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Johnson, E. A.

Paper Title Page
TUPMS024 Development of a 100 mm Period Hybrid Wiggler for the Australian Synchrotron Project 1233
  • J. Kulesza, A. Deyhim, E. A. Johnson, D. J. Waterman
    Advanced Design Consulting, Inc, Lansing, New York
  • K. I. Blomqvist
    MAX-lab, Lund
  • C. Glover
    ASP, Clayton, Victoria
  Funding: Australian Synchrotron Project

This paper summarizes the final magnetic measurement for a hybrid wiggler installed at the Australian Synchrotron Project (ASP). This device uses an anti-symmetric, hybrid design with a period of 100 mm and 40 full-strength Vanadium-Permendur poles surrounded by Neodynium-Iron-Boron magnets. It is designed to operate at two gaps with critical energies of 11.4 (14mm) and 9.6 keV (18.16mm) and to have a maximum gap with the field strength By ≤ 50 G. The wiggler's drive mechanism is capable of moving from minimum to maximum gap in 96 seconds. End terminations are designed to maintain the electron trajectory on-axis. The straightness of the electron orbit is controlled by moving the poles vertically and horizontally. The integrated multipoles are controlled over the interval |x| < 25 mm and all gap sizes by moving the side magnets, installing correction magnets at the wiggler entrance and exit and using correction coils. All adjustments have been made using threaded fasteners. No shims have been used.

TUPMS027 Development of Software to Control 8-Motor Elliptically Polarizing Undulators 1239
  • C. Spackman, E. A. Johnson
    Advanced Design Consulting, Inc, Lansing, New York
  • A. Deyhim
    Physics Teachers Association, Knoxville, Tennessee
  • J. T. Thånell, E. J. Wallen
    MAX-lab, Lund
  Funding: Swedish Natural Research Council (Vetenskapsrdet)

Advanced Design Consulting developed control software entitled IDcontrol for its state-of-the-art Apple II insertion devices (ID). These IDs feature 8 controllable axes: four servo motors control the gap and taper of two main girders, and four servo motors control the photon polarization-state by manipulating four sub-girders. IDcontrol simultaneously positions all 8 axes with high precision in real-time using 0.1 micron linear encoders attached directly to the girders and sub-girders. Helical and Inclined Plane phase modes are supported with automated mode switching. Magnetic-field-correction-coil current and girder taper are adjustable as functions of gap, phase, and phase mode. IDcontrol continuously monitors redundant encoder velocity and position data for maximal reliability, encoder failure detection, and damage prevention. Combined with ADCs Graphical User Interface (GUI) entitled IDgui, IDcontrol manipulates the ID, provides user notification and automated recovery from errors, management of correction data, and isometric visualization of the ID's girders. The functionality of both IDcontrol and IDgui has been demonstrated at MAX lab and the results will be discussed.