Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Implications of the Quantum Noise Target for the Einstein Telescope
  Infrastructure Design   The design of a complex instrument such as Einstein Telescope (ET) is based
on a target sensitivity derived from an elaborate case for scientific
exploration. At the same time it incorporates many trade-off decisions to
maximise the scientific value by balancing the performance of the various
subsystems against the cost of the installation and operation. In this paper we
discuss the impact of a long signal recycling cavity (SRC) on the quantum noise
performance. We show the reduction in sensitivity due to a long SRC for an ET
high-frequency interferometer, provide details on possible compensations
schemes and suggest a reduction of the SRC length. We also recall details of
the trade-off between the length and optical losses for filter cavities, and
show the strict requirements for an ET low-frequency interferometer. Finally,
we present an alternative filter cavity design for an ET low-frequency
interferometer making use of a coupled cavity, and discuss the advantages of
the design in this context.

9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex