RIBF User Group Town Meeting
September 10, 2020
Online(Zoom)• 1) Report on the RIBF User Group activity (Hinohara)• 2) Report from Nishina Center (Yoneda-san)• 3) OthersReport onthe RIBF User Group activity
Nobuo Hinohara
for the RIBF Users Executive Committee

Current member list of UEC
Apr. 2017 - Mar. 2021
- K. Wimmer, CSIC, vice-chair- S. Sakaguchi, Kyushu- Y. Watanabe, KEK- W. Horiuchi, Hokkaido- T. Matsumoto, Kyushu• Apr. 2019 - Mar. 2023
- D. Suzuki, RIKEN, vice-chair- H. Crawford, LBNL
- S. Nishimura, RIKEN- N. Hinohara, Tsukuba, chair- N. Shimizu, CNS• Supplementary members Apr. 2019 - Mar. 2021
- S. Paschalis, York- K. Miki, Tohoku• Next elections spring 2021

UEC Activities• Regular town meeting at the JPS meetings→ Town meeting canceled in March 2020 (JPSmeeting canceled)→ Town meeting held online in September 2020

• Report from the MT committee (monthly)• RIBF Users Group Thesis Award, together withRNC• RIBF Users Meeting 2020 (online)

RIBF User Group Thesis Award 2020
Dr. Nancy Paul (Kastler–Brossel Laboratory)
for her Ph.D. thesis “First spectroscopy of 110Zr with MINOS”(Paris-Saclay University, 2018)• co-sponsored by RIBF UEC and RIKEN Nishina Center• Selection Committee Members
H. Crawford(co-Chair), N. Hinohara, W. Horiuchi, T. Matsumoto, K. Miki, S. Nishimura,
S. Paschalis, S. Sakaguchi, N. Shimizu(co-Chair), D. Suzuki, Y. Watanabe, K. Wimmer• Eligibility: Ph.D. theses from March 31, 2017 to present.
• Applications due on May 24, 2020. Result released on July 15, 2020.

RIBF Users Meeting 2020
• Chaired by N. Hinohara and organized by S. Nishimura• Online (Zoom)• 17 invited talks:– 1 facility talk + 13 experimental talks + 1 thesis award– 2 theory talks• Participants : 127– 1 Canada, 4 China, 8 France, 4 Germany, 1 Hong Kong, 2 Italy,– 88 Japan, 7 South Korea, 1 Romania, 2 Spain, 6 UK, 3 USA• Account balance: 26,016 JPY from last year
(no cost for coffee break/name tags/dinner this time)

Amendment to RIBF UEC Charter
Current RIBF UEC Charter:
https://ribfuser.riken.jp/RIBF_UG/charter.html• Update the provisions on the membership of UEC so that
UEC properly represents RIBF User Group• Define provisions on resignations of UEC
members/officers, and on amendments to Charter.

Updated provisions on UEC membership• Chair should be no member of RNC (RIKEN Nishina Center)[*]• Only one RNC employee can be elected in a UEC election. Among a total of 10
UEC members, maximum 2 members come from RNC.
• Chair or a Vice Chair should be theorist, unless special circumstances.
These provisons are intended to ensure the independence of UEC and the variety in UEC members.

•Maximum two supplementary members are nominated by the UEC Chair.
There is currenlty no provision on the number of supplementary members.

•New officer ‘Observer’. At least one observer from RNC. Additional observers
can be nominated if necessary. The term is one year. Observers are invited toattend the meetings of UEC.
New ‘observer’ unifies the responsibilities currently split over two different observing
officers ‘RIKEN Liaison’ and ‘Ex-officio’. The current officers will be discontinued.

[*] RIKEN employee are defined as a person whose primary affiliation is RIKEN Nishina Center. Those who having avisiting status or affiliating primarily with another institute via cross-appointment are not included.

