Spectral character of optimized undulator insertion devices for the Synchrotron X-ray Source at Argonne

Conference · Sun Mar 01 04:00:00 EST 1987

OSTI ID:6290198

Kim, S H; Viccaro, P J; Shenoy, G K

Two general types of undulator x-ray sources are planned for the Advanced Photon Source (APS) to be built at Argonne. One is to provide first harmonic radiation tunable over the interval of 7 to 14 keV during the initial phase of operation of the storage ring. This tunability range will increase for the same device to approximately 4.7 to 14 keV during the mature phase of operation. A second device with a smaller period is planned for those cases where the intensity of the third harmonic radiation from the above device is not sufficient. In this case, the undulator will provide 20 keV radiation in the first harmonic. The magnetic design of both devices will be a hybrid type which uses the Nd-Fe-B alloy as the permanent magnet material and vanadium permendur as the pole-tip. As part of the optimization scheme, the magnetic field calculations have been carried out using a version of the two dimensional field code PANDIRA. In this approximation, the width of the undulator is assumed to be infinite. Three dimensional effects associated to finite pole widths have been estimated using experimental results of single pole measurements for a 7 cm period device. In addition, numerical calculations of the spectral characteristics have been done using the magnetic design parameters and taking into account the emittance expected for the APS. On-axis brilliance results as well as expected spectral power densities have been determined.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6290198
• Report Number(s): CONF-870302-210; ON: DE87011499
• Country of Publication: United States
• Language: English

Related Subjects

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ANL
COMPUTER-AIDED DESIGN
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETIC FIELDS
MAGNETS
NATIONAL ORGANIZATIONS
RADIATION SOURCES
SPECTRA
SYNCHROTRON RADIATION SOURCES
TUNING
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WIGGLER MAGNETS