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J-PARC Project Newsletter
Special Issue
Japan Proton Accelerator Research Complex under construction
jointly by the High Energy Accelerator Research Organization (KEK) and
the Japan Atomic Energy Agency (JAEA)
http://j-parc.jp/index-e.html
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You can find below the press release on the successful extraction and
transportation of the 30-GeV proton beam to the Hadron Experimental Hall.
Protons are successfully accelerated and transported to J-PARC Hadron
Experimental Hall
January 28, 2009
J-PARC Center
TOKAI-MURA, IBARAKI - 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.
Since 2001, J-PARC has been jointly built by Japan Atomic Energy Agency
(JAEA) and High Energy Accelerator Research Organization (KEK) at Tokai
village in Ibaraki prefecture, Japan. The accelerator complex consisted of
three stage, the LINAC, 3 GeV Synchrotron and 50 GeV Synchrotron, or the
Main Ring.
"We are extremely delighted," says the J-PARC director Shoji Nagamiya.
"After more than a decade of continuous efforts of designing and
construction, we are coming to the final stage of the construction. The Main
Ring, 1600 meters in circumference and 500 meters in diameter, is the last
stage of the proton accelerator complex. In last December, we have reached
to the beam energy of 30 GeV, at which we will operate in the first phase of
the project. Proton beams are extracted and successfully injected to Hadron
Experimental Hall."
The Hadron Experimental Hall is one of the two facilities at the Main Ring
and utilizes the various kinds of secondary particles generated by protons.
"We will have the most powerful secondary particle beams of this energy,"
says Professor Kazuhiro Tanaka, who led the construction of the Hall. "We
will explore the new frontier in nuclear and particle physics with high
intensity hadron beams. Precise measurements of CP violation in K mesons,
collective motions of strange quark in hyper nuclei, and many other
new-generation fixed target experiemnts are being planned."
To make plenty of secondary particles by the high intensity proton beam
available for experiments, many methods of handling the high intensity beam
have been developed for this facility. In particular, firm radiation shield
was constructed and the magnets that were hard to be broken and easy to be
replaced, in case in trouble in the high radiation area, were produced.
The test of proton beam acceleration started in November 2006. Protons were
successfully accelerated to the designed energy of the LINAC (the 1st
accelerator of J-PARC) in January 2007, to the designed energy of the 3 GeV
Synchrotron (the 2nd accelerator) in October 2007, and to the initial goal
of 30 GeV in December 2008. This time, the protons were successfully
extracted from the Main Ring to the secondary-particle production target
(T1) in the Hadron Experimental Hall, located at 250 meters downstream. The
beam was then successfully transported to the beam dump.
"J-PARC is the multi-purpose research complex that will contribute greatly
to the advanced researches of science and technology in this century in
Japan and worldwide," said Director Nagamiya. "Neutron and muon beams are
already available in the Material and Life Science Facility. With the
success of the Hadron Experimental Hall, our next goal is to send high power
neutrino beams into Super-Kamiokande, a large underground neutrino detector
which is 295 km away. I'm sure J-PARC will contribute towards developing not
only the basic sciences such as hadron and neutrino physics, chemistry and
biology but also the wide applications in life science, engineering,
information science, electronics and medicine."
[ Media Contact ]
About the J-PARC project:
Yukio Oyama,
Deputy Director of J-PARC
tel. +81-29-282-6809
About technical contents:
Kazuhiro Tanaka,
Particle and Nuclear Physics Division, J-PARC
tel. +81-29-284-4050
About JAEA:
Shinichi Nishikawa,
Head of Public Relations, JAEA
tel. +81-29-282-9421 About KEK:
Youhei Morita,
Head of Public Relations Office, KEK
tel. +81-29-879-6047
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[Editorial Note]
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Editorial Board:
Masatoshi ARAI (chair): masatoshi.arai@j-parc.jp
Yujiro IKEDA: ikeda.yujiro@jaea.go.jp
Nobuo OUCHI: ouchi.nobuo@jaea.go.jp
Shinya SAWADA: shinya.sawada@kek.jp
Toshifumi TSUKAMOTO: toshifumi.tsukamoto@kek.jp
English Editor: Dick MISCHKE mischke@triumf.ca
Secretary: Chikako KAIBARA kaibara.chikako@jaea.go.jp
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