CONTROL SYSTEM FOR BOOSTERSYNCHROTRON UTILIZATION FACILITY
Y. Irie, K. Ishii, S. Ninomiya, H. Ishimaru, S. Hiramatsu
Z. Igarashi, E. Kadokura, T. Adachi, I. Sakai and H. Sasaki
National Laboratory for High Energy Physics
Booster Synchrotron Utilization Facility (BSF) has begun
work since July 18 of this year. The control system for the BSF
is almost completed. In this report the present status of thecontrol system is briefly described.·
Fig. 1 shows the schematic diagram of the hardware interconnections . The system consists of three divisions: (A) interactions with the PS central control room (CCR), (B) those withexperimenta l facilities and (C) the BSF internal control system.
Interactions with the central control room
Timing clocks and beam-gate signal are transmitted from theCCR. Timing clocks are used for synchronizin g pulsed operating
devices to the booster cycle. Triggering a pulsed switchingmagnet, acquiring beam profile data, rotating a neutron chopperetc. should be in synchroniza tion. Beam-gate is the gate pulseof about 1.9 sec. width which corresponds to an excess of thebooster beam ov~! the m~in r-in~ injection._ In this ga:t_e w-e canchoose the booster beam in any form of a pulse sequence according
to the beam requests from users. The selected beam gate signal(arc-gate) is sent to the CCR and fed into the arc-triggeri ng
system. Timing relation among these signals is shown in Fig. 2.
"BSF ready" and emergency signals from the BSF interlock the CCR
beam switch.
(A)

Interactions with experimenta l facilities
Beam request, trouble signals and any other informations are·sent from the experimenta l areas. The beam request status isREADY/PRESET/PAUSE/REJECT and each facility sends one of theserequests to the BSF control room. A programmabl e sequence control.,ler (5TI sequencer) decides the beam delivery mode to the experimental areas following their requests. After checking all conditions for beam injection, the sequencer sends "BSF ready" signal
to the BSF control desk and the CCR. Trouble signals directlyinterlock the beam switch by hardwiring (relay-logic ). Informations of experimenta l facilities are t9-ken by a mini--comput er(MELCOM 70/25, hereafter M-70) and displayed on a color character
CRT terminal (80 x 25 charatters) . Clocks and trigger pulses are
distributed to each facility.
(B)

BSF internal control system
Internal control system includes the beam line control,
access control and personnel protection system. ON/OFF and UP/DOWN control of the magnet power supplies are executed by theM-70. Beam profile data along the bea~ line are also taken by
M-70 and displayed on a graphic terminal (1024 x 780 points).
Beam current monitor output is fed into a sample/hold module andintegrated by ADC and counter circuits. The M-70 takes these
integrated values by an external synchronizin g signal and displayson the CRT or the control desk in units of protons per pulse orcounts per second.
Beam lines, experimenta l areas and transfer tunnels,are all
(C)

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----~----~----

radiation controlled areas. All doors of those areas are electrically locked. Access to those areas is possible after releasing
the electric lock by a key and under TV surveillance from thecontrol room. When a personal key is removed from a key board,
it is impossible to turn on the beam switch and the relevant
magnet power supplies. The radioactive contamination of wholehuman body surface or equipments is checked by a gate monitor
which is located at the entry gate to the primary beam line.
Operational record or access and contamination record areaccumulated in a disc file of the M-70 and these data can be always
read out and printed out in an arranged form.

lBSF INTERNAL CONTROL SYSTBMCENTRAL CONTROLROOMBEAM SIGNAL - f - - - - - - - - - - i

GJ------+-- CLOCK.BEAM-GATE
ARC-GATE
CLOCK.GATETRIGGER PULSE
r-----f---~CATV~~-t----------~CCTV

Fig. 1

Simplified schematic diagram to show the hardware interconnections••90K"h..____n_BEAM-GATE

NEUTRON LABREQUESTMESON LABREQUEST----~r-1~------~r-t~----MEDICAL USE-------ln.______n..._REQUEST
ARC-GATE

Fig. 2 Timing relation among beam-gate,
requests and arc-gate signals--144-