Remote Control Station in High-Energy Physics Experiment

由于规模巨大，世界上可用于能量前沿实验的大型加速器设施必然限于少数，由大量研究所支持的合作实验成为高能物理实验的常态。在这些实验中，一个成功的关键是对探测器性能的持续监测和对采样数据的快速分析以反馈数据采集。从长远来看，负责探测器维护和操作的大学团体正在寻找通过名古屋名古屋大学高能物理实验室和筑波国家高能物理实验室之间的专用数据传输线连接的远程控制站来控制家庭实验室的实验。通过富士通公司提供的9600bps的专用数据传输线，在名古屋大学的高能物理实验室和筑波的国家高能物理实验室之间建立了一个远程站。远程S…在名古屋，更多的是由Micro VAX计算机控制的DECNET组成，模仿特里斯坦/托帕兹探测器的主数据采集系统。在这份报告中，我们描述了远程站的结构，黄玉探测器的简要描述，在线数据采集，监测和触发系统，以及对远程站的要求。经过两年的性能测试，在1987-89年的黄玉运行期间，NUHEPL几乎所有的探测器信息都被成功地再现和监测，除了由于监测在线数据采集的数据传输速度有限，远程站的响应略显迟钝外，没有发现严重的问题。监测的可视图文方法在实验中被发现不是很有用，因为它不能灵活地响应各种需求。远程站对探测器的控制也用黄玉端盖探测器进行了测试，发现非常有效。然而，需要强调的是，探测器的远程控制需要一条专用的传输线来避免意外的入侵，为了安全起见，探测器元件中需要一些奇特的故障安全机制和多条传输线的连接来避免意外的故障。综上所述，按照本系统构建的远程站在大规模高能物理实验中非常有用，在监测大量探测器系统的详细性能方面不存在严重的技术问题，特别是在黄玉实验中。在当前性能测试的基础上，我们对未来远程站的关键技术进行了几个方面的综述。较少

Due to their extremely large scale,the big accelerator facilities available for energy-frontier experiments in the world is necessarily limited to a small number,and the cooperative experiments supported by a large number of institutes become the normal form of high-energy physics experiment. In these experiment,a key to succsess is continuous monitoring of the detector performance and quick analysis of sampled data to feedback data acquisition. In the long term run,university groups in charge of the maintenance and operation of detectors are looking for possibilities to control experiment from their home laboratories by the remote control station connected by a dedicated data transmission line between the two laboratories.A remote station was constructed between High-Energy Physics Laboratory in Nagoya University at Nagoya (NUHEPL) and National Laboratory for High Energy Physics (KEK) at Tsukuba,through a dedicated data transmission line of 9600bps provided by Fujitsu Co. The remote s … More tation at Nagoya was consisted of DECNET controled by Micro VAX computer emulating the main deta acquision system in TRISTAN/TOPAZ detector. In this report,we describe the structure of remote station,a brief description of TOPAZ detector,on-line data acquisition,monitoring and trigger systems,and then required specifications for the remote-station.After 2-years tests on the performance of present system,it became clear that almost all of the detector informations were successfully reproduced and monitored at NUHEPL during the TOPAZ runs in 1987 to 89,and no serious problems was found except for slightly dull response at the remote station due to the limited data-transfar speed in monitoring on-line data acquisitions. The Videotex method for monitoring was found not so useful in the experiment scince it was not flexible to respond a varity of needs. The control of detectors by the remote station was also tested with the TOPAZ endcap detectors,and was found to be very effective. It should be stressed,however,the remote control of detector needs a dedicated transmission line to avoid unexpected intruders,nd for safety,some fancy fail-safe mechanisms in detector elements and more than one connection of transmission lines are required to avoid unexpected failures.In conclusion,the remote station properly constructed as the present system was found to be very useful in the large scaled highenergy physics experiment,and there was no serious technical problem in monitoring detailed performances of great many detector system,particularly in TOPAZ experiment. Based upon the present performance tests,we reviewed several aspects for the keys to the future remote-stations. Less