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  • March 13, 2013: Issue 68 of ILC Communication (Japanese ILC Newsletter) is released.
  • December 15, 2012: International Linear Collider complets draft of its design report -- handover ceremony on 13 December, 2012 in Tokyo.
  • April 13, 2012: First beam acceleration with a superconducting linac of the Quantum-Beam Project at KEK STF was established at 15:31 today.
  • March 1, 2012: We started seeing an electron beam out of the RF gun at the Quantum-Beam Experiment that is ongoing at the STF building of KEK.
  • February 27, 2012: The quantum beam (QB) project at STF is preparing itself for start-up of the experiment.
  • January 25, 2012: Set-up work for the quantum beam (QB) experiment at STF is nearing completion.
  • October 14, 2011: Construction of the injector cryomodule equipped with two ILC-type 9-cell cavities has begun for the quantum beam (QB) experiment. The cavity string has been brought out of the clean room, ready for installation of tuners. The gas return pipe is being readied to be placed in the cold-mass assembly framework.
  • October 7, 2011: Construction of the injector cryomodule equipped with two ILC-type 9-cell cavities has begun for the quantum beam (QB) experiment.
  • September 23, 2011: Preparation is under way for the quantum beam (QB) experiment at KEK STF. Part of the beamline components have been placed in the undergorund tunnel. The CM-A (Cryomoulde-A) vessel is taken out of the area to make room for assembling the two-cavity short cryostat for the QB experiment.
  • September 7, 2011: KEK open house day was held on 2011/9/4.
  • August 10, 2011: Inauguration ceremony was held on July 13 for the new electron-beam welding machine at the cavity production test plant of KEK.
  • July 12, 2011: Cavity packages and input couplers for the injector system for use in the Quantum Beam Experiment have been delivered to KEK.
  • June 29, 2011: Test operation of the new electron beam welding (EBW) machine is on-going.
  • June 20, 2011: Operation of the new EBW machine at KEK has begun.
  • June 13, 2011: Cryomodules for the S1-Global experiment have been dismantled and brought out of the tunnel.
  • June 6, 2011: Installation of the EBW machine which was delivered earlier to KEK is in progress with engineers from the manufacturer from Germany.
  • May 20, 2011: Recovery work under way for the ATF and ATF2 at KEK.
  • April 14, 2011: An EBW (Electron-Beam Welding) machine was delivered from a German company to the Cavity Production Pilot Plant at KEK.
  • March 28, 2011: The server / is now back to production operation.
  • March 10, 2011: Annual meeting of the ILC Detector Study, supported in part by MEXT Grant-in-Aid for the Creative Scientific Research Program was held at KEK from March 9 through March 11, 2011.
  • March 3, 2011: TESLA Technology Collaboration Meeting was held from Feb. 28 through March 1, 2011 in Milano as hosted by University of Milan and INFN Sezione di Milano.
  • February 24, 2011: Waveguides in the Distributed RF System for testing during the S1-Global experiment. In this installation the anode-modulated klystrons and the coupler ports are placed on opposite sides of cryomodules. The waveguides are routed underneath the vacuum vessel of each cryomodule.
  • February 17, 2011: Research staff at the Control Room of KEK STF, where operation of the Distributed RF System is ongoing with the hardware equipment of the S1-Global experiment.
  • February 3, 2011: Installation of hardware equipment for DRFS (Distributed RF System) at STF of KEK has basically completed.
  • January 27, 2011: Production model of the 2-cell cavitiy for the beam injector to use at the compact-ERL experiment. Three sets of these cavities will be used in a common cryostat for the injector. They will accelerate an 100mA, 500kV/m beam from the electron gun up to 10MV/m in a CW mode.
  • January 20, 2011: 11th ATF2 project meeting was held at SLAC on January 13-14, 2011.
  • January 13, 2011: Installation of hardware equipment for DRFS (Distributed RF System) at STF has begun. DRFS is a version of the RF system which is based on relatively low-power (approx 800kW) modulating anode klystrons (MA klystrons) each of which drives two or four 9-cell cavities. The MA klystrons, anode modulators and their DC power supplies are expected to be built compact enough such that an entire accelerator hardware system, including both the cryostat-cavities and RF-sources can fit within a single tunnel.
  • January 6, 2011: See entry for December 30, 2010.
  • January 1, 2011: Season's Greetings for 2011: Year of the Rabbit (Chinese Animal Zodiac).
  • December 30, 2010: An EP Test Bench is being newly set up within the Chemical Laboratory building of KEK's Tsukuba Campus. This test bench is for conducting various studies of electro-polishing processes with small metal samples. It is intended to supplement the work at the EP facility for superconducting cavities with a small-scale and flexible laboratory with a fast turn-around in a well-controlled environment.
  • December 23, 2010: Simultaneous pulsed RF operation of S1-Global cavities at STF. Research staff in the control area on the surface floor. Due to the fact that tuners on two cavities are defunct, only seven out of eight cavities can be simultaenously high-power operated from a single RF power source (one remaining cavity has to be left detuned). An average gradient of 24MV/m - 26MV/m was achieved.
