The electron beams being delivered to targets of the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson National Accelerator Facility (Jefferson Lab) are plagued with undesirable positional and energy fluctuations. These fluctuations primarily occur at harmonics of the power line frequency (60, 120, 180, etc. hertz), and their cause is rooted in electromagnetic fields gen...

This paper will discuss software engineering practices used to improve Control System reliability. We will begin with a brief discussion of the Software Engineering Institute’s Capability Maturity Model (CMM) which is a framework for evaluating and improving key practices used to enhance software development and maintenance capabilities. The software engineering processes developed and used by ...

SAD (Structured Accelerator Design) is a modeling program developed and widely used in KEK. The rejuvenated TRISTAN control system uses SAD as an integral part of the system. The main program of the rejuvenated control system, which has a graphical user interface based on X-window system on a UNIX work station, uses SAD for optics calculation, beam orbit correction and orbit bump calculation. O...

∗ Undergraduate Research Participants Abstract Argonne’s ATLAS (Argonne Tandem-Linac Accelerator System) control system comprises two separate database concepts. The first is the distributed real-time database structure provided by the commercial product Vsystem [1]. The second is a more static relational database archiving system designed by ATLAS personnel using Oracle Rdb [2] and Corel Parad...

Recently the technological linear electron accelerators with the energy up to 10 and 25 MeV and the pulse current up to 1A have been developed and put into operation in the "Accelerator" R&D Production Establishment of the National Science Center, Kharkov Institute of Physics and Technology [1]. The zone of the technological object irradiation by the accelerated electrons is created by the magn...

Medical accelerators require arc-free operation. Due to high-field emission, arcing and outgassing can occur in high-power accelerators. Therefore, the accelerator’s inner surfaces have to be conditioned before its use at high gradient levels in Radiation Therapy machines. At Siemens, we have developed a technique to automatically condition accelerator structures by continually inspecting the a...

A control system for Hall B at the Thomas Jefferson National Accelerator Facility is being developed within the framework of the Experimental Physics and Industrial Control System (EPICS). The Hall B equipment currently under EPICS control includes numerous beam line devices, high voltage power supplies, detector gas systems, and safety systems. The status of the control system is described.

This paper concerns with a new class of adaptive gain-scheduled H∞ control of linear parametervarying (LPV) systems with time-delayed elements. The plants in this manuscript are assumed to be polytopic LPV systems which have time-delayed components, but the scheduled parameters and time-delayed elements in those plants are not known a priori, and thus, the conventional gain-scheduled control st...