Spectral properties of segmented undulators for the 7-GeV Advanced Photon Source

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1140912· OSTI ID:5831556

Shenoy, G K; Viccaro, P J; Alp, E E

The effect of nonzero particle beam emittance and magnetic field errors on the on-axis spectral brightness (/ital BT//sub 0/) of long undulators is discussed. It is shown that the quadratic dependence of /ital BT//sub 0/ on the number of undulator periods, /ital N/, is reduced by emittance to /ital N//sup /ital x// with 1/le//ital x//lt/2. Further reductions in the intensity result from random magnetic field errors present in the undulator. An approximate model for the intensity of the central core of radiation of the principle harmonics is discussed and the results compared to those from Monte Carlo-type calculations where emittance is explicitly accounted for. An estimation of the effects of random field errors on the on-axis brightness in the presence of nonzero particle emittance is made. For the particular case of undulators proposed for the 7-GeV Advanced Photon Source, the results indicate that 5-m-long devices segmented into two sections will provide the required spectral intensity of a single long undulator when both emittance and magnet errors are considered.

• Research Organization: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (US)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5831556
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 60:7; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430400* -- Particle Accelerators-- Storage Rings
BEAM EMITTANCE
BREMSSTRAHLUNG
BRIGHTNESS
CORRELATIONS
COST
DESIGN
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
ERRORS
GEV RANGE
GEV RANGE 01-10
HARMONICS
MAGNETIC FIELDS
OPTICAL PROPERTIES
OPTICAL SYSTEMS
OSCILLATIONS
PHYSICAL PROPERTIES
RADIATION SOURCES
RADIATIONS
RESONATORS
STORAGE RINGS
SYNCHROTRON RADIATION
X-RAY EQUIPMENT
X-RAY SOURCES