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Home About Us History Member Facilities Laboratories Accelerator and Beam Physics Quark Nuclear Physics Radioactive-isotope Science Condensed Matter Nuclear Reaction For Users Announcement Research Proposals Machine schedule Facilities Radiation Safety Events ELPH Workshop ELPH Seminor Publications Annual Reports Call for papers Pamphlet For students For Students Contact & Access Contact Access Greetings (under construction) Greetings from the ELPH director   Welcome to the HP of the Research Center for Electron-Photon Science (ELPH), Tohoku University.   The Research Center for Electron Photon Science is a national joint usage/research center that has a high-energy (1.3 GeV) electron booster synchrotron and a high-intensity (10 kW) low-energy(70 MeV) electron linear accelerator. Our center has many domestic and international users (In particular, we accept graduate students) and promotes research and education.   The history of the Research Center for Electron Photon Science began in 1967 with the Laboratory for Nuclear Science (LNS), a facility attached to the Faculty of Science, which was established with a 300 MeV electron linac as a research base. Since its establishment, it has been conducting world-leading research, including nuclear physics and radiochemistry research using pulsed electron beams and the world&＃39;s first neutron diffraction experiments using pulsed neutrons. On December 1, 2009, the LNS was reorganized to form the Research Center for Electron Photon Science (ELPH), which started as a joint-use facility within Tohoku University. The following year, on July 1, 2010, the center was certified by the Ministry of Education, Culture, Sports, Science, and Technology as a joint usage/research center.    Recently, our laboratory conducted/promoted a wide variety of research projects, such as the discovery of dibaryons which were discovered by experiments conducted at the GeV-γ experimental facility, the precision measurement of proton radii using low-energy electron scattering, and the basic study of a wide variety of radioisotopes production. In addition, we are promoting joint research with domestic and overseas research institutes and exploring the possibility of various research collaborations.   To further revitalize the common usage and joint research center activities nationwide, it is essential to seek cooperation from domestic and overseas users more than ever and promote collaborative research that will become the seeds of innovation. We will actively incorporate the opinions and requests of the researcher community and strive to develop a more transparent and open operating system for the center. In addition, to meet the expectations of the research community and promote unique research that can only be carried out at this center, we would like to proceed with consideration and efforts toward the realization of a future project, including the renewal of the old electron accelerator. We request your continued support for the Research Center for Electron Photon Science activities.   Hiroaki Ohnishi Director Research Center for Electron Photon Science     --> History 2016 The 50th anniversary of the foundation. Apr 2015 Collaborative research division “Condensed Matter Nuclear Reaction” established. Jul 2014 Research building renovated and the Mikamine Hall completed. Dec 2013 Operation resumed after recovery from the Great East Japan Earthquake. Apr 2011 Approved as a Joint Usage/Research Center for Electron Photon Science. Mar 2011 Operation suspended due to damages by the Great East Japan Earthquake. Mar 2010 “Accelerator-based Light Source Building” completed. Dec 2009 Reorganized as “Research Center for Electron Photon Science”. Sep 2009 Electromagnetic calorimeter “FOREST” completed in the Gamma-ray Irradiation Room. Feb 2008 “High-frequency Power Source Building” completed. Sep 2006 Magnetic electrometer “NKS2” completed in the Second Experimental Room. May 2006 Electron-Positron test beam line operation started. Jul 2002 GeV Gamma-ray Irradiation building completed and started Hadron experiments. 1998 Organized as adjunct facility of Graduate School of Science. 1997 1.2 GeV Stretcher Booster Ring completed. 1988 World’s first observed coherent emission. 1982 150 MeV Pulse Stretcher completed. 1971 Pulse neutron source developed. 1967 300 MeV Electron LINAC completed. 1966 Established as an on-campus shared-use facility in nuclear physics.     