No abstract available

[en] Control systems being developed for the present generation of accelerators will need to adapt to changing machine and operating state conditions. Such systems must also be capable of evolving over the life of the accelerator operation. In this paper we present a framework for the development of adaptive control systems

[en] The Advanced Light Source (ALS), under construction for the past seven years, has become operational. The accelerator has been successfully commissioned using a control system based on hundreds of controllers of our own design and high performance personal computers which are the operator interface. The first beamlines are being commissioned using a control system based on VME hardware and the Experimental Physics and Industrial Control System (EPICS) software. The two systems are being integrated, and this paper reports on the current work being done

[en] Control systems being developed for the present generation of accelerators will need to adapt to changing machine and operating state conditions. Such systems must also be capable of evolving over the life of the accelerator operation. In this paper we present a framework for the development of adaptive control systems

[en] The Stanford Photon Research Laboratory (SPRL) is constructing a 1 GeV electron storage ring with linac injector. This facility will sponsor basic research in accelerator physics, free electron lasers and applications of synchrotron radiation. This paper presents the design of the SPRL control system and highlights the functions and performance of its major constituents

[en] The advantages of spectrally resolved gamma-ray imaging have previously been demonstrated for the detection of fissile materials. However, previous results have been obtained with the relatively poor spectral resolution provided by scintillator-based detectors. In this paper we present a new class of coded aperture imager based on a position-sensitive germanium detector. The use of this detector type provides a factor of 40 improvement in energy resolution which improves the quality of the images obtained while reducing the integration time required. Tight spectral cuts on known emission lines allow deeper penetration into highly attenuating objects. In addition, advanced analysis techniques can provide information on overlying material though the application of spatially resolved gamma-gauging. We describe the imager, present simulations of its capabilities and the first characterizations of a prototype detector

[en] A smart pixel detector is being developed for Time Resolved Crystallography for biological and material science applications. Using the Pixel Detector presented here, the Laue method will enable the study of the evolution of structural changes that occur within the protein as a function of time. The x-ray pixellated detector is assembled to the integrated circuit through a bump bonding process. Within a pixel size of 150x150 microm², a low noise preamplifier-shaper, a discriminator, a 3 bit counter and the readout logic are integrated. The read out, based on the Column Architecture principle, will accept hit rates above 5x10⁸/cm²/s with a maximum hit rate per pixel of 1 MHz. The detector will allow time resolved Laue crystallography to be performed in a frameless operation mode, without dead time. Target specifications, architecture and preliminary results on the 8x8 front-end prototype and the column readout are presented

[en] The Advanced Light Source (ALS) is a third generation 1--2 GeV synchrotron radiation source designed to provide ports for 60 beamlines. It uses a 50 MeV electron linac and 1.5 GeV, 1 Hz, booster synchrotron for injection into a 1--2 GeV storage ring. Interesting control problems are created because of the need for dynamic closed beam orbit control to eliminate interaction between the ring tuning requirements and to minimize orbit shifts due to ground vibrations. The extremely signal sensitive nature of the experiments requires special attention to the sources of electrical noise. These requirements have led to a control system design which emphasizes connectivity at the accelerator equipment end and a large I/O bandwidth for closed loop system response. Not overlooked are user friendliness, operator response time, modeling, and expert system provisions. Portable consoles are used for local operation of machine equipment. Our solution is a massively parallel system with >120 Mbits/sec I/O bandwidth and >1500 Mips computing power. At the equipment level connections are made using over 600 powerful Intelligent Local Controllers (ILC-s) mounted in 3U size Eurocard slots using fiber-optic cables between rack locations. In the control room, personal computers control and display all machine variables at a 10 Hz rate including the scope signals which are collected though the control system. Commercially available software and industry standards are used extensively. Particular attention is paid to reliability, maintainability and upgradeability. 10 refs., 11 figs

[en] A protein crystallography facility is being constructed for the Advanced Light Source (ALS) wiggler beamline 5.0. The radiation source is a 38 pole, 2.0 T wiggler. Calculations have been performed to determine the source phase space characteristics and the power loading on and transmission of various beamline elements. A set of computer codes have been developed for this purpose. The wiggler horizontal and vertical phase space flux density is calculated by phasex and phasey, respectively. WrFlux calculates the spectral flux density along the principal ray of the optical system. WrPwr calculates the power impinging on a target. If a filter function is specified, the transmitted, or reflected, power is calculated. The theory and operation of the codes will be presented as well as several results of calculations. copyright 1996 American Institute of Physics

[en] The performance specification for ALS insertion devices require detailed knowledge and strict control of the Nd-Fe-B permanent magnet blocks incorporated in these devices. This paper describes the measurement and inspection apparatus and the procedures designed to qualify and characterize these blocks. A detailed description of a new, automated Helmholtz coil facility for measurement of the three components of magnetic moment measurement procedures are described. Together they provide a basis for qualifying blocks and for specifying placement of blocks within an insertion devices' magnetic structures