Generation of THz radiation from dielectric mm-scale capillaries with reflectors.
Laser Undulator Compact X-ray source (KEK LUCX) facility in Japan:
Installation of capillaries in a vacuum chamber at LUCX:
Crosscheck with Transition Radiation for central (zero transverse off-set) and non-central beam propagation; and crosscheck with a PIC simulation:

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KonstantinLekomtsev1 - 05 Jul 2017