Arbitrary order transfer maps for RF cavities

Current modeling of transfer maps for superconducting RF cavities at CEBAF includes only linear effects. Here we extend the transfer mapping modeling capability to include arbitrary order field information generated from the MAFIA field data. We include coupler kicks, normal and skew quadrupole focussing and higher order effects

Description of the RHIC Sequencer System

The movement of the Relativistic Heavy Ion Collider (RHIC) through its various states (eg. injection, acceleration, storage, collisions) is controlled by an application called the Sequencer. This program orchestrates most magnet and instrumentation systems and is responsible for the coordinated acquisition and saving of data from various systems. The Sequencer system, its software infrastructure, support programs, and the language used to drive it are discussed in this paper. Initial operational experience is also described.Comment: Poster paper for ICALEPCS 2001 conference, San Jose, USA, (THAP062), 3 pages in PDF forma

Design and implementation of a slow orbit control package at Thomas Jefferson National Accelerator Facility

The authors describe the design and implementation of a C++ client/server based slow orbit and energy control package based on the CDEV software control bus. Several client applications are described and operational experience is given

Orbit correction using virtual monitors at Jefferson Lab

An orbit correction algorithm is developed to achieve the following goals for the CEBAF accelerator at Jefferson Lab.: (1) Pre-processing of orbit input to account for estimated misalignment and monitor errors. (2) Automatic elimination of blind spots caused by response matrix degeneracy. (3) Transparency of exception handling to interchangeable generic steering engines. (4) CEBAF-specific demands on control of injection angle, path length, orbit effects on optics, simultaneous multiple pass steering, and orbit control at un-monitored locations. All of the above can be accomplished by the introduction of virtual monitors into the processed input orbit, whose theoretical basis is to be discussed in this report. Implementation of all or part of these features and operational experience during the CEBAF variable energy runs will also be discussed

Beoordeling natuurakkoord : globale toetsing van het onderhandelingsakkoord decentralisatie natuur

Het Planbureau voor de Leefomgeving (PBL) heeft op verzoek van het kabinet het ‘Onderhandelingsakkoord decentralisatie natuur’ getoetst. Het Rijk draagt, met het van kracht worden van dit akkoord, het natuurbeleid over aan de provincies. Daarvoor voegt het Rijk jaarlijks 100 miljoen euro toe aan het Provinciefonds. Een belangrijk onderdeel van dat beleid, de Ecologische Hoofdstructuur (EHS), wordt in 2021 afgerond, maar zal dan kleiner van omvang zijn dan oorspronkelijk gepland. De provincies worden verantwoordelijk voor het beheer van de EHS. Met al deze wijzigingen vermindert het Rijk zijn uitgaven voor natuur en landschap met twee derde deel. De vraag die het kabinet aan het PBL heeft gesteld, is of Nederland met de uitvoering van het akkoord en de voorgestelde bezuinigingen kan voldoen aan de internationale verplichtingen en doelstellingen, die voortvloeien uit onder andere de Europese Vogel- en Habitatrichtlijnen

Rapid application development using the Tcl/Tk language

During the last year, high level applications at CEBAF were written using the Tcl/Tk scripting language. This language is rapidly gaining in popularity, in part due to ease of constructing programs with X11 graphical user interfaces, and in part to ease of adding compiled user code for specialized purposes. Extensions to the language provide object oriented programming, which was used to develop a hierarchy of classes relevant for high level accelerator control. We describe basic language features, some 3rd party add-on packages, and local additions to the toolbox. Next we describe features of the accelerator object hierarchy, and finally describe applications written using this toolbox such as the ModelServer prototype, Slow Orbit and Energy Lock, the Linac Energy Management System, and other applications