[Neutron] J-PARC Newsletter #17
Masatoshi ARAI
masatoshi.arai at kek.jp
Fri Jul 30 19:41:16 CDT 2004
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J-PARC Project Newsletter
_______ No. 17 July, 2004 _______
High Intensity Proton Accelerator Project proposed jointly
by the Japan Atomic Energy Research Institute (JAERI)
and the High Energy Accelerator Research Organization (KEK)
http://j-parc.jp/
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HEADLINES AND CONTENTS
1. <<Overview>>
.DISCUSSIONS ON THE ORGANIZATIONAL STRUCTURE IN PROGRESS.
.NEW USERS CONSULTATIVE COMMITTEE STARTED.
.IBARAKI PREFECTURE DONATES TWO NEUTRON BEAM LINES.
2. <<Accelerator Group>>
.PRODUCTION OF THE CERAMICS CHAMBER FOR THE 3-GEV RAPID CYCLING
SYNCHROTRON IS IN PROGRESS.
3. <<Exotic Nuclear Science Group>>
.INSTALLATION OF THE KEK-LINACS WAS FINISHED.
.R&D FOR THE HIGH-ENERGY RNB IS STARTED.
.THE FIRST TRIAC WORK SHOP WILL BE HELD AT TOKAI-SITE, JAERI,
21-23, SEPTEMBER.
4. <<Nuclear and Particle Physics Group>>
.DEVELOPMENT AND TESTING OF HADRON HALL PRIMARY LINE ELEMENTS
ARE GOING ON AT KEK.
5. <<Neutron Science Group>>
.A REFERENCE MASTER SCHEDULE OF THE MLF CONSTRUCTION HAS BEEN SET
UP TAKING ACCOUNT OF BOTH THE BUILDING CONSTRUCTION AND THE
MACHINE INSTALLATION AFTER DETAILED DISCUSSION AMONG THE
MULTIPLE VENDERS.
.A NEW COORDINATION BOARD, NEUTRON GROUP BOARD, WAS FORMED UNDER
THE MLFG LEADER TO MAKE DECISIONS ON IMPORTANT ISSUES CONCERNING
NEUTRON USE.
6. <<Muon Science Group>>
.NIHON-CYUUZO CORPORATION OBTAINED AN INTERNATIONAL BID FOR 1000
TONS OF IRON SLABS.
7. <<Nuclear Transmutation Group>>
.JAERI'S LEAD-BISMUTH LOOP NO.3 (JLBL-3) WAS INSTALLED TO STUDY
THERMAL-HYDRAULIC CHARACTERISTICS OF THE BEAM WINDOW FOR THE
ACCELERATOR-DRIVEN SUBCRITICAL SYSTEM (ADS).
.COLLABORATION FOR ADS AMONG JAPAN, KOREA AND CHINA WAS DISCUSSED
IN THE 2ND ASIA ADS WORKSHOP.
8. <<Facility Construction Group>>
.ACCELERATOR TUNNEL OF THE LINAC BUILDING HAS BEEN COMPLETED.
.TUNNEL OF THE FIRST QUARTER PART OF THE 50 GEV SYNCHROTRON
BUILDING HAS BEEN COMPLETED.
9. <<Announcement of Symposia and Meetings>>
10. <<Editorial Note>>
.Subscribe or Unsubscribe
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1. <<Overview>> By Shoji NAGAMIYA
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.DISCUSSIONS ON THE ORGANIZATIONAL STRUCTURE IN PROGRESS.
For the past three years a significant amount of time
was spent in discussions on the organizational structure of the
J-PARC at the operational stage. These discussions were held at KEK,
at JAERI and at the project team. Recently, several ideas seem to
start to merge into one scheme. A new committee was formed (chair:
Dr. T. Matsushita at KEK) to create one proposal that is acceptable
to both KEK and JAERI. The committee has formed several working
groups. The present goal is to create one proposal by the end of
August. Active discussions are currently in progress.
.NEW USERS CONSULTATIVE COMMITTEE STARTED.
