Title :
The U5.0 undulator for the ALS
Author :
Hoyer, E. ; Chin, J. ; Halbach, K. ; Hassenzahl, W.V. ; Humphries, D. ; Kincaid, B. ; Lancaster, H. ; Plate, D.
Author_Institution :
Lawrence Berkeley Lab., California Univ., CA, USA
Abstract :
The U5.0 undulator, an 89-period, 5-cm-period-length, 4.6-m-long insertion device, has been designed and is in fabrication. This undulator will be the first high-brightness source, in the 50-1500-eV range, for the Advanced Light Source (ALS) and is scheduled for completion in 1992. A modular hybrid configuration utilizing Nd-Fe-B permanent magnet material and vanadium permendur is used. It achieves a 0.837-T effective peak field. Correction of the vertical field integral is achieved with permanent magnet rotors at the ends. Gap adjustment is done with an arrangement of roller screws, chain drives, a gear reduction unit, and a stepper motor driven by a closed-loop control system. The vacuum chamber design is a two-piece, machined and welded 5083-H321 aluminum construction of 5.1-m length. Magnetic design, subsystem design, and fabrication progress are presented.<>
Keywords :
X-ray production; electron accelerators; permanent magnets; storage rings; synchrotron radiation; wigglers; 0.837 T; 4.6 m; 5 cm; 5.1 m; 50 to 1500 eV; Advanced Light Source; Nd-Fe-B; U5.0 undulator; fabrication progress; high-brightness source; insertion device; magnetic design; modular hybrid configuration; permanent magnet; permanent magnet rotors; subsystem design; vacuum chamber design; vanadium permendur; Control systems; Fabrication; Fasteners; Gears; Light sources; Magnetic materials; Permanent magnet motors; Permanent magnets; Rotors; Undulators;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.165083
