摘要:

The data system for the advanced toroidal facility (ATF) is a logical extension of the system used for the Impurity Studies Experiment ISX‐B. Based on the ISX‐B concepts and hardware, it extends them to provide support for long‐pulse or steady‐state operation of ATF. The system is now network based rather than shared memory based and can dynamically add or remove processors. The hardware consists of a pair of VAX 8700 CPUs and an assortment of MicroVAX front ends. This hardware acquires all data, generates all control waveforms, and provides trending and logging services for the safety interlock and control systems. These systems are based on programmable logic controllers (PLCs) which are independent of the data system. The software consists of three major components: a master scheduling and monitoring system (SAMS) that provides synchronizing services and allocates files and memory; a signal‐based data and file management package (DMG) that provides data access services; and the ORNL CAMAC driver package. All diagnostics are supported by data acquisition and analysis software (either generic or specialized) that is based on and shared by these services.

ISSN:0034-6748    

DOI:10.1063/1.1140105

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

The MINGL database system is an integrated set of tools which provides a means of collecting and managing diagnostic data and transport code results from TFTR. An interactive menu‐driven format allows users to collect scalar and profile data from various data sources into shareable INGRES databases. LOCUS and INGRES/QUEL/SQL interfaces make it easy to browse, select, compare, and display the data in one of several formats. Utilities exist for managing the individual data sets and restricting their accessibility, for indexing the tables by author, and for maintaining a table of contents for an entire database. The modularity of the system allows automated database‐server applications for between‐shot analysis and display.

ISSN:0034-6748    

DOI:10.1063/1.1140106

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

The conceptual design of the data handling system for the Compact Ignition Tokamak (CIT) takes advantage of the recent and upcoming advances in the technologies of database management systems, workstations, networking, and front‐end processing. The software configuration of a diagnostic’s front‐end signal conditioning, data acquisition, and data reduction by means of filling in tables and specifying ‘‘objects’’ for the data transformations will provide a more powerful tool for efficient application ‘‘programming.’’ The maintenance of an audit trail of chains of transformations (input data and processes) will permit identification and recalculation of results which are affected by modifications of calibrations and processing.

ISSN:0034-6748    

DOI:10.1063/1.1140107

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

Location‐independent data access methods are being developed at Lawrence Livermore National Laboratory to manage and use data acquired by a multivendor distributed laboratory computer network. An interprocess communication system (IPCS) is used to connect tasks which produce, manage, or use experimental data. These tasks may run on any of the computers in the network. A central database and database server maintain supervisory records of experimental activity and locations of data produced by the experiment. Data may be located in several subsidiary local databases, file systems, or tape archives. Data access requests, if they cannot be satisfied locally, are routed via the IPCS to database servers, which locate and retrieve (or store) the requested data. We describe the design details and give examples of the current implementation.

ISSN:0034-6748    

DOI:10.1063/1.1140108

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

A menu‐style user interface has been developed at Lawrence Livermore National Laboratory (LLNL) for distributed control, data acquisition, and data processing. A graphical menu editor, which is itself the first application of the menu system, is used to construct or modify menu hierarchies. Unlike many menu systems, no code need be written to demonstrate a set of menus because there are no subroutine calls to make menus; developers need only write the code that performs the actions indicated by user menu picks. In addition to this rapid prototyping feature, the menu system is integrated with operating system asynchronous traps (in Unix, signals, and selects) so that it supports real‐time user interfaces for control in a distributed computer system. UFrsi1

ISSN:0034-6748    

DOI:10.1063/1.1140109

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

LOCUS is a database system for creating, manipulating, and interactively investigating databases. LOCUS was written in response to the need to study the data from the experimental devices at the Princeton Plasma Physics Laboratory and is now also used extensively at other fusion laboratories. An example of its use is the determination of scaling laws for tokamak plasmas. To do this, LOCUS allows the user to enter and modify data, define subsidiary variables as arbitrary functions of original data, plot and fit such variables, and perform multiple linear regression analysis. Through a flexible interactive interface the program is easy to learn and largely self‐documenting. There are two implementations of LOCUS: one that manipulates data in VAX/VMS ISAM files and another that manipulates data in the commercial relational database management system INGRES.

ISSN:0034-6748    

DOI:10.1063/1.1140110

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

Data management for the Advanced Toroidal Facility (ATF), a stellarator located at Oak Ridge National Laboratory, is provided by DMG, a locally developed, VAX‐based software system. DMG is a data storage and retrieval software system that provides the user interface to ATF raw and analyzed data. Data are described in terms of data models and data types and are organized as signals into files, which are internally documented. The system was designed with user accessibility, software maintainability, and extensibility as primary goals. Extensibility features include compatibility with ATF as it moves from pulsed to steady‐state operation and capability for use of the DMG system with experiments other than ATF. DMG is implemented as a run‐time library of routines available as a shareable image. General‐purpose and specialized data acquisition and analysis applications have been developed using the DMG system. This article describes the DMG system and the interfaces to it.

ISSN:0034-6748    

DOI:10.1063/1.1140111

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

A distributed data‐acquisition system that used various computer hardware and software is being developed to support magnetic fusion experiments at Lawrence Livermore National Laboratory (LLNL). The experimental sequence of operations is controlled by a supervisory program, which coordinates software running on Digital Equipment Corporation (DEC) VAX computers, Hewlett–Packard (HP) UNIX‐based workstations, and HPbasicdesktop computers. An interprocess communication system (IPCS) allows programs to communicate with one another in a standard manner regardless of program location in the network or of operating system and hardware differences. We discuss the design and implementation of this data‐acquisition system with particular emphasis on the coordination model and the IPCS.

ISSN:0034-6748    

DOI:10.1063/1.1140112

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

The new, compact data‐acquisition system of the reversed field pinch device, REPUTE‐1, is reported. Its distinctive feature is high flexibility and easy handling. The interface between the computer and measurement devices is CAMAC. The computer and the CAMAC devices are connected to a CAMAC byte serial highway that transmits setup parameters and acquisition data. The computer carries out setup of CAMAC devices and data acquisition automatically by use of CAMAC parameters and the acquisition data base. The maintenance tools for the data base are also provided. The computer system, which consists of a ‘‘TOSBAC DS‐600,’’ has been in operation for REPUTE‐1 since 1985.

ISSN:0034-6748    

DOI:10.1063/1.1140113

出版商:AIP    

年代:1988

数据来源: AIP

摘要:

The promises of the ultrahigh‐performance properties of superconductivity and Josephson junction technologies have been known for quite some time. This presentation describes the first superconducting electronics and measurement system and its important role as a major tool to advance microwave and millimeter wave technologies. This breakthrough tool is a sampling oscilloscope with 5‐ps rise time, 50‐&mgr;V sensitivity, and a time domain reflectometer with 8‐ps rise time. In order to achieve these performance goals, several technological hurdles had to be overcome including perfecting a manufacturing process for building Josephson junction IC chips, developing an innovative cooling technique, developing interfaces and interconnections with bandwidths in excess of 70 GHz, and developing the room‐temperature hardware and software necessary to make the instruments convenient, easy to use, easy to learn, in addition to making available functions and features users have come to expect from sophisticated digital test instrumentation. These technological developments are stepping stones leading to the realization of more sophisticated and complex electronic systems satisfying the needs of scientists, technologists, and engineers. The unprecedented speed and sensitivity make it possible to attack new frontiers.

ISSN:0034-6748    

DOI:10.1063/1.1140114

出版商:AIP    

年代:1988

数据来源: AIP