[Neutron] J-PARC newsletter#24
arai (J-PARC)
masaarai at hotmail.co.jp
Tue May 2 08:32:46 CDT 2006
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J-PARC Project Newsletter
_______ No.24,April 2006_______
High Intensity Proton Accelerator Project proposed jointly
by the Japan Atomic Energy Agency (JAEA) and
the High Energy Accelerator Research Organization (KEK)
http://j-parc.jp/index-e.html
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HEADLINES AND CONTENTS
1. <<Overview>>
.J-PARC CENTER STARTED ITS OPERATION.
.ANNUAL IAC and A-TAC MEETINGS WERE HELD IN FEBRUARY.
.TOP MANAGEMENT CHANGED AT KEK FROM APRIL OF 2006.
.SYMBOL MARK FOR J-PARC WAS SELECTED.
2.<<Accelerator Group>>
.THE RING RF TEAM IS FOCUSING ON FINDING A METHOD OF CUTTING
THE MAGNETIC ALLOY CORES, WHICH CAN STAND LONG-TERM HIGH POWER
LOADING.
3. <<Nuclear and Particle Physics Group>>
.MAGNET INSTALLATION STARTED AT THE SWITCHYARD OF THE
HADRON FACILITY
.FIRST 2 PRODUCTION SC-MAGNETS FOR THE NEUTRINO BEAM HAVE BEEN
COMPLETED AND SUCCESFULLY EXCITED
4. <<Neutron Science Group>>
.PRODUCTION OF SUPER MIRROR GUIDE TUBES HAS BEEN STARTED USING
A LARGE SCALE ION BEAM SPUTTERING SYSTEM.
5. <<Nuclear Transmutation Group>>
.PRELIMINARY LETTERS OF INTENT FOR THE TRANSMUTATION EXPERIMENTAL
FACILITY (TEF) ARE BEING SOLICITED
6. <<Radiation Safety Group>>
.THE FIRST CERTIFICATE OF PERMISSION FOR THE RADIATION FACILITY
WAS ISSUED BY MEXT
7. <<Announcement of Symposia and Meetings>>
8. <<Editorial Note>>
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1. <<Overview>> By Shoji NAGAMIYA
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.J-PARC CENTER STARTED ITS OPERATION.
The start of the J-PARC Center marked another major milestone
for J-PARC. The Center was started officially on February 17, and
the celebration ceremony was held on March 16 by having over 200
important guests from the Government, Local Government, Village,
Universities, Institutions, User Communities, and many other places.
The J-PARC Center was designed as an organization for the
operation of J-PARC. The major difference between the
"construction team" and the "J-PARC Center" is as follows.
The joint construction team between JAEA and KEK was formed
under the explicit agreement between the two institutions such
that each institution takes the entire responsibility for the
facilities that were (or, are) constructed by its budget. For
example, since JAEA constructed the Linac and 3 GeV
accelerator, JAEA is responsible for the Linac and 3 GeV
accelerator, not only for construction but also for
pre-operation and other necessary management issues such
as safety. On the other hand, the J-PARC Center was
established under the agreement that two institutions let one
organization, the J-PARC Center, to take the entire responsibility
for the items that two institutions agreed. For example, since the
two institutions decided to ask the J-PARC Center to manage and
control the safety of the entire J-PARC facilities, this portion of the
task of the J-PARC will move to the J-PARC Center. Eventually,
when the J-PARC constructions completed, it is expected that
tasks of the entire J-PARC operation will be moved to this J-PARC
Center.
For the coming three years it is expected that the J-PARC
Center gradually grows to a size of 330 permanent employees and
280 temporary (outsourcing). In February, the Center started with 62
permanent members. The Director of the J-PARC is myself and
Deputy Directors are Yoshi Yamazaki from KEK and Yukio Oyama
from JAEA. Three Divisions were created to start with: Accelerator
(Leader: Y. Yamazaki), Safety (Leader: M. Takasaki), and Administration
(Leader: M . Murasawa). Six to seven other divisions will be added
within a year or two.
.ANNUAL IAC and A-TAC MEETINGS WERE HELD IN FEBRUARY.
At the end of February the annual meeting of the International
Advisory Committee (IAC) chaired by John White as well as the annual
meeting of the Accelerator Technical Advisory Committee (A-TAC)
chaired by Steve Holmes were held. Many pressing and important
technical issues were discussed at the A-TAC meeting, details of
which will be described elsewhere in this newsletter. The IAC
reaffirms the importance of the timely completion of the project
and celebrated the success of obtaining excellent funding in JFY2006
as well as the start of the official J-PARC Center. However, for details
of the project the IAC pointed to many different technical issues that
must be solved now. The IAC thus recommended creating a position
of Technical Coordinator for the J-PARC project, to oversee practical
details of the project. The IAC also encouraged starting work to obtain
a reasonable amount of operational funds for J-PARC. Note that the
J-PARC operationnwill start in JFY2008.
.TOP MANAGEMENT CHANGED AT KEK FROM APRIL OF 2006.
