Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design and Initial Performance of SHARP, a Polarimeter for the SHARC-II
  Camera at the Caltech Submillimeter Observatory   We have developed a fore-optics module that converts the SHARC-II camera at
the Caltech Submillimeter Observatory into a sensitive imaging polarimeter at
wavelengths of 350 and 450 microns. We refer to this module as "SHARP". SHARP
splits the incident radiation into two orthogonally polarized beams that are
then re-imaged onto opposite ends of the 32 x 12 pixel detector array in
SHARC-II. A rotating half-wave plate is used just upstream from the
polarization-splitting optics. The effect of SHARP is to convert SHARC-II into
a dual-beam 12 x 12 pixel polarimeter. A novel feature of SHARP's design is the
use of a crossed grid in a submillimeter polarimeter. Here we describe the
detailed optical design of SHARP and present results of tests carried out
during our first few observing runs. At 350 microns, the beam size (9
arcseconds), throughput (75%), and instrumental polarization (< 1%) are all
very close to our design goals.

36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th