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The J-PARC accelerator complex consists of 3 accelerators, a linear accelerator, a rapid cycle synchrotron (RCS, 3GeV) and a 50 GeV (Max) synchrotron. Each accelerator provides the experimental faculties (materials and life science, hadron physics, neutrinos, transmutation) with a high intensity beam. The secondary particles, such as neutrons, mesons as well as neutrinos from these mesons, are produced by bombarding a target with an intense proton beam. |
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 Topics
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 Confirmation of neutral kaons in the KL beam line at Hadron Hall, J-PARC(Dec. 7,2009)
TOKAI-MURA, IBARAKI - The collaboration of Experiment E14, led by Professor Taku Yamanaka of Osaka University and abbreviated as KOTO, has successfully confirmed neutral kaons in the KL beam line at the Hadron Hall of J-PARC.
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T2K Neutrino Beamline Started Operation (Apr. 24, 2009)
At 19:09(JST) on April 23, the Tokai to Kamioka (T2K) long baseline neutrino oscillation experiment confirmed the first neutrino beam production by observing the muons produced by the proton beam in the neutrino facility at Japan Proton Accelerator Complex (J-PARC). |
The Seventh J-PARC Program Advisory Committee was held (Mar. 16, 2009)
On March 6-7, the 7th J-PARC Program Advisory Committee (PAC) was held at KEK Tsukuba Campus, having 15 members including 5 from abroad. |
Successful transportation of protons was featured in CERN COURIER (Feb. 23, 2009)
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Protons are successfully accelerated and transported to J-PARC Hadron Experimental
Hall (Jan. 28, 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.
JAEA News release
KEK Press Release
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Successful acceleration up to 30 GeV
of proton beam and extraction at J-PARC MR (Dec. 23, 2008)
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The J-PARC T2K Neutrino Experiment was featured in CERN COURIER. (Jul 8, 2008)
| Construction is well under way in Japan on the new facility to send neutrinos from J-PARC to the Super-Kamiokande detector nearly 300 km away. --> more |
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MR: License was issued for 3-GeV operation (Jul 1, 2008)
On the basis of the radiation survey of 50-GeV synchrotron (MR) for 3-GeV operation performed on June 19th, the certificate was officially issued on July 1st.
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J-PARC Project Newsletter Accelerator Hilight
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ACCELERATOR KEEPS AVAILABILITY HIGHER THAN 92 % IN USER OPERATIONS FOR NEUTRON, MUON AND NEUTRINO.---more
(J-PARC Project Newsletter No.41, Aug.4, 2010) 
AVAILABILITY EXCEEDS 92 % IN 120 KW OPERATION FOR THE
COMMON USE OF MLF (MATERIAL AND LIFE SCIENCE FACILITY).---more
(J-PARC Project Newsletter No.40, June.8, 2010)
THE FIRST T2K NEUTRINO EVENT OBSERVED AT SUPER-KAMIOKANDE
---more
(J-PARC Project Newsletter -Special Issue-, Mar. 5, 2010)
SUCCESS IN 300 kW TEST OPERATION OF RCS (3-GeV Rapid Cycling Synchrotron) ---more
(J-PARC Project Newsletter No.39, Mar. 1, 2010)
Beam commisioning restarted with steady improvement of
RFQ (Radio-Frequency Quadrupole) LINAC---more
(J-PARC Project Newsletter No.38, Nov. 13, 2009)
Success of Extraction to Neutrino Target from MR---more
(J-PARC Project Newsletter No.37, July 23, 2009) Extraction of 30 GeV proton beam to hadron beam dump---more
(J-PARC Project Newsletter No.36, May 7, 2009)
Success of 30GeV acceleration and extraction in MR
---more
(J-PARC Project Newsletter No.35, Feb. 4, 2009) |
BEAM COMMISSIONING OF MR AND MLF WAS STARTED (J-PARC Project Newsletter No.33, July 2008) -2008.8.4-
An effort to extract the beam from the 3 GeV ring to the 50 GeV ring started during the week of May 19th. On the 20th, a circulation of the beam in the 50 GeV ring was successfully achieved. Later, on May 22nd, the beam was captured by the RF and, then, extracted outside the ring. During the test period in May and June, the beam energy remained as 3 GeV (no accelerations). This was a "planned" action. The acceleration of the beam to 30 GeV is scheduled in December of this year. The entire team was satisfied by the test results that have been obtained in May and June, since we were able to confirm that many different elements from upstream to downstream of the accelerator system worked very successfully, though they are extremely complex.
Birth of Pulsed Neutrons in J-PARC (J-PARC Newsletter Special Issue(Birth of neutrons)-2008/5/30-)
On May 30th, 2008. At 14:25, a shot of 3GeV protons from RCS (3 GeV synchrotron) was injected to the mercury target at MLF.
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MR: Successful injection of 3GeV proton beam, RF captured and extraction
At 22:27 of May 22nd 2008, the 3 GeV proton beams from the RCS (3GeV proton synchrotron) were successfully injected into the Main Ring (50GeV proton synchrotron). The beam was captured by RF and extracted to the beam dump after 1000 turns. The day after, the beam storage time was extended up to 1 second. It is the major milestone for the J-PARC. The next step is to accelerate beams to 30GeV (Phase I) and to extract beams to the experimental holes, which will start in the end of this year. (by nh 2008.5.27) |
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Monthly Reports (by photos)
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