THE OXFORD SUBMICRON NUCLEAR MICROSCOPY FACILITY
THE OXFORD SUBMICRON NUCLEAR MICROSCOPY FACILITY
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DOI：
10.1016/0168-583x(91)95490-5
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发表时间：
1991-03-01
影响因子：
1.3
通讯作者：
WATT, F
中科院分区：
文献类型：
--
作者：
GRIME, GW;DAWSON, M;WATT, F
本文介绍了目前在牛津大学建立的独特的核微探测器设施。该系统使用专用的小型加速器，每天定期运行，因此设计的重点一直是在实现可靠的高质量性能的同时，将聚焦系统和离线数据处理的开销降至最低。最终的透镜是专门开发的，具有可以忽略的六极场污染，允许使用简单的对准程序进行亚微米操作。该系统使用最多三条带有专门靶室的光束线。数据采集系统采用分布式处理，VMEbus 68020微型计算机系统处理多达6个探测器的数据采集和在线分类，图形工作站用于操作员接口，大型计算机用于数据存档和离线处理。系统各部件通过以太网进行通信，并开发了低故障率/高吞吐量的通信协议。归档程序旨在处理高数据量(每天高达100 Mb)，具有高效的数据压缩、透明的最新数据调用和简单的归档数据恢复。
This paper describes the unique nuclear microprobe facility now established in the University of Oxford. The system, which uses a dedicated small accelerator, operates on a regular daily basis, therefore the emphasis of the design has been on achieving reliable, high-quality performance while minimising overheads of alignment in the focusing system and off-line data processing.The beam-optical system from the ion source to the final lens is described. The final lens has been specially developed to have negligible sextupole-field contamination which allows submicron operation using simple alignment procedures. The system uses up to three beam lines with specialised target chambers. These are described briefly.The data acquisition system uses distributed processing with a VMEbus 68020 microcomputer system handling collection and on-line sorting of data from up to six detectors, a graphics workstation for operator interfacing and a mainframe computer for archiving and off-line processing of data. The components of the system communicate via Ethernet and a low-failure-rate/high-throughput communications protocol has been developed. The archiving procedures are designed to handle high volumes of data (up to 100 Mb per day) with efficient data compression, transparent recall of recent data and simple restoration of archived data.