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Figure 6
FIR spectra of the PhSR (red line) at 120 mA beam current and 100 Hz injection are compared with that of a ceramic heater (violet line) of diameter 7.1 mm at 1500 K by the FTIR with a cooled Si bolometer. The drop near 72 cm−1 is due to absorption in the diamond wedged crystal quartz of the bolometer filter. The green line indicates their intensity ratio indicated on the right. It is seen that the PhSR provides more photons than the thermal source below 77 cm−1. At 17 cm−1 the PhSR advantage approaches a factor of 41 with a 2 mm-size aperture, which is indicated as A in Fig. 2(b)[link].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 16| Part 2| March 2009| Pages 299-306
https://doi.org/10.1107/S0909049509000144
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