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JAERI-KEK Joint Project Newsletter No. 7 January, 2002
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High Intensity Proton Accelerator Project proposed jointly
by the Japan Atomic Energy Research Institute (JAERI)
and the High Energy Accelerator Research Organization (KEK)
http://jkj.tokai.jaeri.go.jp/
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1. Recent Progress of the Joint Project between JAERI and KEK on High-
Intensity Proton Accelerators (Shoji NAGAMIYA)
2. Report from the Accelerator Group (Yoshishige YAMAZAKI)
3. Report from the Nuclear and Particle Physics Experimental Facility
(Shinya SAWADA)
4. Report from the Neutron Science Group (Yukio OYAMA)
(Materials & Life Science Experimental Facility Group)
5. Report from the Muon Science Group (Yasuhiro MIYAKE)
6. Report from the Accelerator Driven Transmutation (ADS)
Experimental Facility Group (Hiroyuki OIGAWA)
7. Activities of (JAERI) Facility Construction Group (Hideo NARUSE)
8. Announcement of Workshop and Important Committee Meeting
9. Editorial note
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1. Recent Progress of the Joint Project between JAERI and KEK on High-
Intensity Proton Accelerators
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by Shoji Nagamiya
Happy New Year! This year is the second year for construction
of the Project.
At the end of the last year we heard a plan for the budget for
JFY2002 (which starts on April 1, 2002). As a whole, we heard very
encouraging budget figures for the project. The construction of the
50 GeV tunnels and associated buildings will start with a more
accelerated budget profile than we anticipated. By exploiting the joint
nature of the Project, some budget items were transferred from one
institution to the other to allow easier funding from the point of view
of the Government. We were also informed by the Government that this
project was strongly encouraged by many divisions of the Government and,
thus, protected.
On the other hand, we will have a somewhat complicated year for
both JAERI and KEK in terms of their organizations. At the end of
December, 2001, it was decided that JAERI and JNC (Japan Nuclear Cycle
Development Institute) would merge together to form one gigantic
institution. Here, the merger was decided to make the Japanese nuclear
power research efficient. Our project will still be regarded as one
of the important projects at the new organization, but the situation
around us will become more complicated than before. The actual merger
will occur in 2004.
In addition, the Government is now discussing a unification of
all National Laboratories that were previously supported by Monbu-sho
(the former Ministry of Education and Science). KEK is included in
these Laboratories. Very intense discussions on this unification are in
progress. Within a month or two, the decision on this unification will
be made. Again, the situation around us will be influenced largely by
the forthcoming decision on these National Laboratories.
Concerning the project itself, we have been making very steady
progress. As I mentioned in the previous Newsletter, we heard exciting
news on the success of the ion source performance and the RFQ performance,
etc. See the article on the accelerators in this Newsletter for recent
developments. Also, several workshops have been organized during the
late fall in 2001 on accelerators, nuclear/particle physics, etc.
Planning and actual fabrication work is actively in progress on all
aspects of the project.
In 2002 the construction of all the accelerators (Linac, 3 GeV
and 50 GeV) as well as neutron/muon experimental areas will take place.
We all hope that the year 2002 is a fruitful and successful year for
the project.
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2. Report from the Accelerator Group
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by Yoshishige YAMAZAKI
The second technical meeting of the accelerator group was held on
the 15th and 16th of last November. This kind of meeting (ours is held
every half year) is really necessary for a big group like ours, in order
to make all the group members familiar with the system in total. Every
member will be aware of what kind of role he or she is playing in the
total system. One can work with a good feeling of balance and
responsibility. Also, mutual criticism within the team is very important
for making the group healthy and for making full use of all the expertise
of the team members as well as the review and advice from outside. Two full
days are the maximum for this purpose, that is, for making almost all the
members attend the meeting, since everybody is so busy with the
construction. As a result, hot discussion continued until 8 o'clock in two
evenings. Approximately ninety members participated in all of the meeting.
The technical design report (TDR) is now being written by almost all
the team members. The first draft should be ready by January 15th.
Afterwards, some editing work will be necessary to make all the
descriptions sensible from the viewpoint of feasibility and optimization,
and to make all the contents consistent with each other. We estimate that
this work will take at least two months to complete.
