Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The POLARBEAR Fourier Transform Spectrometer Calibrator and
  Spectroscopic Characterization of the POLARBEAR Instrument   We describe the Fourier Transform Spectrometer (FTS) used for in-field
testing of the POLARBEAR receiver, an experiment located in the Atacama Desert
of Chile which measures the cosmic microwave background (CMB) polarization. The
POLARBEAR-FTS (PB-FTS) is a Martin-Puplett interferometer designed to couple to
the Huan Tran Telescope (HTT) on which the POLARBEAR receiver is installed. The
PB-FTS measured the spectral response of the POLARBEAR receiver with
signal-to-noise ratio (SNR) $>20$ for $\sim$69% of the focal plane detectors
due to three features: a high throughput of 15.1 steradian cm$^{2}$, optimized
optical coupling to the POLARBEAR optics using a custom designed output
parabolic mirror, and a continuously modulated output polarizer. The PB-FTS
parabolic mirror is designed to mimic the shape of the 2.5 m-diameter HTT
primary reflector which allows for optimum optical coupling to the POLARBEAR
receiver, reducing aberrations and systematics. One polarizing grid is placed
at the output of the PB-FTS, and modulated via continuous rotation. This
modulation allows for decomposition of the signal into different harmonics that
can be used to probe potentially pernicious sources of systematic error in a
polarization-sensitive instrument. The high throughput and continuous output
polarizer modulation features are unique compared to other FTS calibrators used
in the CMB field. In-field characterization of the POLARBEAR receiver was
accomplished using the PB-FTS in April 2014. We discuss the design,
construction, and operation of the PB-FTS and present the spectral
characterization of the POLARBEAR receiver. We introduce future applications
for the PB-FTS in the next-generation CMB experiment, the Simons Array.

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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: gr-qc