Graphic Display System Research Articles

Computer-Based Visualization and Manipulation of Orbit Warps in the Zero Gradient Synchrotron (ZGS)

The low energy orbit warps in the ZGS are corrected by eight current-regulated single-turn kicker windings. The currents regulated in these coils can be set individually by the operators through a central digital control system. Since large first harmonic warps are produced by small current changes in single coils, blind, individual adjustment of the eight currents is seldom productive. This paper describes a computer program and interactive graphic display system which allow accelerator operators to visualize the effects of single or multiple kicker coil current changes. The display provides numeric as well as graphic representation of the orbit warp produced. Localized orbit bumps can be inserted by specifying location and size. The program can be used for offline visualization purposes only, or optionally the desired currents can be introduced immediately by the computer.

Application of Graphic Display System to Urban Design

Application of Graphic Display System to Urban Design

The LASL Multi-Computer Van De Graaff Control and Graphic Display System and Experiments with Automatic Beam Optimization

The LASL Van de Graaff Facility includes two accelerators, an 8 MeV vertical and a 16 MeV tandem. Subsystems are being monitored and controlled by a Honeywell H610 process control computer. To improve the man/computer/accelerator communication an Adage AGT-10 graphics system was obtained. Presently the AGT-10 is connected to the H610 and a XDS-930 computer used for data acquisition. Control and monitoring functions have been implemented using the graphics system. It has proved particularly valuable in the optimization problem where many variables may be changed simultaneously. Multi-parameter optimization algorithms suitable for nonlinear objective functions with constraints are being tested on the tandem. Ones which have large tolerance to variations in the measured quantities and fast convergence are being sought. Results to date are given.

Parametric graphical computer display system using analogue storage

A cathode-ray-tube graphical display system for use as a digital-computer output terminal has been developed The display employs analogue function-generation circuits to produce line drawings composed of straight-line and curved-line segments which are specified by parameters transferred from the computer in analogue form. To maintain a flicker-free image, while also imposing a minimal demand on the computer to which it is connected, the display incorporates an analogue memory composed of capacitors and field-effect-transistor switches. The displayed image may then be refreshed at the required rate by cyclically reading the line and curve control parameters from this memory. The computer need only access the memory to insert fresh data to be displayed or, infrequently, to refresh the stored information. The paper includes discussions of the specification of the overall display system, of the design of the analogue storage system and of two methods used to produce the required picture segments for display. Some results obtained with the display connected online to a small digital computer are shown.

Some theoretic aspects of vascular degeneration

Certain theoretic aspects of vascular degeneration are presented. It is our general theory that the initiating factor in atherosclerosis is a series of molecular changes in the connective tissue of arteries, especially in elastin fibers. These molecular changes result in alterations in the physical properties of vessels, which make the arteries increasingly vulnerable to stress. The localization of the atherosclerotic process is determined primarily by rheologie factors, and the computer and graphic display system have provided new methods of studying the fluid dynamics of the vascular system.

Capabilities and Uses of a Graphic Display System as an Interface between the Zero Gradient Synchrotron Computer and the Human Operator

The control computer system at the Zero Gradient Synchrotron (ZGS) contains a 20" cathoderay graphic display system that can generate points, vectors, and characters. A variety of software routines have been written to operate the ZGS monitor on-line to obtain the required data, to perform the necessary calculations, and to generate the specific display patterns. Two dimensional displays describe accelerator parameters that are functions of time, of a space coordinate, or of a second machine parameter such as ring magnet field. "Three dimensional", displays (isometric), such as tune as a function of radial position and of ring magnet field, can also be generated. Many of the display patterns can be updated quickly enough so that the operator can follow the changes during an adjustment or optimization procedure. Experience shows that this display system can present complex information to the ZGS operator in a form that is easily understood. Permanent records of display information can be made by photography, by using the 30" X-Y plotter system, and by using the line printer. A variety of examples are discussed.

A queuing model for a simple case of time sharing

Of late, considerable attention has been given to time-sharing computer systems. To provide a close relationship between the computer and its users, these systems typically handle a variety of remote terminals, from typewriters to computer graphic display systems. Although many source terminals may employ the computer concurrently, the objective is to provide a form of terminal service that makes it appear to each terminal operator as if he were the only one using the computer.