Because the time of operation of the J-PARC is approaching
within the foreseeable future (within 3-4 years), it is a good time
to create a mechanism to reflect voices from the user communities
much more efficiently than before. Recently, a new "User
Consultative Committee" has been created and has started its
activities. Members were first elected by four user communities:
high-energy physics (3 members), nuclear physics (3), neutron (4),
and muon (2). In addition, two members are invited from the Science
Council of Japan. Then, additional members were appointed to cover
nuclear transmutation (2) and industrial usage (3). At the first
meeting held in July, the chair of this committee was elected to be
Professor O. Hashimoto from Tohoku University.
Discussion items for this committee include: 1) J-PARC
organizational structure, 2) mechanism of preparation of experimental
equipment, 3) role of users and role of J-PARC institutions at the
operational stage, etc. Every three months this committee meets to
discuss advice to the project.
.IBARAKI PREFECTURE DONATES TWO NEUTRON BEAM LINES.
An official action was taken from the Ibaraki Prefecture
(Local Government) to donate two neutron beam lines (plus some
additional expenses) to J-PARC. These beam lines will be used
primarily for the industrial applications of the J-PARC neutron
scattering, although basic research can also be anticipated at these
beam lines.
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2. <<Accelerator Group>> by Yoshisige YAMAZAKI
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.PRODUCTION OF THE CERAMICS CHAMBER FOR THE 3-GEV RAPID
CYCLING SYNCHROTRON IS IN PROGRESS.
Among the J-PARC accelerator complex, the rapid-cycling
synchrotron (RCS) includes difficult R&D items to be developed.
First, the high-field gradient RF cavity system is vital for the
rapid acceleration. Second, the magnets are of wide aperture, and
should be immune against eddy current effects. Third, the vacuum
chamber should be made of an insulator, typically aluminum ceramics
which should be equipped with metallic strips. The status of the RF
system has been reported several times in previous Newsletters. The
first RCS Q magnet will come to JAERI at the end of July. In the
next Newsletter, the result of the field measurement of the magnet
will be reported in detail. This time, the progress in the ceramics
chamber will be highlighted. Although very high mechanical accuracy
is required for sintering ceramics chambers, the technology necessary
for this was mastered completely. The sintering of the ceramics
chambers for the bending magnets and one family of the quadrupole
magnets is 70% complete. The next major issue is the polishing of
the ceramics chamber. This summer the first mass-produced chamber
will be installed in the KEK-PS to test its performance under the
beam loading environment.
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3. <<Exotic Nuclear Science Group>> by Hiroari MIYATAKE
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.INSTALLATION OF THE KEK-LINACS WAS FINISHED.
The installation of KEK-linacs (SCRFQ- and IH- linacs) as
well as the charge breeding ECRIS (Electron Cyclotron Resonance Ion
Source), the beam line from JAERI-ISOL, and their relevant equipment
has been in progress since FY2001 and was finished this April. We
are now in the midst of conditioning and tuning these devices for the
TRIAC (Tokai Radioactive Ion Accelerator Complex) facility. The first
RNB (Radioactive Nuclear Beam) will come to the target position at
the end of this year.
.R&D FOR THE HIGH-ENERGY RNB IS STARTED.
RNB with higher energy than 5 MeV/u will be available by
connecting IH-linac to the JAERI super conducting (SC-) linac after
some modifications as follows: (1) The original 8 single
quarter-wave-resonators (QWRs) of the SC-linac, whose optimized
input velocity is beta=0.1, will be replaced by the newly designed
low-beta 8 twin-QWRs (beta=0.06). (2) The 4 of 8 old QWRs will be
reused as additional QWRs at the end of the SC-linac. Hence the
final structure of the modified SC-linac will be low-beta 8 twin-QWRs
and original 36 single-QWRs. The expected output energy covers from
5.25 MeV/u (for A/q=7) to 8.52 MeV/u (for A/q=4), which is high
enough to exceed the fusion barriers of nuclear reactions under any
combination of targets and beams. The cavity test of the low-beta
QWR has been started since this year.
.THE FIRST TRIAC WORKSHOP WILL BE HELD AT TOKAI-SITE, JAERI,
21-23, SEPTEMBER.
