryomodule. The variable hybrid is used to adjust the power dividing ratio due to the different required power of each cavity and the variable phase shifter is used to compensate the phase drift caused by the variable hybrid. More compact LPDS is expected to be integrated on the cryomodule decreasing financial cost. We re-design the shorter variable hybrid with a margin of power ratio of ±25% and phase shifter of total phase range being 35° for compensating hybrid and on-crest searching. Fixed phase shifters are designed to adjust the phase difference between adjacent cavities for beam acceleration. Simu-lated results of total compact LPDS can meet the re-quirements of ILC., Proceedings of the 10th Int. Particle Accelerator Conf., IPAC2019, Melbourne, Australia
- Published
- 2019
- Full Text
- View/download PDF
48. R of Copper Electroplating Process for Power Couplers: Effect of Microstructures on RRR
- Author
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Okii, Yuichi, Kako, Eiji, Michizono, Shinichiro, Taguchi, Junji, Takahashi, Hideharu, Yamamoto, Yasuchika, and Yasutake, Hiroto
- Subjects
SRF Technology - Ancillaries ,Accelerator Physics - Abstract
Power couplers for superconducting cavities are required to have both low-thermal conductivity and high-electrical conductivity, because high-thermal conductivity and low-electrical conductivity could generate unexpected increase for heat load. In order to combine these contrary properties, power couplers are made of stainless steel and plated with copper plating. As electrical conductivity of copper layer affects dynamic heat load, it is crucial to optimize plating processes. In this study, we investigated influences of plating parameters (i.e., thickness of copper layer, plating bath composition, bath temperature, heat-treatment conditions) on RRR by collaborative work among Nomura plating, CETD, and KEK. As a result, we obtained high-RRR samples with conditions noted below; (1) electroformed copper plate, (2) copper layer thickness of over 50 µm, and (3) heat-treatment at 200deg-1h, (4) other plating bath composition. In addition, we observed microstructures of several samples, then found that microstructures of copper layer are strongly related to RRR. In this paper, we will present the recent results for this investigation., Proceedings of the 19th International Conference on RF Superconductivity, SRF2019, Dresden, Germany
- Published
- 2019
- Full Text
- View/download PDF
49. Ceramic Study on RF Windows for Power Coupler, Waveguide, and Klystron in Particle Accelerator
- Author
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Yamamoto, Yasuchika and Michizono, Shinichiro
- Subjects
SRF Technology - Ancillaries ,Accelerator Physics - Abstract
R on different types of ceramic used in power coupler, waveguide, and klystron for particle accelerators are under progress in Center of Innovation (COI) at KEK, and at some outside companies. There are five important parameters on the properties of ceramics; that is, relative permittivity, dielectric loss tangent, surface and volume resistivity, and secondary electron emission coefficient. For measurements of these parameters, eight kinds of ceramic samples supplied from five vendors have been measured using three different measurement systems since 2017. In this report, the recent results for these studies will be presented in detail., Proceedings of the 19th International Conference on RF Superconductivity, SRF2019, Dresden, Germany
- Published
- 2019
- Full Text
- View/download PDF
50. Secondary electron emission of sapphire and anti-multipactor coatings at high temperature
- Author
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Michizono, Shinichiro, Saito, Yoshio, Suharyanto, Yamano, Yasushi, and Kobayashi, Shinichi
- Published
- 2004
- Full Text
- View/download PDF
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