Abstracts Brochure - CERN

THPCH — Poster Session 29-Jun-06 16:00 - 18:00
Continuous Circumference Control and Timing System for Simultaneous Electron-positron
Injection at the KEKB
We have continuously controlled ring circumference
with a new method of synthe- M. Suetake, H. Koiso, Y. Ohnishi, K. Oide (KEK)
sizer control at the KEKB. The new method
stands for continuous controlling of reference frequency of synthesizers. Due to the new circumference control, we
stabilized the KEKB circumference within about 6 micrometers. In Fall 2006, KEKB will introduce simultaneous
electron-positron injection scheme. We have to change the timing system of KEKB to control the injection phase with
pulse-to-pulse injection. We show the plan of the new timing system due to the simultaneous injection scheme.
Synchronized Data Monitoring and Acquisition System for J-PARC RCS
J-PARC RCS* is a proton synchrotron with
an extreme high power of 1MW, and delicate
care must be taken to suppress radiation due
to beam loss. The RCS injects each beam
H. Takahashi, Y. Ito, Y. Kato, M. Kawase, H. Sakaki, T.S. Suzuki
(JAEA) M. Sugimoto (Mitsubishi Electric Control Software Corp)
pulse of 25 Hz into the MLF** and the MR*** in a predefined order. Furthermore, the different beam control
parameters are required for the MLF and the MR. Therefore, in order to reduce beam loss, synchronicity of data
is indispensable. For this reason, control data monitoring and acquisition must be made separately for each beam
pulse, distinguishing the destination in the control system. The data, which require synchronicity monitoring and
acquisition, are such as beam position data (BPM**** data). We select mainly these data, and we are developing the
synchronized data monitoring and acquisition system based on RM*****, WER******. The status of development and
some test results for this system will be presented in this report.
*Rapid-cycling Synchrotron **Materials and Life Science Facility ***50 GeV Main Ring ****Beam Position Monitor
*****Reflective Memory ******Wave Endless Recorder
Development of the Event Notice Function for PLC
A lot of equipment which controls in J-
PARC accelerator composition machinery us- M. Kawase, H. Takahashi (JAEA/J-PARC) T. Ishiyama (MELCO SC)
ing PLC (Programmable Logic Controller)
exists. The transmitting method to upper control systems, such as interlock information on accelerator composition
apparatus, state changes information, and information on the right of control operation, is not performed by
polling. The event notice function is used and it transmits to the upper control system. In the case of polling,
information is transmitted to the upper control system to a number "msec" order. In the case where the event notice
function is used, an event can be interrupted at the time of event generating, and information can be transmitted to a
target to the upper control system at it. By the J-PARC control system, it makes it possible to transmit the information
on state change (event) to the upper control system immediately from PLC by using the rudder sequence program
which the rudder sequence program for apparatus control detected change of a state, and mounted the event notice
by using this event notice function. The J-PARC control system which mounted the event notice function is reported.
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THPCH116
THPCH117
THPCH118