Organization As of April 2023 Director :  Professor Hiroaki Ohnishi   --> Member April 2024 ※e-mail address: #####@raris.tohoku.ac.jp ※Telephone number: +81- 22-743-#### Academic staff list (RARIS-Mikamine) Name Title Research field e-mail tel Hiroaki OHNISHI Professor (Director of RARIS) Quark Nuclear Physics ohnishi 3423 Toshimi SUDA Professor Exotic Nuclear Physics suda 3420 Norihito MURAMATSU Professor Quark Nuclear Physics mura 3416 Yasuhiro IWAMURA Professor Condensed Matter Nuclear Reaction iwamura 3462 Shigeru KASHIWAGI Assoc. Prof. Beam physics/Accelerator Science kashiwagi 3434 Hidetoshi KIKUNAGA Assoc. Prof. Radiochemistry, Nuclear Chemistry kikunaga 3425 Fujio HINODE Assoc. Prof. Beam physics/Accelerator Science hinode 3424 Takehiko ITOH Assoc. Prof. Condensed Matter Nuclear Reaction [email protected] 3426 Yukie Maeda Assoc. Prof.       Manabu MIYABE Assis. Prof. Quark Nuclear Physics miyabe 3435 Toshiya MUTO Assis. Prof. Beam physics/Accelerator Science muto 3429 Atsushi TOKIYASU Assis. Prof. Quark Nuclear Physics tokiyasu 3422 Yuki HONDA Assis. Prof. Exotic Nuclear Physics honda 3417 Yuta SADA Assis. Prof. Quark Nuclear Physics sada 3416 --> Yuji MATSUMURA Assis. Prof. Quark Nuclear Physics matumura 3435 Takuya YOKOKITA Assis. Prof. Radiochemistry, Nuclear Chemistry yokokita 3436 Jirohta KASAGI Research Prof. Nuclear Physics, Condensed Matter Nuclear Reaction kasagi 3414 Hajime SHIMIZU Research Prof. Quark Nuclear Physics hshimizu 3414 Hiroyuki HAMA Research Professor Beam physics/Accelerator Science hama 3432 Academic staff list (Tohoku Univ.) Name Affiliation　/ 　Titele Research fields Hirokazu TAMURA Graduate school of Science, Department of physics, Professor Experimental Nuclear physics group Koji MIWA Graduate school of Science, Department of physics, Assoc. Professor Experimental Nuclear Physics group Masashi KANETA Graduate school of Science, Department of physics, Assoc. Professor Experimental Nuclear Physics group Shoichi Sasaki Graduate school of Science, Department of physics, Assoc. Professor Nuclear Theory Yasushi KINO Graduate school of Science, Department of chemistry, Professor Radiation Chemistry Nobuyuki UOZUMI Graduate school of Engineering, Department of physics, Professor Biomolecular Engineering Technical Staff Name e-mail tel Ken&＃39;ichi NANBU nanbu 3431 Ikurou NAGASAWA nagasawa 3431 Ken TAKAHASHI ken_takahashi 3431 Ken KANOMATA kanomata 3431 Koutaro SHIBATA shibata 3431 Yoshinobu SHIBASAKI shibasak 3453 Students Name 学年 所属グループ e-mail tel Hirotoshi SAITO D3 Beam physics/Accelerator Science hsaito 3422 Taihei AOYAGI D1 Exotic Nuclear Physics aoyagi   Chihiro YOSHIDA D1 Quark Nuclear Physics yoshida   Shota TAKAYAMA M2 Exotic Nuclear Physics takayama   Masahiro OKABE M2 Quark Nuclear Physics okabe   Nozomu MORITA M2 Beam physics/Accelerator Science morita   Hiroki YAMADA M2 Beam physics/Accelerator Science yamada   Masahiro TAKEYA M2 Condensed Matter Nuclear Reaction takeya   Hikari WAUKE M2 Exotic Nuclear Physics wauke   Yuto ISHIZUKI M1   ishizuki   Jumpei TAKAHASHI M1   jtakahashi   Daisuke TAKI M1   taki   Kento TERADA M1   terada   Hajime SAITO M1   hasaito   Masato TSURUTA M1   tsuruta   Ryota NISHIKAWA B4   rnishikawa   Kazuya NOBATA B4   nobata   --> Office Name e-mail Tel Office kakurike @ grp.tohoku.ac.jp 3400 Radiation Safety Office kanri @ lns.tohoku.ac.jp   Administration Office (Radiation Safety Office) Name e-mail Tel Administration Office kanri @   3411 --> Facilities High intensity electron linac               BST ring               Injector for BST               Chemistry Lab. (#3 experimental Lab.)                               NKS2               FOREST               RTAGX               t-ACTS                                           Accelerators and Beam properties In ELPH, the electron and photon beam lines are provided for nuclear physics experiments and a radioactive isotope production. (Present Configuration (2015)) High intensity electron linac The 300 MeV electron linear accelerator had been constructed in 1967. In the Great East Japan Earthquake (March 11, 2011), serious damages was inflicted on this linac and a low energy part of the linac was reconstructed as a high intensity electron linac. The linac consists of 90 keV thermionic cathode gun, a buncher section and eight 1m-long s-band accelerating structures. Maximum energy of the linac is 70 MeV without beam loading. The linac is operated with 300 Hz repetition rate and a peak current in macropulse is approximately 100 mA with 3 micro-sec pulse duration. The average beam current is about 100 micro-Ampere. This high current electron beam is used for radio isotope production by photonuclear reactions. Linac Energy Modulator Repetition Macropulse Peak Current Macropulse Duration Average Current 50 MeV 300 Hz 〜130 mA 3.0 µs 120 µA 30 MeV 300 Hz 〜100 mA 3.0 µs 90 µA Injector linac for BST Injector linac for the Booster synchrotron ring. Compact electron linac had been constructed as the injector for the booster synchrotron in 2012. The injector consists of a thermionic rf-gun, an alpha magnet, two s-band 3m-long accelerating structures, and transport line to the booster synchrotron. The maximum energy of injector is 90 MeV with beam loading. This linac has two beam lines for beam diagnostics, one is straight line and the other is 90 degree beam line with dispersion section. 