The major construction and initial-phase operation of a second-generation gravitational-wave detector, KAGRA, has been completed. The entire 3 km detector is installed underground in a mine in order to be isolated from background seismic vibrations on the surface. This allows us to achieve a good sensitivity at lowfrequencies and high stability of the detector. Bare-bones equipment for the interferometer operation has been installed and the first test runwas accomplished in March and April of 2016 with a rather simple configuration. The initial configuration of KAGRA is called iKAGRA. In this paper, we summarize the construction of KAGRA, including a study of the advantages and challenges of building an underground detector, and the operation of the iKAGRA interferometer together with the geophysics interferometer that has been constructed in the same tunnel.
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The large-area hybrid-optics CLAS12 RICH: First years of data-taking
The CLAS12 deep-inelastic scattering experiment at the upgraded 12 GeV continuous electron beam accelerator
facility of Jefferson Lab conjugates luminosity and wide acceptance to study the 3D nucleon structure in the
yet poorly explored valence region, and to perform precision measurements in hadron spectroscopy. A large
area ring-imaging Cherenkov detector has been designed to achieve the required hadron identification in the
momentum range from 3 GeV/c to 8 GeV/c, with the kaon rate about one order of magnitude lower than
the rate of pions and protons. The adopted solution comprises aerogel radiator and composite mirrors in a
novel hybrid optics design, where either direct or reflected light could be imaged in a high-packed and high segmented photon detector. The first RICH module was assembled during the second half of 2017 and installed
at the beginning of January 2018, in time for the start of the experiment. The second RICH module, planned
with the goal to be ready for the beginning of the operation with polarized targets, has been timely built
despite the complications caused by the pandemic crisis and successfully installed in June 2022. The detector
performance is here discussed with emphasis on the operation and stability during the data-taking, calibration
and alignment procedures, reconstruction and pattern recognition algorithms, and particle identification.
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- PAR ID:
- 10475798
- Publisher / Repository:
- NIM
- Date Published:
- Journal Name:
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
- Volume:
- 1057
- Issue:
- C
- ISSN:
- 0168-9002
- Page Range / eLocation ID:
- 168758
- Subject(s) / Keyword(s):
- Spin, proton structure, kaon, pion, SIDIS
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
-
Accepted Manuscript1.0
- Journal Article:
- https://doi.org/10.1016/j.nima.2023.168758
