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J-PARC Project Newsletter
_______ No. 12 May, 2003 _______
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. <<Accelerator Group>>
.THE BEAM TEST OF THE MEBT SUCCESSFULLY FINISHED.
.FULL HIGH POWER TEST OF THE MR RF SYSTEM.
2. <<Nuclear and Particle Physics Group>>
.THE FIRST MEETING OF THE NUCLEAR AND PARTICLE PHYSICS
FACILITY COMMITTEE WAS HELD.
3. <<Neutron Science Group>>
.ALL BIDS FOR LINE ITEM COMPONENTS FOR FY2002 HAVE BEEN AWARDED
AS SCHEDULED AND WITHIN THE BUDGET EXPECTED.
4. <<Muon Science Group>>
.THE FIRST J-PARC MUON SCIENCE EXPERIMENTAL FACILITY ADVISORY
COMMITTEE, SO CALLED JMUSAC WAS HELD ON 2003, FEB.7 AT KEK.
5. <<Nuclear Transmutation Group>>
.INTERNATIONAL SYMPOSIUM ON ACCELERATOR DRIVEN TRANSMUTATION
SYSTEM AND ASIA ADS NETWORK INITIATIVE WAS HELD.
6. <<Radiation Safety Group>>
.THE 2ND SAFETY DELIBERATIVE COMMITTEE ON RADIATION SAFETY
WAS HELD.
7. <<Integrated Control Group>>
.STATUS OF THE CONTROL SYSTEM OF THE 60-MEV LINAC.
8. <<Facility Construction Group>>
.CONSTRUCTION CONTRACTS PLANNED IN FY2003 AT JAERI WERE
COMPLETED ON SCHEDULE.
.CONSTRUCTION OF THE 50GeV SYNCHROTRON BUILDING IS PROCEEDING.
9. <<Announcement of Symposia and Meetings>>
10. <<Editorial Note>>
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1. <<Accelerator Group>> by Yoshisige YAMAZAKI
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.THE BEAM TEST OF THE MEBT SUCCESSFULLY FINISHED.
The beam test of the Medium Energy Beam Transport (MEBT)
was successfully finished. The system is comprised of a volume
production type H-minus ion source without cesium, a Low Energy
Beam Transport (LEBT) with focusing solenoids and a prechopper,
the 3-MeV, 324-MHz Radio-Frequency Quadruple (RFQ) Linac with the
PI-mode Stabilizing Loop (PISL), and the MEBT with an RF chopper.
The test was done with the maximum peak current of 30 mA, which
was the design value of this RFQ linac (This RFQ was designed for
the JHF, the peak current of which was 30 mA, in contrast to the
50 mA for the J-PARC project). The beam emittance was measured,
while the prechopper and the chopper were beam tested.
.FULL HIGH POWER TEST OF THE MR RF SYSTEM.
The RF systems for both the 3-GeV Rapid-Cycling Synchrotron
(RCS) and the 50-GeV Main Ring (MR) will make use of the cavities
loaded with Magnetic Alloy (MA). The MR RF system was successfully
high-power tested with a full peak RF power of 500 kW and a full
duty factor of 50 per cent for 49 hours.
.A-TAC MEETING.
The 2nd meeting of the Accelerator Technical Advisory
Committee (ATAC) was held on March 7th and 8th.
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2. <<Nuclear and Particle Physics Group>> by Jun IMAZATO
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.THE FIRST MEETING OF THE NUCLEAR AND PARTICLE PHYSICS
FACILITY COMMITTEE WAS HELD.
On March 22, the first meeting of the Nuclear and Particle
Physics Facility Committee (NPFC) was held at KEK. This committee
was established under the project director to deliberate necessary
issues for the experimental facility design and construction at the
50 GeV synchrotron. It should screen the Day-1 experiments in
Phase 1 as well, and thus it functions as the pre-PAC. The primary
role of the committee at this stage of construction is to make a
policy for beam line installation in the slow-extracted beam hall
(NP Hall) by evaluating Letters of Intent for experiments and future
plans. The authorization of the fast-extraction beam with the
neutrino oscillation experiment is also an important milestone.
