Japan is constructing a 50 Gev, high intensity
proton accelerator at a site near the Japanese high energy research
laboratory, KEK. The project is called J-PARC (Japan Proton Accelerator
Research Complex). The site is at Tokai and is part of the Japanese
Atomic Energy Research Institute (JAERI). KEK and JAERI are jointly
responsible for its construction. Further information is available at
http://jkj.tokai.jaeri.go.jp/
J-PARC will serve many uses. One of the uses will
be to produce neutrinos that will be directed toward a detector located
in Kamiokande, Japan. The neutrinos will be produced when protons are
extracted from J-PARC and are directed by magnets in a beam line to
strike a target. Further information about the neutrino experiment is
available at
http://neutrino.kek.jp/jhfnu/
KEK and the BNL Superconducting Magnet Division are
working together to produce the superconducting magnets for the proton
beam line. KEK is producing the principal magnets, which will have a
novel “combined function” coil that will bend and focus the proton beam
at the same time. One area of cooperation between KEK and BNL is to
jointly review some of the detailed features of the design, since some
of the concepts used in the design were established during the
construction of the magnets for RHIC.
The other area of cooperation is to construct
superconducting correction coils for the beam line. Dipole correction
coils are definitely needed. It may also be desirable to have
quadrupole correction available. If so, this correction would be
provided in the form of combined function correctors. All correctors
will be constructed at BNL using coil design software integrated with a
precise, automatic winding machine. This CAD/CAM facility is now being
used to make new insertion region (IR) magnets for the electron-positron
collider BEPC II in Beijing, China (SMD BEPC work). In the
past, the machine made IR magnets for an upgrade of the HERA IR regions
at DESY in Hamburg, Germany (SMD HERA work).
The work at BNL is being funded by the U.S. –
Japan Collaboration. During JFY03 (April 1, 2003 – March 31, 2004), BNL
is building prototype dipole and combined function correctors in a beam
tube supplied by KEK (figure 1). These correctors will be installed and
tested in the prototype main coil that is being built at KEK.
Figure
1
Winding the prototype coil (video)
(4.6 MB file)
For more information contact Peter
Wanderer
