The transparency of liquid scintillators or water is an important parameter
for many detectors in particle and astroparticle physics. In this work, the
Cavity Enhanced Long Light Path Attenuation Length Screening (CELLPALS) method
for the determination of the attenuation length is presented for the first
time. The method is based on an experimental setup similar to a Fabry-P\’erot
interferometer but adding up multiple-reflected intensities of a modulated
light source. CELLPALS was developed to measure the attenuation length of
highly transparent liquids (> 10 m) with significantly lower uncertainties than
with UV-Vis spectroscopy, which is a standard method for determining the
attenuation length. In addition to the attenuation length, the group velocity
of light in the sample can also be derived from the free spectral range of the
cavity, which is not provided by any conventional method for determining the
attenuation length. In this work, the CELLPALS method, its achievable precision
and an experimental setup to demonstrate its feasibility are discussed. The
attenuation lengths and group velocities of several transparent liquids were
measured at wavelengths between 420 nm and 435 nm. In addition, the attenuation
length and group velocity of linear alkylbenzene (LAB) samples after different
purification stages and a purified LAB-based liquid scintillator were measured
at a wavelength of 425 nm. The results confirmed the potential of CELLPALS to
determine the attenuation length with an uncertainty of ~ 2 %. The group
velocity of light in the sample can be determined with an uncertainty of ~ 0.03
%.

Este artículo explora los viajes en el tiempo y sus implicaciones.

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