scholarly journals Batch Measurement of Attenuation Length of Wavelength-shifting Fibers for LHAASO Electromagnetic Detectors

2019 ◽  
Author(s):  
Xiaopeng Zhang ◽  
Chao Hou ◽  
Xiangdong Sheng ◽  
Keyword(s):  
Attenuation Length ◽  
Wavelength Shifting Fibers

Evidence of metamaterial physics at the geophysics scale: the METAFORET experiment

2019 ◽  
Author(s):  
Martin Lott ◽  
Philippe Roux ◽  
Stéphane Garambois ◽  
Philippe Guéguen ◽  
Andrea Colombi
Keyword(s):  
Surface Waves ◽  
Attenuation Length ◽  
Dense Forest ◽  
Complex Wave ◽  
Seismic Surface Waves ◽  
Source Excitation ◽  
Ground Penetrating ◽  
Dense Seismic Array ◽  
Seismic Wavefield ◽  
Large Frequency

Abstract The METAFORET experiment was designed to demonstrate that complex wave physics phenomena classically observed at the meso- and micro-scales in acoustics and in optics also apply at the geophysics scale. In particular, the experiment shows that a dense forest of trees can behave as a locally resonant metamaterial for seismic surface waves. The dense arrangement of trees anchored into the ground creates anomalous dispersion curves for surface waves, which highlight a large frequency band-gap around one resonant frequency of the trees, at ∼45 Hz. This demonstration is carried out through the deployment of a dense seismic array of ∼1000 autonomous geophones providing seismic recordings under vibrating source excitation at the transition between an open field and a forest. Additional geophysical equipment was deployed (e.g. ground-penetrating radar, velocimeters on trees) to provide essential complementary measurements. Insights and interpretations on the observed seismic wavefield, including the attenuation length, the intensity ratio between the field and the forest and the surface wave polarization, are validated with 2D numerical simulations of trees over a layered halfspace.

Experimental determination of the effective attenuation length of palladium 3d 5/2 photoelectrons in a magnetron sputtered Pd nanolayer

2016 ◽  
Vol 49 (5) ◽  
pp. 464-468
Author(s):  
Paul M. Dietrich ◽  
Dieter Treu ◽  
Henryk Kalbe ◽  
Michael Krumrey ◽  
Thomas Gross ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Attenuation Length

scholarly journals Results on radio attenuation length recorded in a Romanian salt mine

2017 ◽  
Author(s):  
Alina Badescu ◽  
A. Saftoiu ◽  
I. Brancus ◽  
D. Stanca ◽  
B. Mitrica
Keyword(s):  
Salt Mine ◽  
Attenuation Length

scholarly journals Liquid Argon Instrumentation and Monitoring in LEGEND-200

2021 ◽  
Vol 253 ◽  
pp. 11014
Author(s):  
Mario Schwarz ◽  
Patrick Krause ◽  
Andreas Leonhardt ◽  
Laszlo Papp ◽  
Stefan Schönert ◽  
...  
Keyword(s):  
Data Analysis ◽  
Liquid Argon ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Optical Parameters ◽  
Water Tank ◽  
Light Collection ◽  
Wavelength Shifting Fibers ◽  
Detection Medium

LEGEND is the next-generation experiment searching for the neutrinoless double beta decay in 76Ge. The first stage, LEGEND-200, takes over the cryogenic infrastructure of GERDA at LNGS: an instrumented water tank surrounding a 64 m3 liquid argon cryostat. Around 200 kg of Ge detectors will be deployed in the cryostat, with the liquid argon acting as cooling medium, high-purity passive shielding and secondary detection medium. For the latter purpose, a liquid argon instrumentation is developed, based on the system used in GERDA Phase II. Wavelength shifting fibers coated with TPB are arranged in two concentric barrels. Both ends are read out by SiPM arrays. A wavelength shifting reflector surrounds the array in order to enhance the light collection far from the array. The LLAMA is installed in the cryostat to permanently monitor the optical parameters and to provide in-situ inputs for modeling purposes. The design of all parts of the LEGEND-200 LAr instrumentation is presented. An overview of the geometry, operation principle, and off-line data analysis of the LLAMA is shown.

Attenuation Length for Photoelectrons in Metal Films

1970 ◽  
Vol 41 (4) ◽  
pp. 1869-1870 ◽  
Author(s):  
W. Pong ◽  
R. Sumida ◽  
G. Moore
Keyword(s):  
Metal Films ◽  
Attenuation Length
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