Ⅱ-8. Accelerator

RIKEN Accel. Prog. Rep. 49 (2016)

Installationfor dipole
dipoleandandquadrupole
quadrupole
Installationof
ofchangeoverchangeover switches
switches forbeam transporttransport linelinemagnetmagnetonon aa newnew beam
K. Kumagai *1 and N. Fukunishi *1
A new beam transport line dedicated to provide
high-energy beams for biological experiments wasconstructed in the last year1), 2). Beam commissioning of thebeam line was carried out from January 24th to 25th in 2015.
A 160MeV/u 40Ar beam was transported from a beam
exiting point of IRC to the confluent point connected to theexisting beam line within 30 min. After the beamcommissioning succeeded, an Ar beam was transported to
the E5 experimental vault and beam irradiation to seaweedsamples was carried out promptly.
One-third of dipole magnets and two-thirds of quadruple
magnets on the new beam transport line were operated withexisting power supplies by switching or changing thepolarity of the magnet. At the time of commissioning, theswitching of the magnets and/or their polarity wasperformed manually. The switching of all magnets took
several hours. Because it was assumed that the frequency inuse of the beam line becomes larger by having succeeded in
the beam commissioning, we decided to install powersource changeover switches to switch magnets and/or theirpolarity automatically using buttons.
Table 1 summarizes the scheme of the switching for thedipole magnets and Table 2 shows that for the quadrupole
magnets. The automatic transfer switch type SSK-C
produced by KYORITSU KEIKI CO., LTD. was used toswitch dipole magnets, and type SSK-E was used to switch
quadrupole magnets. Both switches have the functions of
instantaneous excitation and mechanical holding. In thecase of quadrupole magnets, two families of circuits can beswitched using one switch. In the case of resistive load,these switches were designed such that switching was
possible in the state in which an electric direct current
spread in, but the inductance of the magnet might damage
the contacts of switches. We designed the switches suchthat they are not able to switch when an electric current
flows. In addition, they were not able to switch when thecurrent sensing device broke down. An electric current
passing through the circuit was detected by the current
sensing device using a shunt resistor. It is designed suchthat a switch becomes effective when the electric current isless than approximately 1.6 mA for a dipole magnet and 3
Table 1. Scheme of switching for dipole magnets.
ChannelPowersupplySpecification

New beamline1

BT_D10_4

330A-60V

DMR3DMK9 a)2

BT_D10_3

330A-85V

DMR4



DMH8 a)3

BT_D8_2

330A-155V

DMR5



DMH7 a)a)＊1

IRC bypass
beam ine

mA for a quadrupole magnet.
The interlock signals of overheat and the coolant stop ofboth magnets are equipped in the power supply, but thesignals originating from a magnet that is not connected areunnecessary. Therefore, the interlock was designed to bemasked using the auxiliary contacts of the switching device.
Table 2. Scheme of switching for quadrupole magnets.
Powersupply

New beamline

BT_QB4_1
BT_QB4_2
BT_QB4_4
BT_QB4_5
BT_QA5_1
BT_QA5_2
BT_QA5_3
BT_QA5_4
BT_QA5_5
BT_QA5_6
BT_QB4_6

QDR63aQDR63bQDR64aQDR64b
QTR72b
QTR72c
QDR71a
QDR71b
QSR73QSR74
QTR72aBT_QB1_1 c)

QDR31c

BT_QB1_2c)

QDR31b

BT_QB1_3c)

QDR31aChannel
12345678910111213

QDG21aQDG21bQSG23QSG24QDG26aQDG26bQDG41aQDG41bQDG51aQDG51bQSG25
QTH81a a)

QTH81b a)
QTH81c a)

BT_QB5_1

QSH17 b)

BT_QC2_2
BT_QC2_3
BT_QC2_4
BT_QC2_5
BT_QC1_2
BT_QC2_1

QDR61aQDR61b
QDR62aQDR62b
QDR01aQDR01b

BT_QA6_5 c)

QSR11

IRC bypass
beam lineInjection beamline to SRCQDG11aQDG11bQDG12aQDG12bQDK02aQDK02b

QSH61
QTG92aQTG92c
QDG93aQDG93b

QTG92ba)

Polarity Changeb)
On the injection beamline to IRCc)
Specification of these power supplies is 150A-40V and that of the rest
of the power supplies is 150A-30V.

The switches were manufactured from June to August. In
September, installation, wiring and a check of wiring andmagnet polarity were carried out. The first irradiation afterinstalling the switches was carried out from 5th to 7thOctober and was finished satisfactorily. The next irradiationis scheduled for 27th to 29th January, 2016.
References
1) K. Kumagai et al., RIKEN Accel. Prog. Rep. 48, 189 (2015).
2) Y. Watanabe et al., RIKEN Accel. Prog. Rep. 48, 19 (2015).

Polarity Change
RIKEN Nishina Center- 136 -