It was already reported that a peak current of 60 mA was obtained
from the negative hydrogen source with cesium. A source without the
cesium is also under development. Recently, a peak current of 20 mA was
observed, and work is still in progress. This development will continue
until the potential harm of the cesium gas on the discharge limit of the
following RFQ has been totally eliminated.
The H minus peak current of 8 mA was transported through the 3-MeV
medium energy beam transport (MEBT) without any observable beam loss. The
drift tubes for the first tank of the drift-tube linac (DTL), which
follows the MEBT, are being installed. The installation will be completed
in this fiscal year. The remaining two tanks are also waiting for the
installation of drift tubes. The first two tanks of the following
separated DTL(SDTL) were fully power-tested up to the nominal power and
are ready for the beam acceleration. The next ten tanks are now under
construction and the specifications for the remaining twenty tanks up to
200 MeV were completed are ready to be sent out for bid.
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3. Report from the Nuclear and Particle Physics Experimental Facility
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by Shinya SAWADA
The International Workshop on Nuclear and Particle Physics at
50-GeV PS was held at KEK on December 10 - 12, 2001. About 100 people
from the domestic and international physics communities attended the
workshop and discussed physics programs and design of experimental areas.
The workshop consisted of plenary sessions and four parallel sessions.
In the plenary sessions, keynote talks on possible major physics topics
were given, after an overview of the project, the schedule and some
details on the accelerator configurations were presented. In the parallel
sessions, the participants were divided into four parallel working groups
and discussed the following subjects:
WG1:Strangeness Nuclear Physics Experiments,
WG2:Nuclear/Hadron Physics Experiments,
WG3:Kaon/Muon Rare Decay Experiments,
WG4:Neutrino Experiments
There was an open discussion at the end of the workshop. Many
physicists emphasized the uniqueness and importance of this facility,
along with the need for more beam lines. The importance of fixed-
target machines for the education of graduate students was also mentioned.
The international aspect of this facility was emphasized, especially
by the foreign physicists, and the need for more up-to-date information was
mentioned. All the participants agreed that they would continue
collaborative work, especially for letters of intent, which will be called
in the near future.
The web page of the workshop, "http://www-jhf.kek.jp/NP01/", now
includes a copy of the transparencies used for the presentations. The
next international workshop, NP02, will be held in September or
October, 2002, around the time of the PANIC02 conference
(http://www.rcnp.osaka-u.ac.jp/~panic02/).
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4. Report from the Neutron Science Group
(Materials & Life Science Experimental Facility Group)
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by Yukio OYAMA
A committee is being formed to discuss the neutron beam line
instrumentation (spectrometers). All proposals for instrumentation at the
neutron facility will be reviewed by this committee. Research organizations
or groups that intend to place their instrumentation at the facility are
asked to prepare documentation for their proposals including construction
schedule, resources and funding. These groups are registered under the
project team to communicate closely with each other as an informal neutron
instrumentation group. The project team will support the activities by these
groups to make good proposals. For this purpose the project team has also
proposed ten instruments selected by considering previous
discussions in the instrumentation workshop and within the project team.
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5. Report from the Muon Science Group
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by Yasuhiro MIYAKE
In order to reduce the production of NOx, which causes erosion, we
are designing the air-gap in the vicinity of the muon production target
between the magnets/chambers and the shield blocks to be as small as
reasonably possible. On the other hand, we have to design an
air-circulating system that removes not only 90 kW of heat loss from the
magnets, target and power cables, but also ventilates a certain fraction
of the air to keep the inside of the primary proton line at a negative
pressure to satisfy the requirement of not violating the permitted
radiation level at the site boundary. Therefore, a quantitative evaluation
on the air flow through the non-uniform narrow gaps between the
magnets/chambers and shield blocks was found to be essential. For
simulating this complicated system, we made a miniature model of the proton
beam line in the vicinity of the muon production target. Through these
tests, we realized several points in the initial design where the air-flow
would be very poor in the secondary beam lines and several magnets in the
primary beam line. By fixing those problems, consequently, we made a
possible scenario of the air-circulating system, which will be realized
for the construction of the facility. Also we are planning to test a
possible scenario for retrieving spilled water.
