The U5. 0 Undulator for the Advanced Light Source

Journal Article · Wed Jan 01 00:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1142755· OSTI ID:5410769

Hoyer, E; Chin, J; Halbach, K; Hassenzahl, W V; Humphries, D; Kincaid, B; Lancaster, H; Plate, D ^[1]

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1. Accelerator and Fusion Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)

The U5.0 Undulator, an 89 period, 5 cm period length, 4.6 m long insertion device has been designed, is being fabricated, and is scheduled for completion in early 1992. This undulator will be the first high brightness source, in the 50 to 1,500 eV range, for the Advanced Light Source at the Lawrence Berkeley Laboratory. A hybrid magnetic configuration using Nd--Fe--B permanent magnet material and vanadium permendur poles has been selected to achieve the field quality needed to meet performance requirements. The magnetic structure is modular with each half consisting of five assembly sections, which provide the periodic structure, and end structures, for entrance and exit correction, mounted on a steel backing beam. Each assembly section consists of 35 half-period pole assemblies bolted to a mount. The required 0.837 T effective peak field at a 1.4 cm gap has been verified with model measurements. Vertical field integral correction is accomplished with the end structures, each having an arrangement of permanent magnet rotors which will be adjusted to minimize electron beam missteering over the undulator operating field range. To reduce the effect of environmental fields, the steel backing beams are connected through parallel, low-reluctance, Ni--Fe hinges. The magnetic structure is connected through four rollernuts to the drive system that provides gap adjustment with an arrangement of roller screws, chain drives, a gear reduction unit, and a stepper motor driven by a closed loop control system. Magnetic structure and drive system support are from a 2.4 m high structure which includes a support base with four vertical supports. The vacuum chamber design is a two-piece machined and welded 5083-H321 aluminum construction of 5.1 m length. Pumping is with a combination of ion, titanium sublimation pump and nonevaporable getter pumps. Magnetic design, subsystem design, and fabrication progress are presented.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5410769
• Journal Information: Review of Scientific Instruments; (United States), Vol. 63:1; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
SYNCHROTRON RADIATION SOURCES
PERMANENT MAGNETS
BEAM EXTRACTION
BORON ALLOYS
BRIGHTNESS
DESIGN
IRON BASE ALLOYS
NEODYMIUM ALLOYS
PERMENDUR
SOFT X RADIATION
STORAGE RINGS
TERNARY ALLOY SYSTEMS
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ALLOY-CO50FE50
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COBALT ALLOYS
COBALT BASE ALLOYS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
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RADIATION SOURCES
RADIATIONS
RARE EARTH ALLOYS
X RADIATION
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