RIBF User Group
Town Meeting2024/03/18@onlineAgenda• 1) Report on the RIBF UEC activity (Ichikawa)• 2) Report from Nishina Center (Yoneda-san)• 3) OthersReport onthe RIBF UEC activity
Yuichi Ichikawa
For the RIBF Users Executive Committee

Current members of UEC
Apr. 2021 - Mar. 2025
Y. Ichikawa (Kyushu, chair until March)
T. Abe (Keio, vice chair)
A. Corsi (CEA Saclay)
J. Zenihiro (Kyoto)
K. Sekizawa (Tokyo Tech.)Apr. 2023 - Mar. 2027
K. Miki (Tohoku, vice chair and new chair)
D. Nishimura (Tokyo CIty)
P. Schury (KEK)
F. Minato (Kyushu)
H. Liang (Tokyo)

UEC activities• Regular town/online meetings• Report from the MT committee (monthly)• RIBF Users Group Thesis Awards• RIBF Users Meeting• Member list update• Conference calendar update (regularly)• Bridging users and RNC

Request to Nishina Center / RIBF
 Originally UEC was established to bridge the RIBF
users and Nishina Center.
 Requests to Nishina Center were surveyed.

Stats of Surveys• Period: 27 days (from Feb. 6 to Mar. 3)• Number of votes: 14 (7 Japanese + 7 Others)• Topics:
1. Technical requests(such as shared facilities and equipment)
2. Demands or concerns about conducting experiments(including machine time, PAC coordination, and timing)
3. Requests related to collaboration
4. Requests to RIBF Users Meeting (such as timing, and joint
hosting with collaboration meeting)
5. Suggestions to RNC for further promoting theoretical research
6. Other requests

Answers as voted are exhibited in
the town meeting, and omitted inthis uploaded file.
After summarizing the opinions, wewill submit the request to RNC

Member list update
Non-active members (over 600) will be deleted
Please update your registration• Visit https://ribfuser.riken.jp/RIBF_UG/registration.html• Click on “Update User Info.”• Enter your email address, click on “送信/submit”• Update your information if necessary• Irrespective of the update click on “送信/submit”

Please check emails to be send in April• Check / update• Otherwise deleted

RIBF Status ReportKen-ichiro YONEDA
User Liaison GroupRIKEN Nishina Center
RIBF User Group Town Meeting
On-line meeting, March 18, 2024• RIBF operation in 2nd half FY2023• Recovery from hardware troubles• MT plan in 1st half FY2024• NP-PAC meeting

RIBF operation October – December ’23
https://www.nishina.riken.jp/rarfmt/pc.html
December

OctoberNovember

Only low-energy experiments
without SRC

RIBF operation January – March ’24
https://www.nishina.riken.jp/rarfmt/pc.html
FebruaryJanuary

New trouble !!
in RRCMarchNow

Hardware trouble 1 – RRC vacuum
RRC付近真空度トレンドグラフ

RRC共振器 真空漏れ(2024/01/19 21:48)•有償利用マシンタイム実施中の1月19日の日中より真空度悪化が進行していたが、21時以降になると共振器真空度がインターロック閾値を超える様になり、改善の見込みのないことから22:37にマシンタイムを中断。

•ウランビーム加速用の18.25 MHz領域の加速電圧向上を目指したRRC共振器
改造後は、改造した共振器ステムより水漏れがしばしば発生し、今回もこの事象を疑ったが、1月21日に実施した上下ステム10系統の冷却水水抜き実施
後も真空度は改善せず。

•本故障とは無関係に予定されていた製造メーカー(SHI)によるRRC共振器メンテナンス(上記改造ステムの補修を目的におよそ1回/年の頻度にて実施されている)実施時に共振器内部を点検したところ、共振器ムーバブルボックス上側ロッド下のフランジよりリークを確認した(1月31日)。

•治具等の準備が整った2/7 - 2/9にて修理を実施、傷んでいたメタルOリングをゴムOリングに交換して修理完了。その後共振器を運転位置に戻して真空引き、RFコンディショニング等を実施し、2/18の有償利用MTから運転を再開した。

•RRC運転停止期間：約4週間

24時間Hardware trouble 1 – RRC vacuum
RRC共振器#1内部(上半分)
Rod(Cu)フランジ接続(金属Oリング)

Stem

拡大Movable BOX

底面

加速用電極

緩んでいたボルト

上Rod側

下フランジ側漏れがあったメタルOリング
これをゴムOリングに交換して復旧

Hardware trouble 2 – SRC extraction channel
Before repair …

Hardware trouble 2 – SRC extraction channel
After repair …

Hardware trouble 2 – SRC extraction channel
Baffles updated
entranceexit

Hardware trouble 3 – SRC He tube
SRC sub-transfer tube

before repair

after repair

Hardware trouble 3 – SRC He tube

MT schedule in 1st half FY2024
https://www.nishina.riken.jp/rarfmt/pc.html

AprilJune

18O

SAMURAI

gamma
124Xe

Maydecay
TPC

IDATENOEDO
reaction c.s.
70Zn
“TRIP”

MT schedule in 1st half FY2024
https://www.nishina.riken.jp/rarfmt/pc.html

July

September

Only low-energy experiments

FY2024 yearly plan
136Xe?

• try to achieve 5-month operation• in autumn 2 months from mid-October• Call for beam time scheduling request … in June(days)

SRC operation time
3.11 Earthquake160

3 months
operationRRC RF
updateFY2020Spring cancelled

140

FY2022-3
Hardware troubles

120100SRC-BigRIPS
operation time increase80

SRC-BigRIPS exps
backlog to decrease
butRRC old-facility
operation time decreaseabout 6 months
 5 months

60
40
200
Total (Data run + MS + Tuning)

PAC-approved experiments

NP-PACnext 25th NP-PAC meeting
meeting schedule not fixed yet (in December?)proposal submission deadline in September?
still under discussion
Call for Proposals to be issued in June
Latest information will be given in:
https://www.nishina.riken.jp/RIBF/NP-PAC/index.html