Minutes of the 85th Machine-Time Committee Meeting
Date and time: February 25, 2015; 10:30–11:35
Place: RIBF Bldg., Room 203
Attendees: Sakai a (Chair), Abe a,Fukunishi a, Kamigaito a, Kase a, Kubo a, Miyatake c, Morimoto a, Okuno a,
Sakurai a, Shimoura b, Ueno a, Uesaka a, Uwamino a, Yamaguchi b, Imai d, †, Motobayashi a, †,K. Yoshida a, † ,Tanaka a, †, A. Yoshida a, †, Yonedaa,
Absent: En’yo a, † ,Wakasugi a, Haba a, †, Morita a, Kishimoto a, †a

RNC / b CNS / c KEK / d RIBF-UEC / † Observer(in random order)

Reports
1.

Current Status of the Machine Time Operation (Yoneda)
The current status of the machine time operation was reported. Following the last machine timecommittee meeting, the University of Tokyo student experiment, RI production, commissioning ofWacame, radiation biology experiment, and experiment of Y. Kobayashi with AVF standalone, werecarried out. The experiments with SRC/BigRIPS will start from late March.

2.

Members of RIBF Machine Time Committee (Sakai)
A report was made concerning the members of the RIBF machine time committee for the next fiscal year.
There were no changes made in the members. Professor Shimoura and Dr. Yamaguchi from CNS, andProfessor Miyatake from KEK will be asked again to serve as the RIBF machine time committee
members outside of the RIKEN Nishina Center. Dr. Otsu, Team Leader of the Nuclear Transmutation
Data Research Group Fast RI Data Team, will be an observer.

3.

Report on Machine Study（Fukunishi）
A report was made concerning the machine study of Wacame commissioning that was carried out onJanuary 24 and 25. The performance of the newly placed beam line delivering beams from IRC back to
E5 in the old part of RIBF was checked. This accelerator operation differs from the normal one. The
harmonics of RRC and IRC are 5 and 4, respectively, to achieve acceleration up to 160 MeV/u (normalones are 9 and 7 to achieve 127 MeV/u). The higher energy allows longer range in the irradiated sample,and longer region of constant LET. After tuning, it was confirmed that the beam line worked as designed.
The first use of this beam line for the machine time will take place in October.

4.

Status of PAC Meetings （Yoneda）
・ 16th NP-PAC:（12/3 – 5, tentative）
The meeting will be held for 3 days. Half of the PAC members will be replaced.
・ 11th ML-PAC：(1/8 – 1/9):
7 proposals that will use the RIBF old facility were approved. The breakdown is as follows: 2experiments of the AVF standalone (8 days), 2 experiments of the RILAC standalone (36 days), and 3

experiments of RRC (6 days). It is under consideration whether the next PAC will be held based on amail review system. The next PAC will be held in July.
・ 4th In-PAC：nothing has been finalized about the next PAC. A proposal of the same content as the one
previously approved was reviewed via mail.
Topics discussed
1. Approval of Minutes of Previous Meeting (Sakai)
2. Application of Machine Study
An application of machine study was reviewed. The application was approved, but it will be discussed
later again when the machine study will be carried out, as the status of the machine time operation in thesecond half of this fiscal year is still unclear.
・ Acceleration test of 4He with RILAC2+RRC for 211At production (Okuno)
An acceleration test of 4He with RILAC2+RRC will be carried out for the purpose of the 211At production.
A test with RILAC+CSM for the same purpose was already approved, with an attempt to find out
possibility of acceleration with another accelerator combination. The beam intensity is expected to be 100pµA. Two days in total are requested: one day with harmonics 9, and one day with harmonics 11. It is
desired to perform the test in autumn.
3. Machine Time Schedule of First Half of FY2015 （Sakai）
The machine time schedule of the first half of FY2015 was discussed. The SRC/BigRIPS experiments
will be performed from late March through the end of June, starting with the ImPACT experiment using
238

U. The radiation biology experiments will be carried out during the period of RIKEN’s Open Day andthen 238U will be provided again. During this break period, the experimental setup at F8 will be switchedto MINOS, to be ready for the SEASTAR experiment. The polarized deuteron experiment will follow, andduring this experiment the experimental setup will be switched again for the following four experiments
using 78Kr. After the commissioning experiment of Rare RI Ring is conducted with 78Kr, the rest will betentatively assigned for the new isotope experiment with 70Zn. The decision is pending concerning thisnew isotope experiment, and will be made after the budget situation becomes clear in spring. This plan
was approved after modifying the schedule of an AVF standalone experiment, which had been requested
not to coincide with the final stage of the SRC accelerator tuning.
4. Next Meetings
・The next meeting will be held on Wednesday, March 18, 2015, at 10:30.

・The schedule of the RIBF machine time committee meeting in the next fiscal year is as follows(basically on Tuesday, 15:00 -):April 28 (Tuesday) 15:00 - , May 26 (Tuesday) 15:00 - , June 16 (Tuesday) 15:00 - ,July 14 (Tuesday) 15:00 - , September 2 (Wednesday) 13:30 - , October 20 (Tuesday) 15:00 - ,November 17 (Tuesday) 15:00 - , December 15 (Tuesday) 15:00 - , January 19 (Tuesday) 15:00 - ,February 23 (Tuesday) 15:00 - , March 15 (Tuesday) 15:00 –