Nuclear Instruments and Methods in Physics Research A 352 (1994) 128-130 North-Holland NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH Sect,onA The rejuvenation status of TRISTAN accelerator control system T. Mimashi a, A. Akiyama a, S. Araki a, K. Kudoh ~, I. Komada ~, T. Kawamoto a, S. Kurokawa ", T. Naitoh a, S. Takeda a, j. Urakawa ~, T. Takashima a, K. Furukawa ~, J. Navratil b K. Oide a N. Yamamoto a a National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305, Japan b CTU-Computer Center, Zikova 4, 16635 Prague 6, Czech Republic Ten years have passed since the current control system started the operation of the TRISTAN accelerator. The system uses CAMAC as a front-end electronics, and they are controlled by 25 Hitachi process computers linked by a N to N token ring network. In order to have the ability to perform complicated accelerator operations, there is a strong request to renew these 25 process computers. Firstly, we review how we will rejuvenate the current control system under some constraints, such as the lack of man-power, limited time and financing. This is followed by proposals for the next step of rejuvenation. 1. Introduction The problems of the current main control system were discussed at ICALEPCS'91 [1]. In addition to the difficulty of maintenance, there is an urgent require- ment to use the SAD (Strategic Accelerator Design) [2], which is the set of programs for accelerator simula- tion and optics matching calculations for operation. In particular, the study of KEK future projects, such as KEK B-factory [3] and TRISTAN Super Light Facility [4] shows the need for very complicated calculations. In order to satisfy these requirements, the rejuvenation of the system started by rebuilding the operational con- soles and preparing the interface to the SAD. 2. The rejuvenation status of the TRISTAN accelerator control system 2.1. Overview Because of the recent drastic improvement in the calculation speed of workstations, it is now possible to obtain more CPU, memories, disks, etc with lower cost and reasonable reliability. Some workstations have been added to the TRISTAN control system. As shown in Fig. 1, the current control system consists of three systems; i.e. the main control system, the RF control system and the second control system. The main con- trol system is composed of 25 Hitachi process com- puter, model HIDIC'80s. The RF control system is composed of 7 VAX stations which are used for the aging of RF cavities. The second control system is composed of Unix workstations, VME systems and X terminals. These control systems are connected to the Linac control system, the main frame computer (Hitach HITAC, Fujitsu FACOM) in the KEK computer cen- ter and the workstation cluster for accelerator simula- tion (SAD). FDDI network which were laid along the TRISTAN tunnel also connect to the second control system. 2.2. The workstation cluster for accelerator simulation study The SAD codes have been developed in the KEK accelerator department, and are used for the design of many accelerators. They were developed on the main frame and, last April, all codes were moved to the Unix workstation cluster. Although we need large CPU power, the size of the data we treat is relatively small. So, the decision was taken to move them to the high speed workstation cluster. Since the SAD codes are written in Fortran, the installation has been smooth. The Unix workstation cluster is composed of 4 Hewlett-Packard workstations, 9000/755 and 9000/ 735, and they are connected by an FDDI network to each other. The batch jobs are controlled by a Task broker, which is a software product of the Hewlett- Packard company. The interactive users are automati- cally distributed to the least used workstation by a simple shell program. This cluster is connected to the TRISTAN accelerator control system via Ethernet. The kick angle of each steering magnet and the data for closed orbit distortion (COD) measured by beam moni- tors can be stored in this system in the SAD input format. 0168-9002/94/$07.00 © 1994 - Elsevier Science B.V. All rights reserved SSDI 0168-9002(94)00027-5