Ⅴ. EVENTSRIKEN Accel. Prog. Rep. 56 (2023)
RIKEN
Accel. Prog. Rep. 56 (2023)

RIKEN open day 2022
T. Ikeda,∗1 Y. Watanabe,∗1 N. Miyauchi,∗1 Y. Hayashi,∗1 and T. Abe∗1RIKEN open day, on which its research activities areshowcased to the public, was held in the RIKEN Wako
campus on Saturday, April 23, 2022 in a hybrid style.
Employing an advance reservation system, it was theﬁrst attempt to invite visitors to the campus under thespread of COVID-19. The number of the visitors waslimited to 300 for each morning and afternoon slot.
The number of applications was 766 and 795, respectively, for the two slots and those of the visitors onsite was 208 and 198, respectively. All visitors weresupposed to spend their time in the Administrative
Headquarters (AH) bldg. in the campus, except when
taking group tours to a few selected research centers.
The contents of the activities from Nishina Center
were (1) group tours for Cyclopedia and RIBF (Fig. 1),(2) exhibition of a large photo panel of the Superconducting Ring Cyclotron (SRC) at the AH bldg. aswell as a poster presentation (Fig. 2), and (3) an online laboratory tour with a navigator to the Nishina
accelerators using RIBF-VR360 (Fig. 3(a)).1) Online
movies made before 2022 were also available. Thesecontents included collaborations with the Center for
Nuclear Study (CNS) at University of Tokyo and theWako Nuclear Science Center (WNSC), IPNS, KEK.
A tin-badge event was held at the AH bldg., in which
visitors could make badges by themselves. The badges
related to the Nishina Center, as shown in Fig. 3(b),were well-received by the participants. The details ofthe various activities are in Figs. 1 and 2.

Fig. 2. A large photo panel of SRC displayed as a photogenic place at the Administrative Headquarters bldg.

Fig. 3. (a-1) Online tour using RIBF-VR360 with a navigator for interactive communication. (a-2) the title page(b) three badges marked with yellow circles were designed by Nishina Center. The ﬂowering plant in (i) is
the “Nishina Otome” cherry blossom produced in thiscenter. The symbol “Nh” in (ii) and (iii) stands for theelement Nihonium, that was synthesized in the centerfor the ﬁrst time in the world.

Fig. 1. Group tour to the Nishina Center RIBF bldg., including an explanation session at Cyclopedia followedby visits to SRC and BigRIPS.

For COVID-19 infection control, the group tours tothe Nishina RIBF bldg. were designed carefully. The∗1RIKEN Nishina Center- 218 -tours titled “Everything you want to know about stateof-the-art accelerator is right here! ” were held twicein the morning and also twice in the afternoon. The
tour attendance was limited to 12 visitors, who wereescorted by RIKEN staﬀ members between the AHbldg. and the RIBF bldg., so that each group tour ﬁnished within an hour. The participants were welcomedat Cyclopedia for an explanation by the Nishina staﬀ
instructors, and then enjoyed the views of SRC and BigRIPS from the MB2 ﬂoor with guidance by the otherinstructors. At the end of the tour, they got RIBF
souvenirs and left with the RIKEN staﬀ members.
In the AH bldg., a booth with the title “A huge ac-Ⅴ. EVENTSRIKEN Accel. Prog. Rep. 56 (2023)

celerator facility where elements are freely created likemagic” was opened, where a 2.5-m high photo panel of
SRC (Fig. 2), large enough for visitors to take photos
as if they were at the SRC site, was on display. Nearby,
several posters introducing the entire Nishina Center
were displayed, where two Nishina staﬀ members wereassigned to provide explanation.
The online laboratory tour titled “RI Beam Factory: A reclining dragon-like huge underground accelerator complex ” using the RIBF-VR360 was carriedout through a zoom meeting system, where ion sources,RILAC, RRC, fRC, IRC, and SRC were introduced bya navigator (Fig. 3(a-1)). The virtual tour achieved
111 net views, which was the highest number among
the four virtual tours, including the other centers.
The RIKEN open day 2023 is scheduled on October
14, 2023, which is the ﬁrst trial of the autumn season.
Reference1) RIBF-VR360 (in Japanese):
ribf/ .

2https://vr.riken.jp/- 219 -