  • December 16, 2010: Several physicists from KEK and U.Kyoto visited IHEP, Beijing to discuss on Japan-China Collaboration on SRF Technologies for the ILC.
  • December 9, 2010: The first "dumb-bell", which was built with half-cups of niobium sheets that have been forged by using the new press machine at the cavity production test plant of KEK. A dumb-bell refers to an object, which is made of a pair of half-cups, facing each other at their irises where they are electron-beam welded. A nine-cell cavity would then be built by joining eight such dumb-bells and two units of endgroup cells. The dumb-bell shown here was electron-beam welded at a contractor's site for studying the adequate parameters for the welding operation. The work will continue to exercise the manufacturing technique with a new electron-beam welding machine which is expected to be installed at KEK in early 2011.
  • December 3, 2010: All of the eight 9-cell cavities have been hooked up to high-power RF waveguides now, and are being readied for simultaneous pulsed operation in the S1-Global experiment at STF. Image at the top: Cryomodule-C, contributed by INFN/U.Milano with cavity and tuner components from DESY, INFN/U.Milano, Saclay, FNAL. Image at the bottom: Cryomodule-A, contributed by KEK with cavity and tuner components built by the Japanese industry under the leadership of KEK.
  • November 26, 2010: The first instance of a nine-cell cavity for the ILC at KEK, where the ILC cavity production specifications are fully met, i.e. Eacc = 31.5MV/m with Q0 > 1E10 and Eacc = 35MV/m with Q0 = 8E9 ! This was achieved in early evening of 2010/11/25 with #13 cavity, manufactured by MHI, Co. Ltd., which was surface-treated (Electro-polishing and rinsing) and vertical-tested at the Superconducting RF Test Facility (STF) of KEK.
  • November 18, 2010: Colleagues from FNAL and KEK are engaged in the commissioing effort on an automated cavity tuning machine (previous link 1, link 2, link 3) at STF, which has been built through a DESY-FNAL-KEK cooperation.
  • November 11, 2010: One of the important topics of the ILC design studies is to figure out the layout of the accelerator components in the underground tunnel. This requires us to establish the clearance among each of the components as well as with respect to the inner walls of the tunnel. Two sets of wooden mock-ups were built so as to present part of the inner surfaces of the ILC tunnel (inner diameter tentatively set to be 5.7m), and have been placed in the underground accelerator housing of the STF. Scientists and engieers this morning gethered to assess the clearance issues between the ILC cryomodules and tunnel walls.
  • October 28, 2010: Set up work is under way for anode-modulated klystrons for testing the system concept of DRFS (Distributed RF System) at STF.
  • October 14, 2010: Scenes from the on-going S1Global experiment with collaborators from FNAL, working on the piezo compensation of Lorentz force detuning of cavities during pulsed RF operation.
  • October 7, 2010: A new 3.5-wavelength cavity for the RF gun of the ATF injector linac.
  • September 30, 2010: The niobium half cells, for building L-band superconducting cavities, that were deep-drawn with the press machine at KEK in the week of 2010/9/21.
  • September 24, 2010: Deep drawing of half-cells for L-band cavities with the new press machine at KEK. Test operation of the 150t press machine is under way at the cavity production pilot plat. Dozens of cells have been drawn out of Nb disk sheets in the recent past. The focus topic of this study is to optimize the shapes of the dies to use for producing mid-cells of TESLA-style cavities to build at KEK and elsewhere in the near future.
  • September 16, 2010: Cryomodules-A and C are currently being cooled down. Pulsed RF test of 8 units of 9-cell cavities is expected to begin next week (week of Sep. 20), first with ageing run of cold portions of the input couplers.
  • September 9, 2010: KEK held an Open-House Day on 2010/9/5, collecting some 3,300 visitors to see what this laboratory is doing.
  • September 2, 2010: An automated cavity tuning machine, manufactured through a DESY-FNAL-KEK collaboration was delivered from FNAL. This new tuning machine, which is temporarily displayed in the cryomodule assembly area of KEK STF, will be eventually installed near the vertical test stand in a few months.
  • August 26, 2010: RF-processing is under way for the input couplers for L-band cavities in the S1-global experiment. The RF-processing in this case is being done with pulsed RF power (typically up to 1ms, 400kW) from an L-band klystron while the cavities are in a room-temperature condition (thus, the so-called total-reflection condition).
  • July 29, 2010: Installation of the 4-mirror laser cavity system has begun in the north straight section of the ATF damping ring. A new laser cavity was delievered from CELICA and LAL to KEK, and will be used for continued pilot studies of positron production (polarized) with laser-electron Compton scattering.
  • July 22, 2010: RF Gun for the Quantum Beam Program and the Phase-2 of STF: Cathode substrate made of Molibdenum is being heat-processed for cleaning its surface.