1.3 GeV Booster-STorage ring (BST) Combined function magnet.  It looks like an ordinary quadrupole magnet but has a special pole-face shape to generate the sextupole component, and thus the chromaticity correction can be accomplished with these magnets by introducing the dispersion function to the magnet location. BST ring. The ring circumference is 50 m, and eight dipole magnets (blue pieces) deflect the electrons so as to guide the electron beam, while the focusing magnets (orange and red magnets) are used to keep the electrons circulating inside the vacuum chamber. BST is an electron synchrotron which accelerates the electrons injected from the injector linac up to 1.3 GeV in maximum. The required energy to accelerate and store the electron beam is supplied by a 500 MHz rf cavity. By inserting a very fine carbon wire to the beam orbit of circulating electrons after the acceleration, high energy gamma rays are generated via bremsstrahlung. Two beam lines are operational to utilize such gamma rays. In a typical operation pattern, beam acceleration is immediately started just after the injection and finished within ~2 sec., and then stored electrons with ring current of 10~30 mA are consumed to generate the gamma rays over a duration of about 10~40 sec. Currently available operation energy is 1.3, 1.0 and 0.8 GeV, and typical ring current is ~10～30 mA. Injection Beam Energy Injection Repetition Ring Top Energy Storage Beam Current 90 MeV ~0.05 Hz (typ.) 0.8~1.3 GeV ~30 mA Tagged photon beamline The BST ring has two beamlines providing tagged photons. The typical properties of the tagged photon beams are summarized in the table: Beam line Energy Range(Rint Energy: 1.3 GeV) # of Bins Intensity Duty BST-Tagger-I 0.8 ~ 1.26 GeV 160 TBC ~60% (NKS2) BST-Tagger-II 0.9 ~ 1.25 GeV 116 TBC ~50% (FOREST) Photon beamline I The photons are designed to be tagged with energies of 62%~98% with respect to the circulating electron energy of the BST ring. The number of tagging channels are 160. The details of the photon beam properties are under investigation. Please contact to Dr. M. Kaneta (mail: [email protected]). Photon beamline II The photons are designed to be tagged with energies of 62%~96% with respect to the circulating electron energy of the BST ring. The duty facto is approximately 50% (stable photon beam can be obtained for 8.5 s out of a 17 s cycle). The number of tagging channels are 116. The details of the photon beam properties are under investigation. Information before The Great East Japan Earthquake (March 11, 2011) can be obtained in a reference "The second GeV tagged photon beamline at ELPH" Reference: T. Ishikawa et al., Nucl. Instr. and Meth. A 622, 1 (2010). Please contact to Dr. A. Tokiyasu (tokiyasu-at-lns.tohoku.ac.jp -at- should be replaced with @). Positron/electron beamlines for testing detectors The positrons and electrons, which are produced at a metal plate in front of the bending magnet RTAGX by the photon beam, are provided at three beamlines in the GeV-γ experimental hall. The positrons and electrons are momentum-analyzed with RTAGX, and the energy spread of them is approximately 0.5% . The beam profile and intensity depend on the beam energy, and the diameter of the beam is roughly 20 mm, the intensity is roughly a few kHz. The positrons (or electrons) at the -30 deg beamline can be focused with a triplet quadrupole magnets thanks to a KEK cooperation. The polarity of the magnets can be changed. The details of the photon beam properties after the earthquake are under investigation. Information before can be obtained in a reference "A detailed test of a BSO calorimeter with 100-800 MeV positrons", Reference: T. Ishikawa et al., Nucl. Instr. and Meth. A 694, 348 (2012). Beam Beam line Maximum beam energy Positron / Electron ± 30 deg ~840 MeV Positron -23 deg ~1000 MeV Please contact to Dr. A. Tokiyasu (tokiyasu-at-lns.tohoku.ac.jp -at- should be replaced with @).               PAGE TOP 1-2-1 Mikamine, Taihaku-ku, Sendai, Miyagi 982-0826 Japan TEL: +81-22-743-3400　FAX: +81-22-743-3402 E-mail：[email protected]