Particle accelerators are the basis of all research activities carried at High Energy Accelerator Research Organization (KEK). KEK would even lose the reason for its existence, if it did not have particle accelerators. The Accelerator Laboratory (ACCL) operates all accelerators at KEK, and develops the performance of the beam, which provides the basis of all corporative experiments on elementary particles, nuclear, material, and life sciences, etc., for researchers in Japan and the world. It is also endeavoring to research, design, and develop (RD&D) future accelerators and related technologies.
At Tsukuba Campus, ACCL operates KEKB B-Factory (electron-positron colliding rings with an injector linac), which gave experimental verification to Kobayashi-Maskawa theory to win 2008 Nobel Prize in Physics. It also operates two rings at Photon Factory (PF and PF-AR), which is a pioneer of synchrotron light sources in the world. It also performs RD&D for an Energy Recovery Linac (ERL) as a future light source. Developments for the International Linear Collider (ILC) has been done at experimental accelerators ATF and STF.
At Tokai Campus, ACCL has already started the operation of J-PARC for user’s experiments together with JAEA, and is paying a lot of efforts for improvement of beam performance with conquering various issues accompanied by a high intensity proton beam.
ACCL has carried out collaboration research with various accelerator laboratories and researchers in the world, including the United States (Fermilab, SLAC, Cornell Univ., JLab, etc.), Asia (IHEP-Beijing, Shanghai, Pohan, Taiwan, BINP, RRCAT etc.), Europe (CERN, DESY, INFN, etc.).Using Crab Cavities, KEKB Breaks Luminosity World Record ( Current operation summary) (2009年5月7日)
Peak Luminosity 1.9644 x 1034 cm-2 s-1 (2009年5月6日 8:33)
Daily Integrated Luminosity 1.334 /fb (2009年5月6日)
dotProton beam reaches neutrino target at J-PARC (2009年4月23日)
At 19:09 on April 23, J-PARC has reached a new milestone with successful extraction of proton beam to a neutrino target.
The proton beam accelerated to 30 GeV in the J-PARC Main Ring was extracted and transported through the beam line which has 14 superconducting dipoles and then hit on the neutrino target.
This achievement denotes the start of challenge to send high-power neutrino beams to the Super-Kamiokande detector which locates 295 km west from the J-PARC cite for long baseline neutrino oscillation experiment.(J-PARC)
dotProtons are successfully accelerated and transported to J-PARC Hadron Experimental Hall
A new milestone was set by the 50 GeV Synchrotron, which is the 3rd and the last stage of the accelerators of the Japan Proton Accelerator Research Complex (J-PARC), on January 27, 2009. Protons were accelerated up to 30 billion electron-volts (30 GeV), then successfully extracted to Hadron Experimental Hall in Nuclear and Particle Physics Facility and transported to the beam dump. (2009年1月28日)
dotATF2 for R&D of nano-meter electron beam has been started(2009年1月9日)
A new beamline for R&D toward nano-meter electron beam has started operation at KEK's Accelerator Test Facility - ATF.
dotNambu, Kobayashi and Maskawa win the 2008 Nobel Prize for Physics.(2008年10月7日)
Kobayashi and Maskawa are awarded for the discovery of the origin of the broken symmetry which predicts the existence of at least three families of quarks in nature.
The Accelerator that Proved the Nobelists' Theory: KEKB
The Nobel Prize in Physics 2008
Extraction of 30 GEV proton beam to hadron beam dump
dotJ-PARC Project Newsletter #35 Feb. 4, 2009
Success of 30GeV acceleration and extraction in MR---more
dotThe J-PARC 3-GeV RCS achieved a beam power of 210 kW for a period of 70 seconds at 25Hz, and 315kW-equivalent power in one-pulse operation. ...more
(19 September 2008 ) J-PARC Project Newsletter Special issue
2008年5月22日
Using Crab Cavities, KEKB Breaks Luminosity World Record ( Current operation summary)
Peak Luminosity 1.9644 x 1034 cm-2 s-1 (2009年5月6日 8:33)
Daily Integrated Luminosity 1.334 /fb (2009年5月6日)
International collaboration at KEKB
■Global Collaboration Between KEKB and LHC on Crab Cavities(2008年10月3日)
■CesrTA project at Cornell University(2008年9月29日)
Agenda of the 13th KEKB Accelerator Review Committee-11/29 - 12/5, 2007-
Global Collaboration Between KEKB and LHC
on Crab Cavities
Electron clearing electrode R&D
[CesrTA project]
Electoron-Positron Injector Linac (LINAC)
Accelerator Test Facility (ATF)
Proton Synchrotron (12-GeV PS)
Japan Proton Accelerator Research Complex (J-PARC)
ESRING (in Japanese)
Super-bunch (in Japanese)
Table-Top Proton Synchrotron (TTPS)
Low-impedance cavity collaboration
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