  • July 15, 2010: Sub-assemblies of the components to use with 9-cell cavities, MHI-12 and MHI-13, for the Quantum-Beam experiment at STF have been delivered to KEK from Mitshibishi Heavy Industries for interim inspection. The so-called "dumb-bells", end-cells, end-groups, base-plates, and magnetic shields pieces.
  • July 8, 2010: Colleagues from INFN Milano-LASA and FNAL are now joining the low-power testing of cavities at the cryogenic temperature.
  • July 1, 2010: Cryomodules and the RF waveguides for the S1-global experiment as of 2010/6/30.
  • June 24, 2010: Preparation for S1-Global Experiment. Check-out of cavities in Cryomodules-A and C has begun with low-power RF at the cryogenic temperature.
  • June 17, 2010: Preparation for the S1-Global Experient. Installation is under way for the waveguide system of the Cryomodule-C
  • June 10, 2010: Cryomodules A and C for the S1-Global Experiment at STF of KEK started thei first cool down exercise.
  • June 3, 2010: Asian Single Tunnel Design Review at KEK.
  • May 27, 2010: The vacuum vessels for Cryomodules-A and C have been closed up. As of May 26, it was confirmed that no leak is detected on the outer vacuum vessel and inner piping.
  • May 20, 2010: Inteconnection between Cryomodules-A and C is done. Istallation of the warm portions of the input couplers for the cavities of Cryomodule-A is also done, except the so-called door-knob elememts.
  • May 13, 2010: Progress of the inter-connection work of Cryomodules A and C. As of May 12, most of the welding work is completed and leak check is under way for welding junctions of cryogenic piping.
  • May 6, 2010: Assembly of Cryomodule-A is basically done, and the module has been brought into the underground tunnel. Cryomodule-C (yellow) and -A (orange) are now placed next to each other, awaiting interconnection work of cryogenic piping and vacuum systems.
  • April 29, 2010: Visit to ICB of FNAL for application of KEK-style mold replication method on AES001.
  • April 22, 2010: RF gun cavity for the electron source to use at the Quantum Beam experiment (and then at the STF Phase-2) is being readied for RF processing, which was started at the end of 2010/4/16.
  • April 15, 2010: Cavity Production Pilot Plant under construction. It is being built inside a clean room area of approximately 14 m x 19 m, created within the former PS Energy Center which was refurbished in 2009. It will feature a press machine with a capacity of 150t, a cell trimming machine based on a CNC lathe, a set of equipment for chemical polishing, an electron beam welding machine and associated hardware. As of April 2010, the clean room floor is basically ready and a lathe and a press machine have been installed. An EBW machine will be installed in early Spring of 2011.
  • April 8, 2010: String of Japanese-made cavities (MHI05, 06, 07, 09) have their tuners installed and brought under the gas return pipe.
  • April 1, 2010: GDE Meeting in Beijing was held on 2010/3/26-30.
  • March 25, 2010: Installation and check-out of frequency tuners for Japanese-made cavities for the S1-global experiment is under way.
  • March 18, 2010: Work in progress on Cryomodule-C for the S1-Global experiment.
  • March 11, 2010: Cavity string for Cryomodule-A is brought out of the clean room.
  • March 4, 2010: String assembly in progress for Japanese-made cavities for Cryomodule-A of the Global-S1 experiment.
  • February 25, 2010: Japanese-made cavities in preparation for the S1-global experiment. Before the cavities enter the clean room, their exeterior has to be rinsed with pure water. Then in the Class-6 section of the STF clean room, they are dried and are placed in order. Installation of cold parts of the input couplers and subsequent stringing assembly will take place next week (week of 2010/3/1).
  • February 18, 2010: Four cavity packages arrived at KEK from Kobe Shipyard of Mitsubishi Heavy Industries on 2010/2/16. These are the cavities to be assembled into Cryomodule-A as part of the S1-global experiment. The cavities are, from the front, MHI-06, 05, 07 and 09.
  • February 11, 2010: Staff from INFN Milano-LASA, FNAL and KEK who participated in installation work of frequency tuners on S1-global cavities - AES004, ACC011, Z108 and Z109.
  • February 4, 2010: Parts of the "blade tuners", developed and delivered by INFN Milano-LASA, to use with 9-cell cavities from FNAL (ACC011 and AES004) at the S1-global experiment.
  • January 28, 2010: Four cavities from DESY and FNAL have their string assmbly completed, and now are brought out of the clean room. They are awaiting the welding work of LHe supply pipes, to be followed by installation of tuners. The cavities shown in this shot are: (from left to right) Z109, Z108, ACC011 and AES004.
  • January 21, 2010: String assembly of two units of DESY cavities and two units of FNAL cavities was completed by crew from DESY, FNAL and KEK in the week of 2010/1/18.
  • January 14, 2010: Components for Cryomodule-C from INFN, Frascati, two units of 9-cell cavities from DESY, Germany, and two units of 9-cell cavities from FNAL, USA, all for the S1-global experiment.
  • January 7, 2010: Vacuum vessel and associated components for Cryomodule-C to use at the S1-global experiment arrived at KEK from INFN, Italy.
