===== OTR Spectral Investigation =====

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A Spectrometer (Horiba CP 140-202, 116-635 nm) was used for spectral analysis of the OTR signal.
The following was investigated:
  * OTR signal comparison for polished stainless steel and for aluminium foil (10µm Al on Kapton)
  * Comparison of spectral emission at different time windows (during and after the beam pulse)