[Neutron] J-PARC Newsletter No. 75
shibata.kaoru
shibata.kaoru at jaea.go.jp
Fri Aug 9 04:52:48 CEST 2019
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J-PARC Project Newsletter
No.75, July 2019 Japan
Proton Accelerator Research Complex under operation jointly by the High
Energy Accelerator Research Organization (KEK) and the Japan Atomic Energy
Agency (JAEA) http://j-parc.jp/index-e.html
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HEADLINES AND CONTENTS
1. [Overview]
SUMMER SHUTDOWN TO ENTER NEW PHASE OF BEAM POWER
2. [Accelerator Division]
STABLE AND 1 MW DEMONSTRATION FOR MLF, AND HD OPERATION BUT
MR SUSPENSION.
3. [Particle and Nuclear Physics Division]
BEAM TIME FOR THE HADRON EXPERIMENTAL FACILITY.
STATUS OF THE COHERENT MUON TO ELECTRON TRANSITION (COMET).
STATUS OF THE MUON G-2/ ELECTRIC DIPOLE MOMENT (EDM) (E34).
DEVELOPMENTS FOR HORN AND TARGET UPGRADES AND NEUTRINO
INTERACTION STUDIES AT NEAR DETECOR SYSTEM.
4. [Materials and Life Science Division]
STABLE USER PROGRAM OPERATION HAD BEEN CONTINUED AT 500 KW.
THREE HUNDRED SEVENTY NINE NEUTRON GENERAL PROPOSALS HAVE
BEEN RECEIVED FOR THE 2019B PERIOD.
CONSTRUCTION OF ELECTRIC POWER SUBSTATION FOR H-LINE
IN PROGRESS.
5. [Nuclear Transmutation Division]
SECOND INFORMATION EXCHANGE MEETING ON ACCELERATORS FOR
ADS BETWEEN SCK*CEN AND J-PARC WAS HELD.
6. [Safety Division]
FY2019 SAFETY DAY AT J-PARC.
THE APPLICATION FOR A LICENSE OF THE OPERATION WAS GRANTED.
7. [Editorial Note]
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1. [Overview] by Naohito SAITO
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SUMMER SHUTDOWN TO ENTER NEW PHASE OF BEAM POWER
We entered the summer shutdown after about three months of beam time in
this fiscal year 2019. While the operation of MLF was very successful with
the high availability of 94% or more, it is our deep regret that we had to
postpone the Main Ring (MR) beam time, which corresponds to about two months
or more, due to the malfunction of the bending magnet in the Beam Transport
from 3 GeV Synchrotron to the Main Ring (3-50-BT). This beam time at the MR,
which was divided into slow and fast extraction roughly 1 to 2, had to be
delayed until the beam time in autumn, when the newly made coil for the
bending magnet will be ready for operation.
Hadron Experimental Facility (HEF) is going through the replacement of the
target system, where the cooling power is almost doubled to reach its
acceptable beam power of 80 kW or more. We are very excited about the
possibility to come back to the SX beam with a higher beam power in next
February.
In the beginning of July, we performed more than 10 hours of continuous
operation of the MLF with 1 MW. The accelerator and the target systems both
for neutron and muon performed with the excellent stability as expected.
Some neutron scattering measurements were also done to show an extremely
high- quality measurement in a short time period thanks to the higher power
beam. We think we have gained a good experience and accumulated a good
confidence by this 10 hour-trial run, which will benefit the higher power
run in autumn beam time. With the successful trial operation of MLF at 1 MW,
and the new target in the HEF to go to higher beam power, and furthermore,
ongoing construction of the power supply for MR, we are getting more ready
for higher power operation at entire J-PARC facility, which we expect to
result in qualitatively new results. We are very happy to share the
excitement of this new phase of stable and high power beams with all users!
More beams for more excitements!
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2. [Accelerator Division] by Kazuo HASEGAWA
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STABLE AND 1 MW DEMONSTRATION FOR MLF, AND HD OPERATION
BUT MR SUSPENSION.