  • January 1, 2010: Seasons's greetings for 2010: Year of the Tiger (Chinese Animal Zodiac).
  • December 24, 2009: Input couplers for S1-global experiment under RF processing.
  • December 17, 2009: Processing chamber for the cathod materials of the RF gun to use at the Quantum-Beam experiment and at the Phase-2 Experiment of STF.
  • December 10, 2009: Two units of DESY cavity packages (Z108, Z109) to use at the S1-global experiment. The cavities, shipped from DESY, arrived KEK on December 3, 2009.
  • December 2, 2009: Sample disk of large-grain niobium, from which test pieces have been taken, with a wire-cut method, for strength measurements.
  • November 26, 2009: Nearly completed construction of EP2, extension of the electro-polishing facility at STF. An outside view seen from near the entrance (top), and the downstairs portion of the new EP stand and associated resovoir, heat exchanger and piping.
  • November 19, 2009: Prototype of a cathode plug assembly for use with the RF gun at STF. The cathode surface is to be formed by a thin film of CsTe. Inconel 750 is used for the RF contact to maintain the elasiticity during heat processing of the cathode
  • November 12, 2009: Beam extraction test with a fast kicker prototype at ATF damping ring. Two units of stripline kickers were installed, temporarily replacing the conventional extraction kicker which has been put offline. A successful beam extraction was demonstrated in beam operation of October, 2009.
  • November 5, 2009: Input coupler subasselies for L-band cavities to use at the S1-global experiment for ILC.
  • October 29, 2009: Components for HOM couplers of 9-cell cavities in an early stage of manufacturing. Deep-draing and burring proccesses ahve been applied to niobium disks.
  • October 22, 2009: A 180-degree panorama view of the ATF2 beamline.
  • October 16, 2009: A 9-cell cavity #7 from MHI during vertical testing on 2009/10/15 recorded Eacc = 33.6MV/m with Q0 = 4.8E9.
  • October 15, 2009: ATF2 beamline in preparation for the Fall run of 2009. Water tube tiltmeter has been installed on quadrupole magnets
  • October 8, 2009: 9-cell cavity (MHI #9) in preparation for vertical testing later at KEK STF. This is one of the candidate cavities to use at the upcoming S1-global experiment.
  • October 1, 2009: Beam size monitor based on compton scattering of laser interference pattern at the final focus point of ATF2.
  • September 24, 2009: Autumn break.
  • September 17, 2009: As part of post-mortem studies of STF Phase-1 which was completed earlier, the cavities from this experiment are undergoing a tune measurement for confirming the resonant frequencies.
  • September 10, 2009: KEK Open House of 2009/9/6.
  • September 3, 2009: Working area for the Electro-polishing (EP) facility at KEK as of early September, 2009.
  • August 27, 2009: The 9-cell cavities to use in the S1-global program in 2009-10. From the front, MHI0-9, MHI-08 and MHI-06.
  • August 13, 2009: Postmortem inspection of STF Phase-1 cavities with the Kyoto Camera system.
  • August 6, 2009: Cut-away parts of input couplers which were used in the Phase-1 experiment of TESLA-like 9-cell cavities.
  • July 30, 2009: Cold mass of Cryomodule B under reconfiguring work for test study with a single, rather than two, layer of heat shield.
  • July 23, 2009: Pilot study of the hardware required for an interferometer-based stability monitoring system for the IP steering feedback BPMs.
  • July 16, 2009: MONALISA installation at ATF2.
  • July 9, 2009: TESLA-like cavity #8 being readied for vertical testing. PIN diodes are introduced at the irises and at the top flange for monitoring field emission activities.
  • July 2, 2009: NbTi-Ti samples used for Charpy impact test. These samples (#07, #08, #09) were Charpy-tested at the liquid helium temperature to quantify the mechanical strengths of the materials to use in cryomodule prototypes for ILC.
  • June 25, 2009: June break.
  • June 18, 2009: RF Stations 1 and 2 at STF of KEK.
  • June 11, 2009: A new prototype for a "local grinder" mechanics for fixing deffective inner surfaces of cavities.
  • June 4, 2009: New type of thermal sensors, developed by Kyoto-KEK collaboration, to try with vertical testing of 9-cell cavities.
  • May 28, 2009: Lecture note on superconducting cavities (S.Noguchi) has been posted.
  • May 21, 2009: 2nd prototype of the 2-cell L-band injector cavity for the compact-ERL project.
  • May 13, 2009: KEK Report 2009-3 -- STF Phase-1 Activity Report -- is available (Japanese only).
  • April 30, 2009: Variable couplers for the L-band cavities to use at the S1-global experiment at STF. Cold (left) and warm (right) portions are shown.
  • April 23, 2009: Participants at the TILC09 meeting. April 17, 2009.
  • April 16, 2009: Break for the spring which is rapidly passing by.
  • April 9, 2009: TILC09 meeting starts on April 17, 2009 (Friday next week).
  • April 2, 2009: Two-cell cavity prorotype for the compact ERL project at KEK, in prepration for vertical testing (VT).