In association with the change of Director General of KEK
from Yoji Totsuka to Atsuto Suzuki, the members of board of directors
at KEK have been changed significantly. Accordingly, the members of the
Management Council of the J-PARC have also been changed. Major
changes are: M. Kobayashi to F.Takasaki, A.Koma to O.Shimomura,
and K.Kondo to H.Hirayama.
.SYMBOL MARK FOR J-PARC WAS SELECTED.
Out of over one hundred applications, the symbol mark for
the J-PARC was selected. It will be posted at the J-PARC homepage.
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2.<<Accelerator Group>> by Yoshishige YAMAZAKI
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.THE RING RF TEAM IS FOCUSING ON FINDING THE METHOD OF
CUTTING THE MAGNETIC ALLOY CORES, WHICH CAN STAND THE
LONG-TERM HIGH POWER LOADING.
In the Radio-Frequency (RF) Accelerating Systems of both the 3-GeV
Rapid-Cycling Synchrotron (RCS) and the 50-GeV Main Ring (MR)
Synchrotron, cavities loaded with magnetic alloy (MA), some of which
are called FINEMET, will be fully utilized. The advantages of MA cavities
over conventional ferrite-loaded cavities are their high impedance at
high magnetic flux (that is, high accelerating electric field) and their
very low Q values, eliminating any trouble of some frequency tuning
mechanisms. In order to optimize both the Q value and the resonant
frequency of a cavity, we devised a method to cut theMA. Among
various cutting methods, cutting by the use of grindstone tools
looked very promising. However, the cut core with acryl-molding
was seriously damaged after 50 hour high-power test of 60 kW per gap,
which is by 30 per cent higher than design value. In the next test of
those with epoxy molding, a small damage with a diameter of 2 mm
was observed after 120-hour run. Both events looked damaged at the
points where the nitric acid used to etch the cut surface emerged
from inside. Thus, another method is under development to cut
the surface without acid, for example, by use of the diamond cutting.
Since the time limit is coming close for starting the mass production
of the cavities, a task force was formed to reinforce the
development team.
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3.<<Nuclear and Particle Physics Group>> by K.TANAKA, T.KOBOYASHI, T.OGITSU
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.MAGNET INSTALLATION STARTED AT THE SWITCHYARD OF
THE HADRON FACILITY
The 150m-long underground tunnel of the slow extraction beamline
from the 50 GeV synchrotron to the Hadron Experimental Facility,
i.e. the switchyard (SY) was completed, and the installation of the
beamline was immediately started on March 20 by transferring the
first KEK-PS recycledvmagnets from KEK Tsukuba Campus.
A total of 19 magnets were transferred by the end of the month.
Pending the setting of those magnets, the next 17 magnets will be
transported soon. This is the first milestone of the equipment
installation in the Hadron Facility. Because the recycled magnets
are slightly activated, the SY is now under the zone control as
the first radiation area of J-PARC. Just downstream, the hall building
construction is proceeding, with a goal of completion at the end of
this fiscal year.
FIRST 2 PRODUCTION SC-MAGNETS FOR THE NEUTRINO BEAM HAVE BEEN
COMPLETED AND SUCCESFULLY EXCITED
In the neutrino facility, 28 superconducting combined function magnets
are employed to bend the primary proton beam and transport it to the
production target. In FY2005, the major milestone of starting mass
production has been cleared. So far, two production magnets have
been fabricated smoothly. Both of them have been successfully
cooled down and excited; the nominal current of 50GeV operation
was exceeded by 5% without quenching. In order to minimize costs
and risks, the LHC magnet design was adopted for the cryostat as
much as possible. The vacuum vessels were fabricated in Europe
(by a Spanish company) and all of them have been delivered to KEK.
The first full unit (~10m long, 1m diameter, ~20 tons) with 2 magnets
in a cryostat has also been successfully assembled and delivered to KEK.
For more information, see
http://cry3-aps.kek.jp/~cryoweb/menu/menu2/R&D/jparc/jparc.html
(Japanese)
http://cry3-aps.kek.jp/~cryoweb/menue/menu2/R&D/jparc/jparce.html
(English)
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4. <<Neutron Science Group>> by Yujiro IKEDA
(Materials & Life Science Experimental Facility Group)
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.PRODUCTION OF SUPER MIRROR GUIDE TUBES HAS BEEN
STARTED USING A LARGE SCALE ION BEAM SPUTTERING SYSTEM
A mockup model of the coupled moderator was fabricated and
tested at cryogenic temperature. Seal performance tests for the
connection flanges between the mercury target and the circulation
system gave a good seal performance of 10-8 Pa m3/s. Fabrication
of two cryogenic circulation pumps was also completed. In the MLF
building, 130t, 65t, 50t, and 30t cranes became operational to install
heavy shielding blocks around the helium vessel. Up to now, about
90% of the shielding blocks were installed. Construction of the MLF
accessory buildings including a secondary cooling system pump
building, No.1 and No.2 helium compressor buildings and an H2 and
He cylinders storage yard were completed. The proton beam
transport tunnel has been completed and connected to the
3-GeV Synchrotron tunnel and the Materials and Life Science
Facility building. A cooling water system and a personnel protection
system are now being installed. To monitor and adjust the neutron
guide system against sinking of the MLF ground level, we decided
to adopt an entubed liquid surface monitoring system, which can
give enough accuracy for re-alignment.