This workshop aims at intense discussion on the physics
and the feasibility of each proposed experimental idea using not
only the low-energy RNB ( < 1.1 MeV/u) but also the higher energy
RNB ( > 5 MeV/u). In case you have any proposals, you are cordially
invited to the meeting. The e-mail address for further information is
mitsuoka at popsvr.tokai.jaeri.go.jp.
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4. <<Nuclear and Particle Physics Group>> by Jun IMAZATO
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.DEVELOPMENT AND TESTING OF HADRON HALL PRIMARY LINE ELEMENTS
ARE GOING ON AT KEK.
The most difficult part of the hadron experimental facility
with high beam power to design is the primary beamline, in particular
the circumference of the production target and its direct downstream
equipment. All the beamline elements are made radiation-hard and
heat-resistant and a maintenance scenario has to be finalized already
at the design stage.
In order to facilitate the system design and installation
schemes, the beamline mockup in the KEK East Hall is now playing a
remarkable role. Following the target prototype testing last year,
its near downstream equipment is currently being developed there.
The feeding of power cable, cooling water etc. to magnets is done
through a "chimney" attached above the magnet. These along with a
collimator system have to be hermetic against outgoing radiation.
Thus, they are all coupled to unified shielding blocks, and installed
and removed always together with them. Moreover, those units are put
in a large vacuum vessel to avoid beam pipes downstream the target.
Recently a prototype of such a collimator+shielding test unit which
is vacuum-fit has been made and its installation procedure by crane
and alignment were actually investigated at the site. A test of full
power magnet operation using the feed-through system will be
performed soon.
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5. <<Neutron Science Group>> by Yujiro IKEDA
(Materials & Life Science Experimental Facility Group)
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.A REFERENCE MASTER SCHEDULE OF THE MLF CONSTRUCTION HAS BEEN
SET UP TAKING ACCOUNT OF BOTH THE BUILDING CONSTRUCTION AND
THE MACHINE INSTALLATION AFTER DETAILED DISCUSSION AMONG THE
MULTIPLE VENDERS.
.A NEW COORDINATION BOARD, NEUTRON GROUP BOARD, WAS FORMED
UNDER THE MLFG LEADER TO MAKE DECISIONS ON IMPORTANT ISSUES
CONCERNING NEUTRON USE.
The piling has been finished and the building construction
has started by placing a pressure-resistance slab at the basement
level. Realizing that it is time to fix all process component
routing, and to draw up the composition on the working drawings
precisely, the team is dedicated to gather all the system components
and to check their consistency one by one. This work will continue
to the coming September. Knowing the present time is the last
opportunity to revise designs, which can not be modified afterward,
investigations are underway to determine whether there are any missing
parts in the design through tasks of the system commissioning
procedure development and the facility maintenance program. Taking
important information from those studies, we have set up a reference
construction schedule, Master Schedule, which has resulted from
extensive interaction with the building construction procedure.
The AIC (AgInCd alloy) de-coupler development for the
decoupled moderator has progressed significantly in terms of
identifying a good HIP(Hot Isostatic Pressing) condition between and
AIC and Al alloy. The result has encouraged us to confirm the
moderator present design as being suitable.
To overcome difficulty in getting smooth financial support
from the Government, a Neutron Group Board was formulated under the
MLFG leader. The board is co-chaired by Profs. Y. Fujii (JAERI) and
S. Ikeda (KEK) to make decisions on important issues concerning the
neutron use and instrumentations. The first hot issue is the
treatment of the two instruments to be financed by Ibaraki prefecture.
As these two are identical to the ones proposed by the project team,
how to implement the new instruments is under discussion.
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6. <<Muon Science Group>> by Yasuhiro MIYAKE
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.NIHON-CYUUZO CORPORATION OBTAINED AN INTERNATIONAL BID FOR
1000 TONS OF IRON SLABS.
According to the construction schedule of the Materials and
Life Science Facility (MLF) building, a thousand tons of iron slab
shielding have to be imbedded into the building structure this coming
October, 2004. A detailed calculation of radiation and duct-streaming
in the vicinity of the muon target was carefully done using the MCNPX
computer code. The shield structure and quantity of iron were
optimized in order to keep the cost for the shield as low as possible.
