Cryogenic Field Measurement of Pr{sub 2}Fe{sub 14}B Undulator and Performance Enhancement Options at the NSLS-II

Journal Article · Wed Jun 23 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3463195· OSTI ID:21410237

Tanabe, Toshiya; Chubar, Oleg; Harder, David A; Rank, James; Spataro, Charles ^[1]; Lehecka, Michael; Rakowsky, George ^[2]

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1. National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, NY 11973 (United States)
2. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973 (United States)

Short period (14.5mm) hybrid undulator arrays composed of Praseodymium Iron Boron (Pr{sub 2}Fe{sub 14}B) magnets (CR53, NEOMAX, Inc.) and vanadium permendur poles have been fabricated at Brookhaven National Laboratory. Unlike Neodymium Iron Boron (Nd{sub 2}Fe{sub 14}B) magnets which exhibit spin reorientation at a temperatures below 150 K, PrFeB arrays monotonically increase performance with lower operating temperature. It opens up the possibility for use in operating a cryo-permanent magnet undulator (CPMU) in the range of 40 K to 60 K where very efficient cryocoolers are available. Magnetic flux density profiles were measured at various temperature ranges from room temperature down to liquid helium (LHe) using the Vertical Testing Facility (VTF) at the National Synchrotron Light Source-II (NSLS-II). Temperature variations of phase error have been characterized. In addition, we examined the use of textured Dysprosium (Dy) poles to replace permendur poles to obtain further improvement in performance.

• OSTI ID: 21410237
• Journal Information: AIP Conference Proceedings, Vol. 1234, Issue 1; Conference: SRI 2009: 10. international conference on radiation instrumentation, Melbourne (Australia), 27 Sep - 2 Oct 2009; Other Information: DOI: 10.1063/1.3463195; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BORON
BORON COMPOUNDS
CRYOGENICS
DYSPROSIUM
FLUX DENSITY
IRON COMPOUNDS
MAGNETIC FLUX
NEODYMIUM
NSLS
PERMANENT MAGNETS
PERMENDUR
PRASEODYMIUM
PRASEODYMIUM COMPOUNDS
STORAGE RINGS
SYNCHROTRON RADIATION
TEMPERATURE RANGE 0273-0400 K
VANADIUM
WIGGLER MAGNETS
ALLOY-CO50FE50
ALLOYS
BREMSSTRAHLUNG
COBALT ALLOYS
COBALT BASE ALLOYS
ELECTROMAGNETIC RADIATION
ELEMENTS
EQUIPMENT
IRON ALLOYS
IRON BASE ALLOYS
MAGNETS
METALS
RADIATION SOURCES
RADIATIONS
RARE EARTH COMPOUNDS
RARE EARTHS
SEMIMETALS
SYNCHROTRON RADIATION SOURCES
TEMPERATURE RANGE
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS