Design and test results of kicker units for the positron accumulator ring at the APS
Three fast kicker units have been designed, tested, and installed in the positron accumulator ring (PAR) at the Advanced Photon Source (APS) for beam injection and extraction. The performance of these kicker units has been satisfactory. This paper presents the design and test results.
Development of a high quality kicker magnet system
As part of the Fermilab Tevatron upgrade, a 6.25 /spl Omega/ ferrite loaded traveling wave kicker magnet has been designed. The critical parameters are the field rise time and flatness during and after the pulse. A picture frame pole piece configuration was chosen which requires two pulses of equal amplitude but opposite polarity. Low inductance, high voltage capacitors placed between each of the pole pieces provide the shunt reactance necessary to achieve the 6.25 /spl Omega/ impedance. Cross coupling adjacent cells is used to improve the transient response of the magnet. The compensated termination resistors are built into the magnet to minimize reflections. Two spark gap pulsers provide the two 4800 A fast rise time current pulses necessary to drive this magnet. The field in this 2.4 m long magnet rises to 1055 G in less than 400 ns. This paper describes the design choices involved with this system and preliminary test results.<<ETX>>
Solitary Orbital Paget Disease: A Case Report
Purpose: To describe the clinical findings in a patient who had developed painless supraorbital prominence. Methods: Clinical and histopathological findings of the case are reviewed and presented. Results: The patient had an isolated histologically confirmed Paget disease of the orbit. Local excision of the lesion was performed. Conclusion: Paget disease can present not only as a diffuse process but also as a painless, solitary lesion of the orbit.