  • March 26, 2009: Cryomodule-B is now placed in the tunnel for studies of the remnant magnetic field within the cold mass volume and variations of component locations during cool-down.
  • March 19, 2009: Installation of an L-band klystron on the RF station #2 of STF, as returned from repair work by Thales company.
  • March 12, 2009: Expansion work is in progress for the floor space for cavity surface processing, such as electropolishing (EP). The original work space occupied 20m x 6m. An additional 10m x 6m is being prepared.
  • March 5, 2009: The cold mass for Cryomodule-B, which has ben reassembled in a special test configuration.
  • February 26, 2009: A close-up view of the opening of the wire position monitor inside the cold mass of an STF cryomodule.
  • Feb. 19, 2009: Measurements are under way for motions of cavity tuner elements while piezo tuners are being activated.
  • Feb. 12, 2009: RF testing of the LAL input couplers (TTF5 design, derived from DESY work as part of CARE program, built by ACCEL company) is in progress.
  • Feb. 5, 2009: Now that the Phase-1 program of STF has been concluded, the Cryomodule-B (used to be for Low-Loss cavities) is temporarily disassembled for next steps of research activities.
  • Jan. 29, 2009: The baseline superconducing cavity (TESLA-like design) enclosed within a magnetic shield to use for cavity-packaging, for a special test of the performance of the shield.
  • Jan. 22, 2009: Two units of high-power couplers to use with L-band superconducting cavities, sent from LAL, France to KEK, Japan.
  • Jan. 15, 2009: Prototype mechanics under test development for sponge-cleaning of inner surfaces of single-cell cavities.
  • Jan. 8, 2009: Beam extraction test with a fast kicker prototype at ATF damping ring. Two units of stripline kickers have been installed, temporarily replacing the conventional extraction kicker which has been put offline.
  • Jan. 1, 2009: Season's greetings for 2009, the year of Cow.
  • Dec. 25, 2008: TESLA-type (linear-type) power distribution system for testing at KEK STF.
  • Dec. 18, 2008: A Participants in the 7th ATF2 meeting at KEK.
  • Dec. 11, 2008: A vector-sum control experiment with four cavities in the cryomodule-A at STF.
  • Dec. 4, 2008: The TESLA-like cavity #5 has completed its initial EP/HPWR processing last week (week of Nov. 24) and this week it was installed into the vertical test pit for its first vertical testing (Dec. 3). This is the first Japanese-made 9-cell cavity taht is intended for use in the so-called S1-global experiment of ILC/GDE.
  • Nov 27, 2008: Progress with the horizontal cryostat (CM-A) at KEK STF in pulsed RF operation from the week of 2008/11/17. In operating conditions with RF pulse width = 1.5ms, pulse repetition rate = 5Hz, Offset detuning = +300Hz, RF feedback = on, an accelerating field gradient of 32.0MV/m was obtained with piezo compensation turned off, and 30.8MV/m with piezo compensation turned on.
  • Nov 20, 2008: A special cavity with six, penetrating circular holes to accommodate detachable sample niobium pieces. After going through a series of surface processing such as CP, EP and HPWR, the test pieces are removed from the cavity and are examined with a scanning microscope, X-ray photoelectron spectroscopy (XPS) and others.
  • Nov 13, 2008: First prototype of a local grinder mechanics for repairing defective inner surfaces of superconducting cavities.
  • Nov 6, 2008: Surface processing (electro-polishing on the left, high-pressure water rinsing on the right) of a 9-cell cavity AES#001 at STF.
  • Oct 30, 2008: During a pulsed RF operation of TESLA-like cavities in a horizontal cryostat at STF, the cavity #2 recorded an accelerating field of 30.1MV/m for 1.5ms pulses at 5Hz on 2008/10/30. The picture above shows the scope traces during the measurement. Blue: Input power; Light blue: Input phase; Green: Relative phase of transmitted power; Magenta: Accelerating field. RF feedback is turned on, while piezo compensation is not yet activiated.
  • Oct 23, 2008: ATF: Construction of the ATF2 and the new beam extracition is nearing completion.
  • Oct 16, 2008: STF: Vertical testing in progress at KEK for an L-band 9-cell cavity (AES#001 from FNAL).
  • Oct 7, 2008: Congratulations to Profs Makoto Kobayashi, Toshihide Maskawa, and Yoichiro Nambu for receiving the Nobel Prize in Physics of 2008.
  • Oct 1, 2008: Installation is under way for the final quadrupole magnets at the downstream end of the ATF2 beamline.
  • Sep 25, 2008: Installation is under way for the final quadrupole magnets at the downstream end of the ATF2 beamline.
  • Sep 18, 2008: Installation is under way for the base-plates of the final quadrupole magnets at the downstream end of the ATF2 beamline.
  • Sep 11, 2008: Optical cavity for R/D of laser-compton system at the North straight line of the ATF damping ring.
  • Sep 4, 2008: Installation of ATF2 nearing the final stage.
