Ⅱ-8. Accelerator

RIKEN Accel. Prog. Rep. 51 (2018)

Transfer of GARIS-II and charge-state multiplier (CSM) cavities
Y. Watanabe,∗1 M. Kase,∗1 E. Ikezawa,∗1 N. Fukunishi,∗1 M. Fujimaki,∗1 O. Kamigaito,∗1 M. Komiyama,∗1K. Kumagai,∗1 T. Maie,∗1 K. Yamada,∗1 K. Suda,∗1 K. Ozeki,∗1 N. Sakamoto,∗1 A. Uchiyama,∗1 T. Watanabe,∗1H. Yamasawa,∗1 K. Morimoto,∗1 D. Kaji,∗1 K. Kaneko,∗2 M. Tamura,∗2 T. Ohki,∗2 K. Oyamada,∗2H. Yamauchi,∗2 A. Yusa,∗2 S. Fukuzawa,∗2 M. Hamanaka,∗2 S. Ishikawa,∗2 K. Kobayashi,∗2 R. Koyama,∗2T. Nakamura,∗2 M. Nishida,∗2 M. Nishimura,∗2 J. Shibata,∗2 N. Tsukiori,∗2 and K. Yadomi∗2An upgrade of the RILAC has been proceeding since
FY 2016 to date, as follows: (1) the construction of astage for the new 28 GHz SC-ECR and the installation of the 28 GHz SC-ECR, (2) the construction of a
hot laboratory for RI production, (3) the installationof a superconducting RILAC (sRILAC), and (4) the installation of a helium cooling system for the sRILAC.
The RILAC will have an upgrade, which involves replacing the four CSM cavities1) (A3 - A6) with three
superconducting cryomodules. Therefore, these CSM
cavities were transferred from the LINAC building in2017. GARIS-II2) (including a beam transfer (BT) line)
was also transferred from the LINAC building to theNishina building, to perform experiments with a highintensity Vanadium (V) beam and to continue experiments during construction. In this paper, we report on
the transfer of GARIS-II and the CSM cavities. During the transfer, there were three important points tobe considered. First, we had to perform the transferfor approximately four months, because of the beamtime, the extension and reconstruction of the LINAC
building, and some regular maintenances of the accelerator facilities. Second, we had to keep some temporarystorage places for GARIS-II and the CSM cavities, toarrange a period for carrying in. Third, we had to determine a transport route and a method to reverse thetop and bottom of the D1 dipole magnet (heaviest magnet, weight: 16 tons) of GARIS-II. This reversal was tochange the beam deﬂection of GARIS-II, because of theinterference with a shield door of the E6 room. Table 1
shows the transfer schedule of GARIS-II and the four
CSM cavities. A transfer schedule, a transport route,and some temporary storage places were planned byApril. In June, the magnets of GARIS-II were carried out from the LINAC building in the following order: Q2, Q3, Q1, D2, BT line, and D1 magnet. Some
radioactived chambers and the D1 magnet were temporarily placed in the radiation-controlled area (MB2ﬂoor in front of the SRC room) of the RIBF building,and the other magnets and BT line were placed in theD-crane area (the central machine hatch) of the RIBFbuilding. After GARIS-II was carried out, the two CSMcavities were carried out from the LINAC building inJuly, in the following order: CSM-A6 and A5. Couplers, tuners, cryopumps, turbo molecular pumps, andcooling water hoses were removed from the CSM cavities in advance. The vertical space in the transport∗1∗2

RIKEN Nishina Center
SHI Accelerator Service Ltd.

Table
1. Transfer schedule of GARIS-II and CSM in 2017.
  䠆routewas insuﬃcient because of an existing BT line䠆andthe low shield door. Therefore, the CSM cavities and its stages were carried out separately. Subsequently, the other two CSM cavities (CSM-A3 andA4) were also carried out with their accessories, ampliﬁers, and control panels from the LINAC building in
July. These four radioactive cavities and their accessories were temporarily placed on the MB2 ﬂoor, andsome ampliﬁers and control panels were placed in theD-crane area. Here, the D1 dipole magnet was reversedwith the C-crane (40 ton) in the BigRIPS room in July,and was divided into the upper yoke and lower yoke inorder to transfer it using a 10 ton-crane of the E6 room.
The transport route of GARIS-II was from the MB2
ﬂoor or the D-crane area to the E6 room, through themachine hatch of the Nishina building and the underground passage. Although the entrance of the E6 room
was narrow, the D1 dipole magnet was carefully transferred in July. GARIS-II was installed immediately onsome new stages over the D2 magnet of RIPS, and it
was checked for vacuum leak after alignment. The oldCSM-A6 cavity was used as the new D6-BEA (beamenergy adjuster) in the D room. The D6-BEA wastransferred from the MB2 ﬂoor to the D room, throughthe D-crane area and the side of the CNS building,in August, and was immediately installed between theQDD61 and QDD62 magnets. it was checked for vacuum leak after alignment. Then, the frequency of theD6-BEA was modiﬁed in September. Finally, the threeremaining CSM cavities were transferred from the MB2ﬂoor to the E21 room of the RIBF building, throughthe D-crane area and the north-machine hatch, in August, and were stored on the north side of the SCRIT
area. After the transfer, some infrastructure and theBT lines to these infrastucture were installed or modiﬁed. The operational checks of GARIS-II and D6-BEA
were conducted in December, and the ﬁrst beam timeof GARIS-II with the V beam commenced.

References
1) O. Kamigaito et al., Accel. Prog. Rep. 34, 322 (2001).
2) D. Kaji et al., Accel. Prog. Rep. 42, 179 (2009).

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