July 17, 2024

Call for Beam-Time Scheduling Requests
Hideki Ueno
MT Committee Chair
RIKEN Nishina Center
for Accelerator-Based Science

We are now calling for beam-time (BT) scheduling requests for the experiments approved byPAC (Program Advisory Committee), that will be ready to run from April 2024 to the middle ofMarch 2025. As for the operation plan during this period, please refer to the “operationschedule” attached to this announcement.
Representatives who have experiments approved by PAC are eligible to submit beam-timescheduling requests. Please fill out the “Beam-Time Request Table,” and upload your file to:https://riken-share.ent.box.com/f/a52b4f6c4d3a44459f0b542a3275fe7b
The submission deadline is 5:00PM (JST), July 31 (Wed.), 2024. Please note that only thesubmission of the “Beam-Time Request Table” is needed in this step. The file in the latest
format can be downloaded at:
http://www.nishina.riken.jp/RIBF/procedure/index.html#BTReq .
If you have questions which are not answered on our FAQ web site:
http://www.nishina.riken.jp/RIBF/procedure/faq.html ,please contact us: UserSupportOffice@ribf.riken.jp .

Process of the beam-time schedulingAfter receiving “Beam-Time Request Table,” we will make a BT schedule plan in earlyAugust. The following week will be used for trimming and finalizing the BT schedule. Comments
and further requests to the RIBF Users Office are welcome during this week. Please note thatbeam-time allocation depends on the priority of the PAC recommendations, accelerator status andother constraints.
Once your experiment is scheduled, RIBF Users Office requests you to submit the“Accelerator-Use Planning Sheet.” The safety aspects of your experiment are reviewed based

on the submitted “Accelerator-Use Planning Sheet” by the in-house Safety Review Committee,the Radiation Safety Liaison Officer and the Radiation Protection Supervision of RIKEN. You
should respond immediately when any concerns regarding safety issues are notified by thein-house Safety Review Committee through RIBF Users Office. If RIBF Users Office does notreceive any response, your beam-time request will be automatically CANCELED. Details of thenecessary procedures will be announced to the representatives whose BTs are scheduled.

The operation schedule from October 2024 to March 2025
The figure below is a tentative operation plan from October 2024 to March 2025. Please notethat this plan is still subject to change when a new situation appears. Please be ready for a suddenchange of the schedule.
SRC/BigRIPS-based facility:
We plan to resume the SRC/BigRIPS operation in the middle of October, after the power
outage scheduled on October 12. The operation will last until the beginning of December. The
first beam species is 136Xe. The next beam species is not fixed yet. The possible candidate is 238U,but we welcome requests with other beam species to seek for an efficient beam time schedule.
The operation in March 2025 is still optional, and the call for the next spring will be issued inlate December or early January.
AVF/RILAC/RRC-based facility (lower energy):
The RRC will be available when SRC/BigRIPS experiments are not scheduled. The AVF
standalone is, in principle, available anytime except when the AVF is used for SRC/BigRIPS
and RRC experiments. The AVF and RRC will be occupied in early October by the Nishina
Center mission experiments.
The operation of the RILAC will be concentrated on the Nishina Center mission experiments.
It is not likely that PAC-approved academic experiments can run in this period.