After the replacement of the ion source at the end of March, we started
new Run#82. We delivered beams for user operation of the Materials and Life
Science Experimental Facility (MLF) at the beam power of 500 kW. The user
operation for the MLF ended in the morning of July 3. The operation was very
smooth and the availability from April was high at about 96%. We had an
accelerator study time until the morning of July 8 and stopped the operation
as summer shutdown. In the beginning of the study time, we successfully
delivered 1 MW to the MLF for ten and half hours. The linac, the 3 GeV Rapid
Cycling Synchrotron (RCS), and the neutron target were very stable during
this
1 MW operation. We had only three short beam stops and the availability was
roughly 99%. We have demonstrated the 1 MW operation for one hour last year.
We have experienced the longer time operation and accumulated the
experiences toward the goal of the MLF operation.
The failure of the bending magnet, which occurred in March, in the beam
transport line from the RCS to the Main Ring (MR) was patched up and beam
was resumed on April 4 for the hadron experimental facility (HD). The beam
power was 50 kW as before the suspension. But on April 24, it was observed
that the field strength dropped by 2 %, which was much severe than that in
March. After the investigation, we found insufficient insulation between
conductors in coils. As a result, we had a conclusion that continuation of
the stable operation of the MR was difficult. Therefore, user operation of
the MR will be resumed in the beginning of November, after the replacement
of the failed coil.
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3. [Particle and Nuclear Physics Division] by T. NOMURA, T. TAKAHASHI,
K.OZAWA, S. MIHARA, T. MIBE, T. ISHIDA, M. HARTZ
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BEAM TIME FOR THE HADRON EXPERIMENTAL FACILITY.
(by T. NOMURA, T. TAKAHASHI, K. OZAWA)
Slow extraction (SX) beams from Main Ring were delivered for user
operation from Feb. 9 to Mar. 18 and from Apr. 4 to Apr. 24.
In the beam time, three experiments were conducted. The E14/KOTO
experiment resumed taking physics data. KOTO had successfully finished
detector upgrades before the beam time. One of the new features is a
both-end readout scheme for the electromagnetic calorimeter. It provides a
depth information of the particle shower in the calorimeter and helps to
distinguish a photon-induced shower from a neutron-induced one. A quick
analysis during the run shows that a sufficient reduction power against
neutron backgrounds can be achieved.
At the K1.8 beamline, a new experiment E40 was conducted to study
hyperon nucleon interactions using scatterings of Sigma hyperons on proton.
In the experiment, Sigma hyperons are produced by the (pi, K+) reaction on a
liquid hydrogen target and are scattered by protons in the same target. The
emitted K+ is detected by the KURAMA spectrometer, and a Sigma-hyperon
proton scattering is reconstructed with a newly installed detector system,
CATCH. E40 collected
Sigma- proton data and a half of Sigma+ proton data.
At the K1.8BR beamline, a pilot run of the E57 experiment was conducted.
The E57 experiment aims at measuring of X-rays from Kaon-deuteron atoms. In
this beam time, the E57 acquired data for Kaonic-hydrogen atoms to confirm
the performance of detector and backgrounds.
STATUS OF THE COHERENT MUON TO ELECTRON TRANSITION
(COMET) (by S. MIHARA)
The COMET experiment aims to search for the lepton-flavor violating muon
reaction, mu-e conversion, with sensitivity better than 10^{-14} in Phase I.
Construction of the COMET facility along with detector R&D is in
progress. Status and plan of construction was intensively discussed in a
collaboration meeting held in June 10-14 at J-PARC.
The KEK-IPNS muon group co-hosted an international conference,
CLFV2019 https://conference-indico.kek.jp/indico/event/70/
held in Fukuoka. Status report of the COMET experiment was given by a COMET
collaborator and many poster presentations were made to report research
status ongoing in the COMET collaboration.
Organization of this conference was supported by KEK International
Cooperation Office.
STATUS OF THE MUON G-2/ ELECTRIC DIPOLE MOMENT (EDM) (E34)
(by T. MIBE)
The E34 collaboration prepares for precision measurements of the muon
anomalous magnetic moment and electric dipole moment.
Following an approval on stage 2 status for the experiment, the experiment
works with KEK for funding request.
A task force was formed under the J-PARC center to discuss technical
issues on extending the H-line area.
The collaboration had an open collaboration meeting in Seoul National
University on June 24-27 to share the overall schedule and development
progress including realization of a thermal-energy muon source and other
areas.
DEVELOPMENTS FOR HORN AND TARGET UPGRADES AND NEUTRINO
INTERACTION STUDIES AT NEAR DETECOR SYSTEM
(BY T. ISHIDA, M. HARTZ)
The Main Ring operation was terminated in late April due to a trouble of
a bending magnet. The fast extraction mode operation for T2K experiment will
be resumed from autumn after fixation of the problem.
The electromagnetic horns and neutrino production target are developed
and fabricated with firm international collaboration. In the beginning of
2019, 3rd generation horn-1, assembled at University of Colorado at Boulder,
U.S.A., and a new production target, fabricated at STFC Rutherford Appleton
laboratory, were imported and delivered to J-PARC, and integration work is
now in very good progress. From this June, long-term test operation of the
new horn has been started, and operation with 320kA current is successfully
continuing. With the current, more than 10% gain is expected at far detector
flux in comparison with current 250 kA operation.
To reduce systematic errors on neutrino interactions is another key to
achieve CP violation measurement. The T2K near detector system, located 280m
downstream of the target, has been making world-leading researches on
neutrino-nucleus interactions with unprecedented statistics delivered from
the J-PARC beam.
Recent publication: “Characterization of nuclear effects in muon-
neutrino scattering on hydrocarbon with a measurement of final-state
kinematics and correlations in charged-current pionless interactions at
T2K” Phys. Rev. D 98, 032003 (2018), DOI: 10.1103/PhysRevD.98.032003
The modeling of nuclear effects in neutrino nucleus scattering
introduces the largest systematic uncertainties in neutrino oscillation
measurements. By measuring the recoil hadrons from neutrino-nucleus
interactions, it is possible to better constrain these nuclear models.
In this result, T2K has measured the kinematic properties of both final
state muons and recoil protons using the ND280 near detector. T2K also
studies interesting projections of the data in the direction transverse to
the neutrino beam that more directly probe the physics of the target
nucleus. T2K finds that the data is best described by initial state models
of the nucleus that account for correlations between the Fermi motion of
constituent nucleons and their position or energy level in the nucleus.
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4. [Materials and Life Science Division] by Toshiji KANAYA
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STABLE USER PROGRAM OPERATION HAD BEEN CONTINUED AT
500 KW
1) Neutron Source
The beam operation of 500kW is going very well with a good availability
of 96.2% since April 1, as of June 12 in 2019. At the end of this run time,
1MW beam operation with the duration time of
12 hours is going to be held on July 3 from 10:00 to 22:00 which is much
longer than the 1MW operation of 1 hour last year. Much facility data of
high power operation are expected to be obtained.
THREE HUNDRED SEVENTY NINE NEUTRON GENERAL PROPOSALS HAVE
BEEN RECEIVED FOR THE 2019B PERIOD
2) Neutron Instruments and Science
Neutron Instruments and Science Call for General proposals and New User
Promotion proposals for the 2019B period was closed on June 7 and we
received 379 neutron proposals. In the Long Term Proposal starting with
2019B, 6 projects were proposed and as a result of document review, 4 of
them were sent to the listening board. Those proposals will be sent to the
Neutron Science Proposal Review Committee / the Proposal Evaluation
Committee for reviewing process. Final results will be sent to users in
September.
The first half of user program of 2019A period was ended in the morning of
July 3. The second half will be resumed from November 5.
CONSTRUCTION OF ELECTRIC POWER SUBSTATION FOR H-LINE
IN PROGRESS
3) Muon Science Facility (MUSE)
Among the muon beamlines envisaged in the original plan of MLF, the
H-line in experimental hall No. 1 has been in the stage of waiting for
funding from MEXT for years. Given such a situation, the J-PARC head
quarter decided to provide a partial support for putting the plan forward.
The support is primarily for the construction of new electric power
substation to cover the huge demand of electricity expected upon the full
operation of the H-line. Following the installation of cable racks, pitting
of MLF building wall, and outdoor structures in FY2017, the civil
engineering work for the substation site near the MLF building continued
towards the end of FY2018. Now the installation for the access to
electricity is in progress on the substation site.
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5. [Nuclear Transmutation Division] by Hayanori TAKEI
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SECOND INFORMATION EXCHANGE MEETING ON ACCELERATORS FOR
ADS BETWEEN SCK*CEN AND J-PARC WAS HELD.
Second information exchange meeting on accelerators for ADS between
SCK*CEN and J-PARC was held at Cyclotron Resources Centre of
Louvain-la-Neuve, Belgium from April 10 to 11, 2019. SCK*CEN has been
working on the MYRRHA (Multipurpose hYbrid Research Reactor for High-tech
Applications) project. MYRRHA is about 100 MWth (MW thermal) research and
demonstration facility for ADS concept.
About 10 researchers from SCK*CEN mainly from the accelerator development
team and 4 researchers from J-PARC took part in the meeting. Many topics
such as the current status of accelerator development at MYRRHA,
accelerator-operation experiences and future development plans at J-PARC
were presented in this meeting. In particular, participants discussed how to
achieve the high reliability required of the ADS accelerator. One of the
methods was the development of the solid state RF reported from SCK*CEN.
Since the exchanging information meeting had great benefits for both sides,
we decided to hold the next meeting at J-PARC about one year later.
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6. [Safety Division] by Kotaro BESSHO and Yoshihiro NAKANE
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FY2019 SAFETY DAY AT J-PARC
The J-PARC Center sets "the Safety Day" around May 23 on which the
radioactive material leak incident occurred in 2013. The Safety Day in
FY2019 was held on May 24.
The meeting for exchanging information on safety efforts was held in
the morning. Some good-practices were awarded by the J-PARC director.
Furthermore, three talks were presented; (1) A scientific talk related to
quick evaluation of high-level personal doses exposed in an accelerator
tunnel during beam operations, (2) Consideration to safe transportation of
highly-activated target vessel used at Materials and Life Science
Experimental Facility (MLF), and (3) Safety measures after the fire of a
temporary power generator.
In the afternoon, the Workshop for Fostering Safety Culture was held.
The main talk entitled "Human power required for strong and safe
organization" was given by Dr. Yayoi Nagai (Office KAZE NO MICHI).
THE APPLICATION FOR A LICENSE OF THE OPERATION WAS GRANTED
The application for changes of the radiological license was granted by
the Nuclear Regulation Authority (NRA) on June 12. The approved changes in
the application were the materials irradiation experiment at the Main Ring
Synchrotron, the minor change of the radiation safety interlock system of
the Rapid Cycling Synchrotron and so on.
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7. [Editorial Note]
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Information on the project can be also obtained at the web site:
http://j-parc.jp/c/en/topics/project-newsletter/index.html
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Editorial Board:
Toshifumi TSUKAMOTO (Chair): toshifumi.tsukamoto at kek.jp Kaoru SHIBATA:
shibata.kaoru@ jaea.go.jp Takashi ITO: itou.takashi at jaea.go.jp Dick MISCHKE
(English Editor): mischke at triumf.ca Tomoko KAWAMURA (Secretary):
kawamura.tomoko at jaea.go.jp
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