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Figure 6
(a) Upstream side of a self-sustained Al filter foil with 100 nm thickness used at the FERMI FEL1. The foil wrinkles within the carbon footprint induced by the deposition of the carbon layer at elevated foil temperatures can be clearly distinguished. (b) Upstream side of four different self-sustained Al filter foils with 100 nm foil thickness used at the FERMI FEL1 before (left column) and after (right column) N2/H2 plasma treatment. Several photon beam-induced carbon footprints per filter foil can clearly be distinguished from the images in the left-hand side column.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 6| November 2018| Pages 1642-1649
https://doi.org/10.1107/S1600577518014017
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