Development of a torsion balance for measuring charging noise

P. Campsie, G. D. Hammond, J. Hough, S. Rowan

Research output: Contribution to journalConference Contribution

1 Citation (Scopus)

Abstract

Noise due to surface charge on gravitational wave detector test masses could potentially become a limiting low frequency noise source in future detectors. It is therefore very important that the behavior of charging noise is experimentally verified so that accurate predictions of charging noise can be made. A torsion balance that is sensitive to small forces has been constructed at the University of Glasgow in order to measure charging noise. In this article the torsion balance apparatus being developed will be described in detail. There will also be a description of the calibration of the instrument and preliminary measurements that have been taken. These measurements show that it is possible to distinguish between the surface charge and polarisation charge on a silica sample. From this measurement it was possible to estimate the surface charge on the silica disc. The remainder of the article will discuss the improvements in sensitivity that have been made which will allow initial measurements of charging noise to begin.

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torsion
charging
silicon dioxide
detectors
gravitational waves
low frequencies
sensitivity
polarization
estimates
predictions

Keywords

  • torsion balance
  • charging noise
  • improvements in sensitivity
  • detection of gravitational waves

Cite this

Campsie, P. ; Hammond, G. D. ; Hough, J. ; Rowan, S. / Development of a torsion balance for measuring charging noise. In: Journal of Physics: Conference Series . 2012 ; Vol. 363. pp. 1-10.
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Development of a torsion balance for measuring charging noise. / Campsie, P.; Hammond, G. D.; Hough, J.; Rowan, S.

In: Journal of Physics: Conference Series , Vol. 363, 01.06.2012, p. 1-10.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Development of a torsion balance for measuring charging noise

AU - Campsie, P.

AU - Hammond, G. D.

AU - Hough, J.

AU - Rowan, S.

PY - 2012/6/1

Y1 - 2012/6/1

N2 - Noise due to surface charge on gravitational wave detector test masses could potentially become a limiting low frequency noise source in future detectors. It is therefore very important that the behavior of charging noise is experimentally verified so that accurate predictions of charging noise can be made. A torsion balance that is sensitive to small forces has been constructed at the University of Glasgow in order to measure charging noise. In this article the torsion balance apparatus being developed will be described in detail. There will also be a description of the calibration of the instrument and preliminary measurements that have been taken. These measurements show that it is possible to distinguish between the surface charge and polarisation charge on a silica sample. From this measurement it was possible to estimate the surface charge on the silica disc. The remainder of the article will discuss the improvements in sensitivity that have been made which will allow initial measurements of charging noise to begin.

AB - Noise due to surface charge on gravitational wave detector test masses could potentially become a limiting low frequency noise source in future detectors. It is therefore very important that the behavior of charging noise is experimentally verified so that accurate predictions of charging noise can be made. A torsion balance that is sensitive to small forces has been constructed at the University of Glasgow in order to measure charging noise. In this article the torsion balance apparatus being developed will be described in detail. There will also be a description of the calibration of the instrument and preliminary measurements that have been taken. These measurements show that it is possible to distinguish between the surface charge and polarisation charge on a silica sample. From this measurement it was possible to estimate the surface charge on the silica disc. The remainder of the article will discuss the improvements in sensitivity that have been made which will allow initial measurements of charging noise to begin.

KW - torsion balance

KW - charging noise

KW - improvements in sensitivity

KW - detection of gravitational waves

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DO - 10.1088/1742-6596/363/1/012006

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VL - 363

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JO - Journal of Physics: Conference Series

T2 - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

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