Unfortunately, recently the price of iron slabs has increased
significantly and we had difficulty in meeting our budget. However,
finally, NIHON-CYUUZO corporation obtained an international bid for
the 1000 tons of iron slabs that was acceptable.
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7. <<Nuclear Transmutation Group>> by Hiroyuki OIGAWA
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.JAERI'S LEAD-BISMUTH LOOP NO.3 (JLBL-3) WAS INSTALLED TO
STUDY THERMAL-HYDRAULIC CHARACTERISTICS OF THE BEAM WINDOW
FOR ACCELERATOR-DRIVEN SUBCRITICAL SYSTEM (ADS).
.COLLABORATION FOR ADS AMONG JAPAN, KOREA AND CHINA WAS
DISCUSSED IN THE 2ND ASIA ADS WORKSHOP.
As the R&D for the Accelerator-Driven Subcritical System
(ADS), the lead-bismuth loop No.3 (JLBL-3) was installed in JAERI to
study the thermal-hydraulic characteristics of the beam window at the
spallation target. The maximum flow rate and the maximum temperature
of the lead-bismuth are 500 liter/min. and 450 degree-C, respectively.
It has a beam window simulator of semispherical shape
(diameter = 89mm) containing a heater of 6 kW, and the temperature
distribution of it will be measured to determine heat transfer
between the beam window and the lead-bismuth.
The 2nd Asia ADS Workshop was held on May 20, 2004, at the
Korea Atomic Energy Research Institute (KAERI) in Daejeon, Korea.
Current R&D activities in Japan, Korea and China were presented and
the prospect of collaborative work was discussed. Five areas of
collaboration were nominated: (1) Accelerators, (2) Lead-bismuth and
Related Materials, (3) Fission Products Irradiation, (4) Nuclear Data,
and (5) Reactor Physics and Design of ADS Including New Experimental
Facilities. It is agreed to continue the discussion on collaborations
in these areas.
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8. <<Facility Construction Group>>
by Hideo NARUSE and Tsuruhiro MATSUNAGA
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.ACCELERATOR TUNNEL OF THE LINAC BUILDING HAS BEEN COMPLETED.
Construction of the Linac tunnel has been completed and the
construction of the steel skeleton building above ground progresses.
Construction of the Linac Building will be completed this autumn.
Construction of the 3GeV Synchrotron tunnel is ongoing. As for the
new high-voltage of 153 kV electricity receiving/transforming
substation, the final integrated tests have been completed and the
system is ready for operation, which will start in December. Piling
for the Material and Life Science Facility Building has been
completed and the construction of the building frame will start.
.TUNNEL OF THE FIRST QUARTER PART OF THE 50 GEV SYNCHROTRON
BUILDING HAS BEEN COMPLETED.
Construction of the first quarter part of the 50 GeV
Synchrotron tunnel has been completed. As for the second quarter
part, backfilling of the tunnel has been completed in the north part,
construction of building frame of the tunnel in the south part and
piling in the site, where the construction has been delayed due to the
archeological excavation, are going on. In the third quarter part,
the tunnel of the east part has been completed and the excavation work
is going on in the west part. The construction order of the tunnel
for the final quarter part will be performed in this fiscal year.
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9. Announcement of Symposia and Meetings
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1) THE FIRST TRIAC WORKSHOP WILL BE HELD AT TOKAI-SITE, JAERI,
21-23, SEPTEMBER.
Contact; mitsuoka at popsvr.tokai.jaeri.go.jp.
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10. Editorial Note
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Information on the project can be also obtained at the Web site:
http://j-parc.jp/
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Editorial Board:
Masatoshi ARAI (chair): masatoshi.arai at kek.jp
Koji YOSHIMURA koji.yoshimura at kek.jp
Yujiro IKEDA: ikeda at cens.tokai.jaeri.go.jp
Nobuo OUCHI ouchi at linac.tokai.jaeri.go.jp
Shinya SAWADA: shinya.sawada at kek.jp
English Editor:
Dick Mischke mischke at triumf.ca
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