When a UEC member or officer left•
•
•
•
•
•

When a UEC member left. UEC Chair nominates the unelected candidate whocollected the most votes in the previous election to fill the vacancy or leaves theposition open until the next election.
When UEC Chair left. UEC nominates another UEC member.
When Vice Chair left. UEC Chair nominates another UEC member.
When a supplementary member left. UEC Chair nominates another RIBF User
Group member or closes the position.
When an observer left. UEC Chair nominates a replacing officer or closes theposition (if another observer from RNC is present in the office).
In all cases above, the replacing member or officer will serve for the remainderof the term of the predecessor.
Provisions regarding the resignation of UEC members or officers are not given in thecurrent Charter.

Amendment to Charter• UEC prepares the draft Charter.
• UEC communicates the draft Charter to the RIBF User Group in a town
meeting and/or by e-mail.
• UEC collects feedbacks from the RIBF User Group during a defined period oftime (nominally 2 weeks).
• UEC prepares an updated draft if necessary. UEC communicates the updated
draft to the RIBF User Group to repeat the process.
• UEC enacts the draft Charter once all feedbacks from the RIBF User Group
were addressed. UEC announces the new Charter to the RIBF User Group.
The point is that no voting process is involved to amend the Charter.

This time, UEC will prepare the draft after this town meeting. The draft willbe circulated to the RIBF User Group by the end of the year.

RIBF Status ReportKen-ichiro YONEDA
User Liaison GroupRIKEN Nishina Center
RIBF User Group Towm Meeting
Web Meeting, 10 September, 2020• Announcement on Nishina Center Organization• RIBF operation under COVID-19 effect• Trouble of RRC RF Cavities• next NP-PAC meetingAnnouncement on Nishina Center Organization

Prof. H. Sakurai
New Director ofNishina Center
Accelerator Progress Report 2019 Vol.53
to be released soon

From 2006: Dr. Y. Yano 1st Director
From 2009: Dr. H. Enyo 2nd Director

From 2020: Prof. H.Sakurai 3rd Director

RIBF operation under COVID-19 effect
S-RILACbeam delivery startedAprilJune★
Level 2★
CampusLock OutMay

★

July

AVF restart★
Level 4★
RRCbreakdown★
Level 3RRCrestart・ Level 1 from early September・ (almost) regular operation
including SRC-BigRIPS

RRC RF update … Reported in March 2018
picture by K.Yamada

・ old cooling water pipe à renewed
・ Frequency coverage 20-45MHz à 16-38.7MHz
V acceleration 18.25 MHz to be in the range（U acceleration also 18.25 MHz）

RRC Cavities update（March 2018）→Stem&Dee renewed
Movable box

StemDeeStem

HV achieved
150 kV@ 18.25 MHz↓U:
94 pnAXe:

173 pnA

Movable box

K. Yamada et al., RIKEN APR vol. 52

Discharge before update
100Times / Day / Day
Breakdowns

9080702017#1 @ 86 kV#2 @ 82 kV

60
50
4030
20
10051015

202530Days

Days

35404550

Discharge after update → much improved
100Times / Day / Day
Breakdowns

9080702018#1 @ 117 kV#2 @ 114 kV

60
5040302010051015202530
Days

Days

35404550

2019年：33箇所
2020年：9箇所

2019年：48箇所
2020年：61箇所

next NP-PAC

21st NP-PAC meeting
to be held on December 14 (Mon) – 16 (Wed)
Proposal submission deadline isOctober 19 (absolute)
4-year expiration à 4.5 years for this timeTotal beam time for BigRIPS experiments
3.11 Earthquake160

3 months
operation

RRC RFupgrade140
120- facility
obsolescence- budgetrestriction

100
80
60
40
20

Total (Data run + MS + Tuning)
PAC-approved experiments

02007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019

Summary• Next NP-PAC meeting on Dec 14-16
proposal submission till Oct 19• Research environment getting recovered• Potential Problem of RRC RF Cavity