  • Aug 28, 2008: Cryomodule-A with RF waveguides connected to four TESLA-like cavities.
  • Aug 21, 2008: North straight section of the ATF damping ring near the septum magnets.
  • Aug 14, 2008: Summer break: Lotus flower at Koga city park.
  • Aug 7, 2008: STF: Installation of L-band waveguide system for four cavities of STF phase-1.
  • July 31, 2008: STF: Material strength test in low-temperature environments.
  • July 24, 2008: Nb test piece for measuring its strength in a 2K environment.
  • July 10, 2008: Prof. Yoji Totsuka, former director of KEK, passed away today, Thursday, July 10. Prof Totsuka pushed us ahead at the time of ILC technology decision and the launch of the Global Design Efforts for ILC. Our thoughts are with him and with his family.
  • July 10, 2008: Inside view of 9-cell cavity AC71 (on loan to KEK through courtesy of DESY) and a new version of the surface inspection camera.
  • July 3, 2008: Work in progress at STF and ATF.
  • June 26, 2008: Installation of warm windows of input couplers for four cavities of Cryomodule-A at STF.
  • June 19, 2008: Thermal sensors installed on a 9-cell cavity for vertical testing.
  • June 12, 2008: Re-arrangement work is under way for the beam extraction line of ATF.
  • June 5, 2008: Low-power RF measurement at 4.2K of one of four TESLA-like cavities in Cryomodule-A.
  • May 29, 2008: Collaborator from SLAC (US) at calibration work on the BPM electronics of the new final-focus test beamline at ATF.
  • May 22, 2008: Fitting test of a 9-cell cavity (AES#001) at the new HPR facility of STF.
  • May 15, 2008: Construction in progress for the Final-focus test beamline at ATF.
  • May 8, 2008: An assembly of TESLA-like 9-cell cavity.
  • May 1, 2008: An assembly of TESLA-like 9-cell cavity.
  • Apr. 24, 2008: Fitting test of a 9-cell cavity in the new vertical test tand at STF.
  • Apr. 17, 2008: Final focus and beam dump area of ATF2.
  • Apr. 10, 2008: Spring night scene in front of Bldg.3 of KEK.
  • Apr. 3, 2008: A 9-cell cavity (AES#001 from FNAL) in the new cavity repository at STF vertical test stand.
  • March 27, 2008: Spring break. Ume (Prunus Mume) Garden of Mt. Tsukuba.
  • March 20, 2008: Beam dump area of the final focus test beamline at ATF.
  • March 13, 2008: Preparation of a 9-cell cavity (AES #001 from FNAL) for a test of electro-polishing at STF EP facility.
  • March 7, 2008: Participants at TILC08 (Sendai, March, 2008).
  • Feb. 28, 2008: Crew at the EP facility of STF. Intermediate rinsing is under way after attempting a test etching process of 60 microns on a 9-cell cavity.
  • Feb. 21, 2008: High-resolution surface inspection camera for SC cavities at Kyoto Univ.
  • Feb. 14, 2008: Four units of TESLA-like cavities in a cold-mass assembly. More progress.
  • Feb. 7, 2008: Four units of TESLA-like cavities in a cold-mass assembly.
  • Jan. 31, 2008: String assembly of 4 units of TESLA-like cavities.
  • Jan. 24, 2008: Vertical test stand at STF, with one cryostat installed.
  • Jan. 17, 2008: Cryomodule B (LL-cavity) is being transferred to the tunnel.
  • Jan. 10, 2008: Quadrupole magnets have been placed on the movers at the final focus test beamline at ATF.
  • Jan. 1, 2008: Greetings for the New Year 2008: Year of the Rats.
  • Dec. 27, 2007: STF: Installation of a vertical cryostat in the test bench.
  • Dec. 20, 2007: Participants at the ILC Damping Ring Mini Workshop for GDE at KEK.
  • Dec. 13, 2007: Installation of concrete girders (support blocks for magnets) has begun for the final focus test line (aka ATF2) at ATF.
  • Dec. 6, 2007: Working area for the new SRF cavity vertical testing facility under preparation in the STF building at KEK. Latest view, as of the week of Dec. 6.
  • Nov. 29, 2007: Autumn break. Scene from Mt.Tsukuba during the Thanksgiving weekend.
  • Nov. 22, 2007: Scope traces of monitored signals during a pulsed RF opeation (5Hz) of a TESLA-like cavity in a horizontal cryostat at STF.
  • Nov. 15, 2007: Working area for the new SRF cavity vertical testing facility under preparation in the STF building at KEK.
  • Nov. 8, 2007: Manipulation exercise of the electrode for EP processing.
  • Nov. 1, 2007: Mark-up has been made for locations of magnets on the floor.
  • Oct. 25, 2007: View from the south-east arc section of the ATF damping ring.
  • Oct. 18, 2007: Measurement of baseline cavity during the first 4K cool-down test of the STF cryomodule.
  • Oct. 11, 2007: Some kind of "beam delivery". Installation of concrete shield blocks for the new final focus beamline at ATF.