In the meeting all 16 committee members, most of whom were
elected in the Advisory Council for Scientific Policy and Management
of Institute of Particle and Nuclear Studies, got together. The
project team presented the construction status of the accelerator
and facilities. Regarding the neutrino oscillation a detailed
explanation of its LoI was presented. This time it was decided to
perform screening other LoIs in the second meeting to be held in
June 26-28. As for the neutrino oscillation experiment the committee
evaluated its scientific significance as very high and endorsed its
early realization. At the same time it recommended a technical
review of the beam line and target station, etc.
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3. <<Neutron Science Group>> by Yujiro IKEDA
(Materials & Life Science Experimental Facility Group)
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.ALL BIDS FOR LINE ITEM COMPONENTS FOR FY2002 HAVE BEEN
AWARDED AS SCHEDULED AND WITHIN THE BUDGET EXPECTED.
In total, 13 bids of the Materials & Life Science Facility
(MLF) structural components have been awarded by the end of March,
2003, as scheduled within the budget scheme expected. In addition
to those reported before, the target cart, master slave manipulators,
and water cooling system of the beam transport line were contracted.
The detailed design for manufacturing is under way.
Investigation of the pitting with the MIMTM (Magnet IMpact
Testing Machine) is still continuing. Currently, a test with more
than 50 million cycles of negative pressures on the SS-316 sample has
been completed. These tests are ongoing.
The Neutron instrument planning committee has organized a
working group to review 18 proposals of instruments from users and
the project team, in terms of their technical merits along with their
adequacy for the J-PARC mission. Five working groups formed
corresponding to their specific research areas have been deliberating
to arrive at peer reviewed results to report to the committee.
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4. <<Muon Science Group>> by Yasuhiro MIYAKE
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.THE FIRST J-PARC MUON SCIENCE EXPERIMENTAL FACILITY ADVISORY
COMMITTEE, SO CALLED JMUSAC WAS HELD ON 2003, FEB.7 AT KEK.
The first J-PARC Muon Science Experimental Facility
Advisory Committee, so called JMuSAC was held on 2003, Feb.7 at KEK,
which reports to the J-PARC Project Director during the construction
period. Committee members were J. M. Poutissou (Chair; TRIUMF Lab.),
J. Akimitsu (Aoyama Gakuin U), S. Ikeda (KEK), Y. Ikeda (JAERI),
M. Iwasaki (RIKEN), K. Nagamine (KEK), N. Nishida (Tokyo Inst. Tech.),
Y. Miyake (KEK), Y. Yamazaki (JAERI), H. Yasuoka (JAERI),
R. H. Heffner (Los Alamos Lab.), C. Petitjean (Paul Scherrer Inst.),
L. I. Ponomarev (Kurchatov Inst.). As observers,
J.Sonier (the vice president of ISMS of North America) and
R. Cywinski (the vice president of ISMS of Europe) attended the
meeting.
In the committee meeting, the project definition of the
experimental facility to be constructed in the Materials and Life
Science Facility of J-PARC, and the content of the 1st phase
experimental program were reviewed and also valuable advice was given
to the muon science working group.
Brief comments were presented at the international advisory
committee meeting by Dr. J. M. Poutissou, chair of the committee.
The final committee report will be produced shortly.
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5. <<Nuclear Transmutation Group>> by Hiroyuki OIGAWA
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.INTERNATIONAL SYMPOSIUM ON ACCELERATOR DRIVEN TRANSMUTATION
SYSTEM AND ASIA ADS NETWORK INITIATIVE WAS HELD.
Aiming to enhance international collaboration and the
multidisciplinary synergetic effect on the ADS development, the
"International Symposium on Accelerator Driven Transmutation System
and Asia ADS Network Initiative" was held on March 24 and 25, 2003,
in Tokyo. This symposium was coordinated by JAERI, KEK, Kyoto
University, Osaka University, and Tokyo Institute of Technology.
At the beginning of the symposium, Prof. B. Richter, the former
director of SLAC, made a presentation on the current activities on
partitioning and transmutation technology in USA.
Representatives from Europe, Japan, Korea and China then
explained their status and plans for R&D on ADS. The present status
of the accelerator technology and the nuclear data was also reviewed.