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6. Report from the Accelerator Driven Transmutation (ADS)
Experimental Facility Group
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by Hiroyuki OIGAWA
As part of the conceptual design of the ADS Target Test Facility,
a thermal-hydraulic calculation was performed for the Pb-Bi target. It
was shown that the temperature of the beam window can be controlled below
500 degree centigrade under the conditions of a flat beam of 4cm diameter,
a proton beam power of 200kW, and the inlet Pb-Bi temperature of 330 degree
centigrade. Further effort has been invested to optimize the temperature
distribution of the beam window and irradiation samples in the target
volume. The Pb-Bi test loop is now being remodeled in order to equip an
oxygen control device.
Safety analyses for the Transmutation Physics Experimental
Facility have continued. The SIMMER-III code, which is famous as the
most advanced safety analysis code for fast reactors, was partly modified,
and preliminary calculations have been started in cooperation with
the Japan Nuclear Cycle Development Institute (JNC). Basic experiments
for subcritical reactor physics have been performed at the Fast Critical
Assembly (FCA), where the feasibility of the reactivity and the source
intensity measurements using the dynamic method are being investigated.
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7. Activities of (JAERI) Facility Construction Group
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by Hideo NARUSE
A general survey of the whole construction site including the south
area for the project has been started. Boring and exploration by the
shallow seismic reflection method have been completed. The subterranean
water survey will be continued till the end of March and various types of
investigations and analyses will be conducted in order to prepare the
basic data for the detailed design and construction. As for the Linac
Building, coordination with the interior equipment is progressing
based on the shorter length plan (with tunnel length of approx. 350m and
acceleration energy of 450MeV) and the result of the structural study of
the accelerator tunnel that was made in May, 2001. Detailed design will
be completed by the end of March, 2002. As for the 3GeV Synchrotron
Building, the accelerator required longer peripheral length of the tunnel
by 10/9 times compared to that of the old plan last year, and the final
specification of the building was presented in the beginning of December,
2001. In response to the specification, basic coordination with devices
for the detailed design is underway. The detailed design for the
infrastructure is in progress, which includes development of the site,
exteriors for the Linac and the 3GeV Synchrotron Building, high-voltage
electricity receiving/transforming substation based on the discussion with
Ministry of Economy, Trade and Industry, etc., the security road based
on the requirements from Tokai Village and so on, a temporary bridge and
a surplus soil yard based on discussions with JNC and Ibaraki Prefecture,
etc. Also, applications for permission for forestland development and
for lifting of the protected forest designation were filed to Ibaraki
Prefecture on December 28, 2001. Construction of the Linac Building,
development and exteriors related to the Linac and the 3GeV Synchrotron
Building, construction of the security road, relocation of the existing
facilities, etc. are planned to be contracted by the end of March, 2002.
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8. Announcement of Workshop and Important Committee Meeting
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Workshop on Nuclear Transmutation and Nuclear Physics
January 24, 25, 2002 at JAERI
User Advisory Committee meeting
February 8, 2002 at KEK
International Advisory Committee meeting
March 5,6, 2002 at JAERI
Workshop on Slow Dynamics of Soft-matter and Biological Macromolecule
studied by Neutron Scattering. March 7,8, 2002 at KEK
Workshop on Muon Science
March 7,8,9 2002 at KEK and RIKEN
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9. Editorial note
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Editorial Board:
Masatoshi ARAI (chair): masatoshi.arai@kek.jp
Koji YOSHIMURA koji.yoshimura@kek.jp
Yujiro IKEDA: ikeda@cens.tokai.jaeri.go.jp
Nobuo OUCHI ouchi@linac.tokai.jaeri.go.jp
Shinya SAWADA: shinya.sawada@kek.jp
English Editor:
Dick Mischke mischke@p25hp.lanl.gov
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-- -------------------------------------------------------- | Shin'ya Sawada (Email: shinya.sawada@kek.jp) | | JHF Project Office | | High Energy Accelerator Research Organization (KEK) | | 1-1 Oho, Tsukuba, Ibaraki, 305-0801 Japan | | Tel: +81-298-64-5680, Fax: +81-298-64-5258 | --------------------------------------------------------
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