  • Oct. 4, 2007: Inside Bouncer Modulator (STF at KEK).
  • Sep. 27, 2007: Floor refurbishment work is nearly completed in the KEK Assembly Hall for construction of ATF2.
  • Sep. 20, 2007: Progress of floor refurbishment work in the KEK Assembly Hall for construction of ATF2.
  • Sep. 13, 2007: Kick-off Meeting for Engineering Design Efforts.
  • Sep. 6, 2007: New junction under welding for the tranfer tube onto STF Cryomodule-A.
  • Aug. 30, 2007: Progress of floor refurbishment work in the Assembly Hall building for construction of ATF2.
  • Aug. 23, 2007: Beam extraction line of ATF at KEK.
  • Aug. 16, 2007: Input coupler under RF processing on a cavity (LL-design) at STF cryomodule B.
  • Aug. 9, 2007: Sunflower farm near Mt.Tsukuba in summer.
  • Aug. 2, 2007: Measurement of HOM characteristics of a 9-cell cavity.
  • July 25, 2007: Input coupler connected to a cavity (baseline design) at STF cryomodule A.
  • July 19, 2007: Visiting scientists at KEK LC group from the Asian Region.
  • July 12, 2007: Reconstruction work of the floor in the Assembly Hall building for ATF2.
  • July 6, 2007: Reconstruction work of the floor in the Assembly Hall building for ATF2.
  • June 28, 2007: New vertical test stand in preparation in the STF building.
  • June 21, 2007: Floor space of KEK's Assembly Hall building is being cleared for construction of ATF2.
  • June 14, 2007: Nearly-completed EP facility at STF.
  • June 7, 2007: Prototype laser cavity for testing the concept of Compton-based polarized positron production system at ATF.
  • May 31, 2007: Spring morning breaks over Mt.Tsukuba.
  • May 25, 2007: STF cryomodule under a pumping test.
  • May 17, 2007: L-band waveguide system in test assembly for STF.
  • May 10, 2007: Necking machine for fabriaction of seamless multi-cell cavities.
  • Apr.26, 2007: Cold box now placed in the accelerator tunnel at STF.
  • Apr.19, 2007: New high-pressure water rinsing system under preparation for STF.
  • Apr.12, 2007: Cold box under construction for STF.
  • Apr. 5, 2007: Dresssed cavity subassemblies (TESLA-style) for STF.
  • Mar. 29, 2007: Waveguide system in installation for STF.
  • Mar. 22, 2007: New 9-cell cavities (ICHIRO-type) for S0 Program of GDE.
  • Mar. 15, 2007: Research staff at STF.
  • Mar. 8, 2007: A Spring Break. Ume Garden of Mt.Tsukuba.
  • Mar. 1, 2007: Liq-He transfer tube in installation in the STF tunnel.
  • Feb. 23, 2007: One of the Baseline 9-cell cavities records max 28.5MV/m in vertical test!
  • Feb. 22, 2007: Liq-He transfer tube in installation in the STF tunnel.
  • Feb. 15, 2007: Platform for EP and HPWR cavity processing systems at STF under preparation.
  • Feb. 8, 2007: ILC schematics
  • Feb. 1, 2007: Assembly work in progress for cryomodules at STF.
  • Jan.25, 2007: Assembly work in progress for cryomodules at STF.
  • Jan.18, 2007: Assembly work in progress for cryomodules at STF.
  • Jan.11, 2007: Cryostat for ICHIRO cavity being lowered into the accelerator housing of STF.
  • Jan.4, 2007: Outer frame for an ultra-pure water rinsing system is positioned inside STF building at KEK.
  • Dec.28, 2006: ICHIRO cavity, inside 5K shield, installed under GRP.
  • Dec.25, 2006: Season's Greetings. Christmas Eve at Tsukuba Center.
  • Dec.21, 2006: Participants at the ATF meeting at KEK.
  • Dec.14, 2006: Assembly of STF cryomodule.
  • Dec.7, 2006: A TESLA-style 9-cell cavity now inside a 5K shield.
  • Dec.1, 2006: Completed assembly of the IP BPM under development for ATF2.
  • Nov.23, 2006: A TESLA-style 9-cell cavity built by a KEK group installed under GRP of an STF cryomodule.
  • Nov.17, 2006: Input coupler being installed on a TESLA-style baseline 9-cell cavity.
  • Nov.12, 2006: GDE Meeting at Valencia.
  • Nov.2, 2006: 3-D rendition of a cavity package for ILC.
  • Oct.26, 2006: Scientist in charge of the laser system for the ATF photo-cathode RF gun and his hardware.
  • Oct.19, 2006: Assembly of coaxial ball-screw tuner for ICHIRO cavity under development at KEK.
  • Oct.12, 2006: Former KEK Director, Prof.Y.Totsuka visited ILC group at KEK.
  • Oct.5, 2006: Prototype components for the ultra-high precision cavity BPM to use at ATF2.
  • Sep.29, 2006: Participants at the TTC Meeting at KEK. Sep.27, 2006.
