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Figure 7
(a) The beam intensity in z along the attenuator at a constant CW input power of 200 W; the pressure was adjusted to make the final attenuation at 105. The dashed red line corresponds to the low power limit. (b) The self-focusing effect as shown by the changing beam profile from the initially assumed flat-top shape at z = 0 mm to be more rounded as z increases. The profiles at z = 4000 and 5000 mm are not distinguished due to the small differences as the self-focusing effect becomes small at lower beam intensities.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 21-28
doi:10.1107/S1600577515018408
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