Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: LISA Pathfinder Performance Confirmed in an Open-Loop Configuration:
  Results from the Free-Fall Actuation Mode   We report on the results of the LISA Pathfinder (LPF) free-fall mode
experiment, in which the control force needed to compensate the quasistatic
differential force acting on two test masses is applied intermittently as a
series of "impulse" forces lasting a few seconds and separated by roughly 350 s
periods of true free fall. This represents an alternative to the normal LPF
mode of operation in which this balancing force is applied continuously, with
the advantage that the acceleration noise during free fall is measured in the
absence of the actuation force, thus eliminating associated noise and force
calibration errors. The differential acceleration noise measurement presented
here with the free-fall mode agrees with noise measured with the continuous
actuation scheme, representing an important and independent confirmation of the
LPF result. An additional measurement with larger actuation forces also shows
that the technique can be used to eliminate actuation noise when this is a
dominant factor.

29
The categories of this paper are: funct-an
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom