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     J-PARC Project Newsletter
                                                    special issue, May 2015
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. [Particle and Nuclear Physics Division]

HADRON EXPERIMENTAL FACILITY RESTARTED THE USER OPERATION. 

2. [Materials and Life Science Division]

500KW PROTON PULSE PRODUCES THE HIGHEST NEUTRON BEAM BY COUPLED 
MODERATOR IN THE WORLD.
UNSCHEDULED SHUTDOWN DUE TO THE PROBLEM OF TARGET VESSEL.

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1. [Particle and Nuclear Physics Division] by Takeshi KOMATSUBARA
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HADRON EXPERIMENTAL FACILITY RESTARTED THE USER OPERATION

     Hadron Experimental Facility (HEF) restarted the user operation 
at 11:03 on 24th April, 2015. As a result, all of the facilities are 
normally operated in J-PARC.  After the accident on 23rd May, 2013, 
preventive measures against recurrence of similar accidents in both 
hardware and software aspects were implemented. Renovation works in 
HEF were completed in January 2015; they were reviewed by external 
expert panels and inspected by local governments, and the measures to 
prevent recurrence were reported to the governor of Ibaraki Prefecture 
and the mayor of Tokai village. Briefing sessions to explain to local 
residents were held on 3rd, 4th and 5th of April. The inspection under 
law was conducted, and the certificate was issued on 20th. 

     We would like to be grateful for your supports, and appreciate 
your patience during the two years. We are going to continue safety 
operation of the facilities, and expect excellent scientific outcomes 
by working with you closely.

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2. [Materials and Life Science Division] by Masatoshi FUTAKAWA
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500KW PROTON PULSE PRODUCES THE HIGHEST NEUTRON BEAM BY COUPLED 
MODERATOR IN THE WORLD 

     The beam power of the Materials and Life Science Experimental 
Facility (MLF) has reached at 500 kW, a half of our final goal of 1MW, 
at 11:00 on 15th April. Our coupled moderator has the highest 
efficiency to produce neutron beam in the world. Currently it has 
achieved the most intense neutron beam per one shot, which will be the 
world record. We had many encouraging messages about the great news 
from users to MLF.

 UNSCHEDULED SHUTDOWN DUE TO THE PROBLEM OF TARGET VESSEL

     Unfortunately, we have forced to stop the MLF user operation due 
to the problem on the target vessel since 30th April. We have been 
working to diagnose the source of the problem at the water cooling 
system in the target and we found that the best we can do is to 
replace the target now, which was originally scheduled in this summer. 
We are sorry for that we have to cancel the user operation of MLF for 
the period originally planned  before the summer shutdown. We 
sincerely apologize for any inconvenience this may have caused you and 
would deeply appreciate your understanding. 

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Editorial Board:
Toshifumi TSUKAMOTO (Chair): toshifumi.tsukamoto@kek.jp 
Kaoru SHIBATA: shibata.kaoru@ jaea.go.jp 
Takashi ITO: itou.takashi@jaea.go.jp 
Dick MISCHKE (English Editor): mischke@triumf.ca 
Junko BEANBLOSSOM (Secretary): beanblossom.junko@jaea.go.jp
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