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Figure 6
Calculated (A, B, C) and observed (D) peak brightness of 6 cm × 60 period undulator at BL-2, Photon Factory, against the field parameter K. Curve A is plotted by assuming a low-emittance limit (<10 nm rad−1), B is corrected for a finite aperture, and C is the value for the actual emittance of PF-ring, 400 nm rad−1. The absolute brightness (D) was deduced from the photoelectron count of helium as the target gas (Sasaki, 1986).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 5| Part 3| May 1998| Pages 140-146
https://doi.org/10.1107/S0909049598003070
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