  • Sep.21, 2006: 3-D rendition of a conceptual design of the ILC cryomodule. Aug.26, 2006.
  • Sep.14, 2006: Inside view of an L-band 9-cell cavity, Sep. 8, 2006.
  • Sep. 7, 2006: Snapshots from KEK Open House, Sep. 3, 2006.
  • Aug. 31, 2006: Annual Accelerator Seminar, Oho'06.
  • Aug. 24, 2006: South straight section of the ATF Damping Ring, near the extraction ports for synchrotron radiation for beam diagnosis.
  • Aug. 17, 2006: Photos of STF building, both inside and outside.
  • Aug. 10, 2006: Half-cups for L-band cavities made of large-grain Niobium sheets.
  • Aug. 3, 2006: Grinding chips to use for the centrifugal barrel polishing of the inner surfaces of superconducting cavities.
  • July 27, 2006: Single-cell (ICHIRO design) cavities in stock, for "tight-loop" expriments of surface processing and high-gradient testing.
  • July 20, 2006: East arc section and beam injection line at ATF damping ring.
  • July 13, 2006: New clean room for assembly of cryomodules in the STF area.
  • July 6, 2006: Setup for testing the concept of ultra-fast kickers for use at ILC damping rings.
  • June 29, 2006: Input couplers for high-gradient cavities (ICHIRO design) under testing.
  • June 22, 2006: Accelerating RF cavities (normalconducting, 714MHz) at the ATF Damping Ring.
  • June 15, 2006: A test copper model of a 3-cell structure, which was fabricated with a hydro-forming method.
  • June 8, 2006: Snapshot from a daily operation meeting at the ATF control room.
  • June 1, 2006: The enclosure (vacuum vessel) of a cryomodule under construction for STF at KEK.
  • May 25, 2006: Participants at the International Accelerator School for Linear Collider held in Hayama.
  • May 18, 2006: S-band injector linac (overview and SLED system) at ATF.
  • May 11, 2006: A cavity module (ICHIRO design) placed in a horizontal setup for test operation of tuners at LN2 temerature.
  • May 4, 2006: "Necking test" as part of studies for building multi-cell cavities without heavily relying on costly EBW processes.
  • April 26, 2006: Cavity BPM subassemblies which have been built for use at ATF2 by colleagues at Pohang Accelerator Laboratory, Korea.
  • April 18, 2006: "Laser-wire" beam profile monitor at the ATF beam extraction line.
  • April 13, 2006: Input couplers for the L-band baseline cavities under RF processing.
  • April 8, 2006: Completed subassemblies of input couplers for L-band accelerator cavities.
  • April 4, 2006: A scene in front of Building 3, KEK.
  • March 30, 2006: A batch of quadrupole magnets build by collaborators of IHEP, Beijing, delivered for ATF2 at KEK.
  • March 24, 2006: Three units of L-band 9-cell cavities (TESLA design) built by the KEK group in 2005-2006.
  • March 18, 2006: Snapshots from GDE meeting at Bangalore, India.
  • March 3, 2006: 9-cell cavity (LL "Ichiro" style) on pre-tuning setup.
  • Feb. 27, 2006: An L-band 9-cell cavity being installed for vertical testing.
  • Feb. 17, 2006: An L-band 5MW klystron and the RF waveguide system installed at STF.
  • Jan. 28, 2006: TESLA-style 9-cell cavity in pre-tuning setup; The FONT experiment setup at ATF.
  • Jan. 18, 2006: 51MV/m accelerating gradient achieved with an LL single-cell cavity.
  • Dec. 29, 2005: ARC section of the ATF damping ring; TESLA-style 9-cell cavity in pre-tuning setup.
  • Dec. 19, 2005: TESLA-style 9-cell cavity in pre-tuning setup; A new beam extraction kicker at the ATF damping ring.
  • Nov. 26, 2005: TESLA-style 9-cell cavity in barrel polishing setup; ICHIRO 9-cell cavity in pretuning setup.
  • Sep.10, 2005: High-gradient record marked with a reentrant single-cell cavity and a low-loss single-cell cavity.
  • August 11, 2005: Test assembly of a coaxial ball screw tuner which has been built for an L-band 9-cell cavity.
  • June 24, 2005: A refurbished 5MW L-band klystron under testing.
  • June 21, 2005: The second fabrication of "ICHIRO" L-band 9-cell cavity.
  • May 14, 2005: The first fabrication model of "ICHIRO" L-band 9-cell cavity.
  • Dec. 12, 2004: Web-link topology around
  • Nov. 21, 2004: Participants at the 1st ILC workshop.
  • Oct. 5, 2004: Photo collection: Press molds, half cells, cut-away views of Nb-Cu clad cells manufactured by the KEK group. Also, a 9-cell cavity built by the INFN/Padova group.
  • Sep. 30, 2004: Half cells which have been test-fabricated for building L-band cavities (LL-shape design).
Last modified: Wed Mar 13 13:31:20 JST 2013