Two types of detector systems were identified to be developed: a
wave-shift fibre system to be installed in the Ibaraki bio-crystal
diffractometer(BIX-P1) and the ISIS-type ZnS scintillation detector
system to be installed in the Residual Stress Analysis Diffractometer
(RAD). Along with those an Anger Camera is to be developed by
RIKEN for other purposes. We held a series of workshops on SANS,
the total scattering instruments and reflectometer. Extension of
the MLF building is under discussion for installing RAD and the high
resolution powder diffractometer. Geometrical conflict between
BL3 (BIX-P1) and BL4 (nuclear engineering instrument) is under
discussion. Reconsideration of the scenario for the radiation
safety level for instruments is underway, which will save
a lot of over-shielding yet keeping satisfactory safety.
Production of supermirror guide tubes has been started using a
large scale ion beam sputtering system. Improvement of neutron
reflectivity has been achieved using this system, and a 3Qc
supermirror with a reflectivity of 90% has been developed.
Prototype systems of data-acquisition for J-PARC were
successfully operated at KENS for 6-month user-programs. The
server-client type DAQ system, both of "histogram" and "event"
modes, will be integrated with data-analysis components. Software
development for each day-1 instrument will be started in FY2006.
The Neutron Group Board (KEK-JAEA neutron working group) which
is formulated under the MLFG leader has been working on showing the
'impact of neutrons on both science and industry' to get financial
support from the Government. It has also been discussing the
organization of the neutron and muon groups after the neutron
beam will be operational. The beam line working group (BLWG) is
also organized under the J-PARC steering committee to discuss
the treatment of instruments being developed by organizations
outside the project team, especially two Ibaraki prefecture
instruments. The hot issue is the charging scheme for their
proprietary use.
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5. <<Nuclear Transmutation Group>> by Hiroyuki OIGAWA
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.PRELIMINARY LETTERS OF INTENT FOR THE TRANSMUTATION
EXPERIMENTAL FACILITY (TEF) ARE BEING SOLICITED
The Project Team is now calling for "Preliminary Letters of Intent
(Pre-LOIs)" for experiments at the Transmutation Experimental Facility
(TEF). Although the TEF program has not yet been officially approved
by the government, the Pre-LOIs from all over the world are needed
to facilitate the initiation of the program from the following viewpoints:
1) To know which groups have an interest in this activity and what
contributions from the collaboration can be expected.
2) To reflect the proposals on the specifications and layout of the
facility.
3) To establish an appropriate collaboration scheme between J-PARC
and the anticipated outside users.
Please obtain detailed information from the web site:
http://j-parc.jp/index-e.html ,
by clicking "call for the preliminary Letters of Intent" in the column
of "News & Topics".
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6.<<Radiation Safety Group>> by Hideo HIRAYAMA and Hiroshi NAKASHIMA
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.THE FIRST CERTIFICATE OF PERMISSION FOR THE RADIATION
FACILITY WAS ISSUED BY MEXT
The application for the license of the radiation facilities of the Linac
and the Switchyard in the Hadron Facility was submitted to the Ministry
of Education, Culture, Sports, Science and Technology (MEXT) on 31
August, 2005. Since that time, the radiation-safety aspects of these
facilities had been examined. The certificate of permission for the
LINAC and the Switchyard was finally issued to the Director of J-PARC
Center on March 7. Before using these facilities as a radiation facility,
an inspection by the Nuclear Safety Technology Center(NUSTEC) was
compulsory: the first inspection was conducted on March 13 for the
Switchyard to check items written in the application (shielding, fence,
radiation markings). The certificate of inspection was issued on March
14, and the radiation controlled area of the Switchyard was setup on
March 20. Activated magnets were scheduled to be delivered to the
controlled area from KEK on March 20 just after the setup of the
radiation controlled area. Before the setup of the radiation controlled
area, the certificates from the Tokai-mura municipal government and
the Ibaraki prefecture government were issued under the Ibaraki
prefecture nuclear safety agreement; a supervisor of radiation
protection of J-PARC and the regulations on protection from
radiation hazards were reported to MEXT.
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7. <<Announcement of Symposia and Meetings>>
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8. <<Editorial Note>>
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Editorial Board:
Masatoshi ARAI (chair): masatoshi.arai at j-parc.jp
Koji YOSHIMURA: koji.yoshimura at kek.jp
Yujiro IKEDA: yujiro.ikeda at jaea.go.jp
Nobuo OUCHI: nobuo.ouchi at jaea.go.jp
Shinya SAWADA: shinya.sawada at kek.jp
English Editor: Dick Mischke mischke at triumf.ca
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