Ⅱ-8. Accelerator

RIKEN Accel. Prog. Rep. 49 (2016)

Control system renewal for eﬃcient operation of RIKEN 18 GHzelectron cyclotron resonance ion source†
A. Uchiyama,∗1 K. Ozeki,∗1 Y. Higurashi,∗1 M. Kidera,∗1 M. Komiyama,∗1 and T. Nakagawa∗1The RIKEN 18 GHz electron cyclotron resonanceion source (18 GHz ECRIS)1) is used as an external
ion source at the RIBF accelerator complex to produce
an intense beam of medium-mass heavy ions. In theRIBF control system, Experimental Physics and Industrial Control System (EPICS) is adapted in orderto integrate controllers for operation of power suppliesof the magnet, vacuum systems, beam diagnostic system, etc.2) However, a non-EPICS-based system has
hardwired controllers, and it is used in the 18 GHzECRIS control system as an independent system. For
this reason, an unintegrated control system between
the ECRIS and the RIBF accelerator complex causes
ineﬃcient cross-operation. For eﬃcient operation of
the 18 GHz ECRIS, the control system should be upgraded by a remote control system with EPICS.
Rapid development of the renewal method is necessary because the 18 GHz ECRIS is used for both
RIBF injection and standalone experiments at the RILAC. Therefore, we use the 28 GHz SC-ECRIS control system technology3) for constructing the 18 GHzECRIS control system. The control system features
are used to adapt the programmable logic controllers(PLCs) to embedded EPICS technology and constructsuperior client systems. The 18 GHz ECRIS control system includes several types of distributed systems for remote control and Ethernet services. Forcontrol of the main devices (e.g., gas valves, 18 GHzECRIS rod position), a Yokogawa F3RP61-2L module, which acts as an EPICS input/output controller(IOC), is combined with FA-M3 PLCs.4) A beam diagnostic system (e.g., Faraday cup, beam proﬁle monitor) is constructed with the EPICS using Linux-basedIOCs connected with N-DIMs, which are the original
Ethernet-based control devices at the RIKEN Nishina
Center.5) The negatively biased disk and the oven system are placed in the high-voltage terminal. For components installed at the locations, it is necessary toprovide insulation between the controller and components. Consequently, an FA LINK (proprietary speciﬁcation, Yokogawa Electric Corporation) and opticalﬁbers are adopted for connection with the high-voltage
stage (See Fig. 1).
For the software, basic components, such as a dataarchiver, and a GUI-based operator interface, are implemented as well as RIBF control system. The operational log system6) is also adopted for the 18 GHzECRIS control system. By completely logging 18 GHz†∗1ECRIS operations, for example gas valve and rod position operations, the operational logs can support thegeneration of ion beams, because the logged data canbe used to develop an ion beam.
The 18 GHz ECRIS system can be operated without
serious problems. Especially, we successfully achieved
stable 48 Ca beams7)8) in 2015 using this renewal control system, because a more sensitive operation, forexample ﬁne tuning of the MIVOC9) temperature andmicro-oven10) voltage, is possible, which was not thecase with the old hardwired control system.

Fig. 1. Outline of the hardware for this renewal system.

References
1) T. Nakagawa et al., Nucl. Instrum. Meth. B 226, 392(2004).
2) M. Komiyama et al.: Proc. ICALEPCS14, SanFrancisco, CA, USA (2014), p.348.
3) M. Komiyama et al.: Proc. ICALEPCS09, Kobe, Japan,(2009), p.275.
4) A. Uchiyama et al.: Proc. PCaPAC08, (2008), p.145.
5) M. Fujimaki et al., RIKEN Accel. Prog. Rep. 37, 279(2004).
6) A. Uchiyama et al., RIKEN Accel. Prog. Rep. 48, 195(2015).
7) M. Nishida et al.,in this report.
8) E. Ikezawa et al., in this report.
9) M. Kidera et al., Rev. Sci. Instrum. 75, 1473 (2004).
10) K. Ozeki et al., Rev. Sci. Instrum. 85, 02A924 (2014).

Condensed from the article in Rev. Sci. Instrum. 87, 02A722(2016)RIKEN Nishina Center- 148 -