Ⅱ-8. Accelerator

RIKEN Accel. Prog. Rep. 50 (2017)

Operation report 2016 for Nishina and RIBF water-cooling systems
T. Maie,*1 K. Kusaka,*1 M. Ohtake,*1 Y. Watanabe,*1 E. Ikezawa,*1 M. Kase,*1M. Oshima,*2 H. Hirai,*2 K. Kobayashi,*3 and J. Shibata*3
Operation condition
In FY2016, the Nishina and RIBF water-coolingsystems were operated for six and five months, respectively.
These operation periods correspond to the scheduled beamservice time of RIBF, i.e., five months. In addition,
Nishina’s water-cooling system was used not only for full
RIBF operation but also for the AVF standalone andAVF+RRC operations. During FY2016, there was no
significant problem that resulted in beam service
interruption for both Nishina and RIBF water-coolingsystems. However, they were affected by minor problems.
Trouble report
Fortunately, we were not affected by the big trouble thatcanceled an experiment, but a water leak and cooling-water
pump trouble occurred from a coupling and a connection
part of the cooling plumbing. In addition, we encountered amovement defectiveness of the control valve which wasdamaged by radiation during the operation of theaccelerator, and a trouble in the inverter for cooling-water
pumps due to deterioration with, age accelerator driving
depended on got up.
Periodic maintenanceRoutine maintenance works listed below were
performed during the scheduled summer and wintermaintenance periods of the RIBF accelerators.
1) Cleaning of the cooling towers
2) Inspection and overhauling of the cooling-water pumps
3) Touch panel exchange for RIBF cooling system control
4) Inspection of the inverter of the RIBF water-coolingpumps
5) Inspection and overhauling of the air compressor6) Replacement of some superannuated hoses, joints andvalves used in the system
7) Cleaning of the strainers and filters used in thedeionized water production system
8) Extension of the sensing wires of the water leakage
alarm to floors of new areas

Establishment and improvememt
With the cooling facilities, we performed coolant
pipelaying for K1 electromagnets in additionto an theupdate of the absorption-style refrigerator, the transference
construction of the turbo system in the refrigerator this year.
A high strength would improve the ability to cool theFaraday cup G01 which is a future plan, and RILAC
upgrade plans the laying construction of cooling facilities
for setting of cooling facilities for Helium refrigerator
facilities for becoming it, GARIS2 to transfer.

Fig. 1. Photograph of the touch panel exchange for control.

Fig. 2. Photograph of the inspection of the control system ofthe RIBF water-cooling system.

References
1) K.Ozeki et al., RIKEN Accel. Prog. Rep. 49 (2015) pp139.
2) T. Maie et al., RIKEN Accel. Prog. Rep. 49 (2015) pp143.
3) T. Maie et al., RIKEN Accel. Prog. Rep. 48(2014) pp197.

As usual, 2-3 times go the work that pro-backup,changes electricity and a cooling installation in a year
during an accelerator outage to be affected by coolingfacilities than a stop of steam and the cold water by rolling
blackouts of RIKEN inside and a periodic inspection of theco-generation in the Nishina Center.

*1

RIKEN Nishina Center
Nippon Kucho Service Co., Ltd*3
SHI Accelerator Service Co., Ltd*2- 155 -