After these presentations, importance of international collaborations
to solve technical issues on ADS development was discussed. It was
approved that a wide network for information exchange should be
established as the first step, and then bilateral or multilateral
collaborations should be enhanced. Particularly among Asian
countries, such collaboration should be activated because there is
no tight collaboration presently.
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6. <<Radiation Safety Group>> by Nobuo SASAMOTO
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.THE 2ND SAFETY DELIBERATIVE COMMITTEE ON RADIATION SAFETY
WAS HELD.
The 2nd safety deliberative committee on Radiation safety
was held at KEK on February 26, 2003. The committee gave approval
to establish two expert committees on the interlock system and the
neutron source. In this meeting, safety issues, policy, design
criteria, design methods and design parameters were discussed.
The applications for the safety of two experimental
facilities:
(1) Material and Life Science experimental facilities (MLF), which
includes the 3-NBT beam line, the Muon Science Facility, and the
Neutron Science Facility, and
(2) Nuclear and Particle Physics Facilities,
were submitted to the Nuclear Energy Safety Division, Department of
Civil Affairs and the Environment, Ibaraki Prefecture Government,
and the applications were approved for the construction of these
facilities. The construction of the 3-NBT beam line is scheduled
to start in March, 2003, and the others in the fiscal year of 2003.
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7. <<Integrated Control Group>> by Junsei CHIBA
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.STATUS OF THE CONTROL SYSTEM OF THE 60-MEV LINAC.
The Drift tube linac (DTL) is now being installed at the
KEK site as a part of the 60-MeV Linac. The DTL1 will be ready at
the end of May to accelerate proton beam up to 20 MeV. A newly
developed Ethernet interface board will be used for the Q magnets of
the DTL1. The board was tested with a small number of magnet power
supplies. Nearly 100 of them are being used this time. Additional
progress is expected on the use of programmable logic controllers
(PLC's). Thus far only a few PLC's are used, such as to control the
ion source. About 20 PLC's, including the RF power source control,
will be added in the control system operated via the EPICS IOC's.
Also the EPICS driver of the WE7000 measurement station will be used
in real operation for the first time.
The interlock system, which is divided into two parts,
the personal protection system (PPS) and machine protection system
(MPS), is very important and should be extremely reliable.
The present status of the interlock system is as follows.
The design of the PPS has been completed for the LINAC, L3BT
(Linac-3GeV RCS Beam Transport line) and is almost completed for the
3NBT (3GeV RCS - Neutron facility Beam Transport line). The design
for the RCS and MLF should be completed soon. The MPS design work
is a bit slow, since the MPS unit, which is the heart of the system,
was found to have problems with noise.
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8. <<Facility Construction Group>>
by Hideo NARUSE and Takashi NANBU
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.CONSTRUCTION CONTRACTS PLANNED IN FY2003 AT JAERI WERE
COMPLETED ON SCHEDULE.
Detailed design for the construction of the Material and
Life Science Facility Building was completed and the construction
will be contracted within the first half of FY2003. The excavation
work for the Linac Building is proceeding favorably.
.CONSTRUCTION OF THE 50GeV SYNCHROTRON BUILDING IS PROCEEDING.
Construction began, and four months has passed. It began
with a meeting to explain to neighborhood residents about clearing
the forest and exploratory drilling to explore archeological
excavation, which were performed by the Ibaraki Local government.
Due to the discovery of some archeological findings, detailed
exploration is planned during FY2003 and the construction schedule
will be restructured. Now, the excavation work is proceeding for
the 50GeV Synchrotron Building.
On the other hand, drying up of the wells was reported by
the neighborhood residents. We are now solving the problem.
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9. Announcement of Symposia and Meetings
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1) The Neutron Instrument Planning committee May 8.
2) The Nuclear and Particle Physics Facility Committee (NPFC)
June 26-28.
3) International Symposium on Pulsed Neutron Science and Instruments
(IPN2003)
Oct 27 - 30, 2003 in Tsukuba, Japan.
4) UK-Japan Neutron Science Workshop (UKJ2003)
Oct 31 - Nov 1, 2003 in Izura SPA (Pacific seaside), Japan.
5) Neutron Detector Workshop (NPSD2003)
Oct 31 - Nov 1, 2003 in Tsukuba, Japan.
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10. 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@lanl.gov
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